JP6521800B2 - Cogeneration system - Google Patents

Description

  According to the present invention, a power generation unit interconnected with a single-phase three-wire commercial power supply and a pair of current detection units separately installed on each of U-phase and V-phase lines of the commercial power supply An operation control unit for controlling is provided, and in a state where the operation control unit stops the operation of the power generation unit, electric power is supplied from the U phase side electric load to which electric power is supplied from the U phase line and the V phase line The present invention relates to a combined heat and power supply system configured to execute a diagnosis process of selectively operating the supplied V-phase electrical load to diagnose the installation state of the pair of current detection units.

The cogeneration system is configured such that the operation control unit executes a diagnosis process to diagnose the installation state of the pair of current detection units.
That is, for example, the state in which each of the pair of current detection units detects the current flowing from the commercial power supply side toward the load as positive and detects the current flowing from the power generation unit to the commercial power as negative In this case, if the mounting direction of the pair of current detection units is reversed, plus and minus will be reversed, it is diagnosed whether the mounting direction of the pair of current detection units is installed properly. Also, a pair of current detection units are properly installed on the U-phase line and the V-phase line, and the current detection unit for detecting the current of the U-phase line detects the current of the U-phase line as appropriate, and V It is possible to diagnose whether or not the current detection unit that detects the current of the phase line detects the current of the V-phase line as appropriate.

  As a conventional example of such a combined heat and power supply system, the power generation unit is provided with U-phase heater means connected to the U-phase wire and V-phase heater means connected to the V-phase wire as heater means for excessive power consumption. Using U phase heater means as U phase side electric load and V phase heater means as V phase side electric load by using reference.).

That is, in Patent Document 1, electric power generated in the power generation unit flows to the commercial power supply side based on detection information of a pair of current detection units installed on each of the U-phase line and the V-phase line of the commercial power supply. In order to avoid so-called reverse power flow, U-phase heater means and V-phase heater means as heater means for surplus power consumption are operated, and in diagnostic processing, as heater means for surplus power consumption It is described that U-phase heater means and V-phase heater means are used as U-phase electrical load and V-phase electrical load.
Patent Document 1 describes that the U-phase heater means and the V-phase heater means are each composed of three heaters, and in the diagnostic process, the U-phase heater means and the V-phase heater means are U-phase When used as a side electrical load or a V-phase electrical load, it is described that at least one or more heaters are operated.

Incidentally, although not described in Patent Document 1, generally, the detection information of the pair of current detection units is also used to obtain the power consumption using the power of the commercial power supply, and the power consumption thus obtained However, it is displayed on the remote control etc. which instruct | indicate the operation information of a cogeneration system.
Then, the amount of power consumption is obtained as a value obtained by adding the integrated value of the product of the voltage of the U phase line and the current of the U phase line and the integrated value of the product of the voltage of the V phase line and the current of the V phase line. Therefore, the current detection unit that detects the current of the U-phase line detects the current of the U-phase line as appropriate, and the current detection unit that detects the current of the V-phase line appropriately Need to detect.

  In Patent Document 1, instead of operating the U-phase heater means and the V-phase heater means, the amount of power supplied to the U-phase line and the V-phase line is varied while increasing or decreasing the generated power of the power generation unit. Although it is also described to detect whether the pair of current detection units are properly installed on the U-phase line and the V-phase line, the power generation of the power generation unit is varied for diagnostic processing. There is a waste that must be done.

Further, in Patent Document 1, the power generation unit is configured to include a generator driven by an engine, but the power generation unit is a reforming unit that reforms fuel gas such as city gas; In some cases, the fuel cell may be configured to include a fuel cell that generates electric power using the hydrogen-containing gas from the reforming unit as a fuel (for example, see Patent Document 2).
Incidentally, also in Patent Document 2, as in Patent Document 1, the provision of an electric heater as a heater unit for surplus power consumption is described.

Unexamined-Japanese-Patent No. 2002-286785 JP, 2005-69667, A

  In Patent Document 1, when using U-phase heater means and V-phase heater means as U-phase side electric load or V-phase side electric load, U-phase side electric load or V-phase side electric load is a load of a certain size. Therefore, the power consumption for determining the installation state of the pair of current detection units may be increased.

  That is, when the U-phase electrical load or the V-phase electrical load is a load of a certain size, a large current flows in a case where a large power consumption electrical device is connected to the commercial power supply. Since the range in which the current pulsates due to disturbance becomes large, when the U-phase side electrical load and the V-phase side electrical load are small, the small current changes caused by the small load acting on the pair of current detection portions It becomes difficult to detect by any current value of.

  Therefore, when the U-phase electrical load or the V-phase electrical load is a load of a certain size, in the diagnosis process, the U-phase electrical load and the V-phase electrical load are regarded as large loads, and the large loads are used. The change in the current value generated by the action is detected by the current value of either of the pair of current detection units.

  However, in this case, since the U-phase side electrical load and the V-phase side electrical load are always made to be large loads, a state in which a smaller current flows when a small power consumption electrical device is connected to the commercial power supply Since the range in which the current pulsates due to the disturbance decreases, the U-phase side electrical load and the V-phase side electrical load, even if acting as a small load, have a small current value corresponding to the applied load. Although the change can be detected by the current value of either of the pair of current detection units, there is a disadvantage that the U-phase electrical load and the V-phase electrical load act as a large load.

  That is, in the diagnosis processing, when the U-phase side electrical load and the V-phase side electrical load are set to a constant large load, a smaller current flows when the electric device with low power consumption is connected to the commercial power supply. Also in this case, a large load acts as the U-phase side electrical load and the V-phase side electrical load, so that there is a problem that the power consumption for the diagnostic process becomes large.

  When the heater means connected to the U-phase and the heater means connected to the V-phase are used as the U-phase side electric load and the V-phase side electric load, the hot water is unnecessarily heated. There is also a possibility that the equipment may be unnecessarily heated and thermally damaged.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a combined heat and power supply system capable of performing a diagnosis process for diagnosing the installation state of a pair of current detection units while reducing power consumption. It is.

The cogeneration system according to the present invention is
A single-phase three-wire commercial power supply and a power generation unit connected to the grid,
A pair of current detection units separately installed on each of the U-phase line and the V-phase line of the commercial power supply;
An operation control unit for controlling the operation is provided.
The operation control unit selects a U-phase electrical load to which power is supplied from the U-phase line and a V-phase electrical load to which power is supplied from the V-phase line while the operation of the power generation unit is stopped A combined heat and power supply system configured to execute a diagnosis process that diagnoses the installation state of the pair of current detection units by acting
In the diagnosis process, the operation control unit
Before the U-phase side electrical load and the V-phase side electrical load are selectively applied, based on the current value detected by each of the pair of current detection units, the amount of power supplied from the commercial power supply The corresponding power supply index value is obtained, and the U-phase electrical load and the V-phase electrical load are set to be larger as the power supply index value is larger.

According to the above-mentioned characteristic configuration, in the diagnostic processing, before the U-phase side electrical load and the V-phase side electrical load are selectively applied, the commercial power supply is performed based on the current value detected by each of the pair of current detection units. The power supply index value corresponding to the power supply amount from
Then, the U-phase electrical load and the V-phase electrical load are selectively operated in the form of increasing as the power supply index value increases, and the installation state of the pair of current detection units is diagnosed.

  That is, when the power supply index value shows a small value, that is, when a small current flows in the commercial power supply, the range in which the current pulsates due to the disturbance is small, so the U phase side electric load to be operated And a small change in the current value generated by applying the small U-phase electrical load and the V-phase electrical load even if the V-phase electrical load is small Therefore, the U-phase electrical load and the V-phase electrical load are set to relatively small loads.

  In addition, when the power supply index value indicates a large value, that is, when a large current flows in the commercial power supply, the range in which the current pulsates due to a disturbance becomes large, and thus the U-phase side electrical load to be operated Assuming that the V-phase side electrical load is a small load, a change in the small current value generated by applying the U-phase side electrical load and the V-phase side electrical load is detected from the current value of either of the pair of current detectors I can not do it. Therefore, in such a case, the U-phase electrical load and the V-phase electrical load to be operated are set to relatively large loads.

  As described above, the U-phase side electrical load and the V-phase side electrical load are increased as the power supply index value is larger. Therefore, when the power supply index value is smaller, the U-phase side electrical load and the V-phase side to be operated Since the electrical load can be reduced, the U-phase electrical load and the V-phase electrical load to be selectively applied can be reduced when an electrical device with low power consumption is connected to the commercial power supply. As a result, it is possible to reduce the power consumption in the diagnosis process.

  Therefore, according to the present feature configuration, the diagnostic processing is performed to diagnose the installation state of the pair of current detection portions while reducing the power consumption by the U phase side electrical load and the V phase side electrical load applied in the diagnostic processing. be able to.

A further feature of the cogeneration system according to the present invention is
The operation control unit integrates current values detected by each of the pair of current detection units before selectively applying the U-phase side electric load and the V-phase side electric load in the diagnosis process. The integrated current value is determined, and the power supply index value is determined based on the integrated current value.

According to the above feature configuration, the integrated current value obtained by integrating the current values detected by each of the pair of current detection units before selectively applying the U-phase side electrical load and the V-phase side electrical load in the diagnostic processing Since the power supply index value is determined based on the integrated current value, the current value of the commercial power supply before the U-phase side electrical load and the V-phase side electrical load are selectively applied, for example, a pair of current detection It is possible to detect appropriately while excluding the influence of the disturbance, as compared with the case of detecting by the instantaneous value of the current value detected by each of the units.
Therefore, based on the integrated current value appropriately detected while excluding the influence of the disturbance, the power supply index value serving as an index for determining the magnitude of the U-phase side electrical load and the V-phase side electrical load to be applied in the diagnostic processing. It can be asked.

A further feature of the cogeneration system according to the present invention is
The operation control unit integrates current values detected by each of the pair of current detection units when the U-phase side electric load and the V-phase side electric load are selectively applied in the diagnosis process. The integrated current value is determined, and the installation state of the pair of current detection units is diagnosed based on the integrated current value.

According to the above feature configuration, the U-phase electrical load and the V-phase electrical load are selectively acted on the basis of the integrated current value obtained by integrating the current values detected by each of the pair of current detection units in the diagnosis processing It detects the change in current value that occurs when it is turned on.
Therefore, a change in the current value generated when the U-phase side electrical load and the V-phase side electrical load are selectively applied is detected, for example, by the instantaneous value of the current value detected by each of the pair of current detection units. It is possible to detect appropriately while excluding the influence of disturbance rather than the case of

A further feature of the cogeneration system according to the present invention is
When the operation control unit causes the U-phase side electrical load and the V-phase side electrical load to selectively act in the diagnosis process, a change in the current value occurs in either of the pair of current detection units. If not detected, it is configured to determine that it is an abnormal state.

According to the above-mentioned feature configuration, in the diagnosis processing, when a change in the current value caused by applying the U-phase side electrical load and the V-phase side electrical load is not detected by any of the pair of current detection units It determines that it is a state.
Thus, for example, when it is determined that an abnormal state is present, the user can be notified by an alarm or the like. Then, the user can perform, for example, as an electrical device connected to a commercial power source, a process such as confirming whether an electrical device having a large power consumption unsuitable for performing a diagnostic process is connected.

Schematic diagram of cogeneration system Electrical diagram of cogeneration system Diagram showing the relationship between the power supply index value and U-phase electrical load and V-phase electrical load Flow chart showing diagnostic processing Flow chart showing diagnostic processing Flow chart showing test processing according to the second embodiment

First Embodiment
Hereinafter, a cogeneration system of a first embodiment according to the present invention will be described based on the drawings.
(Overall configuration of cogeneration unit)
As shown in FIG. 1, the heat and power supply system includes the heat and power supply unit H including a power generation unit Ha and a heat source unit Hb as an exhaust heat recovery and consumption unit, and the heat source unit Hb includes exhaust heat of the power generation unit Ha. A hot water storage tank 1 for storing hot and cold water collected and an auxiliary heat source device 2 for burning using a fuel gas such as city gas are provided.

The power generation unit Ha is equipped with a fuel cell 4 that generates electric power using hydrogen gas (hydrogen-containing gas) supplied through the hydrogen gas supply path 3 from the reforming unit K that steam-reforms the raw material gas. A feed on / off valve 3A is provided to intermittently feed the source gas to the reforming unit K.
The fuel cell 4 is configured by stacking cells including a fuel electrode 4n and an oxygen electrode 4s, and cooling water flows between the fuel electrode 4n and the oxygen electrode 4s of adjacent cells. A passing portion 4 d is provided.

  The reforming unit K is supplied with city gas and the like as a raw material gas, and although not shown, the reforming unit K has a desulfurizer that desulfurizes the supplied raw material gas, and The desulfurization gas from the boiler is reformed by steam to form a hydrogen-containing gas, and the carbon monoxide contained in the reformed gas reformed by the reformer is converted to carbon dioxide A shift converter to be processed and a carbon monoxide selective oxidizer to selectively oxidize carbon monoxide contained in a shift gas transformed by the shift converter are provided. The hydrogen gas (hydrogen-containing gas) generated by the carbon monoxide selective oxidizer is supplied to the fuel cell 4 through the hydrogen gas supply passage 3 as described above.

Cooling water circulation passage 5A for recovering heat generated by the fuel cell 4 with cooling water, hot water circulation passage 5B for circulating hot water through power generation unit Ha and heat source unit Hb, and cooling water for circulating cooling water circulation passage 5A And a heat exchange unit 5C that exchanges heat with the hot water circulating in the hot water circulation path 5B.
A cooling water circulation pump Pa and a cooling water storage tank Q are provided in the cooling water circulation passage 5A, and surplus water of the electric power generated by the hot water circulation pump Pb and the fuel cell 4 is converted to heat and collected in the hot water circulation passage 5B. A surplus power heater unit G is provided.

  Then, the hot water of the hot water circulating passage 5B that circulates the hot and cold water between the power generation unit Ha and the heat source unit Hb is heated by the cooling water circulating through the cooling water circulation passage 5A, and the exhaust heat of the power generating unit Ha is the heat source unit Hb. Heat source unit Hb is configured to perform general hot water supply, hot water supply hot water supply, heating operation, and reheating operation, and operates auxiliary heat source unit 2 when the amount of heat is insufficient. Are configured as described above, and the details thereof will be described later.

An operation control unit 6 that controls the operation of the power generation unit Ha is provided on the power output side of the fuel cell 4.
The operation control unit 6 includes an inverter for grid connection, and is configured to set the generated power of the fuel cell 4 to the same voltage and the same frequency as the received power received from the commercial power source 7.
Further, as will be described in detail later, the operation control unit 6 consumes the surplus power heater unit G so as to consume the surplus power of the power generated by the fuel cell 4 by the surplus power heater unit G so as not to generate reverse power flow. It is configured to regulate the power.

  The commercial power source 7 is a single-phase three-wire 100/200 V. A received power supply line 9 is connected to the distribution board 8 to which the commercial power supply 7 is connected, and power from the commercial power supply 7 is transmitted via the received power supply line 9 to an electrical load 10 such as a television, a refrigerator, or a washing machine. Configured to be supplied to

  In addition, the power generation unit Ha is connected to the distribution board 8, and the generated power from the fuel cell 4 is configured to be supplied to the electric load 10 via the received power supply line 9.

The heat source unit Hb is provided with a terminal side control unit 11 for controlling the operation of the heat source unit Hb, and the thermoelectric control unit C for controlling the operation of the cogeneration unit H includes the operation control unit 6 and the terminal side control unit 11 And consists of
The operation control unit 6 and the terminal side control unit 11 are connected by a communication line L and configured to be able to communicate various information, and start operation to the operation control unit 6 and the terminal side control unit 11 A remote control R for instructing various information such as a command and an operation stop command is provided in a form of being connected to the communication line L.

(About electrical system)
As shown in FIG. 2, the U-phase line U, the V-phase line V, and the neutral line O of the commercial power supply 7 are drawn into the distribution board 8.
Inside the distribution board 8, a limiter (current limiter) 12 for limiting the load current to a contracted set value or less, a master breaker (leakage breaker) 13, and a plurality of branch breakers for connecting the received power supply line 9 described above 14 and a linkage breaker 15 for connecting the operation control unit 6 are provided.
In addition, although the form which supplies the electric power of 100V with respect to the electric load 10 is illustrated in FIG. 2, you may make it supply the electric power of 200V with respect to the electric load 10 as needed.

The power generation unit Ha is provided with a power supply terminal block 16 connected to the operation control unit 6 by the internal wiring N, and the power supply terminal block 16 is connected to the linkage breaker 15 by the external wiring M.
The internal wiring N is provided with a U-phase extension Nu, a V-phase extension Nv, and a neutral extension No. The external wiring M includes a U-phase outer wire Mu, a V-phase outer wire Mv and a neutral outer wire Mo. Is equipped.

In the distribution board 8, a first current detection unit D1 and a second current detection unit D2 each separately detecting the current flowing through the U-phase line U and the V-phase line V of the commercial power supply 7 It is installed corresponding to the line V.
Incidentally, in the present embodiment, the first current detection unit D1 and the second current detection unit D2 are disposed between the main breaker 13 and the branch breaker 14, for example, the first current detection unit D1 and the The installation location of the first current detection unit D1 and the second current detection unit D2 can be changed, such as installing the second current detection unit D2 closer to the commercial power source 7 than the limiter 12.

The operation control unit 6 is connected to a U-phase signal line Su and a V-phase signal line Sv.
The first current detection unit D1 is connected to the U-phase signal line Su, and the second current detection unit D2 is connected to the V-phase signal line Sv.
Therefore, the first current detection unit D1 is installed to detect the current flowing to the U phase line U, and the second current detection unit D2 is installed to detect the current flowing to the V phase line V.
The first current detection unit D1 and the second current detection unit D2 are collectively referred to as a pair of current detection units D.

  The pair of current detection units D is configured using an alternating current sensor of a current transformer type, and in the present embodiment, when the installation direction is appropriate, the commercial power source 7 supplies the electric load 10 When a current flows in the direction, a positive voltage signal is output, and when a current flows in the direction toward the commercial power supply 7, a negative voltage signal is output.

  Then, when installing the heat and power supply system at the installation location such as home, the first current detection unit D1 connected to the signal wire Su for U phase is installed on the U phase wire U in a proper installation direction, The second current detection unit D2 connected to the signal line Sv for a signal is installed on the V-phase line V in a proper installation direction. However, in the present embodiment, the operation control unit 6 includes a pair of current detection units D It is comprised so that the diagnostic process which diagnoses whether the installation state of is appropriate may be performed, and the detail is mentioned later.

  The heat and power supply system according to the present embodiment is grid-connected to the commercial power supply 7 so that no reverse power flow occurs, and the detection information of the first current detection unit D1 and the second current detection unit D2 is a surplus power heater The information is used as information for adjusting the power consumption of part G, and additionally used for determining the amount of use of the power of the commercial power source 7 (power consumption). In addition, the calculated power consumption will be displayed on the remote control R which instructs the operation information of the cogeneration unit H.

  By the way, the amount of power consumption is calculated by adding the integrated value of the product of the voltage of U-phase line U and the current of U-phase line U and the integrated value of the product of the voltage of V-phase line V and the current of V-phase line V Therefore, the pair of current detection units D need to appropriately detect the current of the U-phase line U and the current of the V-phase line V.

Although not shown, the operation control unit 6 is provided with a U-phase voltage detection unit that detects the voltage of the U-phase line U and a V-phase voltage detection unit that detects the voltage of the V-phase line V.
Then, based on the detection information of the U-phase voltage detection unit and the V-phase voltage detection unit and the detection information of the pair of current detection units D, the arithmetic processing unit (CPU) provided in the operation control unit 6 described above The calculated power consumption is determined, and the calculated power consumption is displayed on the remote control R.

(Composition of heat source part)
As shown in FIG. 1, in addition to the hot water storage tank 1 and the auxiliary heat source machine 2 described above, the heat source unit Hb includes the multifunctional circulation pump 20, the heating circulation pump 21, the bath following circulation pump 22, exhaust heat recovery A heat exchanger 23, a heating heat exchanger 24, and a bath follow-up heat exchanger 25 are provided.
Further, the heat source section Hb is provided with a hot water supply mixing valve 26, a hot water filling valve 27, a heating circuit supply valve 28, a heat storage switching valve 29, a circulation on-off valve 30, a three-way valve 31, and a circulation amount adjustment valve 32. There is.

A tank upper passage 33 is provided at the top of the hot water storage tank 1, and a tank lower passage 34 is provided at the bottom of the hot water storage tank 1. The tank upper passage 33 is connected to the hot water supply mixing valve 26, and the tank lower passage 34 is connected to the three-way valve 31.
The water supply passage 35 for supplying hot and cold water from a water supply source such as tap water is branched into a first water supply passage 35 a connected to the hot water supply mixing valve 26 and a second water supply passage 35 b connected to the bottom of the hot water storage tank 1. It is done.

The multifunctional circulation path 36 in which the multifunctional circulation pump 20 is disposed includes the auxiliary heat source device 2, the circulation amount adjustment valve 32, the circulation on-off valve 30, the heating heat exchanger 24, the bath follow-up heat exchanger 25, and the three-way valve 31 and provided through the exhaust heat recovery heat exchanger 23.
A hot water / water circulation passage 5B for circulating hot / cold water between the power generation unit Ha and the heat source unit Hb is connected to the exhaust heat recovery heat exchanger 23, and the exhaust heat recovery heat exchanger 23 The hot and cold water circulating in the functional circulation path 36 is configured to be heated.

The heating heat exchanger 24 and the bath follow-up heat exchanger 25 are disposed in series in the multi-functional circulation path 36, and the heating on-off heat exchanger 24 and the bath follow-up heat are arranged by opening and closing the circulation on-off valve 30. The flow of hot and cold water through the exchanger 25 is interrupted.
A heat storage path 37 connecting the downstream portion of the auxiliary heat source unit 2 in the multifunctional circulation path 36 and the tank upper path 33 is provided, and the heat storage switching valve 29 is provided in the heat storage path 37.

A heating circulation path 38 for circulating a heating heat medium to a terminal T for heating such as a floor heating apparatus is provided in a state of passing through a heating heat exchanger 24, and a heating circulation pump 21 is for heating It is provided in the circulation passage 38.
The heating circuit 38 is provided with a short circuit 38a and an expansion tank 39 for short circuiting the heating heat medium. In addition, a supply passage 40 for supplying hot water from the water supply passage 35 to the expansion tank 39 is provided, and a heating circuit supply valve 28 is provided on the supply passage 40.

A bath circulation path 42 connected to the bathtub 41 is provided in a state of passing through the bath trace heat exchanger 25, and a bath trace circulation pump 22 is provided in the bath circulation path 42.
A hot water supply passage 43 extended from the hot water supply mixing valve 26 is provided in a state of being connected to a general hot water supply tap (not shown), and connects an intermediate position of the hot water supply passage 43 and an intermediate position of the bath circulation passage 42 A bathing passage 44 is provided, and a bathing valve 27 is provided in the bathing passage 44.

(Outline of operation of heat source unit)
The heat source unit Hb closes the circulation on-off valve 30, opens the heat storage switching valve 29, and switches the three-way valve 31 to the state where the lower tank passage 34 and the multifunctional circulation passage 36 communicate with each other. By operating 20, it is comprised so that a hot water storage driving | operation may be performed.

That is, the hot and cold water extracted from the tank lower passage 34 is allowed to flow through the three-way valve 31 to the multifunctional circulation passage 36 and heated by the exhaust heat recovery heat exchanger 23, and the heated hot and cold water is passed through the heat storage passage 37. The hot water storage operation is performed while returning to the hot water storage tank 1.
At this time, the temperature of the stored hot and cold water is adjusted to an appropriate temperature (for example, 70 ° C.) by adjusting the flow rate of the hot and cold water by the circulation amount adjusting valve 32.

  Also, open the circulation on-off valve 30, close the heat storage switching valve 29, and switch the three-way valve 31 to a state in which the lower tank passage 34 and the multifunctional circulation passage 36 do not communicate with each other to operate the multifunctional circulation pump 20. The heating operation for supplying the heat medium to the terminal T for heating through the heating circulation path 38 while circulating hot and cold water through the multi-function circulation path 36, and heating while circulating bath water through the bath circulation path 57 It is configured to perform bath remembrance operation.

  Furthermore, the heat source unit Hb mixes the hot water from the tank upper path 33 and the hot water from the first water supply path 35a and divides the hot water of the hot water supply path 43 into the hot water spreading path 44. It is configured to perform hot-water supply and hot-water supply operation to supply the bath tub 41 through the bath circulation path 42.

  In each of the heating operation and the bath remembrance operation, basically, hot water is circulated through the multifunctional circulation passage 36 by the operation of the multifunctional circulation pump 20, and the exhaust heat recovery heat exchanger 23 It is performed by heating the hot and cold water circulating in the multifunctional circulation path 36 by the exhaust heat, but when the exhaust heat of the power generation unit Ha is insufficient, the auxiliary heat source machine 2 is operated to circulate the hot and cold water circulating in the multifunctional circulation path 36 Will heat up.

Basically, each of the general hot water supply operation and the hot water supply hot water supply operation is performed using the hot and cold water of the hot water storage tank 1, but when the heat storage amount of the hot water storage tank 1 is insufficient, the auxiliary heat source machine 2 It is configured to be operated by combustion.
That is, in the state where the multifunctional circulation pump 20 is operated, the hot and cold water allowed to flow to the multifunctional circulation passage 36 from the tank lower passage 34 via the three-way valve 31 is heated by the auxiliary heat source unit 2 and heated It is configured to be able to flow to the tank upper passage 33 via the heat storage passage 37.

(Details of auxiliary heat source machine)
As shown in FIG. 1, the auxiliary heat source unit 2 burns in a finned tube heat exchange section 2A through which hot and cold water flows, a heating burner 2B which heats the finned tube heat exchange section 2A, and a heating burner 2B. It is comprised so that the ventilation fan 2C which supplies air may be provided.
And heat source machine control part 2D (refer to Drawing 2) which controls operation of auxiliary heat source machine 2 is constituted so that operation of burner 2B for heating and ventilation fan 2C may be controlled.

  That is, in the heat source controller 2D, the water flow sensor (not shown) detects that the water flow of the hot and cold water flowing through the finned tube heat exchange unit 2A is equal to or greater than the set water flow, and the water temperature sensor When it is detected by (not shown) that the temperature of the hot and cold water flowing through the finned tube heat exchange section 2A is lower than a set target temperature (for example, 70.degree. C.), the operation of the heating burner 2B and the blower fan 2C. The heating amount of the heating burner 2B is adjusted so as to bring the temperature of the heated water and water to a set target temperature (for example, 70.degree. C.).

  By the way, although illustration is omitted, the terminal side control unit 11 and the heat source unit control unit 2D are communicably connected by a communication line, and the terminal side control unit 11 performs heating operation to the heat source unit control unit 2D. The system is configured to command various information such as command information for commanding permission of.

(About prevention of freezing of the power generation unit)
As shown in FIG. 1, the power generation unit Ha is provided with a first electric heater 46 for heating the cooling water circulation path 5A and a plurality of second electric heaters 47 for heating the hot water circulation path 5B.
Then, when any of the detection temperatures of a plurality of temperature detection sensors (not shown) for detecting the temperatures of the cooling water circulation passage 5A and the hot water circulation passage 5B falls below the antifreeze temperature (for example, 5 ° C.), the operation control unit 6 However, by operating the cooling water circulation pump Pa and the hot water circulation pump Pb and operating the first electric heater 46 and the second electric heater 47, the cooling water circulation passage 5A and the hot water circulation passage 5B are heated. It is done.

  Thereafter, all temperatures detected by a plurality of temperature detection sensors (not shown) for detecting the temperatures of the cooling water circulation passage 5A and the hot water circulation passage 5B are higher than the set termination temperature (eg, 10 ° C.) higher than the antifreeze temperature. Then, the operation control unit 6 is configured to stop the operation of the cooling water circulation pump Pa and the hot water circulation pump Pb, and to stop the operation of the first electric heater 46 and the second electric heater 47.

(About freeze prevention of heat source part)
As shown in FIG. 1, in the heat source section Hb, a plurality of first heating paths 35, a first water supply path 35a, a second water supply path 35b, a multifunctional circulation path 36, a supply path 40 and a hot water supply path 43 are heated. Three electric heaters 48 are provided.
In addition, the auxiliary heat source unit 2 is provided with a fourth electric heater 49 for heating a pipe line near the finned tube heat exchange section 2A.

  Then, the temperatures of the plurality of temperature detection sensors (not shown) for detecting the temperatures of the water supply passage 35, the first water supply passage 35a, the second water supply passage 35b, the multifunctional circulation passage 36, the supply passage 40 and the hot water supply passage 43 When one of the temperatures falls below the freezing prevention temperature (for example, 5 ° C.), the terminal-side control unit 11 operates the third electric heater 48 to supply the water supply passage 35, the first water supply passage 35a, and the second water supply passage 35b, The multi-function circulation passage 36, the supply passage 40 and the hot water supply passage 43 are heated.

  Thereafter, the temperatures of the plurality of temperature detection sensors (not shown) for detecting the temperatures of the water supply passage 35, the first water supply passage 35a, the second water supply passage 35b, the multifunctional circulation passage 36, the supply passage 40 and the hot water supply passage 43 The terminal-side control unit 11 is configured to stop the operation of the third electric heater 48 when all become equal to or higher than the setting end temperature (for example, 10 ° C.) higher than the antifreeze temperature (for example, 5 ° C.) There is.

  When the detection temperature of the temperature detection sensor (not shown) for detecting the temperature of the fin-tube type heat exchange unit 2A in the auxiliary heat source unit 2 or the pipe line portion near it becomes equal to or lower than the antifreeze temperature (for example, 5 ° C.) The heat source controller 2D is configured to operate the fourth electric heater 49 to raise the temperature of the fin-tube type heat exchange section 2A and the pipe section in the vicinity thereof.

  Thereafter, the detection end temperature (for example, 5 ° C.) of the temperature detection sensor (not shown) for detecting the temperature of the fin-tube type heat exchange unit 2A or a pipe line portion near the same is higher than the termination temperature (for example, 5 ° C.) For example, at 10 ° C. or more, the heat source control unit 2D is configured to stop the operation of the fourth electric heater 49.

(Details of drive configuration of power generation unit)
As shown in FIG. 2, the power generation unit Ha includes a first drive circuit unit 51 for driving the cooling water circulation pump Pa, a second drive circuit unit 52 for driving the hot water circulation pump Pb, and a first electric heater 46. A third drive circuit unit 53 for driving the second electric heater 47 and a fourth drive circuit unit 54 for driving the second electric heater 47 are provided.

  Further, the power generation unit Ha is provided with the above-described surplus power heater unit G. In this surplus power heater G, a first surplus power heater drive 61 to a sixth surplus power heater drive 66 for driving each of the first surplus power heater F1 to the sixth surplus power heater F6 as a surplus power heater are provided. It is provided.

  In the present embodiment, the first surplus power heater drive unit 61 to the third surplus power heater drive unit 63, the first drive circuit unit 51, and the third drive circuit unit 53 are the U-phase extension Nu and the middle in the internal wiring N. The fourth surplus power heater drive unit 64 to the sixth surplus power heater drive unit 66, the second drive circuit unit 52, and the fourth drive circuit unit 54 are connected to the internal extension No. It is connected to the extension Nv and the extension No for neutral.

  Then, a first drive switch 51S for interrupting the supply of power separately for each of the first drive circuit unit 51, the second drive circuit unit 52, the third drive circuit unit 53, and the fourth drive circuit unit 54, The second drive switch 52S, the third drive switch 53S, and the fourth drive switch 54S are provided, and the first drive switch 51S to the fourth drive switch 54S are intermittently operated by the command of the operation control unit 6 Is configured. In addition, corresponding to each of the first surplus power heater driving unit 61 to the sixth surplus power heater driving unit 66, the first surplus power heater switch 61S to the sixth surplus power heater switch 66S for interrupting the power supply separately are provided. It is comprised so that it may be intermittently operated by the instruction | command of the operation control part 6. FIG.

  Therefore, the operation control unit 6 intermittently operates the first drive switch 51S to the fourth drive switch 54S to set each of the cooling water circulation pump Pa, the hot water circulation pump Pb, the first electric heater 46, and the second electric heater 47. It is configured to be able to switch between an operating state and an operating state. Further, the operation control unit 6 operates the first surplus power heater F1 to the sixth surplus power heater F6 by operating the first surplus power heater switch 61S to the sixth surplus power heater switch 66S intermittently. It is comprised so that it can switch to a halt condition.

  Incidentally, in order to prevent reverse power flow from the power generation unit Ha to the commercial power source 7, the operation control unit 6 determines the magnitude of the surplus power of the power generated by the fuel cell 4 based on the detection information of the pair of current detection units D. The first surplus power heater switch 61S to the sixth surplus power heater switch 66S are configured to be intermittently operated so that the power consumption of the surplus power heater G becomes larger as the size increases.

Further, the power generation unit Ha is provided with a pair of first terminal block 55A and second terminal block 55B, and the terminal-side control unit of the heat source unit Hb with respect to these first terminal block 55A and second terminal block 55B. A heat source unit controller 2D of the auxiliary heat source unit 11 and the auxiliary heat source unit 2 are configured to be connectable.
Then, by connecting the first terminal block 55A to the U-phase extension Nu and the neutral extension No in the internal wiring N, a U-phase connection portion for outputting the power from the U-phase wire U to the outside is provided. V-phase side outputting electric power from V-phase line V to the outside by being configured and connected to second-line terminal block 55B to V-phase extension Nv and neutral extension No in internal wiring N It is comprised as a connection part.

U-phase side switch 56A as U-phase side interrupting portion for connecting and disconnecting the first terminal block 55A and the internal wiring N, and V-phase side connecting portion for connecting the second terminal block 55B and the internal wiring N The V-phase side switch 56B is provided as the U-phase side switch 56B, and the U-phase side switch 56A and the V-phase side switch 56B are configured to be intermittently operated by the operation control unit 6.
That is, the first terminal block 55A as the U-phase side connection portion is configured to be switchable between the output action state and the output stop state by the U-phase side switch 56A. Similarly, the second terminal block 55A as the V-phase side connection portion The terminal block 55B is configured to be switchable between the output operation state and the output stop state by the V-phase side switch 56B.

The terminal-side control unit 11 and the heat source control unit 2D are configured to be connectable to any of the first terminal block 55A and the second terminal block 55B, but the basic connection state is as shown in FIG. The side control unit 11 is connected to the first terminal block 55A, and the heat source control unit 2D is connected to the second terminal block 55B.
Incidentally, the terminal side control unit 11 and the heat source device control unit 2D are connected to the first terminal block 55A and the second terminal block 55B via the first relay line 57A and the second relay line 57B.

  Further, in the present embodiment, the operation control unit 6 and the heat source device control unit 2D are connected by the communication line 58, and the operation control unit 6 performs the diagnostic processing in the second embodiment described later. The heat source controller 2D is configured to command command information for operating the blower fan 2C and the fourth electric heater 49.

(Details of heat source section)
As shown in FIG. 2, the heat source unit Hb is a main processing unit provided with a multifunctional circulation pump 20, a heating circulation pump 21, a bath follow-up circulation pump 22, and a third electric heater 48 as a main body side electric device E1. The auxiliary heat source unit 2 including B1, the blower fan 2C and the fourth electric heater 49 as the auxiliary electric device E2 is configured as the auxiliary processing unit B2.
The main-body-side electrical device E1 and the auxiliary-side electrical device E2 are collectively referred to as an electrical device Eb provided in the heat source section Hb.

Also, a terminal side control unit with which the main processing unit B1 communicates with the operation control unit 6 through the communication line L in a power supply state by connection with either the first terminal block 55A or the second terminal block 55B. 11 is configured to be provided.
Furthermore, the heat source device control unit with which the auxiliary processing unit B2 communicates with the operation control unit 6 via the communication line 58 in the power supply state by connection with either the first terminal block 55A or the second terminal block 55B. It is comprised in the form provided with 2D.

That is, the main processing unit B1 of the heat source Hb is connected to one of the first terminal block 55A and the second terminal block 55B and includes the main unit-side electric device E1 as an electric load, and additionally, operation control is performed in the power supply state. The terminal side control unit 11 is configured to communicate with the unit 6.
In addition, the auxiliary processing unit B2 of the heat source unit Hb is connected to the other of the first terminal block 55A and the second terminal block 55B and includes the auxiliary electric device E2 as an electric load, and additionally, operation control is performed in the power supply state. It is comprised so that the heat-source-apparatus control part 2D which communicates between the parts 6 may be provided.

  Incidentally, the terminal-side control unit 11 is connected to either the first terminal block 55A or the second terminal block 55B via the first relay line 57A, and the heat source device control unit 2D is connected via the second relay line 57B. It will be connected to either the first terminal block 55A or the second terminal block 55B.

(Control operation of operation control unit)
Operation control unit 6 selectively selects U-phase electrical load Eu connected to U-phase wire U and V-phase electrical load Ev connected to V-phase wire V while power generation of fuel cell 4 is stopped. It is configured to execute a diagnosis process for diagnosing the installation state of the pair of current detection units D.

  In this diagnostic processing, before the U-phase side electrical load Eu and the V-phase side electrical load Ev are selectively applied, the commercial power supply 7 is used based on the current values detected by each of the pair of current detection units D. The power supply index value W corresponding to the power supply amount of power is determined, and the U-phase electrical load Eu and the V-phase electrical load Ev are increased as the power supply index value W is larger (see FIG. 3).

  That is, before operation control unit 6 selectively applies U-phase electrical load Eu and V-phase electrical load Ev, power supply is performed based on the current value detected by each of the pair of current detection units D. It is configured to determine the index value W. Specifically, an integrated current value obtained by integrating the current values detected in each of the pair of current detection units D is calculated, and the power supply index value W becomes larger as the absolute value of the integrated current value becomes larger. It is done. In the present embodiment, the larger one of the integrated current value obtained by integrating the current values detected by the first current detection unit D1 and the integrated current value obtained by integrating the current values detected by the second current detection unit D2. The absolute value of the integrated current value is calculated as the power supply index value W.

  Although an instantaneous value can be used as a current value for obtaining the power supply index value W, in the present embodiment, the influence of disturbance is excluded by using an integrated value of a set time (for example, 1 second). The current value for determining the power supply index value W can be detected.

  Then, as shown in FIG. 3, the U-phase electrical load Eu and the V-phase electrical load Ev to be operated to diagnose the installation state of the pair of current detection units D as the calculated power supply index value W becomes larger. Is gradually increased toward the load increase side, the details of which will be described later.

In the present embodiment, the surplus power heater unit G is used as the U-phase electrical load Eu and the V-phase electrical load Ev.
That is, the operation control unit 6 connects the first surplus power heater drive unit 61 to the third surplus power heater drive unit 63 for driving the first surplus power heater F1 to the third surplus power heater F3 to the U phase line U. The fourth surplus power heater drive unit 64 to the sixth surplus power heater drive unit 66 that drive the fourth surplus power heater F4 to the sixth surplus power heater F6 are connected to the V-phase line V, as a U-phase side electric load Eu The above-mentioned diagnostic processing is configured to be executed in the form of being used as the V-phase side electric load Ev.

  The U-phase electrical load Eu is a three-stage load of different sizes, that is, a first U-phase electrical load Eu1 that is a small load, a second U-phase electrical load Eu2 that is an intermediate load, and a third U that is a large load. It is comprised so that it can change into the phase side electric load Eu3. The first U-phase electrical load Eu1 is configured by the first surplus power heater driver 61, and the second U-phase electrical load Eu2 is configured by the first surplus power heater driver 61 and the second surplus power heater driver 62. The third U-phase electrical load Eu3 is configured by the first surplus power heater driving unit 61, the second surplus power heater driving unit 62, and the third surplus power heater driving unit 63.

  Similarly, the V-phase electrical load Ev is a three-stage load having different magnitudes, that is, the first V-phase electrical load Ev1 being a small load, the second V-phase electrical load Ev2 being an intermediate load, a large load It is comprised so that it can change into a certain 3rd V phase side electric load Ev3. The first V-phase electrical load Ev1 is configured by the fourth surplus power heater drive unit 64, and the second V-phase electrical load Ev2 is configured by the fourth surplus power heater drive unit 64 and the fifth surplus power heater drive unit 65. The third V-phase electrical load Ev3 is configured by the fourth surplus power heater drive unit 64, the fifth surplus power heater drive unit 65, and the sixth surplus power heater drive unit 66.

  Then, as shown in FIG. 3, the U-phase electrical load Eu and the V-phase electrical load Ev are set to three stages depending on which of the three levels the power supply index value W has. It is done. That is, when the power supply index value W is less than the first power supply index value W1, the first U-phase side electrical load Eu1 and the first V-phase side electrical load Ev1 are set, and the power supply index value W is the first power supply. When the index value W1 or more and less than the second power supply index value W2, the second U-phase electrical load Eu2 or the second V-phase electrical load Ev2 is set, and the power supply index value W is the second power supply index. When it is the value W2 or more, the third U-phase electrical load Eu3 or the third V-phase electrical load Ev3 is set.

  Incidentally, in the present embodiment, the state in which the power supply index value W is less than the first power supply index value W1 is referred to as the small power supply index value W. Further, a state in which the power supply index value W is equal to or more than the first power supply index value W1 and less than the second power supply index value W2 is referred to as the medium state of the power supply index value W. Furthermore, the state in which the power supply index value W is equal to or greater than the second power supply index value W2 is referred to as the large scale of the power supply index value W.

  In addition, the detection of the change in the current value generated by applying any one of the first U-phase side electrical load Eu1, the second U-phase side electrical load Eu2 and the third U-phase side electrical load Eu3 is the current before the load is applied. It is detected whether or not the absolute value of the current value after applying the load has changed by the set value or more with respect to the absolute value of the value.

  The set values are provided corresponding to the magnitudes of the first U-phase electrical load Eu1, the second U-phase electrical load Eu2, and the third U-phase electrical load Eu3. For example, a current value of about 90% of the current value calculated from the respective power consumptions of the first U-phase electrical load Eu1, the second U-phase electrical load Eu2, and the third U-phase electrical load Eu3 is set as the set value Ru.

Further, in the present embodiment, an integrated current value obtained by integrating the current values detected by the pair of current detection units D is determined, and based on the integrated current value, the first U-phase electrical load Eu1 and the second U-phase electrical It is comprised so that the change of the electric current value which generate | occur | produces when load Eu2 and 3rd U-phase side electrical load Eu3 are made to act will be detected.
That is, as the current value before the first U-phase side electrical load Eu1, the second U-phase side electrical load Eu2, and the third U-phase side electrical load Eu3 are applied, or as the current value after applying those loads, Although it can be used, in the present embodiment, the first U-phase side electrical load Eu1 and the second U-phase side electrical load are eliminated by using the integrated value of the setting time (for example, 1 second) while excluding the influence of disturbance. It is possible to appropriately detect a change in current value caused by charging Eu2 and the third U-phase side electrical load Eu3.

  Further, the detection of the change in the current value generated by applying any one of the first V-phase electrical load Ev1, the second V-phase electrical load Ev2 and the third V-phase electrical load Ev3 is described above on the first U-phase side The electric load Eu1, the second U-phase side electric load Eu2, and the third U-phase side electric load Eu3 are configured to be similar to the detection of the change in the current value generated by the application of any one of them.

  In addition, at the time of installation of the heat and power supply unit H or the like, the operation control unit 6 is configured to execute a diagnosis process by giving a command using the remote control R.

(Details of diagnostic process)
Next, the diagnosis process performed by the operation control unit 6 will be described based on the flowcharts of FIGS. 4 and 5.
First, current values of the pair of current detection units D are detected (# 20). Then, the absolute value of the larger current value detected by each of the pair of current detection units D is determined as the power supply index value W (# 21).

  Next, it is determined whether the power supply index value W is small (# 22). If the power supply index value W is small, the first U-phase electrical load Eu1 is turned on by turning on the first surplus power heater switch 61S (# 23). If the power supply index value W is not a small scale, it is determined whether the power supply index value W is a medium scale (# 24).

  When the power supply index value W is medium size, the second U-phase electrical load Eu2 is turned on by turning on the first surplus power heater switch 61S and the second surplus power heater switch 62S (# 25 ). If the power supply index value W is not medium, it is assumed that the power supply index value W is large by turning on the first surplus power heater switch 61S to the third surplus power heater switch 63S. The third U-phase electrical load Eu3 is applied (# 26).

  After one of # 23, # 25 and # 26 is executed, it is determined whether or not a change in current value is detected in one of the pair of current detection units D (# 27). When a change in current value is not detected, the process shifts to the process of # 20, and the processes of # 20 to # 27 are repeated.

  Then, even if the process from # 20 to # 27 is repeated three times, if no change in the current value is detected at # 27, for example, it is assumed that the size of the U-phase electrical load Eu applied is insufficient. A determination is made, and an alarm process such as displaying an abnormal state with the remote controller R is executed (# 29). That is, when a change in the current value is not detected in any of the pair of current detection units D when the U-phase side electric load Eu is applied, it is determined to be an abnormal state. .

In # 27, when a change in current value is detected in any of the pair of current detection units D, it is determined whether or not the change in current value is detected by the first current detection unit D1 (# 30) When the change of the current value is detected by the first current detection unit D1, the first current detection unit D1 is set to the U phase side (# 31).
Subsequently, it is determined whether the current value is a positive value (# 33). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 34). .

If the change of the current value is not detected by the first current detection unit D1 at # 30, the change of the current value is detected by the second current detection unit D2, so the second The current detection unit D2 is set to the U phase side (# 32).
Subsequently, it is determined whether the current value is a positive value (# 33). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 34). .

  Subsequently, the determination of the installation state of the pair of current detection units D by applying the first V-phase electrical load Ev1 to the third V-phase electrical load Ev3 is executed. This first V-phase electrical load Ev1 The procedure for determining the installation state of the pair of current detection units D by applying the third V-phase electrical load Ev3 is performed by applying the first U-phase electrical load Eu1 to the third U-phase electrical load Eu3 described above The procedure is the same as the procedure for determining the installation state of the pair of current detection units D.

  That is, first, respective current values of the pair of current detection units D are detected (# 35). Then, the absolute value of the larger current value detected by each of the pair of current detection units D is determined as the power supply index value W (# 36).

  Next, it is determined whether the obtained power supply index value W is small (# 37). If the power supply index value W is small, the fourth surplus power heater switch 64S is turned on to apply the first V-phase electrical load Ev1 (# 38). If the power supply index value W is not a small scale, it is determined whether the power supply index value W is a medium scale (# 39).

  Then, if the power supply index value W is medium, the second V-phase electrical load Ev2 is turned on by turning on the fourth surplus power heater switch 64S and the fifth surplus power heater switch 65S (# 40 ). If the power supply index value W is not medium, it is assumed that the power supply index value W is large by turning on the fourth surplus power heater switch 64S to the sixth surplus power heater switch 66S. The third V-phase electrical load Ev3 is turned on (# 41).

After one of # 38, # 40 and # 41 is executed, it is determined whether or not a change in current value is detected in any of the pair of current detection units D (# 42). When a change in current value is not detected, the process proceeds to # 35, and the processes from # 35 to # 42 are repeated.
Then, even if the process from # 35 to # 42 is repeated three times, if the change in the current value is not detected at # 42, for example, it is assumed that the magnitude of the V-phase electrical load Ev applied is insufficient. A determination is made, and an alarm process such as displaying an abnormal state with the remote control R is executed (# 44). That is, when the V-phase side electric load Ev is selectively applied, if a change in current value is not detected in either of the pair of current detection units D, it is determined to be an abnormal state. It is done.

In # 42, when a change in current value is detected in any of the pair of current detection units D, it is determined whether or not the change in current value is detected by the first current detection unit D1 (# 45) If the change in current value is detected by the first current detection unit D1, the first current detection unit D1 is set to the V phase side (# 46).
Subsequently, it is determined whether the current value is a positive value (# 48), and when the current value is not a positive value (a negative value), the current value is set to be inverted (# 49). .

If the change of the current value is not detected by the first current detection unit D1 at # 45, the change of the current value is detected by the second current detection unit D2, so the second The current detection unit D2 is set to the V phase side (# 47).
Subsequently, it is determined whether the current value is a positive value (# 48), and when the current value is not a positive value (a negative value), the current value is set to be inverted (# 49). .

(Summary of the first embodiment)
In the first embodiment, before the U-phase electrical load Eu and the V-phase electrical load Ev are selectively applied in the diagnosis processing, based on the current values detected by each of the pair of current detection units D. A power supply index value W corresponding to the supply amount of power from the commercial power source 7 is obtained. Then, the U-phase electrical load Eu and the V-phase electrical load Ev are selectively operated in the form of increasing the power supply index value W as the power supply index value W increases, and diagnosing the installation state of the pair of current detectors D. become.

  Thereby, when the power supply index value W is small, the U-phase side electrical load Eu and the V-phase side electrical load Ev to be operated can be reduced, so that an electric device with small power consumption is connected to the commercial power supply 7 In this case, it is possible to reduce the U-phase side electrical load Eu and the V-phase side electrical load Ev selectively applied.

  Therefore, while reducing power consumption due to the U-phase side electrical load Eu and the V-phase side electrical load Ev applied in the diagnosis process, the diagnostic process for diagnosing the installation state of the pair of current detection units D can be performed.

Second Embodiment
Next, a second embodiment will be described. In the second embodiment, the operation control unit 6 uses the electric device Eb included in the heat source unit Hb as the U-phase electric load Eu and the V-phase electric load Ev. The second embodiment differs from the first embodiment in that it is configured to perform diagnostic processing in a form, and the other configuration is the same as the first embodiment, so only the parts different from the first embodiment will be described. The detailed description of the same configuration as that of the first embodiment will be omitted.

  In the second embodiment, the operation control unit 6 operates as the U-phase electrical load Eu connected to the U-phase wire U and the V-phase electrical load Ev connected to the V-phase wire V. The diagnostic process is configured to be executed in a mode using the main-body-side electric device E1 of the processing unit B1 and the auxiliary-side electric device E2 of the auxiliary processing unit B2.

  Therefore, in the second embodiment, the operation control unit 6 switches one of the first terminal block 55A and the second terminal block 55B to the output action state before the diagnosis processing, and the operation control unit 6 of the terminal side control unit 11 Connection confirmation processing for determining which of the first terminal block 55A and the second terminal block 55B the main processing unit B1 is connected to by communicating between the main terminal processing unit B1 and the first terminal block 55A When connected, the main body side electric device E1 is set to the U phase side electric load Eu, the auxiliary processing portion B2 is set to the V phase side electric load Ev, and the main portion processing portion B1 is connected to the second terminal block 55B. In this case, the load setting process is performed to set the main body side electric device E1 to the V phase side electric load Ev and the auxiliary side electric device E2 to the U phase side electric load Eu.

  That is, at the time of installation of the heat and power supply unit H, etc., the operation control unit 6 executes the test process in which the connection check process, the load setting process, and the diagnostic process are sequentially performed by instructing the test command with the remote control R. Is configured as.

(Details of test process)
Next, test processing executed by the operation control unit 6 will be described based on the flowchart of FIG.
First, switch operation processing is performed to turn on the U-phase side switch 56A and turn off the V-phase side switch 56B (# 51), and then execute test communication with the terminal-side control unit 11 ( # 52) Then, it is determined whether the test communication with the terminal-side control unit 11 is appropriate (# 53).

  By the way, the purpose of the test communication is to confirm whether power is supplied to the terminal control unit 11 from the first terminal block 55A by connecting the terminal control unit 11 to the first terminal block 55A. For example, the operation control unit 6 communicates response request information to the terminal control unit 11, and the terminal control unit 11 receives the response request information. When the response information from the terminal control unit 11 is received, the operation control unit 6 recognizes that the communication is appropriate.

  If it is determined at # 53 that the test communication is appropriate, the main unit side electric device E1 is set to the U phase side electric load Eu, and the auxiliary side electric device E2 is set to the V phase side electric load Ev (# 54), and then shift to the diagnostic process (# 59).

  If it is determined at # 53 that the test communication is not appropriate, switch operation processing is performed to turn off the U-phase switch 56A and turn on the V-phase switch 56B (# 55), and then, The test communication is executed with the terminal side control unit 11 (# 56), and thereafter, it is determined whether the test communication with the terminal side control unit 11 is appropriate (# 57).

If it is determined in # 57 that the test communication is appropriate, the main-body-side electric device E1 is set to the V-phase-side electric load Ev, and the auxiliary-side electric device E2 is set to the U-phase-side electric load Eu (# 58), and then shift to a diagnostic process (# 59).
If it is determined in # 57 that the test communication is not appropriate, the main processing unit B1 and the auxiliary processing unit B2 of the heat source unit Hb are abnormal such that they are not connected to the power generation unit Ha. Alarm processing such as displaying an abnormal state is executed (# 60).

  Incidentally, the above-described processes of # 51 to # 53 and the processes of # 55 to # 57 correspond to the connection confirmation process, and the processes of # 54 and # 58 correspond to the load setting process.

  Then, in the load setting process, for example, when the main body side electric device E1 is set to the U phase side electric load Eu and the auxiliary side electric device E2 is set to the V phase side electric load Ev, the U phase side electric load As the load Eu, for example, the multifunctional circulation pump 20, the heating circulation pump 21 and the bath follow-up circulation pump 22 can be used, and as the V-phase electrical load Ev, for example, the blower fan 2C can be used it can.

  In this case, for the U-phase electrical load Eu, the multi-functional circulation pump 20 is the first U-phase electrical load Eu1, and the two pumps of the multi-functional circulation pump 20 and the heating circulation pump 21 are the second U-phase electrical load Eu2. The diagnostic processing shown in FIGS. 3 and 4 is performed with the three pumps of the multifunctional circulation pump 20, the heating circulation pump 21 and the bath follow-up circulation pump 22 as the third U-phase side electric load Eu3.

  The V-phase electrical load Ev is changed stepwise from the first V-phase electrical load Ev1 to the third V-phase electrical load Ev3 by changing the rotational speed of the blower fan 2C. Specifically, the state in which the blower fan 2C has a rotational speed of 40% of the rated rotational speed is referred to as the first V-phase electrical load Ev1, and the state in which the blower fan 2C is having a rotational speed of 70% of the rated rotational speed is the second V The diagnosis process shown in FIGS. 3 and 4 is performed with the phase-side electrical load Ev2 and the blower fan 2C at the rated rotational speed as the third V-phase side electrical load Ev3.

(Summary of the second embodiment)
In the second embodiment, as in the first embodiment, it is possible to perform a diagnostic process for diagnosing the installation state of the pair of current detection units D while reducing power consumption.
In the second embodiment, one of the main-body-side electric device E1 and the auxiliary-side electric device E2 as the electric device Eb equipped by the heat source Hb is used as the U-phase electric load Eu, and Since the diagnostic processing is performed while using the other of the main-body-side electric device E1 and the auxiliary-side electric device E2 as the V-phase-side electric load Ev, the electric device Eb equipped in the heat source section Hb is used , Can perform diagnostic processing.
Therefore, for example, even when the surplus power heater unit G equipped by the power generation unit Ha is omitted, the diagnosis process can be performed. That is, when the power generation unit Ha is connected to the commercial power supply 7 so as to allow reverse power flow, the surplus power heater unit G is omitted, but even in such a case, diagnosis processing can be performed.

Third Embodiment
Next, a third embodiment will be described. In the third embodiment, the operation control unit 6 uses the main-body-side electric device E1 provided in the main-body processing unit B1 of the heat source unit Hb as the U-phase side electric load Eu. The fourth embodiment differs from the first embodiment in that diagnosis processing is performed using an electric device provided to the power generation unit Ha as the V-phase electrical load Ev, and the other configuration is the first embodiment. The configuration is the same as that of the embodiment, so only the portions different from the first embodiment will be described, and the detailed description of the same configuration as the first embodiment will be omitted.

  In the third embodiment, the second drive circuit unit 52 drives the hot water circulation pump Pb which is a large electric load among the electric devices provided in the power generation unit Ha, and the fourth drive circuit unit 54 is a large electric. In view of driving the plurality of second electric heaters 47 serving as a load, the second drive circuit unit 52 and the second drive circuit unit 52 connected to the V-phase extension Nv and the neutral extension No of the power generation unit Ha The fourth drive circuit unit 54 is configured to be used as the V-phase electrical load Ev.

  That is, first, the operation control unit 6 switches one of the first terminal block 55A and the second terminal block 55B to the output action state and communicates with the terminal-side control unit 11 before the diagnosis processing. A connection confirmation process is performed to determine which of the first terminal block 55A and the second terminal block 55B the main processing unit B1 is connected to.

  Then, if the operation control unit 6 is connected to the second terminal block 55B, the remote control R notifies of a comment prompting that the operation control unit 6 be replaced with the first terminal block 55A, etc. Execute the process

  Next, in a state in which the main processing unit B1 is connected to the first terminal block 55A, the operation control unit 6 sets the main electric device E1 to the U phase electric load Eu, and the V phase of the power generation unit Ha. A load setting process is performed to set the second drive circuit unit 52 and the fourth drive circuit unit 54 connected to the extension Nv and the extension No for neutral to the V-phase electrical load Ev.

  After that, similarly to the first embodiment, a diagnostic process for diagnosing the installation state of the pair of current detection units D is executed while selectively applying the U-phase electrical load Eu and the V-phase electrical load Ev.

  In the diagnosis process of the present embodiment, for example, the multifunction circulation pump 20, the heating circulation pump 21 and the bath follow-up circulation pump 22 can be used as the U-phase electrical load Eu, and the multifunction circulation pump 20 can be used. Is the first U-phase electrical load Eu1, and the two pumps of the multifunctional circulation pump 20 and the heating circulation pump 21 are the second U-phase electrical load Eu2. The multifunctional circulation pump 20, the heating circulation pump 21 and the bath follow-up The diagnostic processing shown in FIGS. 3 and 4 is performed with the three pumps of the circulation pump 22 as the third U-phase side electric load Eu3.

  Further, as the V-phase electrical load Ev, for example, the hot water circulation pump Pb connected to the second drive circuit unit 52 is set as the first V phase electrical load Ev1 and added to the hot water circulation pump Pb to the fourth drive circuit unit 54. The second electric heater connected to the fourth drive circuit unit 54 in addition to the hot water circulation pump Pb with the second electric heater 47 connected being the output of 50% of the rated output as the second V phase side electric load Ev 2 The diagnosis process shown in FIGS. 3 and 4 is performed with the state where the rated output is 47 as the third V-phase electrical load Ev3.

  As described above, the operation control unit 6 sequentially performs the connection confirmation process, the notification process, the load setting process, and the diagnosis process by instructing the test command with the remote control R when installing the heat and power supply unit H or the like. It is configured to perform a test process.

(Summary of the third embodiment)
In the third embodiment, as in the first embodiment, it is possible to perform a diagnosis process for diagnosing the installation state of the pair of current detection units D while reducing power consumption.
In the third embodiment, the second drive circuit unit uses the main-body-side electric device E1 as the electric device Eb equipped by the heat source Hb as the U-phase electric load Eu and is equipped with the power generation unit Ha. The diagnostic process can be favorably performed while using the 52 and the fourth drive circuit unit 54 as the V-phase electrical load Ev.
Therefore, for example, even when the surplus power heater unit G equipped by the power generation unit Ha is omitted, the diagnosis process can be performed. That is, when the power generation unit Ha is connected to the commercial power supply 7 so as to allow reverse power flow, the surplus power heater unit G is omitted, but even in such a case, diagnosis processing can be performed.

[Another embodiment]
Next, other alternative embodiments will be listed.
(1) In the first to third embodiments, in the diagnosis processing, each of the U-phase side electrical load Eu and the V-phase side electrical load Ev is changed to the small load side according to the magnitude of the power supply index value W. To increase the load on the large load side in three stages. However, the present invention is not limited thereto. The U-phase electrical load Eu and the V-phase electrical load Ev are not limited to the magnitude of the power supply index value W Depending on the size, it may be configured to increase stepwise in two stages from small load side to large load side, and may be configured to increase stepwise in four or more stages .

(2) In the first to third embodiments, in the diagnosis process, each of the U-phase electrical load Eu and the V-phase electrical load Ev is controlled to the small load side according to the magnitude of the power supply index value W. From the small load side, the U-phase electrical load Eu and the V-phase electrical load Ev are respectively increased from the small load side. It may be configured to steplessly increase in proportion to the magnitude of the power supply index value W toward the load side.

(3) In the first to third embodiments, the power supply index value W is determined as the absolute value of the larger one of the absolute values of the current values detected by the pair of current detection units D. However, the power supply index value W obtained based on the current value detected by each of the pair of current detection units D is not limited to this. For example, the power supply index value W can be determined in various forms, such as obtaining a value obtained by adding each of the absolute values of the current values detected by the pair of current detection units D as the power supply index value W. .

(4) In the first embodiment, the surplus power heater unit G is used as the U-phase electrical load Eu and the V-phase electrical load Ev, but the present invention is not limited thereto. As the side electric load Ev, a plurality of electric devices other than the surplus power heater unit G provided in the power generation unit Ha may be used.

(5) In the first embodiment, the surplus power heater unit G is used as the U-phase electrical load Eu and the V-phase electrical load Ev, but the present invention is not limited thereto. As the side electric load Ev, a plurality of electric devices other than the surplus power heater unit G provided in the power generation unit Ha may be used.

(6) In the first to third embodiments, the thermoelectric control unit C that controls the operation of the cogeneration unit H controls the operation of the operation control unit 6 that controls the operation of the power generation unit Ha and the heat source unit Hb. Although the case where it comprises from terminal side control part 11 was illustrated, operation control part 6 and terminal side control part 11 are put together as one control part, and it is a form which comprises thermoelectric control part C as one control part. You may implement.

(7) In the first to third embodiments described above, the power generation unit Ha and the heat source unit Hb are configured as separate units. However, the power generation unit Ha and the heat source unit Hb are configured as one unit. You may implement in the form which

(8) In the first to third embodiments, the case where the power generation unit Ha includes the fuel cell 4 has been exemplified. However, the power generation unit Ha is driven by an engine that operates with fuel gas and the engine The present invention is also applicable to the case where a generator is provided.

(9) In the first to third embodiments, the installation states of the pair of current detection units D while selectively acting the U-phase electrical load Eu and the V-phase electrical load Ev as the diagnostic processing That is, the diagnosis of whether each of the pair of current detection units D is installed in the U-phase signal line Su or the V-phase signal line Sv, and the diagnosis of the installation direction of each pair of current detection units D Although the case where it carries out was illustrated, for example, before making U phase side electric load Eu and V phase side electric load Ev act, based on the flow direction of the current which a pair of current detection parts D detect, a pair of current detection Each installation direction of the part D is diagnosed, and then, while the U-phase electrical load Eu and the V-phase electrical load Ev are selectively applied, each of the pair of current detection parts D is a signal line for U-phase Perform diagnosis on which of Su and V-phase signal line Sv is installed Etc. To way, specific configuration of the diagnostic process can various modifications.

  The configurations disclosed in the above embodiment (including the other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments as long as no contradiction arises. The embodiment disclosed in the present specification is an exemplification, and the embodiment of the present invention is not limited thereto, and can be appropriately modified without departing from the object of the present invention.

  As described above, it is possible to provide a combined heat and power supply system that can perform diagnostic processing for diagnosing the installation state of a pair of current detection units while reducing power consumption.

6 Operation control unit 7 Commercial power source D Current detection unit Eu U phase side electrical load Ev V phase side electrical load Ha Power generation unit U U phase line V V phase line W Power supply index value

Claims (4)

A single-phase three-wire commercial power supply and a power generation unit connected to the grid,
A pair of current detection units separately installed on each of the U-phase line and the V-phase line of the commercial power supply;
An operation control unit for controlling the operation is provided.
The operation control unit selects a U-phase electrical load to which power is supplied from the U-phase line and a V-phase electrical load to which power is supplied from the V-phase line while the operation of the power generation unit is stopped A combined heat and power supply system configured to perform a diagnosis process for operating the pair of current detection units in a diagnostic manner.
In the diagnosis process, the operation control unit
Before the U-phase side electrical load and the V-phase side electrical load are selectively applied, based on the current value detected by each of the pair of current detection units, the amount of power supplied from the commercial power supply A cogeneration system configured to obtain a corresponding power supply index value and to set the U-phase side electrical load and the V-phase side electrical load larger as the power supply index value is larger.   The operation control unit integrates current values detected by each of the pair of current detection units before selectively applying the U-phase side electric load and the V-phase side electric load in the diagnosis process. The combined heat and power supply system according to claim 1, wherein the integrated current value is determined, and the power supply index value is determined based on the integrated current value.   The operation control unit integrates current values detected by each of the pair of current detection units when the U-phase side electric load and the V-phase side electric load are selectively applied in the diagnosis process. The combined heat and power supply system according to claim 1 or 2, wherein the integrated current value is determined, and the installation state of the pair of current detection units is diagnosed based on the integrated current value.   When the operation control unit causes the U-phase side electrical load and the V-phase side electrical load to selectively act in the diagnosis process, a change in the current value occurs in either of the pair of current detection units. The cogeneration system according to any one of claims 1 to 3, which is configured to determine an abnormal state when it is not detected.

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