JP6555986B2 - Combined heat and power system - Google Patents

Description

The present invention includes a power generation unit interconnected with a single-phase three-wire commercial power source, a waste heat recovery and consumption unit that recovers and consumes exhaust heat of the power generation unit, a U-phase line and V of the commercial power source A pair of current detection units installed separately for each of the phase lines and a power generation control unit for controlling the operation of the power generation unit are provided,
The power generation control unit selectively operates the U-phase side electrical load connected to the U-phase line and the V-phase side electrical load connected to the V-phase line, and the pair of current detection units are installed. The present invention relates to a combined heat and power system configured to execute a diagnostic process for diagnosing a state.

Such a combined heat and power system is configured such that the installation state of the pair of current detection units can be diagnosed by the power generation control unit executing diagnosis processing.
That is, for example, each of the pair of current detection units detects a current flowing from the commercial power supply side to the load side as positive, and detects a current flowing from the power generation unit side to the commercial power supply side as negative as an appropriate state. In this case, if the mounting direction of the pair of current detection units is reversed, plus and minus are reversed, so it is diagnosed whether the mounting direction of the pair of current detection units is properly installed. In addition, a pair of current detection units are properly installed on the U-phase line and V-phase line, and the current detection unit that detects the current of the U-phase line detects the current of the U-phase line as appropriate. In addition, the current detection unit that detects the current of the V-phase line can diagnose whether or not the current of the V-phase line is detected as appropriate.

  As a conventional example of such a combined heat and power system, the power generation unit is provided with a U-phase heater means connected to the U-phase line and a V-phase heater means connected to the V-phase line as heater means for surplus power consumption. Is used to perform diagnostic processing while using the U-phase heater means as the U-phase side electric load and the V-phase heater means as the V-phase side electric load (for example, Patent Document 1). reference.).

  That is, in Patent Document 1, 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 source, the power generated by the power generation unit flows to the commercial power source side. In order to avoid the so-called reverse power flow, the U-phase heater means and the V-phase heater means as the heater means for surplus power consumption are operated, and in the diagnosis process, as the heater means for surplus power consumption The U-phase heater means and the V-phase heater means are used as the U-phase side electric load and the V-phase side electric load.

Although not described in Patent Document 1, generally, the detection information of the pair of current detection units is also used for obtaining the power usage amount using the power of the commercial power source, and the obtained power usage amount. However, it is displayed on a remote controller or the like that commands operation information of the combined heat and power system.
Incidentally, the 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 properly detects the current of the V-phase line. It needs to be detected.

  In Patent Document 1, instead of operating the U-phase heater unit and the V-phase heater unit, the amount of power supplied to the U-phase line and the V-phase line is changed while increasing or decreasing the generated power of the power generation unit. It is also described that the pair of current detection units detect whether the U-phase line and the V-phase line are properly installed. For diagnostic processing, the generated power of the power generation unit is changed. There is 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 includes a reforming unit that reforms a fuel gas such as city gas, In some cases, the fuel cell is configured to include a fuel cell that generates electricity using the hydrogen-containing gas from the reforming unit as fuel (see, for example, Patent Document 2).
Incidentally, in Patent Document 2, similarly to Patent Document 1, it is described that an electric heater is provided as a heater means for surplus power consumption.

JP 2002-286785 A JP 2005-69667 A

  In recent years, it has been studied to allow a reverse power flow in which the power generated by the power generation unit flows to the commercial power supply side. In this case, the heater means for consuming surplus power is consumed. Is expected.

  In recent years, it has been studied to enhance facilities for supplying hydrogen gas (hydrogen-containing gas). In this case, when the power generation unit generates power with a fuel cell, fuel gas such as city gas is used. It is expected that the reforming unit for the reforming process is omitted.

  As described above, when the reverse power flow through which the power generated by the power generation unit flows to the commercial power supply side is permitted and the heater means for surplus power consumption that becomes a large electric load is omitted, the pair of current detection units are subjected to diagnostic processing. Since the heater means for surplus power consumption cannot be used as the U-phase side electrical load and the V-phase side electrical load that are required to perform the U-phase side electrical load, U that is necessary for the diagnostic processing of the pair of current detection units It becomes difficult to secure the phase-side electric load and the V-phase side electric load with an electric device provided in the power generation unit.

  Incidentally, if the power generation unit is configured to include a reforming unit that reforms a fuel gas such as city gas and a fuel cell that generates power using the hydrogen-containing gas from the reforming unit as a fuel, start-up In some cases, an electric heater for starting up the temperature of each part of the reforming unit will be provided. Therefore, the electric heater for starting up is required to perform diagnostic processing on the pair of current detection units and the U-phase side electric load. It can be considered to be used as a V-phase side electric load.

  However, as described above, when the reforming unit is omitted, the U-phase side electric load and the V-phase that are necessary for performing diagnostic processing on the pair of current detection units even when the power generation unit is configured by a fuel cell. It becomes difficult to secure the side electric load with an electric device provided in the power generation unit.

  The present invention has been made in view of the above circumstances, and its purpose is to perform diagnostic processing for diagnosing the installation state of a pair of current detection units by effectively using an electrical device provided in the exhaust heat recovery and consumption unit. The point is to provide a cogeneration system that can perform well.

A combined heat and power system of the present invention includes a power generation unit that is grid-connected to a single-phase three-wire commercial power source, a waste heat recovery and consumption unit that recovers and consumes exhaust heat of the power generation unit, and a U of the commercial power source. A pair of current detection units installed separately for each of the phase line and the V-phase line, and a power generation control unit for controlling the operation of the power generation unit are provided,
The power generation control unit selectively operates the U-phase side electrical load connected to the U-phase line and the V-phase side electrical load connected to the V-phase line, and the pair of current detection units are installed. It is configured to execute a diagnostic process for diagnosing a state, and its characteristic configuration is
The exhaust heat recovery and consumption unit is provided in a form including an electrical device connected to the U-phase line or the V-phase line,
The power generation control unit executes the diagnosis process in a form using the electric device included in the exhaust heat recovery and consumption unit as at least one of the U-phase side electric load and the V-phase side electric load. Composed of
The power generation unit is provided with a U-phase side connection unit that outputs power from the U-phase line to the outside, and a V-phase side connection unit that outputs power from the V-phase line to the outside.
The waste heat recovery and consumption part is connected to one of the U-phase side connection part and the V-phase side connection part and includes a main body side electric device as the electric device, the U phase side connection part, and the It is comprised in the form provided with the auxiliary processing part which is an auxiliary heat source machine which is connected to the other of the V phase side connection part, and is provided with auxiliary side electric equipment as the electric equipment,
The power generation control unit is configured to execute the diagnostic processing in a form in which the main body side electric device and the auxiliary side electric device are used as the U phase side electric load and the V phase side electric load,
The U-phase side connecting portion and the V-phase side connecting portion can be switched between an output action state and an output stop by a U-phase side intermittent portion and a V-phase side intermittent portion that can be intermittently operated by the power generation control portion. Configured,
The main body processing unit is configured to include a terminal-side control unit that communicates with the power generation control unit in a power supply state by connection with the U-phase side connection unit and the V-phase side connection unit,
The power generation control unit communicates with the terminal-side control unit by switching one of the U-phase side connection unit and the V-phase side connection unit to the output operation state before the diagnosis process. A connection confirmation process for determining whether the main body processing unit is connected to the U-phase side connection unit or the V-phase side connection unit; and the main body processing unit is connected to the U-phase side connection unit In this case, the main body side electric device is set as the U-phase side electric load, the auxiliary side electric device is set as the V phase side electric load, and the main body processing unit is connected to the V phase side connection portion. In this case, it is configured to execute a load setting process in which the main body-side electric device is set as the V-phase side electric load and the auxiliary-side electric device is set as the U-phase side electric load .

That is, the electrical equipment equipped in the exhaust heat recovery and consumption unit is provided in a form connected to the U-phase line or the V-phase line.
And the control part for electric power generation is comprised so that a diagnostic process may be performed in the form using the electric equipment with which an exhaust heat recovery consumption part is provided as at least one of U phase side electric load and V phase side electric load. Yes.

  In other words, when there are electrical devices connected to the U-phase wire and electrical devices connected to the V-phase wire as electrical devices equipped in the exhaust heat recovery and consumption unit, these electrical devices are connected to the U-phase side electricity. The diagnosis process can be executed in a form used as a load and a V-phase side electric load.

  In addition, when there are electrical devices connected to the U-phase wire and electrical devices connected to the V-phase wire as electrical devices equipped in the exhaust heat recovery and consumption unit, or electrical devices equipped in the exhaust heat recovery and consumption unit As described above, when there is an electrical device connected to the U-phase wire or the V-phase wire, the electrical device equipped in the exhaust heat recovery and consumption unit is used as one of the U-phase side electrical load and the V-phase side electrical load. The diagnostic processing can be executed in a form in which the electric device included in the power generation unit is used as one of the U-phase side electric load and the V-phase side electric load.

  In other words, the waste heat recovery and consumption unit is equipped with electrical equipment that has a large electrical load, such as a hot water circulation pump that circulates hot water and an electric heater for preventing freezing. The device can be used as a U-phase side electrical load or a V-phase side electrical load.

  The power generation unit is equipped with electrical equipment such as a circulation pump that circulates hot and cold water and an anti-freezing electric heater to recover exhaust heat even if the heater means and the reforming unit for surplus power consumption are omitted. Therefore, the electric equipment with which the power generation unit is equipped can be used as the U-phase side electric load or the V-phase side electric load.

  As described above, since the electrical equipment equipped in the exhaust heat recovery and consumption unit is used as an electrical device connected to the U-phase wire or an electrical device connected to the V-phase wire, diagnostic processing is performed. When the generated power is allowed to flow backward to the commercial power supply side, surplus power consumption heater means for consuming surplus power is omitted, and when the power generation unit generates power with a fuel cell, it contains hydrogen. Even if the reforming unit for reforming the fuel gas such as city gas is omitted due to the supply of gas (hydrogen gas), while using the electrical equipment equipped in the exhaust heat recovery and consumption unit The diagnostic process can be performed satisfactorily.

  In short, according to the combined heat and power supply system of the present invention, it is possible to satisfactorily perform diagnostic processing for diagnosing the installation state of the pair of current detection units by effectively using the electrical equipment provided in the exhaust heat recovery and consumption unit.

Further , the main body processing unit and the auxiliary processing unit of the exhaust heat recovery and consumption unit are dispersedly connected to the U-phase side connection unit and the V-phase side connection unit provided in the power generation unit.
And, one of the main body side electric device and the auxiliary side electric device is used as the U-phase side electric load, and the other of the main body side electric device and the auxiliary side electric device is used as the V phase side electric load. However, the diagnostic process is executed.

  In other words, the waste heat recovery and consumption unit includes a main body processing unit equipped with electric equipment that is a large electric load, such as a hot water circulation pump for circulating hot water and an electric heater for freezing prevention, as a main body side electric equipment, and hot water circulation. And an auxiliary processing unit equipped with a backup boiler for heating hot water circulated by a pump. The auxiliary processing unit includes a blower for supplying combustion air to the combustion burner of the backup boiler, and freezing of the pipeline of the backup boiler. An electric device that is a large electric load, such as an anti-freezing electric heater for preventing the above, is installed as an auxiliary electric device.

  Therefore, the diagnostic process can be performed satisfactorily while using the main body side electric device and the auxiliary side electric device as the U phase side electric load and the V phase side electric load.

In short, according to the feature structure of the cogeneration system of the present invention, while using the body-side electrical equipment and auxiliary side electrical equipment provided in the exhaust heat recovery consumption unit, can be performed well diagnostic process.

Further , it is determined whether the main body processing unit is connected to the U-phase side connecting portion or the V-phase side connecting portion by the connection confirmation processing executed before the diagnosis processing, and based on the determination result, the main body side A load setting process for distributing the electrical device and the auxiliary electrical device to the V-phase electrical load and the U-phase electrical load is executed.

Therefore, even if the main body processing unit is connected to either the U-phase side connection portion or the V-phase side connection portion, the main body-side electric device and the auxiliary-side electric device are changed into the V-phase side electric load and the U-phase side electric load . Since it can determine appropriately, a diagnostic process can be performed exactly.

In short, according to the feature structure of the cogeneration system of the present invention, the main processing unit is also connected to one of the U-phase-side connecting portion and the V-phase-side connecting portion, can be performed accurately diagnosis process.

Schematic configuration diagram of cogeneration system Electric system diagram of heat source cogeneration system Flow chart showing test process Flow chart showing diagnostic processing

Embodiment
Hereinafter, a combined heat and power system according to the present invention will be described with reference to the drawings.
(Overall configuration of the combined heat and power unit)
As shown in FIG. 1, the combined heat and power system includes a combined 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 receives exhaust heat from the power generation unit Ha. A hot water storage tank 1 for storing the recovered hot water and an auxiliary heat source machine 2 as a backup boiler that burns using a fuel gas such as city gas are provided.

The power generation unit Ha includes a fuel cell 4 that generates power using hydrogen gas (hydrogen-containing gas) supplied from the hydrogen gas supply source G through the hydrogen gas supply path 3. The hydrogen gas supply path 3 is provided with a supply interrupt valve 3A for interrupting the supply of hydrogen gas.
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 flow passage 4d is provided.

Cooling water circulation path 5A for recovering heat generated by the fuel cell 4 with cooling water, hot water circulation path 5B for circulating hot water between the power generation unit Ha and the heat source unit Hb, and cooling water for circulation through the cooling water circulation path 5A And a heat exchanging section 5C for exchanging heat between the hot water circulating in the hot water circulation path 5B.
The cooling water circulation path 5A is provided with a cooling water circulation pump Pa and a cooling water storage tank Q, and the hot water circulation path 5B is provided with a hot water circulation pump Pb.

  Then, hot water in the hot water circulation path 5B that circulates hot water between the power generation section Ha and the heat source section Hb is heated with cooling water that circulates in the cooling water circulation path 5A, and the exhaust heat of the power generation section Ha is converted into the heat source section Hb. When the heat source section Hb performs general hot water supply, hot water supply hot water supply, heating operation, and reheating operation using exhaust heat, and the amount of heat is insufficient, the auxiliary heat source machine 2 The details are described later.

On the power output side of the fuel cell 4, a power generation control unit 6 that controls the operation of the power generation unit Ha is provided.
The power generation 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.

  The commercial power source 7 is a single-phase three-wire 100 / 200V. The distribution board 8 to which the commercial power supply 7 is connected is connected to a received power supply line 9, and the electric power 10 from the commercial power supply 7 is received through the received power supply line 9 by an electric load 10 such as a television, a refrigerator, or a washing machine. It is comprised so that it may be supplied to.

  The power generation control unit 6 is connected to the distribution board 8, the generated power from the fuel cell 4 is supplied to the electric load 10 through the received power supply line 9, and surplus power is supplied to the commercial power source 7 side. It is comprised so that. That is, the combined heat and power system of the present embodiment is configured as a system that allows the power of the power generation unit Ha to flow backward to the commercial power supply 7 side.

The heat source unit Hb is provided with a terminal side control unit 11 that controls the operation of the heat source unit Hb, and the operation control unit C that controls the operation of the combined heat and power supply unit H includes the power generation control unit 6 and the terminal side control unit. 11.
The power generation control unit 6 and the terminal side control unit 11 are connected via a communication line L, and are configured to be able to communicate various types of information. Further, with respect to the power generation control unit 6 and the terminal side control unit 11 A remote controller R that commands various information such as an operation start command and an operation stop command is provided in a form connected to the communication line L.

(Electric system)
As shown in FIG. 2, a U-phase line U, a V-phase line V, and a neutral line O of the commercial power supply 7 are drawn into the distribution board 8.
In the distribution board 8, a limiter (current limiter) 12 for limiting the load current to a contracted set value or less, a main breaker (earth leakage breaker) 13, and a plurality of the received power supply lines 9 described above are connected. A branch breaker 14 and a linkage breaker 15 for connecting the power generation unit Ha are provided.
In addition, in FIG. 2, although the form which supplies 100V electric power with respect to the electric load 10 is illustrated, you may make it supply 200V electric power 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 power generation control unit 6 through an internal wiring N, and the power supply terminal block 16 is connected to the linkage breaker 15 through an external wiring M.
The internal wiring N includes a U-phase extension Nu, a V-phase extension Nv, and a neutral extension No. The external wiring M includes a U-phase external line Mu, a V-phase external line Mv, and a neutral external line Mo. Is provided.

The distribution board 8 includes a first current detection unit D1 and a second current detection unit D2 that individually detect currents flowing in the U-phase line U and the V-phase line V of the commercial power supply 7, and the U-phase line U and the V-phase. 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 installed between the main breaker 13 and the branch breaker 14, but for example, the first current detection unit D1 and the first current detection unit D1 The installation location of the 1st current detection part D1 and the 2nd current detection part D2 can be changed, such as installing 2 current detection part D2 in the commercial power supply 7 side rather than the limiter 12. FIG.

A U-phase signal line Su and a V-phase signal line Sv are connected to the power generation control unit 6.
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 so as to detect the current flowing through the U-phase line U, and the second current detection unit D2 is installed so as to detect the current flowing through 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 a current transformer type AC current sensor. In the present embodiment, when the installation direction is appropriate, the commercial power source 7 supplies the electric load 10. It is configured to output a positive voltage signal when a current flows in the direction toward it, and to output a negative voltage signal when a current flows in the direction toward the commercial power supply 7 (when a current flows in a reverse power flow). .

  When the cogeneration system is installed at a place such as a home, the first current detection unit D1 connected to the U-phase signal line Su is installed on the U-phase line U in an appropriate installation direction, and the V-phase The second current detection unit D2 connected to the signal line Sv is installed on the V-phase line V in an appropriate installation direction. In the present embodiment, the power generation control unit 6 is a pair of current detection units. It is configured to execute a diagnostic process for diagnosing whether or not the installation state of D is appropriate, details of which will be described later.

  The combined heat and power system of this embodiment is grid-connected to the commercial power supply 7 in a state where reverse power flow is allowed, and the detection information of the first current detection unit D1 and the second current detection unit D2 is the commercial power supply. 7 is used to obtain the amount of power used (power consumption), and the obtained power usage is displayed on the remote controller R that commands the operation information of the combined heat and power supply unit H.

  Incidentally, the amount of power used is the sum of the product of the voltage of the U-phase line U and the current of the U-phase line U, and the product of the product of the voltage of the V-phase line V and the current of the V-phase line V. Therefore, it is necessary for the pair of current detection units D to appropriately detect the current of the U-phase line U and the current of the V-phase line V.

Although not shown, the power generation control unit 6 includes a U-phase side voltage detection unit that detects the voltage of the U-phase line U and a V-phase side voltage detection unit that detects the voltage of the V-phase line V. .
Then, the arithmetic processing unit (CPU) provided in the power generation control unit 6 is based on the detection information of the U-phase side voltage detection unit and the V-phase side voltage detection unit, and the detection information of the pair of current detection units D. The power usage amount described above is obtained, and the obtained power usage amount is displayed on the remote controller R.

(Configuration of heat source)
As shown in FIG. 1, in addition to the hot water storage tank 1 and the auxiliary heat source unit 2 described above, the multi-function circulation pump 20, the heating circulation pump 21, the bath recirculation circulation pump 22, and the exhaust heat recovery are included in the heat source Hb. A heat exchanger 23, a heat exchanger 24 for heating, and a heat exchanger 25 for bath remedy are provided.
The heat source 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 opening / closing valve 30, a three-way valve 31, and a circulation amount adjusting valve 32. Yes.

A tank upper passage 33 is provided at the upper part 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.
A water supply path 35 for supplying hot water from a water supply source such as tap water branches into a first water supply path 35 a connected to the hot water supply mixing valve 26 and a second water supply path 35 b connected to the bottom of the hot water storage tank 1. Has been.

The multi-function circulation path 36 in which the multi-function circulation pump 20 is arranged includes the auxiliary heat source unit 2, the circulation amount adjustment valve 32, the circulation on-off valve 30, the heating heat exchanger 24, the bath recuperation heat exchanger 25, and the three-way valve. 31 and the exhaust heat recovery heat exchanger 23.
The exhaust heat recovery heat exchanger 23 is connected to a hot water circulation path 5B that circulates hot water between the power generation unit Ha and the heat source unit Hb. The exhaust heat recovery heat exchanger 23 increases the amount of exhaust heat from the power generation unit Ha. The hot water circulating through the functional circuit 36 is heated.

The heat exchanger 24 for heating and the heat exchanger 25 for bath remedy are arranged in series in the multi-function circulation path 36, and the heating heat exchanger 24 and the heat for bath remedy are heated by opening and closing the circulation opening / closing valve 30. The flow of hot water through the exchanger 25 is configured to be interrupted.
A heat storage path 37 for connecting the downstream side portion of the auxiliary heat source device 2 in the multi-function circulation path 36 and the tank upper path 33 is provided, and a 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 heating terminal T such as a floor heating device is provided via the heating heat exchanger 24, and the heating circulation pump 21 is used for heating. It is provided in the circulation path 38.
The heating circulation path 38 is provided with a short-circuit path 38a and an expansion tank 39 for short-circuiting the heating heat medium. Further, a supply path 40 for supplying hot water from the water supply path 35 to the expansion tank 39 is provided, and a heating circuit supply valve 28 is provided in the supply path 40.

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

(Overview of heat source operation)
The heat source Hb is a multi-function circulation pump that closes the circulation on-off valve 30, opens the heat storage switching valve 29, and switches the three-way valve 31 to a state in which the tank lower path 34 and the multi-function circulation path 36 are communicated. By operating 20, the hot water storage operation is performed.

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

  Also, the multi-function circulation pump 20 is operated by opening the circulation on-off valve 30, closing the heat storage switching valve 29, and switching the three-way valve 31 to a state where the tank lower passage 34 and the multi-function circulation passage 36 are not communicated. Thus, while circulating hot water through the multi-function circuit 36, the heating operation for supplying the heat medium to the heating terminal T through the heating circuit 38, and heating the bath water through the bath circuit 42 are circulated. It is configured to perform bath memorial operation.

  Furthermore, the heat source Hb mixes the hot water from the tank upper passage 33 and the hot water from the first water supply passage 35a and supplies the hot water from the hot water supply passage 43, and branches the hot water in the hot water supply passage 43 to the hot water passage 44. Thus, the hot water supply operation for supplying the hot water to the bathtub 41 through the bath circulation path 42 is performed.

  In each of the heating operation and the bath retreat operation, basically, hot water is circulated through the multi-function circulation path 36 by the operation of the multi-function circulation pump 20, and the exhaust heat recovery heat exchanger 23 performs the operation of the power generation unit Ha. This is performed by heating the hot water circulating through the multi-function circulation path 36 by exhaust heat, but when the exhaust heat of the power generation unit Ha is insufficient, the auxiliary heat source unit 2 is operated to circulate through the multi-function circulation path 36. Will be heated.

Each of the general hot water supply operation and the hot water supply hot water operation is basically performed using the hot water in the hot water storage tank 1, but when the amount of hot water stored in the hot water storage tank 1 is insufficient, the auxiliary heat source machine 2 is It is configured to be operated by combustion.
That is, in the state where the multifunction circulation pump 20 is operated, the hot water flowing from the tank lower passage 34 to the multifunction circulation passage 36 via the three-way valve 31 is heated by the auxiliary heat source unit 2, The tank upper passage 33 can be made to flow through the heat storage passage 37.

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

  That is, the heat source controller 2D detects that the amount of hot water flowing through the finned-tube heat exchange unit 2A is greater than or equal to the set water flow rate by a water flow rate sensor (not shown), and the hot water temperature sensor (Not shown), when it is detected that the temperature of the hot water flowing through the finned-tube heat exchange unit 2A is equal to or lower than a set target temperature (for example, 70 ° C.), the operation of the heating burner 2B and the blower fan 2C And the heating amount of the heating burner 2B is adjusted so that the temperature of the heated hot water becomes a set target temperature (for example, 70 ° C.).

  Incidentally, although illustration is omitted, the terminal side control unit 11 and the heat source unit control unit 2D are communicatively connected via a communication line, and the terminal side control unit 11 performs heating operation with respect to the heat source unit control unit 2D. It is configured to command various information such as command information for commanding permission.

(Prevention of freezing of power generation section)
As shown in FIG. 1, the power generation unit Ha includes a first electric heater 46 that heats the cooling water circulation path 5A and a plurality of second electric heaters 47 that heat the hot water circulation path 5B.
Then, when any of the detected temperatures of a plurality of temperature detection sensors (not shown) for detecting the temperatures of the cooling water circulation path 5A and the hot water circulation path 5B is equal to or lower than the freezing prevention temperature (for example, 5 ° C.), the power generation control unit 6 operates the cooling water circulation pump Pa and the hot water circulation pump Pb and operates the first electric heater 46 and the second electric heater 47 so as to raise the temperature of the cooling water circulation path 5A and the hot water circulation path 5B. It is configured.

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

(About prevention of freezing of heat source)
As shown in FIG. 1, the heat source Hb includes a plurality of first heating channels 35, a first water supply channel 35 a, a second water supply channel 35 b, a multi-function circulation channel 36, a replenishment channel 40, and a hot water supply channel 43. Three electric heaters 48 are provided.
In addition, the auxiliary heat source device 2 is provided with a fourth electric heater 49 for heating the pipe line near the finned-tube heat exchange unit 2A.

  And the detected temperature of the several temperature detection sensor (not shown) which detects the temperature of the water supply path 35, the 1st water supply path 35a, the 2nd water supply path 35b, the multifunctional circulation path 36, the replenishment path 40, and the hot water supply path 43. When any of them becomes 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 channel 35, the first water supply channel 35a, the second water supply channel 35b, The multifunctional circulation path 36, the replenishment path 40, and the hot water supply path 43 are configured to be heated.

  Thereafter, the detected temperature of a 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 multifunction circulation passage 36, the replenishment 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 everything reaches a set end temperature (for example, 10 ° C.) higher than the freeze prevention temperature (for example, 5 ° C.) or higher. Yes.

  When the detection temperature of a temperature detection sensor (not shown) for detecting the temperature of the fin tube type heat exchanging part 2A in the auxiliary heat source unit 2 or the pipe part in the vicinity thereof becomes a freezing prevention temperature (for example, 5 ° C.) or less, The heat source machine control unit 2D is configured to operate the fourth electric heater 49 to raise the temperature of the fin tube type heat exchange unit 2A and a pipe line portion in the vicinity thereof.

  Thereafter, a detection end temperature (for example, 5 ° C.) of a temperature detection sensor (not shown) that detects the temperature of the fin-tube heat exchange unit 2A or a pipe line portion in the vicinity thereof is higher than the set temperature (for example, 5 ° C.) For example, when the temperature becomes 10 ° C. or higher, the heat source controller 2D is configured to stop the operation of the fourth electric heater 49.

(Details of the drive configuration of the 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.

In the present embodiment, the first drive circuit unit 51 and the third drive circuit unit 53 are connected to the U-phase extension Nu and the neutral extension No in the internal wiring N, and the second drive circuit unit 52 and The fourth drive circuit unit 54 is connected to the V-phase extension Nv and the neutral extension No in the internal wiring N.
And corresponding to each of the 1st drive circuit part 51, the 2nd drive circuit part 52, the 3rd drive circuit part 53, and the 4th drive circuit part 54, the 1st drive switch 51S which interrupts supply of electric power each separately, A second drive switch 52S, a third drive switch 53S, and a fourth drive switch 54S are provided, and the first drive switch 51S to the fourth drive switch 54S are intermittently operated according to a command from the power generation control unit 6. It is configured as follows.

  Therefore, the power generation control unit 6 intermittently operates the first drive switch 51S to the fourth drive switch 54S, thereby causing the cooling water circulation pump Pa, the hot water circulation pump Pb, the first electric heater 46, and the second electric heater 47, respectively. Can be switched between an operation state and an operation stop state.

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 the first terminal block 55A and the second terminal block 55B. 11 and the heat source machine control part 2D of the auxiliary heat source machine 2 are configured to be freely connectable.
As the first terminal block 55A is connected to the U-phase extension Nu and the neutral extension No in the internal wiring N, the U-phase side connection portion that outputs power from the U-phase line U to the outside is provided. Further, the second terminal block 55B is connected to the V-phase extension Nv and the neutral extension No in the internal wiring N, so that the power from the V-phase line is output to the outside. It is configured as a part.

A U-phase side switch 56A serving as a U-phase side interrupting portion for interrupting the connection between the first terminal block 55A and the internal wiring N, and a V-phase side interrupting portion for interrupting the connection between the second terminal block 55B and the internal wiring N. V-phase side switch 56B is provided, and these U-phase side switch 56A and V-phase side switch 56B are intermittently operated by command information commanded from the power generation control unit 6 by command lines. It is configured.
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, and similarly, the second terminal block 55A as the V-phase side connection portion. The terminal block 55B is configured to be switchable between an output action state and an output stop state by a V-phase side switch 56B.

The terminal side control unit 11 and the heat source unit control unit 2D are configured to be freely connectable to both 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 unit control unit 2D is connected to the second terminal block 55B.
Incidentally, the terminal side controller 11 and the heat source machine controller 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.

  In the present embodiment, the power generation control unit 6 and the heat source unit control unit 2D are connected by the communication line 58, and the power generation control unit 6 controls the heat source unit when performing a diagnosis process to be described later. Command information for operating the blower fan 2C and the fourth electric heater 49 is commanded to the section 2D.

(Details of heat source)
As shown in FIG. 2, the heat source Hb includes a multi-function circulation pump 20, a heating circulation pump 21, a bath tracking circulation pump 22, and a third electric heater 48 as a main body side electric device E <b> 1. The auxiliary heat source device 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.
In addition, the main body side electric device E1 and the auxiliary side electric device E2 are collectively referred to as an electric device Eb included in the heat source unit Hb.

Further, the terminal-side control in which the main body processing unit B1 communicates with the power generation control unit 6 via the communication line L in a 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 the part 11. FIG.
Further, the heat source machine control in which the auxiliary processing unit B2 communicates with the power generation control unit 6 via the communication line 58 in a 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 body processing unit B1 of the heat source unit Hb is connected to one of the first terminal block 55A and the second terminal block 55B and includes the main body side electric device E1 as the electric device Eb. The terminal side control unit 11 that communicates with the control unit 6 is provided.
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 the electric device Eb. It is comprised so that the heat source machine control part 2D communicated between the control part 6 for an operation 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 unit control unit 2D is connected to 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 power generation control unit)
The power generation control unit 6 selects the U-phase side electric load Eu connected to the U-phase line U and the V-phase side electric load Ev connected to the V-phase line V while the power generation of the fuel cell 4 is stopped. Thus, it is configured to execute a diagnosis process for diagnosing the installation state of the pair of current detection units D.
In the present embodiment, the power generation control unit 6 is configured to use the electric device Eb included in the heat source unit Hb as the U-phase side electric load Eu and the V-phase side electric load Ev.

  That is, the power generation control unit 6 connects the main body side electric device E1 of the main body processing unit B1 of the heat source unit Hb and the auxiliary side electric device E2 of the auxiliary processing unit to the U phase side electric load Eu connected to the U phase line U. The diagnostic processing is executed in a form used as the V-phase side electric load Ev connected to the V-phase line V.

  In addition, the power generation control unit 6 switches one of the first terminal block 55A and the second terminal block 55B to the output operation state and communicates with the terminal-side control unit 11 before the diagnosis process, When the main body processing unit B1 is connected to the first terminal block 55A and the connection confirmation process for determining whether the main body processing unit B1 is connected to the first terminal block 55A. 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 and the main body processing unit B1 is connected to the second terminal block 55B, the main body It is configured to execute a load setting process in which the 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.

  In other words, when the cogeneration unit H is installed, the power generation control unit 6 executes a test process that sequentially performs a connection confirmation process, a load setting process, and a diagnosis process by instructing a test command from the remote controller R. Is configured to do.

(Details of the test process)
Next, the test process executed by the power generation control unit 6 will be described based on the flowchart of FIG.
First, switch operation processing for turning ON the U-phase side switch 56A and turning OFF the V-phase side switch 56B is performed (# 1), and then test communication is executed with the terminal-side control unit 11 ( # 2) Thereafter, it is determined whether or not the test communication with the terminal-side control unit 11 is appropriate (# 3).

  Incidentally, the purpose of the test communication is to confirm whether or not the terminal-side control unit 11 is supplied with power from the first terminal block 55A by connecting the terminal-side control unit 11 to the first terminal block 55A. Therefore, for example, the power generation control unit 6 communicates response request information to the terminal side control unit 11, and the terminal side control unit 11 that has received the response request information receives the power generation control unit. When the response information is received from the terminal-side control unit 11, the power generation control unit 6 recognizes that the communication is appropriate.

  When it is determined in # 3 that the test communication is appropriate, 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. Thereafter, the process proceeds to a diagnosis process (# 9).

  If it is determined in # 3 that the test communication is not appropriate, a switch operation process for turning off the U-phase side switch 56A and turning on the V-phase side switch 56B is performed (# 5). Test communication is performed with the terminal-side control unit 11 (# 6), and then it is determined whether the test communication with the terminal-side control unit 11 is appropriate (# 7).

If it is determined in # 7 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. Thereafter, the process proceeds to a diagnosis process (# 9).
If it is determined at # 7 that the test communication is not appropriate, the remote control R is used because the main body processing unit B1 and the auxiliary processing unit B2 of the heat source unit Hb are not connected to the power generation unit Ha. Alarm processing such as displaying an abnormal state is executed (# 10).

  Incidentally, the processes of # 1 to # 3 and the processes of # 5 to # 7 described above correspond to the connection confirmation process, and the processes of # 4 and # 8 correspond to the load setting process.

(Details of diagnostic processing)
Next, diagnostic processing executed by the power generation control unit 6 will be described based on the flowchart of FIG.
First, the U-phase side electric load Eu is turned on, and the process of measuring the current values of the pair of current detection units D is executed (# 21).
That is, when the main body side electric device E1 is set to the U-phase side electric load Eu by the load setting process, the power generation control unit 6 causes the terminal side control unit 11 to operate the main body side electric device E1. , The terminal-side control unit 11 operates the main body-side electric device E1, and in this state, the current values of the pair of current detection units D are measured.

  Conversely, when the auxiliary electric device E2 is set to the U-phase electric load Eu by the load setting process, the power generation control unit 6 activates the auxiliary electric device E2 with respect to the heat source unit control unit 2D. By instructing this, the heat source device control unit 2D operates the auxiliary electric device E2, and in this state, the current values of the pair of current detection units D are measured.

Next, it is determined whether or not a change in the current value caused by turning on the U-phase side electric load Eu is detected by the first current detection unit D1 (# 22), and when a change in the current value is detected. Sets the first current detector D1 to the U-phase side (# 23).
Subsequently, it is determined whether or not the current value is a positive value (# 26). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 27). .

  By the way, the detection of the change in the current value due to the input of the U-phase side electric load Eu is applied to the absolute value of the current value before the U-phase side electric load Eu is input. It is detected whether or not the absolute value of the subsequent current value has changed more than the set value.

  In this case, an instantaneous value can be used as the current value before the U-phase side electric load Eu is turned on or the current value after the U-phase side electric load Eu is turned on. ) And an integrated value of a set time (for example, 1 second), and appropriately detecting a change in current value caused by applying the U-phase side electric load Eu while excluding the influence of disturbance. Can do.

In # 22, when the change in the current value due to the input of the U-phase side electric load Eu is not detected by the first current detector D1, the change in the current value due to the input of the U-phase side electric load Eu. Is detected by the second current detector D2 (# 24), and when a change in the current value is detected, the second current detector D2 is set to the U-phase side (# 25). ).
Subsequently, it is determined whether or not the current value is a positive value (# 26). If the current value is not a positive value (a negative value), the current value is set to be inverted (# 27). .

  In # 24, when the change in the current value due to turning on the U-phase side electric load Eu is not detected by the second current detection unit D2, it is an abnormality such as not installing the pair of current detection units D. Therefore, an alarm process such as displaying an abnormal state with the remote controller R is executed (# 35).

Next, the process of measuring the current value of the pair of current detectors D by applying the V-phase side electric load Ev is executed (# 28).
That is, when the main body side electric device E1 is set to the V-phase side electric load Ev by the load setting process, the power generation control unit 6 causes the terminal side control unit 11 to operate the main body side electric device E1. , The terminal-side control unit 11 operates the main body-side electric device E1, and in this state, the current values of the pair of current detection units D are measured.

  Conversely, when the auxiliary electric device E2 is set to the V-phase electric load Ev by the load setting process, the power generation control unit 6 activates the auxiliary electric device E2 with respect to the heat source unit control unit 2D. By instructing this, the heat source device control unit 2D operates the auxiliary electric device E2, and in this state, the current values of the pair of current detection units D are measured.

Next, it is determined whether or not a change in the current value caused by applying the V-phase side electric load Ev is detected by the first current detection unit D1 (# 29), and a change in the current value is detected. Sets the first current detection unit D1 to the V-phase side (# 30).
Subsequently, it is determined whether or not 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). .

In # 29, if the change in the current value due to the input of the V-phase side electric load Ev is not detected by the first current detector D1, the change in the current value due to the input of the V-phase side electric load Ev. Is detected by the second current detector D2 (# 31), and when a change in the current value is detected, the second current detector D2 is set to the V-phase side (# 32). ).
Subsequently, it is determined whether or not 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). .

  In # 31, when the change in the current value due to turning on the U-phase side electric load Eu is not detected by the second current detection unit D2, it is an abnormality such as not installing the pair of current detection units D. Therefore, an alarm process such as displaying an abnormal state with the remote controller R is executed (# 35).

(Summary of the first embodiment)
As described above, the electric equipment Eb equipped in the heat source part Hb as the exhaust heat recovery and consumption part is used for the U-phase side electric load Eu connected to the U-phase line U and the V-phase side electric load connected to the V-phase line V. Since the diagnostic process is performed while being used as Ev, the diagnostic process can be performed satisfactorily while using the electric device Eb equipped in the heat source unit Hb.

  That is, one of the main body side electric device E1 and the auxiliary electric device E2 as the electric device Eb equipped in the heat source unit Hb is used as the U-phase side electric load Eu, and the main body side electric device E1 and the auxiliary electric device Eb are used. The diagnostic process can be performed satisfactorily while using the other of the side electric devices E2 as the V-phase side electric load Ev.

  In addition, the main body processing unit B1 of the heat source unit Hb is connected to the first terminal block 55A as the U-phase side connection unit and the second terminal block 55B as the V-phase side connection unit by the connection confirmation process executed before the diagnosis process. A load setting process for determining which one is connected and distributing the main body side electric device E1 and the auxiliary side electric device E2 to the U-phase side electric load Eu and the V-phase side electric load Ev based on the determination result Therefore, even if the main body processing unit B1 is connected to either the first terminal block 55A or the second terminal block 55B, the main body side electric device E1 and the auxiliary side electric device E2 are connected to the U-phase side electric device. Since the load Eu and the V-phase side electric load Ev can be appropriately determined, the diagnosis process can be performed accurately.

[Second Embodiment]
Next, the second embodiment will be described. This second embodiment shows another embodiment of the test process executed by the power generation control unit 6, and other configurations are the same as those of the first embodiment. Therefore, only a different part from 1st Embodiment is demonstrated, and detailed description is abbreviate | omitted about the structure similar to 1st Embodiment.

  In the second embodiment, as the U-phase side electric load Eu, the main body side electric device E1 provided in the main body processing unit B1 of the heat source unit Hb is used, and as the V phase side electric load Ev, the electric device provided in the power generation unit Ha is used. It is comprised so that a diagnostic process may be performed with the form to be used.

  In the present embodiment, among the electric devices included in the power generation unit Ha, the second drive circuit unit 52 drives the hot water circulation pump Pb that becomes a large electric load, and the fourth drive circuit unit 54 becomes a large electric load. In view of the fact that the plurality of second electric heaters 47 are driven, the second drive circuit unit 52 and the fourth drive circuit connected to the V-phase extension Nv and the neutral extension No of the power generation unit Ha. The unit 54 is configured to be used as the V-phase side electric load Ev.

  That is, first, the power generation control unit 6 switches between one of the first terminal block 55A and the second terminal block 55B to the output operation state and communicates with the terminal-side control unit 11 before the diagnosis process. Thus, a connection confirmation process is performed to determine whether the main body processing unit B1 is connected to the first terminal block 55A or the second terminal block 55B.

  In the unlikely event that the power generation control unit 6 is connected to the second terminal block 55B, a comment that prompts the user to replace the power generation control unit 6 with the first terminal block 55A is provided on the remote controller R, etc. The notification process is executed.

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

  Thereafter, as in the first embodiment, a diagnostic process for diagnosing the installation state of the pair of current detection units D is performed while selectively acting on the U-phase side electrical load Eu and the V-phase side electrical load Ev.

  That is, a test in which the power generation control unit 6 sequentially performs a connection confirmation process, a notification process, a load setting process, and a diagnosis process by instructing a test command from the remote controller R when the cogeneration unit H is installed. It is configured to perform processing.

(Summary of the second embodiment)
In the second embodiment, diagnostic processing is performed while using the electric equipment Eb equipped in the heat source unit Hb as the exhaust heat recovery and consumption unit as the U-phase side electric load Eu connected to the U-phase line U. Therefore, the diagnostic process can be performed satisfactorily while using the electric device Eb equipped in the heat source unit Hb.

  That is, the second drive circuit unit 52 and the fourth drive circuit unit that use the main body side electrical device E1 as the electrical device Eb equipped in the heat source unit Hb as the U-phase side electrical load Eu and that the power generation unit Ha equips. The diagnostic process can be performed satisfactorily while using 54 as the V-phase side electric load Ev.

  Further, the connection confirmation process and the notification process that are executed before the diagnosis process reveal a state in which the main body processing unit B1 of the heat source unit Hb is accurately connected to the first terminal block 55A. Diagnosis processing can be performed accurately while appropriately determining the load Eu and the V-phase side electric load Ev.

[Another embodiment]
Next, other embodiments are listed.
(1) In the first and second embodiments, the operation control unit C that controls the operation of the combined heat and power supply unit H controls the operation of the power generation control unit 6 that controls the operation of the power generation unit Ha and the operation of the heat source unit Hb. However, the power generation control unit 6 and the terminal side control unit 11 are combined as one control unit, and the operation control unit C is configured as one control unit. You may implement with a form.

(2) In the first and second embodiments, the power generation unit Ha and the heat source unit Hb are illustrated as separate units. However, the power generation unit Ha and the heat source unit Hb are configured as a single unit. You may implement with the form to do.

(3) In the first and second embodiments, the case where the power generation unit Ha includes the fuel cell 4 is exemplified. However, the power generation unit Ha is driven by an engine that operates with fuel gas and the engine. The present invention can also be applied to a case where a generator is provided.

(4) In the first and second embodiments, as the diagnostic process, while the U-phase side electrical load Eu and the V-phase side electrical load Ev are selectively applied, the installation state of the pair of current detection units D, 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 of the pair of current detection units D Although the case where it performs is illustrated, for example, before making the U-phase side electric load Eu and the V-phase side electric load Ev act, a pair of current detection is performed based on the flow direction of the current detected by the pair of current detection units D Each of the pair of current detection units D performs a U-phase signal line while selectively activating the U-phase side electrical load Eu and the V-phase side electrical load Ev. Diagnose which of the Su and V phase signal lines Sv is installed Etc. To Migihitsuji, specific configuration of the diagnostic process can various modifications.

(5) In the first and second embodiments, the case where the U-phase side electrical load Eu and the V-phase side electrical load Ev are set to a constant load in the diagnosis process is illustrated, but before performing the diagnosis process, Based on the detection values of the pair of current detection units D, the current value flowing through the U-phase signal line Su and the V-phase signal line Sv is detected by the electric load 10, and the larger the current value (absolute value) is, the larger the current value is. In the diagnosis process, such as changing the U-phase side electrical load Eu and the V-phase side electrical load Ev by increasing the U-phase side electrical load Eu and the V-phase side electrical load Ev, the U-phase side You may make it change the magnitude | size of the electric load Eu and the V-phase side electric load Ev.

  The configuration disclosed in the above embodiment (including another embodiment, the same shall apply hereinafter) can be applied in combination with the configuration disclosed in the other embodiment, as long as no contradiction occurs. The embodiment disclosed in this specification is an exemplification, and the embodiment of the present invention is not limited to this. The embodiment can be appropriately modified without departing from the object of the present invention.

7 Commercial power supply 55A U-phase side connection portion 55B V-phase side connection portion 56A U-phase side interruption portion 56B V-phase side interruption portion B1 Main body processing portion B2 Auxiliary processing portion C Operation control portion D Current detection portion Ha Power generation portion Hb Waste heat recovery Consumption part U U phase wire V V phase wire E1 Main body side electric device E2 Auxiliary side electric device Eb Electric device Eu U phase side electric load Ev V phase side electric load

Claims (1)

A power generation unit interconnected with a single-phase three-wire commercial power source, a waste heat recovery and consumption unit that recovers and consumes exhaust heat of the power generation unit, and a U-phase line and a V-phase line of the commercial power source, respectively A pair of current detection units installed separately, and a power generation control unit for controlling the operation of the power generation unit,
The power generation control unit selectively operates the U-phase side electrical load connected to the U-phase line and the V-phase side electrical load connected to the V-phase line, and the pair of current detection units are installed. A combined heat and power system configured to execute a diagnostic process for diagnosing a condition,
The exhaust heat recovery and consumption unit is provided in a form including an electrical device connected to the U-phase line or the V-phase line,
The power generation control unit executes the diagnosis process in a form using the electric device included in the exhaust heat recovery and consumption unit as at least one of the U-phase side electric load and the V-phase side electric load. Composed of
The power generation unit is provided with a U-phase side connection unit that outputs power from the U-phase line to the outside, and a V-phase side connection unit that outputs power from the V-phase line to the outside.
The waste heat recovery and consumption part is connected to one of the U-phase side connection part and the V-phase side connection part and includes a main body side electric device as the electric device, the U phase side connection part, and the It is comprised in the form provided with the auxiliary processing part which is an auxiliary heat source machine which is connected to the other of the V phase side connection part, and is provided with auxiliary side electric equipment as the electric equipment,
The power generation control unit is configured to execute the diagnostic processing in a form in which the main body side electric device and the auxiliary side electric device are used as the U phase side electric load and the V phase side electric load,
The U-phase side connecting portion and the V-phase side connecting portion can be switched between an output action state and an output stop by a U-phase side intermittent portion and a V-phase side intermittent portion that can be intermittently operated by the power generation control portion. Configured,
The main body processing unit is configured to include a terminal-side control unit that communicates with the power generation control unit in a power supply state by connection with the U-phase side connection unit and the V-phase side connection unit,
The power generation control unit communicates with the terminal-side control unit by switching one of the U-phase side connection unit and the V-phase side connection unit to the output operation state before the diagnosis process. A connection confirmation process for determining whether the main body processing unit is connected to the U-phase side connection unit or the V-phase side connection unit; and the main body processing unit is connected to the U-phase side connection unit In this case, the main body side electric device is set as the U-phase side electric load, the auxiliary side electric device is set as the V phase side electric load, and the main body processing unit is connected to the V phase side connection portion. In this case, the combined heat and power system is configured to execute a load setting process in which the main body-side electric device is set to the V-phase side electric load and the auxiliary-side electric device is set to the U-phase side electric load .

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