JP5239583B2 - Cogeneration system - Google Patents

Description

  The present invention relates to a cogeneration system.

The cogeneration system includes a power generation device that supplies power to the load device, an operation control device that controls the power generation device so that the power generation amount corresponds to the power generation amount instruction value, and hot water that recovers waste heat from the power generation device. One having a hot water storage tank for storing hot water is known. As an example of this cogeneration system, there is a cogeneration system disclosed in Patent Document 1. This cogeneration system predicts the amount of hot water and hot water consumption for one day. If there is too much hot water, it switches to control that stops power generation once a day. Switch to control that does not stop power generation.
JP 2005-38676 A

  In the cogeneration system described in Patent Document 1, when irregular hot water consumption occurs or when hot water runs out, it is necessary to replenish hot water with a separate system such as a gas water heater or an electric water heater. The effect was getting worse. In addition, there is a problem that when there is a surplus of hot water at night, the heat dissipation loss is large and the energy saving effect is reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cogeneration system that can control the operation of a power generation device that has a high energy-saving effect by preventing running out of hot water and excess water.

In order to solve the above-mentioned problem, the structural feature of the invention according to claim 1 is that a power generation device that supplies power to a load device, hot water that recovers waste heat of the power generation device, and hot water storage device that stores hot water. A hot water tank for supplying hot water, a pre-designated operation stop time, a consumption pattern of the amount of hot water consumed by the hot water use device, a predicted value of the remaining hot water amount in the hot water tank, and consumption by the hot water use device for the day An operation control device that performs power generation control or power generation stop control on the power generation device based on the consumption data of the amount of hot and cold water, and the operation control device has a consumption pattern of the amount of hot water consumed by the hot water use device. , Divided into first data on the amount of hot water consumed during the specified operation stop time and second data on the amount of hot water consumed during operation times other than the operation stop time. Ru Subtracting the amount of hot water consumed by the hot water usage device from the start of the day to the present from the second data of the amount of hot water, the first data of the amount of hot water consumed during the operation stop time to the subtraction value Is added to obtain a threshold value, and when the threshold value becomes larger than the predicted value of the remaining hot water amount in the hot water storage tank during the operation time, the power generation control of the power generation device is continued. It is to stop control .

  In addition, the structural feature of the invention according to claim 2 is that in claim 1, the operation control device stores the amount of hot water consumed by the hot water usage device up to a certain period of time for each time zone and stores the consumption. A pattern is created, and control is performed based on the data of the day when the amount of hot water consumed by the hot water usage apparatus becomes the maximum amount.

In the invention which concerns on Claim 1 comprised as mentioned above, the operation control apparatus is the operation stop time designated beforehand, the consumption pattern of the amount of hot water consumed by the hot water use apparatus, and the predicted value of the amount of remaining hot water in the hot water tank. And based on the consumption data of the amount of hot water consumed by the hot water usage device on the day, the power generation device is subjected to power generation control or power generation stop control. As a result, power generation can be controlled so that hot water is stored in the hot water tank as much as necessary, and power generation can be stopped so that hot water is not stored in the hot water tank more than necessary. It is possible to provide a cogeneration system capable of operating a power generation device with high energy saving effect. Further, the operation control device consumes the consumption pattern of the hot water amount consumed by the hot water use device during the operation time other than the first data of the hot water amount consumed during the operation stop time specified by the input and the operation stop time. And subtracting the amount of hot water consumed by the hot water usage apparatus from the start of the day to the present day from the second data of the amount of hot water consumed during the operation time. The first data of the amount of hot water consumed during the operation stop time is added to the value as a threshold value. When the threshold value becomes larger than the predicted value of the remaining hot water amount in the hot water tank during the operation time, the power generation control of the power generator Since the power generation device is controlled to stop power generation when it becomes smaller, irregular hot water consumption occurs, especially when hot water consumption time is earlier than usual, It can be surely prevented.

  In the invention according to claim 2 configured as described above, in the invention according to claim 1, the operation control device stores the amount of hot water consumed by the hot water use device up to a certain period before every time period. Since a consumption pattern is created and controlled based on the data on the day when the amount of hot water consumed by the hot water usage device is the maximum, even if irregular hot water consumption occurs, The remaining hot water can be almost certainly prevented.

  Hereinafter, an embodiment of a cogeneration system according to the present invention will be described. FIG. 1 is a schematic diagram showing an overview of this cogeneration system. This cogeneration system has a power generation device 10 that supplies power to the load device 21, a hot water storage tank 30 that stores hot water from which waste heat of the power generation device 10 has been collected, and a power generation amount that corresponds to the power generation amount instruction value. An operation control device 40 that controls the power generation device 10 and controls the power generation device 10 to perform power generation control or power generation stoppage so that the amount of power generation corresponds to a power generation instruction value that does not cause excess or hot water in the hot water tank 30. ing.

  The power generation device 10 is a fuel cell power generation device, and includes a power generator 11 that generates DC power, and a converter (for example, an inverter) 12 that converts the DC power supplied from the power generator 11 into AC power and outputs the AC power. ing. In addition to the fuel cell power generation device, the power generation device 10 may be configured by a prime mover such as a diesel engine, a gas engine, a gas turbine, or a micro gas turbine, and a generator driven by the prime mover.

  The generator 11 includes a reformer, a carbon monoxide reduction device (hereinafter referred to as a CO reduction device), and a fuel cell. In the reformer, the fuel supplied from the fuel supply device 13 is steam-reformed with water supplied from the water supply device 14 to generate a hydrogen-rich reformed gas, which is led to the CO reduction device. The CO reduction device reduces carbon monoxide contained in the reformed gas and leads it to the fuel cell. The fuel cell generates power using hydrogen in the reformed gas supplied to the fuel electrode and air that is an oxidant gas supplied to the air electrode.

  Between the fuel supply device 13 and the power generator 11, a flow meter 13a serving as a fuel input amount detecting means for detecting the amount of fuel input to the power generator 11 is provided. The flow meter 13a detects the detected fuel input amount. Is transmitted to the operation control device 40. Note that the amount of fuel input in the case of a fuel cell power generator refers to the amount of fuel supplied to the reformer.

  The converter 12 is connected to a plurality of load devices 21 installed at the power use place 20 via the power transmission line 15, and the AC power output from the converter 12 is supplied to each load device 21 as necessary. Has been supplied to. The converter 12 is provided with a wattmeter 10a that is a power generation output amount detecting means for detecting the power generation output amount output from the power generation device 10, and the wattmeter 10a sends the detected power generation output amount to the operation control device 40. It is supposed to send.

  The load device 21 is an electric appliance such as an electric lamp, iron, television, washing machine, electric kotatsu, electric carpet, air conditioner, and refrigerator. In addition, the power source 15 of the power company is also connected to the power transmission line 15 that connects the converter 12 and the power use place 20 (system connection), and the total power consumption of the load device 21 is determined by the power generation amount of the power generation device 10. When the amount exceeds, the insufficient power is received from the system power supply 16 and compensated. The wattmeter 22 is power consumption detection means for detecting the power consumption consumed by the load device 21, detects the total power consumption of all the load devices 21 used in the power usage place 20, This is transmitted to the operation control device 40.

  The generator 11 is connected to a cooling circuit 31 through which a heat medium that recovers waste heat of the generator 11 and cools the generator 11 circulates. On the cooling circuit 31, a heat exchanger 32 and a radiator 37 are disposed. The radiator 37 is a cooling means for cooling the heat medium circulating in the cooling circuit 31, and is controlled to be turned on / off by a command from the operation control device 40. The heat medium is cooled in the on state and cooled in the off state. It is something that does not.

  On the other hand, a hot water circulation circuit 33 for heating hot water (hot water) in the hot water tank 30 is connected to the hot water tank 30 described later. A heat exchanger 32 is disposed on the hot water circulation circuit 33. The heat exchanger 32 performs heat exchange between the heat medium circulating in the cooling circuit 31 and the hot water circulating in the hot water circulation circuit 33. As a result, a pump (not shown) is driven during power generation by the power generator 11, and the heat medium circulates in the cooling circuit 31, and hot water circulates in the hot water circulation circuit 33. The hot water is recovered as hot water through the vessel 32 and heated. The waste heat of the power generator 11 refers to, for example, the waste heat of the fuel cell stack or the waste heat of the reformer in the case of a fuel cell power generator, and the waste heat of the engine in the case of an engine power generator. However, not limited to this, any recoverable waste heat such as the heat of the generator itself can be used.

  The hot water tank 30 is provided with one columnar container, in which hot water is stored in a layered manner, that is, hot water in the upper part is the hottest and becomes lower as it goes to the lower part, and the hot water in the lower part is stored at the lowest temperature. It has become so. Hot water stored in the hot water tank 30 is derived from the upper part of the columnar container of the hot water tank 30, and water such as tap water from the water supply device 14 (low temperature water) so as to replenish the derived amount. Is introduced from the lower part of the columnar container of the hot water tank 30. Such a hot water tank 30 is installed near the power generation apparatus 10.

  Inside the hot water tank 30, a temperature sensor group 34 that is a remaining hot water amount detection sensor is provided. The temperature sensor group 34 includes a plurality (ten in the present embodiment) of temperature sensors 34-1, 34-2, 34-3,..., 34-10, and is arranged in the vertical direction (vertical direction). It is arranged at equal intervals (distance of 1/9 of the vertical height in the hot water tank 30). The temperature sensor 34-1 is disposed on the inner upper surface of the hot water tank 30. Each of the temperature sensors 34-1, 34-2, 34-3,..., 34-10 detects the temperature of the liquid (hot water or water) in the hot water storage tank 30 at that position. The amount of remaining hot water in the hot water storage tank 30 is derived based on the detection result of the hot water temperature at each position by the temperature sensor group 34. The remaining hot water amount represents the amount of heat stored in the hot water tank 30. Between the hot water storage tank 30 and the water supply device 14, a temperature sensor 38 that detects the temperature of water (for example, tap water) supplied to the hot water storage tank 30 is provided. The detection result (tap water temperature) of the temperature sensor 38 is transmitted to the operation control device 40.

  A hot water supply pipe 35 is connected to the hot water tank 30. In the hot water supply pipe 35, a flow rate sensor 36, a gas water heater (not shown), which is an auxiliary heating device, and a temperature sensor (not shown) are arranged in order from the hot water tank 30 side. The flow rate sensor 36 detects the amount of hot water consumption (hot water supply amount) supplied from the hot water storage tank 30. A detection signal of the flow sensor 36 is transmitted to the operation control device 40. Moreover, although not shown in figure, the tap water from the water supply apparatus 14 joins the hot water supply pipe 35 between a gas water heater and a temperature sensor. Thereby, the temperature of the hot water from the hot water tank 30 is lowered. The gas water heater heats hot water from the hot water storage tank 30 passing through the hot water supply pipe 35 to supply hot water. The temperature sensor detects the temperature of the hot water after passing through the gas water heater or after the tap water from the water supply device 14 joins, and the detection signal is transmitted to the operation control device 40. Yes. That is, the hot water detected by the temperature sensor is heated by the gas water heater or the temperature is lowered by tap water from the water supply device 14 so that the set hot water temperature becomes the set hot water temperature.

  Connected to the hot water supply pipe 35 are a plurality of hot water use devices 26a installed in a hot water use place 25 that uses hot water stored in the hot water tank 30 as hot water supply. Examples of the hot water use device 26a include a bathtub, a shower, a kitchen (kitchen faucet), and a washroom (toilet faucet). The hot water supply pipe 35 is connected to a heat utilization device 26b installed in a hot water use place 25 that uses hot water in the hot water tank 30 as a heat source. Examples of the heat utilization device 26b include bathroom heating, floor heating, and a hot water reheating mechanism. The heat utilization device 26b may use the hot water in the hot water tank 30 directly or indirectly use the hot water in the hot water tank 30. The hot water use device 26a and the heat use device 26b are hot water use devices.

  The operation control device 40 has a microcomputer (not shown), and the microcomputer includes an input / output interface, a CPU, a RAM, and a ROM (all not shown) connected via a bus. The CPU executes a program corresponding to the flowchart of FIG. 2 and the like, derives and updates the operation plan of the power generation apparatus 10, operates according to the updated operation plan, and operates according to the power generation amount instruction value. Thus, the power generation apparatus 10 is controlled to continuously generate power or stop generating power. The RAM temporarily stores variables necessary for executing the program, and the ROM stores the program.

  Next, operation modes of the above-described cogeneration system will be described with reference to FIGS. It should be noted that the user can designate a forced operation stop time in advance in the operation control device 40 as a noise prevention measure for the neighborhood when operating this cogeneration system. For this reason, in the following description, it is assumed that 0:00 to 6:00 is set as the forced operation stop time. When the main power supply (not shown) is turned on, the operation control device 40 starts the program in step 100 and advances the program to step 102. The operation control device 40 sets an operation plan once a day by the processing of steps 102 to 108 shown in FIG. 2, and stops the operation (power generation) of the power generation device 10 or generates power according to the operation plan.

  In step 102, the operation control device 40 creates and updates hot water consumption patterns based on, for example, hot water consumption data from 7 days ago to the previous day. Here, for example, the hot water consumption data of the previous day is created by executing steps 302 to 318 of FIG. 3 simultaneously while executing steps 102 to 108 of FIG. 2 on the previous day. The generated hot water consumption data on the previous day is used in step 102 of FIG. Hereinafter, the hot water consumption pattern creation routine shown in FIG. 3 will be described.

  The operation control device 40 initializes a matrix Ho_m for creating a hot water consumption pattern (step 302). The operation control device 40 substitutes the hot water consumption for each time zone for 7 days into each element of the matrix Ho_m. An example of the result of substitution is shown in FIG. At the beginning of installation of this system, a numerical value of an average consumption model pattern created in advance based on conditions such as family composition and region is substituted. Also, after at least one week of operation, the previous hot water consumption pattern value created and updated from the actually measured hot water consumption is substituted.

  In the matrix Ho_m, the column indicates how many days ago the data is, and the row indicates the time zone of the day. The hot water consumption is expressed as the amount of power generated to produce the hot water. The display of the power generation amount is represented by the average wattage (average power generation) during that period. In this embodiment, since the period for calculating the hot water consumption is 30 minutes, for example, when the hot water consumption is 300 W, 300 W × 1 / 2h = 150 Wh is the amount of power generation required to produce hot water corresponding to the hot water consumption. Become. For example, the element of 1 row and 1 column of the matrix Ho_m is an average value of hot water consumption measured at 0:00 seven days ago, that is, an average value of hot water consumption measured from 23:30 eight days ago to 0:00 seven days ago. In FIG. 4, it is 300 W. The element in 2 rows and 1 column is the hot water consumption measured at 0:30 seven days ago, that is, the average value of the hot water consumption measured from 0:00 to 0:30 seven days ago, and is 400 W in FIG. . The element in the first row and the seventh column is an average value of hot water consumption measured at 0:00 one day ago, that is, an average value of hot water consumption measured from 23:30 two days ago to 0:00 one day ago. 340W.

  The operation control device 40 measures the hot water consumption by the flow rate sensor 36 every control cycle (1 minute in this embodiment) (step 304), and filters the measured hot water consumption (step 306). In step 306, the operation control device 40 performs the following equation 1 based on the measured data and the stored data for the past several cases (29 in this embodiment) each time the hot water consumption is measured. Filtering is being executed.

  U [k] and y [k] are current data, for example, input data and output values (process values) at time k, and z is a delay operator.

  The operation control device 40 continues to determine “NO” in step 308 until 30 minutes have elapsed from the start of measurement of hot water consumption, repeatedly execute the measurement of the hot water consumption and its filter processing, The average value is calculated by filtering hot water consumption for 30 minutes. Then, the operation control device 40 determines “YES” in step 308 when 30 minutes have elapsed from the measurement start time of the hot water consumption, and 1 from 3:00 to 23:30 that is different from the matrix Ho_m. An average value of consumption of hot water and water consumed in each 30 minutes is added to the matrix Ho_temp having 48 rows and columns every 30 minutes (step 310). The hot water consumption consumed in 30 minutes is measured and filtered every minute, and sequentially written in the matrix Ho_temp as hot water consumption at the time when 30 minutes have passed, and finally every 30 minutes one day before A matrix Ho_temp having one column and 48 rows from 0:00 to 23:30 indicating hot water consumption is created.

  The operation control device 40 continues to determine “NO” in step 312 until 0:00, and repeatedly executes the processing from step 304 to step 310. Then, when the time reaches 0:00, the operation control device 40 determines “YES” in step 312 and erases all data in the column Ho_m from the previous seven days (step 314). For example, as shown in FIG. 5, all data 300W, 400W... 900W from 0:00 to 23:30 seven days ago are erased. Then, as shown in FIG. 5, the operation control device 40 moves all the data one day before the seven columns from the all data six days before the two columns to the left one column at a time, and recorded in the matrix Ho_temp in step 310 for 30 minutes. All the data 200 W, 350 W... 800 W one day before the average value of the hot water consumption in are added to 7 empty columns of the matrix Ho_m (step 316). The operation control device 40 adds the data of each column of the matrix Ho_m created in this manner, and derives a hot water consumption pattern with the data having the maximum sum as the hot water consumption predicted value Ho_pre as shown in FIG. The update is stored (step 318). The hot water consumption at 0:00 is 350 W, the hot water consumption at 0:30 is 490 W,..., And the hot water consumption at 23:30 is 940 W. An example of this hot water consumption pattern is shown in FIG.

  Next, in step 104, the operation control device 40 executes a program in accordance with the hot water tank remaining hot water amount estimation routine shown in FIG. 7, and derives and stores the remaining hot water amount of the hot water storage tank 30 at the current time. The operation control device 40 measures the temperature of water (for example, tap water) supplied to the hot water tank 30 by the temperature sensor 38 (step 402). The operation control device 40 measures the temperature of the hot water at each position in the hot water tank 30 by the temperature sensors 34-1 to 34-10 (step 404). Then, the operation control device 40 substitutes the temperature of the water to be supplied and the temperature at each position in the hot water storage tank 30 into the following equation 2 to derive the remaining hot water amount in the hot water storage tank 30 (step 406).

Here, Q is the amount of heat [J] stored in the hot water tank 30, Cp is the specific heat of water (4.189 × 10 ⁻³ [J / (kg · K)]), and V is the hot water tank. The volume is 30 (150 l = 150 kg in the present embodiment), Tw is the temperature [° C.] of tap water, and Ti is the temperature [° C.] of the i-th temperature sensor 34 in the hot water tank 30.

  Next, the operation control apparatus 40 calculates | requires the hot water consumption from the start (0:00) of the day to the present in step 106. FIG. That is, the operation control device 40 detects the detected temperature of the uppermost temperature sensor 34-1 of the hot water tank 30 and the flow rate sensor 36 every predetermined time (in this embodiment, 30 minutes) from the start (0:00) of the day to the present. A hot water consumption integrated value is calculated based on a value obtained by integrating the detected flow rate.

  Next, in step 108, the operation control device 40 executes the program in accordance with the operation plan routine shown in FIG. 9, and switches between the power generation stop control and the power generation control in preparation for irregular hot water consumption. The operation of the power generation apparatus 10 having a high energy saving effect is controlled by preventing the hot water in the hot water tank 30 from running out or remaining hot water.

  The operation control device 40 reads the hot water consumption predicted value Ho_pre derived in step 102 (step 318), and sums up the hot water consumption predicted values for the operation stop time (0: 00 to 6:00) (total value A). The hot water consumption predicted values for the operation time (6:00 to 24:00) are summed (summed value B) (steps 702 and 704). An example of the derived hot water consumption prediction value Ho_pre and the predicted hot water consumption value of the operation stop time and the operation time is shown in FIG. Furthermore, the hot water consumption integrated value (integrated value C) from the start (0:00) of the day obtained in step 106 to the present is read (step 706). Then, the integrated value C is subtracted from the total value B (note that when the subtracted value obtained by subtracting the integrated value C from the total value B becomes negative), the total value A is added to set the threshold value S. Determination (step 708), it is determined whether or not the remaining hot water amount of the hot water storage tank 30 determined in step 104 is smaller than the threshold value S (step 710). When the remaining hot water amount in the hot water storage tank 30 is less than the threshold value S, the operation control device 40 determines “YES” in step 710 and advances the program to step 712 to control the power generation device 10 to generate electric power. When the amount of hot water is greater than the threshold value S, it is determined as “NO” in step 710, the program proceeds to step 714, the power generation amount instruction value is set to 0, and the power generation apparatus 10 is controlled to stop power generation.

  In step 712, the operation control device 40 measures the power consumption for each control cycle by the wattmeter 22, and filters the measured power consumption. This filtering process is performed each time the power consumption is measured, and based on the measured data and stored data for the past several cases (six cases in the present embodiment), the following number 3 similar to the above number 1. The filtering process is executed. The operation control device 40 sets the filter processing value as a power generation amount instruction value, and instructs the power generator 11 to output the power generation amount instruction value to perform power generation control of the power generation device 10. The upper and lower limits of the power generation amount instruction value are the maximum power generation amount (for example, 1500 W) and the minimum power generation amount (for example, 750 W) of the power generation apparatus 10. Thereby, since the electric power generating apparatus 10 can suppress the vibration of electric power generation amount, without tracking the electric power consumption which changes rapidly, efficient electric power generation is attained.

  Here, y [k] is a filtered value at k time (time), u [k] is power consumption [J] at k time (time), z is a delay operator, n is the filter order (5 in this embodiment).

  As described above, the power generation stop control is performed by comparing the threshold value S with the remaining hot water amount in the hot water storage tank 30, or the power generation control is continued. For example, as shown in FIG. 11, the power generation is stopped between 17:00 and 24:00 (the operation is forcibly stopped from 0:00 to 6:00), so the power generation amount is 0, From 1:00 to 17:00, power is generated following the power consumption. The threshold value S is first calculated from the hot water consumption predicted value Ho_pre by subtracting the hot water consumption integrated value from the start of the day (0:00) to the present time from the hot water consumption predicted value obtained from the hot water consumption predicted value Ho_pre, and then from the hot water consumption predicted value Ho_pre. Since the hot water consumption predicted value for the operation stop time is added, the hot water consumption predicted value for the operation stop time always remains. Thereby, even if irregular hot water consumption occurs, it is possible to control the operation of the power generation apparatus 10 with a high energy saving effect by preventing the hot water in the hot water tank 30 from running out or excessive hot water.

  As is apparent from the above description, in the present embodiment, the operation control device 40 has a predetermined operation stop time, a consumption pattern of the amount of hot water consumed by the hot water use devices 26a and 26b, and the hot water storage tank 30. Based on the predicted value of the remaining hot water amount and consumption data of the amount of hot water consumed by the hot water usage devices 26a and 26b on the day, the power generation device 10 is subjected to power generation control or power generation stop control. Thereby, since the operation plan which considered the heat radiation in the hot water storage tank 30 can be made, the hot water does not accumulate in the hot water storage tank 30 when the hot water is not used. Therefore, the cogeneration system which can drive | operate the electric power generating apparatus 10 with a high energy-saving effect by the amount of heat dissipation loss can be provided. Moreover, since an operation plan can be made more frequently than in the past, even when unexpected hot water is consumed, operation corresponding to the consumption can be performed. Therefore, since it is possible to prevent the occurrence of hot water due to unexpected consumption of hot water, it is possible to provide a cogeneration system capable of operating the power generator with good energy saving effect while preventing hot water from running out.

  Further, the operation control device 40 stores the amount of hot water consumed by the hot water use devices 26a and 26b up to a predetermined period for each time zone to create a consumption pattern, and the hot water consumed by the hot water use devices 26a and 26b. Since the control is based on the data on the day when the amount of water reaches the maximum amount, even if irregular hot water consumption occurs, it is possible to almost certainly prevent hot water runs out and excess water.

  Further, the operation control device 40 sets the consumption pattern of the amount of hot water consumed by the hot water usage devices 26a and 26b to the first data of the amount of hot water consumed during the specified operation stop time and the operation other than the operation stop time. The amount of hot water consumed by the hot water use devices 26a and 26b from the start of the day to the present is divided into the second data of the amount of hot water consumed during the time and the second data of the hot water consumed during the operation time. The data is subtracted, and the first data of the amount of hot water consumed during the operation stop time is added to the subtraction value to obtain a threshold value, and the threshold value becomes larger than the predicted value of the remaining hot water amount in the hot water tank 30 during the operation time. If the power generation control of the power generation device 10 is continued and the power generation device 10 becomes smaller, the power generation device 10 is controlled to stop power generation. Therefore, when irregular hot water consumption occurs, especially when the hot water consumption time is earlier than usual. Even if you almost run out of water It is possible to really prevent.

  In the above-described embodiment, the consumption pattern of hot water is selected such that the sum of data for one day out of seven days is the maximum, but the maximum value is selected for each time slot. Alternatively, an average value for 7 days may be selected. Further, the consumption pattern of the electric energy, the consumption pattern of the hot water, and the predicted value of the remaining hot water may be created in units of time longer than 24 hours (for example, 2 days). Further, as the power generation device 10, there is a power generation device 11 in which the power generator 11 generates AC power and directly outputs it without going through the exchanger 12.

It is a schematic diagram showing an outline of one embodiment of a cogeneration system according to the present invention. It is a flowchart of the control program performed with the operation control apparatus shown in FIG. It is a flowchart of the hot water consumption pattern creation routine performed with the operation control apparatus shown in FIG. It is a figure which shows matrix Ho_m. It is the figure which shows the update condition of the matrix Ho_m, and the figure which showed the hot water consumption estimated value by the matrix Ho_pre. It is a graph which shows an example of the hot water consumption pattern. It is a flowchart of the hot water storage tank remaining hot water amount estimation routine performed with the operation control apparatus shown in FIG. It is a flowchart of the driving | running plan routine performed with the driving | running control apparatus shown in FIG. It is a figure which shows how to obtain | require the hot water consumption predicted value of the operation stop time and operation time by matrix Ho_pre. It is a graph which shows the electric power consumption and electric power generation which are fluctuate | varied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Power generation device, 10a ... Wattmeter, 11 ... Generator, 12 ... Converter, 13 ... Fuel supply device, 13a ... Flow meter, 14 ... Water supply device, 15 ... Transmission line, 16 ... System power supply, 21 ... Load Apparatus, 26a ... Hot water use device, 26b ... Heat use device, 30 ... Hot water storage tank, 34 ... Temperature sensor group, 36 ... Flow rate sensor, 40 ... Operation control device.

Claims (2)

A power generator for supplying power to the load device;
A hot water storage tank for storing hot water recovered from the waste heat of the power generator and supplying the hot water to the hot water use device;
Based on the operation stop time specified in advance, the consumption pattern of the amount of hot water consumed by the hot water use device, the predicted value of the remaining hot water amount in the hot water storage tank, and the consumption data of the amount of hot water consumed by the hot water use device on the day And an operation control device that performs power generation control or power generation stop control of the power generation device ,
The operation control device sets the consumption pattern of the amount of hot water consumed by the hot water usage device to the first data of the amount of hot water consumed during the operation stop time specified by the input and the operation time other than the operation stop time. Divide it into second data on the amount of hot water consumed, and subtract the data on the amount of hot water consumed in the hot water usage device from the start of the day to the present from the second data on the amount of hot water consumed during the operation time. Then, the first data of the amount of hot water consumed during the operation stop time is added to the subtraction value as a threshold value, and the threshold value becomes larger than the predicted value of the remaining hot water amount in the hot water storage tank during the operation time. When the power generation control of the power generation device is continued and the power generation device becomes smaller, the power generation device is controlled to stop power generation.   In Claim 1, the said operation control apparatus memorize | stores the amount of hot water consumed with the said hot water use apparatus until a fixed period for every time slot | zone, creates the said consumption pattern, and the hot water consumed with the said hot water use apparatus A cogeneration system that is controlled based on the data of the day when the amount of water is the maximum.

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