JP4544591B2 - Cogeneration power interchange system - Google Patents

Description

  The present invention relates to a cogeneration power interchange system capable of accommodating power among a plurality of users in consideration of the amount of heat stored in each user's hot water storage tank.

Conventionally, a cogeneration power interchange system described in Patent Documents 1 and 2 is known. These cogeneration power interchange systems include a power generation device that supplies power to a load device, a plurality of cogeneration devices that have hot water storage tanks that store hot water that has recovered exhaust heat from the power generation device, and a control that controls each cogeneration device. And a power transmission line connected between the power generators and capable of transferring power between the power generators. And in these cogeneration power interchange systems, by predicting the power consumption pattern of a plurality of users and predicting the total power consumption, it is possible to generate electric power as a whole system without excess or deficiency.
Japanese Patent Laid-Open No. 2003-134673 Japanese Patent Laid-Open No. 2003-153440

  However, in the conventional cogeneration power interchange system, since the amount of hot water in each hot water tank is not taken into account when determining the amount of power generated by each power generation device, it is not possible to efficiently recover exhaust heat.

  The present invention has been made in view of the related problems, and provides a cogeneration power interchange system capable of efficiently recovering exhaust heat.

In order to solve the above problems, a feature of the cogeneration power interchange system according to claim 1 is that a power generation device that supplies power to the load device and a hot water storage tank that stores hot water from which the exhaust heat of the power generation device is recovered are provided. And a plurality of cogeneration devices that supply the power and the hot water to a plurality of users, a control device that controls each of the cogeneration devices, and the power generation devices. A transmission line capable of receiving and receiving, a maximum heat amount calculating means for obtaining a maximum heat amount stored in each hot water tank, a current heat amount calculating means for obtaining a current heat quantity currently stored in each hot water tank, and each of the hot water tanks A power generation amount indication value for determining a remaining heat amount stored in each hot water storage tank from the maximum heat amount and the current heat amount, and determining an instruction value of the power generation amount generated by each power generator according to the remaining heat amount Comprising a constant section, wherein the power generation amount instruction value determining means, the power generation amount instruction value generated by the at a plurality of said user each power generation device _{(1,2 ··· N) Eg 1,} Eg 2 ··· Eg _N , the remaining heat stored in each hot water storage tank as Q ₁ , Q ₂ ... Q _N , the total power consumption E0 consumed by all the users, and the supply water temperature of the i-th power generator and TW _i, the outside air temperature around the i-th power generator and Ta _i, a heat recovery calculation of the i-th power generator _{f i (Eg i, TW i} , Ta i) When the power generation amount the indicated value _{Eg 1, Eg 2 ··· Eg N} ,
Eg ₁ + Eg ₂ +... + Eg _N = E0
f ₁ (Eg ₁ , TW ₁ , Ta ₁ ) / f ₂ (Eg ₂ , TW ₂ , Ta ₂ ) = Q ₁ / Q ₂
f ₂ (Eg ₂ , TW ₂ , Ta ₂ ) / f ₃ (Eg ₃ , TW ₃ , Ta ₃ ) = Q ₂ / Q ₃
・
・
・
_{f N-1 (Eg N-} 1, TW N-1, Ta N-1) / f N (Eg N, TW N, Ta N) = Q N-1 / Q N
It is determined by solving the simultaneous equations.

The cogeneration power interchange system according to claim 2 is characterized in that, in claim 1, the maximum heat amount calculation means is configured such that the temperature of the hot water from which the exhaust heat of the power generator is recovered and the temperature of the water supplied to the hot water storage tank. The maximum amount of heat stored in each hot water storage tank is obtained from the capacity of the hot water storage tank.
The cogeneration power interchange system according to claim 3 is characterized in that a filter is provided so that the power generation apparatus can follow the power generation amount instruction value determined by the power generation amount instruction value determination means according to claim 1 or 2 . It is to have a vibration removing means for performing processing.

In the cogeneration power interchange system according to claim 1 , the total power consumption and the total power generation amount are equal, and the power generation amount of each power generation device, the supply water temperature of each power generation device, the outside air temperature near each power generation device, and each hot water storage Taking into account the amount of remaining heat stored in the tank, it is possible to obtain a power generation amount instruction value generated by each power generation device, and it is possible to efficiently recover exhaust heat.

In the cogeneration power interchange system according to the second aspect, the maximum heat amount stored in each hot water tank used for calculation of the remaining heat amount stored in each hot water tank can be obtained.
In the cogeneration power interchange system according to the third aspect , since the power generation amount instruction value for each power generator is subjected to the filter process, good control performance can be obtained.

  An embodiment embodying a cogeneration power interchange system according to the present invention will be described below with reference to the drawings. As this power interchange system, an example applied to two homes 5 as shown in FIG. 1 will be described.

  In this power interchange system, electric power can be exchanged between the home cogeneration apparatus 1 installed in each home 5, the control apparatus 2 that controls these home cogeneration apparatuses 1, and the home cogeneration apparatus 1. A power transmission line 3 and a hot water supply pipe 4 for supplying hot water are provided. Hot water and electric power are supplied from the home cogeneration apparatus 1 to the home 5. However, since hot water increases heat dissipation, hot water is not interchanged between the homes 5, and only electric power is interchanged between the homes 5. Moreover, the control apparatus 2 inputs a sensor signal from the home cogeneration apparatus 1, and outputs a power generation amount instruction value.

  Next, with reference to FIG. 2, the home cogeneration apparatus 1 and the control apparatus 2 installed in one home 5 will be described in detail. FIG. 2 is a schematic diagram of a domestic cogeneration power interchange system according to the embodiment. The home cogeneration apparatus 1 includes a power generation apparatus 10 that supplies electric power to a load apparatus 21 and a hot water storage tank 30 that stores hot water that has recovered exhaust heat from the power generation apparatus 10.

  The power generation device 10 is a fuel cell power generation device, and includes a generator 11 that generates DC power, and a converter (for example, an inverter) 12 that converts DC power supplied from the 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. The reforming device steam-reforms the fuel supplied from the fuel supply device 13 with the 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 the reformed gas 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 oxidant electrode.

  The converter 12 is connected to a plurality of load devices 21 installed in the power usage place 20 via the power transmission line 3, and the AC power output from the converter 12 is supplied to each load device 21 as necessary. Has been supplied to. 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. The power transmission line 3 connecting the converter 12 and the power usage place 20 is also connected to the grid power supply 16 of the power company (system interconnection), and the total power consumption of the load device 21 is determined by the power generation amount of the power generation device 10. Is exceeded, the insufficient power is received from the system power supply 16 and compensated. The wattmeter 22 detects the total power consumption Et of all the load devices 21 used in the power usage place 20 and transmits it to the control device 2.

  The generator 11 is connected to a cooling circuit 31 in which a heat medium for recovering the exhaust heat of the generator 11 and cooling the generator 11 circulates. A heat exchanger 32 is disposed on the cooling circuit 31. On the other hand, a hot water circulation circuit 33 for heating 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 generator 11 so that 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. Further, a temperature sensor 35 is provided in the vicinity of the hot water tank 30 inlet of the hot water circulation circuit 33, and this temperature sensor 35 detects the exhaust heat recovery temperature Tin and transmits it to the control device 2. The exhaust heat of the generator 11 refers to, for example, the exhaust heat of the fuel cell stack and the exhaust heat of the reformer in the case of a fuel cell power generator, and the exhaust heat of the engine in the case of an engine power generator. It is done. However, the present invention is not limited to this, and any recoverable exhaust 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 hot water stored in the hot water tank 30 is led out from the upper part of the columnar container of the hot water tank 30, and tap water from the water supply device 14 is supplied to the columnar container of the hot water tank 30 so as to replenish the derived amount. It is introduced from the bottom. Such a hot water tank 30 is installed near the power generation apparatus 10. Further, a temperature sensor 36 is provided near the inlet of the hot water tank 30 to which tap water is supplied from the water supply device 14, and this temperature sensor 36 detects the tap water temperature Tw and transmits it to the control device 2. It has become.

  A temperature sensor group 34 is provided inside the hot water tank 30. 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 the vertical direction (vertical direction). Are arranged at equal intervals along the line. 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 temperature sensor group 34 detects the hot water temperature Th at each position and transmits it to the control device 2.

  A hot water supply pipe 4 is connected to the hot water tank 30. The hot water supply pipe 4 is provided with a gas water heater (not shown) and a temperature sensor (not shown) which are auxiliary heating devices in order from the upstream. The gas water heater heats hot water from the hot water storage tank 30 passing through the hot water supply pipe 4 to supply hot water. The temperature sensor detects the temperature of the hot water after passing through the gas water heater, and the detection signal is transmitted to the control device 2. That is, the hot water is heated by the gas water heater so that the temperature of the hot water detected by the temperature sensor becomes the set hot water temperature. Although not shown, tap water from the water supply device 14 joins the hot water supply pipe 4 between the outlet port of the hot water tank 30 and the temperature sensor. Thereby, the temperature of the hot water from the hot water tank 30 is lowered.

  Connected to the hot water supply pipe 4 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 4 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 bathing 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 control device 2 includes a total electric energy Et input from the wattmeter 22, a hot water temperature Th input from the temperature sensor group 34, an exhaust heat recovery temperature Tin input from the temperature sensor 35, a tap water temperature Tw input from the temperature sensor 36, and the like. The power generation amount of the power generation device 10 is determined based on the above, and the power generation amount instruction value Eg is output to the power generation device 10. The control device 2 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 flowcharts of FIGS. 3 to 7 to control the power generation amount (output power) of the power generation device. The RAM temporarily stores variables necessary for executing the program, and the ROM stores the program.

  Next, the operation of the above-described home cogeneration power interchange system will be described with reference to FIGS. Hereinafter, one home 5 is referred to as A home and the other home 5 is referred to as B home.

  The control device 2 executes the main program shown in FIG. 3 every predetermined time (for example, 60 seconds) when the generator 11 is in a state capable of generating power. When this main program is executed, the maximum heat quantity calculation subroutine as the maximum heat quantity calculation means is called in step S1, and the current heat quantity calculation subroutine as the current heat quantity calculation means is called in step S2. In step S3, a power generation amount instruction value determination subroutine as a power generation amount instruction value determination unit is called, and in step S4, a vibration removal subroutine as a vibration removal unit is called.

  Next, each subroutine will be described. In the maximum heat amount calculation subroutine, as shown in FIG. 4, the maximum heat amount Qall that can be stored in each hot water tank 30 is calculated. First, in step S11, the exhaust heat recovery temperature Tin is input from the temperature sensor 35. In step S12, the tap water temperature Tw is input from the temperature sensor 36. In step S13, the maximum amount of heat Qall of each hot water tank 30 is calculated by the following equation (2).

(Equation 2)
Qall = Cp × V × (Tin−Tw)

Cp is specific heat and is 4.189 J / cm ³ · K. V is the capacity (m ³ ) of the hot water tank 30 and is 0.15 m ³ in this embodiment. Tin and Tw are the exhaust heat recovery temperature and the tap water temperature (° C.), respectively. A graph of the exhaust heat recovery temperature Tin and the tap water temperature Tw at the house A is shown in FIG. 5 (A), and a graph of the maximum heat quantity Qall at the house A is shown in FIG. 5 (B). Further, a graph of the exhaust heat recovery temperature Tin and the tap water temperature Tw at the house B is shown in FIG. 6A, and a graph of the maximum heat quantity Qall at the house B is shown in FIG.

In the current heat quantity calculation subroutine, as shown in FIG. 7, the current heat quantity Qcu currently stored in each hot water tank is calculated. First, in step S21, the hot water temperature Th is input from the temperature sensor group 34. In step S22, the current heat quantity Qcu is calculated from the hot water temperature Th and the tap water temperature Tw. At this time, for each layer divided by the positions of the temperature sensors 34-1, 34-2, 34-3,. Are calculated and the total heat quantity Qcu is calculated. In this case, the capacity (m ³ ) of each layer corresponds to V in Equation 2, and the average temperature (° C.) of each layer corresponds to Tin.

In the power generation amount instruction value determination subroutine, as shown in FIG. 8, the power generation amount instruction values Eg ₁ and Eg ₂ for each power generation device 10 are determined. First, in step S31, the exhaust heat recovery characteristic with respect to the power generation amount is set. Specifically, in actual operation of the power generation apparatus 10, the exhaust heat recovery amount (W) with respect to the power generation amount (W) is measured and stored every week, and the power generation amount is plotted on the horizontal axis (x), the exhaust amount. By plotting the heat recovery amount as the vertical axis (y), a virtual approximate straight line equation shown in the following equation 3 can be obtained. However, data older than one month is deleted so that the characteristics of the power generation apparatus 10 can always be learned.

(Equation 3)
y = ax + b

  In step S <b> 32, the total power consumption Et is input from each wattmeter 22. A graph of the total power consumption Et at the A house is shown in FIG. 9A, and a graph of the total power consumption Et at the B house is shown in FIG. 9B. In step S33 of FIG. 8, the total power consumption E0 is calculated by adding the total power consumption Et of the two houses. A graph of this total power consumption E0 is shown in FIG. In step S34 of FIG. 8, the remaining heat quantity that can be stored in each hot water tank 30 by subtracting the current heat quantity Qcu (calculated in step S22) from the maximum heat quantity Qall (calculated in step S13) of each hot water tank 30. Q is calculated. FIG. 11A shows a graph of the remaining heat quantity Q at the A house, and FIG. 11B shows a graph of the remaining heat quantity Q at the B house.

In step S35 of FIG. 8, the power generation amount instruction values Eg ₁ and Eg ₂ for the respective power generation devices 10 are calculated by the equations shown in the following equations 4 and 5. However, the power generation amount instruction value Eg ₁ is a power generation amount instruction value for the power generation apparatus 10 in the A house, and the power generation amount instruction value Eg ₂ is a power generation amount instruction value for the power generation apparatus 10 in the B house. Also, Q ₁ is a remaining amount of heat that can be stored in the hot water storage tank 30 of the A's home, Q ₂ is the remaining amount of heat that can be stored in the hot water storage tank 30 of the B house (computed in step S34). Further, E0 is the total power consumption (calculated in step S33), and a and b are coefficients of the approximate straight line equation expressed by equation 3 in step S31.

Here, it is proved that the power generation amount instruction values Eg ₁ and Eg ₂ for the respective power generation devices 10 are expressed by the above formulas 4 and 5. In general, Eg ₁ , Eg ₂ ... Eg _N are the power generation amount instruction values generated by each of the power generation devices (1, 2,... N) in a plurality of users, and the remaining heat amount stored in each hot water storage tank is Q _1. , and Q ₂ ··· Q _N, the total power consumption E0 consumed by all users, the supply water temperature of the i-th power generator and TW _i, the i-th ambient temperature in the vicinity of the power generation apparatus and Ta _i, the i-th heat recovery calculation of the power generator _{f i (Eg i, TW i} , Ta i) When the power generation amount instruction value _{Eg 1, Eg} 2 ··· _{Eg N} is shown in equation 6 It is obtained by solving simultaneous equations.

(Equation 6)
Eg ₁ + Eg ₂ +... + Eg _N = E0
f ₁ (Eg ₁ , TW ₁ , Ta ₁ ) / f ₂ (Eg ₂ , TW ₂ , Ta ₂ ) = Q ₁ / Q ₂
f ₂ (Eg ₂ , TW ₂ , Ta ₂ ) / f ₃ (Eg ₃ , TW ₃ , Ta ₃ ) = Q ₂ / Q ₃
・
・
・
_{f N-1 (Eg N-} 1, TW N-1, Ta N-1) / f N (Eg N, TW N, Ta N) = Q N-1 / Q N

In this embodiment, assuming that the two power generation devices 10 are the same, the supply water temperatures TW ₁ and TW ₂ and the outside air temperatures Ta ₁ and Ta ₂ near the power generation device 10 are the power generation amount instruction value Eg ₁ , since the correlation of the equation f _1, f ₂ of the heat recovery amount in comparison with Eg ₂ is small, equation f ₁ of the exhaust heat recovery of the two power generating device 10 _of, f ₂ is shown in equation 7 equation It is represented by Note that the coefficients a and b in Expression 7 are the same as the coefficients a and b in Expression 3.

(Equation 7)
f ₁ (Eg ₁ , TW ₁ , Ta ₁ ) = a · Eg ₁ + b
f ₂ (Eg ₂ , TW ₂ , Ta ₂ ) = a · Eg ₂ + b

  By substituting these into the general formula represented by Equation 6 above, the equation shown in Equation 8 is obtained.

(Equation 8)
Eg ₁ + Eg ₂ = E0
(A · Eg ₁ + b) / (a · Eg ₂ + b) = Q ₁ / Q ₂

When Expression 8 is solved for the power generation amount instruction values Eg ₁ and Eg ₂ , Expressions 4 and 5 are obtained.

FIG. 12 shows the power generation amount instruction values Eg ₁ and Eg ₂ obtained by the equations (4) and (5). FIG. 12A is a graph of the power generation amount instruction value Eg ₁ of the A house, and FIG. 12B is a graph of the power generation amount instruction value Eg ₂ of the B house.

As shown in the equation 3 or 7, the exhaust heat recovery amount (W) is a linear function of the power generation amount (W), and the second term of the numerator of the equations 4 and 5 is a term to which the coefficient b contributes. . Therefore, if the coefficient b = 0, that is, if the exhaust heat recovery amount (W) and the power generation amount (W) are in a proportional relationship, the power generation amount instruction values Eg ₁ and Eg ₂ are expressed by the following equations 9 and 10. Desired.

(Equation 9)
Eg ₁ = Q ₁ · E0 / (Q ₁ + Q ₂ )

(Equation 10)
Eg ₂ = Q ₂ · E0 / (Q ₁ + Q ₂ )

According to Equations 9 and 10, the ratio of the remaining heat amounts Q ₁ and Q ₂ that can be stored in each hot water storage tank 30 is equal to the ratio of the power generation amount instruction values Eg ₁ and Eg ₂ for each power generation device 10. For example, if the ratio of the remaining amount of heat Q ₁ that can be stored in the hot water storage tank 30 at A and the remaining amount of heat Q ₂ that can be stored in the hot water storage tank 30 at B is 1: 2, The ratio between the power generation amount instruction value Eg ₁ for the power generation apparatus 10 and the power generation amount instruction value Eg ₂ for the power generation apparatus 10 at the B home is also 1: 2.

In the vibration removal subroutine, as shown in FIG. 13, after the power generation amount instruction values Eg ₁ and Eg ₂ for each power generation apparatus 10 are filtered, the power generation amount instruction values Efg ₁ and Efg ₂ after the filter processing are generated for each power generation. Output to the device 10. First, in step S41, the power generation amount instruction values Eg ₁ and Eg ₂ are filtered by the equations shown in the following equations 11 and 12, and the power generation amount instruction values Efg ₁ and Efg ₂ after the filter processing are obtained. However, Eg ₁ and Eg ₂ are the power generation amount instruction values obtained by the above formulas 4 and 5. Further, a1, a2, b1, and b2 are filter constants, and z is a delay operator.

FIG. 14 shows the power generation amount instruction values Efg ₁ and Efg ₂ after the filter processing obtained by the equations 11 and 12. FIG. 14A is a graph of the power generation amount instruction value Efg ₁ of A house, and FIG. 14B is a graph of the power generation amount instruction value Efg ₂ of B house.

In step S <b> 42 of FIG. 13, the power generation amount instruction values Efg ₁ and Efg ₂ after filtering are output to each power generation device 10. Thereby, each power generator 10 can generate electric power without excess or deficiency with respect to the total power consumption consumed by each home 5 and can efficiently recover exhaust heat.

  In this embodiment, two homes 5 are provided, but the same applies to three or more homes 5. In addition, the cogeneration power interchange system of the present invention can be used not only at home but also at users such as offices.

  In addition, although the cogeneration power interchange system of this invention was demonstrated according to embodiment, this invention is not restrict | limited to these, As long as it is not contrary to the technical idea of this invention, it can change and apply suitably. Needless to say.

The schematic diagram of the home cogeneration electric power interchange system of embodiment. Schematic of the home cogeneration power interchange system of the embodiment. The flowchart of the main program according to the embodiment. The flowchart of the maximum heat amount calculation subroutine according to the embodiment. The graph of the waste heat recovery temperature of the A house, the tap water temperature, and the maximum heat quantity according to the embodiment. The graph of the waste heat recovery temperature of B house, tap water temperature, and the maximum heat amount according to the embodiment. The flowchart of the present heat quantity calculation subroutine according to the embodiment. The flowchart of a power generation amount instruction value determination subroutine according to the embodiment. The graph of total power consumption according to the embodiment. The graph of the total power consumption according to the embodiment. The graph of the remaining calorie | heat amount according to embodiment. The graph of the electric power generation instruction value calculated by the electric power generation instruction value determination subroutine according to the embodiment. The flowchart of a vibration removal subroutine according to the embodiment. The graph of the electric power generation amount instruction value after execution of a vibration removal subroutine according to the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cogeneration apparatus (household cogeneration apparatus), 2 ... Control apparatus, 3 ... Power transmission line, 10 ... Power generation apparatus, 30 ... Hot water storage tank, S1 ... Maximum heat amount calculation means (maximum heat amount calculation subroutine), S2 ... Current heat amount Calculation means (current heat quantity calculation subroutine), S3 ... Power generation amount instruction value determination means (power generation amount instruction value determination subroutine), S4 ... Vibration removal means (vibration removal subroutine).

Claims (3)

A power generation device that supplies power to the load device, and a hot water storage tank that stores hot water from which the exhaust heat of the power generation device is collected, and a plurality of cogeneration devices that supply the power and the hot water to a plurality of users;
A control device for controlling each of the cogeneration devices;
A power transmission line connected between the power generators, and capable of transmitting and receiving power between the power generators;
Maximum heat quantity calculating means for obtaining the maximum heat quantity stored in each hot water storage tank;
A present heat quantity calculating means for obtaining a present heat quantity currently stored in each hot water storage tank;
A power generation amount instruction for obtaining a remaining heat amount stored in each hot water storage tank from the maximum heat amount and the current heat amount of each hot water storage tank, and determining an instruction value of the power generation amount generated by each power generator according to the remaining heat amount A value determining means,
The power generation amount instruction value determination means sets Eg ₁ , Eg ₂ ... Eg _{N as} power generation amount instruction values generated by the power generation devices (1, 2,... N) of the plurality of users , and stores each hot water storage. The remaining heat amount stored in the tank is defined as Q ₁ , Q ₂ ... Q _N , the total power consumption E0 consumed by all the users, the supply water temperature of the i-th power generation device as TW _i , and the i-th the outside air temperature around the power generation apparatus and Ta _i, a heat recovery calculation of the i-th power generator _{f i (Eg i, TW i} , Ta i) When the power generation amount instruction value _Eg 1, Eg ₂ ... Eg _N is determined by solving the following simultaneous equations of Equation 1 below.
(Equation 1)
Eg ₁ + Eg ₂ +... + Eg _N = E0
f ₁ (Eg ₁ , TW ₁ , Ta ₁ ) / f ₂ (Eg ₂ , TW ₂ , Ta ₂ ) = Q ₁ / Q ₂
f ₂ (Eg ₂ , TW ₂ , Ta ₂ ) / f ₃ (Eg ₃ , TW ₃ , Ta ₃ ) = Q ₂ / Q ₃
・
・
・
_{f N-1 (Eg N-} 1, TW N-1, Ta N-1) / f N (Eg N, TW N, Ta N) = Q N-1 / Q N 2. The hot water storage unit according to claim 1, wherein the maximum heat amount calculation means calculates the temperature of the hot water from which the exhaust heat of the power generator is recovered, the temperature of the water supplied to the hot water storage tank, and the capacity of the hot water storage tank. Cogeneration power interchange system characterized by finding the maximum amount of heat stored in 3. The code according to claim 1, further comprising vibration removing means for performing a filtering process so that the power generation apparatus can follow the power generation amount instruction value determined by the power generation amount instruction value determination means. Generation power interchange system.

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