JP4229865B2 - Energy supply system - Google Patents

Description

  The present invention relates to an electric power load that receives supply of power from at least one of a combined heat and power device that generates heat and electricity, a solar power generation device, a combined heat and power generation device, a solar power generation device, and a commercial power system. The present invention relates to an energy supply system provided with a device, a heat load device that receives supply of heat from the cogeneration device, and a control unit that controls the operation of the cogeneration device.

  Such an energy supply system is configured such that the power load device receives power supply from the solar power generation device and the combined heat and power supply device, and the heat load device receives heat supply from the combined heat and power supply device. In such an energy supply system, it is desirable to operate so as to save costs. As such an energy supply system, a solar power with a higher power selling price than the generated power of a combined heat and power unit with a lower power selling price is used. For the purpose of selling the power generated by the photovoltaic power generation system to the commercial power grid, when the amount of power generated by the combined heat and power system is greater than or equal to the power load of the power load device, all of the power load of the power load device is Covering with the power generation amount of the cogeneration device, selling the power generation amount of the solar power generation device to the commercial power system, and when the power generation amount of the cogeneration device is less than the power load amount of the power load device, There is one that does not operate the combined heat and power supply, and covers all of the power load amount of the power load device by the power generation amount of the photovoltaic power generation device and the power purchase from the commercial power system (for example, patent documents) Reference 1).

JP-A-8-186937 (FIG. 4)

  In the energy supply system described above, it is determined whether or not to operate the cogeneration device based only on the comparison between the power load amount of the power load device and the power generation amount of the cogeneration device. Then, it is desired to perform operation control of the combined heat and power supply device in order to achieve the cost saving of the energy supply system while covering the heat load amount of the heat load device. In other words, as an operation mode of the energy supply system, if a mode that achieves cost saving under the condition that the heat load of the heat load device is covered by the amount of heat generated by the cogeneration device, a large amount of Although it is possible to achieve cost saving while avoiding falling into heat surplus and heat shortage, the conventional energy supply system cannot satisfy such a demand.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an energy supply system capable of operating a combined heat and power supply device so as to save costs while providing the heat load amount of the heat load device. The point is to provide.

In order to achieve the above object, a first characteristic configuration of an energy supply system according to the present invention includes a combined heat and power device that generates heat and electricity, a photovoltaic power generation device, the combined heat and power device, and the photovoltaic power generation. A power load device that receives power supply from at least one of the device and the commercial power system, a heat load device that receives heat supply from the heat and power supply device, and a control means for controlling the operation of the heat and power supply device. In the energy supply system provided, the control means predicts a time-series predicted heat load amount in the determination target period for the heat load device, and generates a heat amount that can cover the predicted heat load amount. A time-series predicted power generation amount in the determination target period of the combined heat and power generation apparatus generated when the operation is performed, and a time series in the determination target period of the photovoltaic power generation apparatus A predicted power generation amount, a time-series predicted power load amount in the determination target period of the power load device, a time-series power selling fee in the determination target period to the commercial power system, and the commercial power Cost for supplying power and heat to the power load device and the heat load device derived by cost calculation based on time-series power purchase charges in the discrimination target period from the grid is at least the photovoltaic power generation The operating time zone of the combined heat and power unit for performing the main heat operation is determined within the determination target period so as to save costs under the condition that the power generated by the device can be sold. is configured to operate the cogeneration device to the time zone, the operating time period of the cogeneration device is that a the Ru defined at the beginning of the determination period.

According to the first characteristic configuration described above, when the control unit predicts a time-series predicted thermal load amount in the determination target period for the thermal load device and performs a heat main operation that generates a heat amount that can cover the predicted thermal load amount. The time-series predicted power generation amount in the determination target period of the combined heat and power generation device generated in conjunction with the above, the time-series predicted power generation amount in the determination target period of the solar power generation device, and the power load device Time-series predicted power load amount in the discrimination target period, time-series power selling fee in the discrimination target period to the commercial power system, and time-series power purchase fee in the discrimination target period from the commercial power system The conditions for making it possible to sell at least the power generated by the photovoltaic power generation device, when the power and heat are supplied to the power load device and the heat load device derived by the cost calculation based on As a cost saving under the operating hours of the cogeneration apparatus for performing thermal main driving defined in the determination period, it is configured to operate the cogeneration device to the operating time period, the thermoelectric the operation time period of the co-generation devices, Ru defined at the beginning of the determination period. That is, under the condition that the amount of heat generated by the combined heat and power supply device covers the heat load of the heat load device, the power sales fee of the amount of power generated by the solar power generation device to the power system increases, and By performing cost-saving calculation to derive the operation time zone of the combined heat and power unit that reduces the electricity purchase price from the power system, and actively shifting the operation of the combined heat and power unit to the operation time zone, the power load It is possible to carry out power supply to the apparatus and heat supply to the heat load apparatus at a low cost.
Therefore, an energy supply system capable of operating the combined heat and power supply apparatus so as to save costs while providing the heat load amount of the heat load apparatus is provided.

  In addition to the first characteristic configuration, the second characteristic configuration of the energy supply system according to the present invention is configured such that the power generated by both the solar power generation device and the combined heat and power supply device can be sold. There is in point.

  According to the second feature configuration, since the power generated by both the solar power generation device and the combined heat and power supply device can be sold, the amount of generated power of the solar power generation device and the sales of the combined heat and power supply device to the power system are sold. The operation time zone of the combined heat and power supply device that can further increase the electricity bill is derived, and as a result, the power supply to the power load device and the heat supply to the heat load device can be implemented at a low cost. Become.

  The third characteristic configuration of the energy supply system according to the present invention is the heat dissipation loss that occurs in the storage device in which the control means stores the amount of heat generated in the cogeneration device in addition to the first or second characteristic configuration. The heat source device that derives the amount and directly generates heat using the fuel is configured to include the estimated fuel fee required for generating the heat amount corresponding to the heat dissipation loss amount in the cost calculation. .

  According to the third feature configuration, the control means derives the amount of heat radiation loss generated in the storage device that stores the amount of heat generated by the combined heat and power supply device, and the heat source device that directly generates heat using the fuel Since the estimated fuel charge required to generate the amount of heat corresponding to the amount of loss is included in the above cost calculation, the loss caused by actively changing the operating time zone of the combined heat and power unit is treated as a cost. Thus, it is possible to perform an operation that saves costs while including an energy-saving viewpoint.

  According to a fourth characteristic configuration of the energy supply system of the present invention, in addition to the first or second characteristic configuration, the control means causes a heat dissipation loss that occurs in a storage device that stores the amount of heat generated in the combined heat and power supply device. Deriving the amount of heat, deriving the loss compensation operating time of the combined heat and power device required for generating the amount of heat corresponding to the heat dissipation loss amount in the combined heat and power device, and performing the operation of the combined heat and power device for the loss compensating operation time The operation cost of the cogeneration device that is sometimes required is included in the cost calculation.

  According to the fourth characteristic configuration, the control means derives the amount of heat dissipation loss generated in the storage device that stores the amount of heat generated in the combined heat and power device, and corresponds to the amount of heat dissipation loss by the energy efficient combined heat and power supply device. By being configured to generate the amount of heat to be generated, an energy supply system with high energy saving can be provided. In addition, it derives the loss compensation operation time of the combined heat and power device required for generating the heat amount corresponding to the heat dissipation loss in the combined heat and power device, and the combined heat and power device required when performing the loss and compensation operation time of the combined heat and power device. By being configured to include the operation cost in the cost calculation, it is possible to provide an energy supply system capable of operating the combined heat and power supply apparatus so as to save costs.

  According to a fifth characteristic configuration of the energy supply system according to the present invention, in addition to any one of the first to fourth characteristic configurations, the control means performs an operation that gives priority to energy saving to the combined heat and power supply device. When receiving a command to perform the operation of the cogeneration device for performing the heat main operation so that energy efficiency when supplying power and heat to the power load device and the heat load device is energy saving. The operation time zone is determined, and the combined heat and power supply device is operated during the operation time zone.

  According to the fifth characteristic configuration, when the control unit receives a command for performing an operation with priority on energy saving to the combined heat and power supply device, it supplies power and heat to the power load device and the heat load device. The operation time zone of the combined heat and power unit for performing the main heat operation is determined so that the energy efficiency is reduced, and the combined heat and power unit is operated during the operation time zone. It is possible to perform power supply to the power load device and heat supply to the heat load device while freely switching between operation and energy saving operation.

  A sixth characteristic configuration of the energy supply system according to the present invention is based on weather prediction information provided by the control means via an information communication line in addition to any of the first to fifth characteristic configurations. In the point which is comprised so that the prediction electric power generation amount of the said solar power generation device may be estimated.

  According to the sixth characteristic configuration, the control means is configured to predict the predicted power generation amount of the photovoltaic power generation apparatus based on weather prediction information such as the sunshine amount forecast provided via the information communication line. As a result, the amount of power generated by the solar power generation apparatus can be accurately predicted. As a result, the accuracy of the cost calculation is increased, and the probability that the operation of the combined heat and power supply apparatus is saved is increased.

<First Embodiment>
An energy supply system according to a first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, this energy supply system uses a combined heat and power supply device 3 configured to drive a power generation device 2 by a gas engine 1 and heat generated in the combined heat and power supply device 3. However, a hot water storage unit 6 that stores hot water in the hot water storage tank 4 as a storage device that stores the recovered heat and supplies a heat medium to the heat load device 5, and a solar power generation device PV that generates power by photoelectric conversion of sunlight. The operation control unit 7 as operation control means for controlling the operation of the combined heat and power supply device 3 and the hot water storage unit 6, the remote controller R and the like. The said heat load apparatus 5 is comprised by heating terminals, such as a floor heating apparatus and a bathroom heating apparatus.

On the output side of the power generation device 2, an inverter 8 for linking a power system provided with the combined heat and power supply device 3 to a commercial power system (hereinafter sometimes simply referred to as “commercial system”) 9 as an external power system. The inverter 8 is configured so that the output power of the power generation device 2 has the same voltage and the same frequency as the power supplied from the commercial system 9.
The commercial system 9 is, for example, a single-phase three-wire system 100/200 V, and is electrically connected to a power load device 11 such as a television, a refrigerator, or a washing machine via a commercial power supply line 10.
The inverter 8 is electrically connected to the commercial power supply line 10 via the cogeneration supply line 12, and the output power from the power generator 2 is supplied to the power load device 11 via the inverter 8 and the cogeneration supply line 12. It is comprised so that it may be supplied to. Then, the electric heater 14 as a heat source for surplus power recovery that recovers energy by consuming surplus power of the combined heat and power supply device 3 to generate heat and storing hot water in the hot water storage tank 4 by the heat is used for cogeneration. It is connected in the middle of the supply line 12.

  The solar power generation device PV is electrically connected to the commercial power supply line 10 via the inverter 60 and the solar power generation power supply line 61, and the output power from the power generation device 2 and the power from the commercial system 9 are It is comprised so that electric power can be supplied with respect to the electric power load apparatus 11 collectively. Furthermore, the electric power generated by the solar power generation device PV can be sold to the commercial system 9, and the power load amount at the power load device 11 is the power generation amount of the solar power generation device PV and the power generation of the combined heat and power supply device 3. When surplus power is generated below the amount of power, the power generated by the photovoltaic power generator PV in the surplus power can be reversely flowed to the commercial system 9 side in order to sell it to an electric power company or the like. It is configured as follows.

  The commercial power supply line 10 is provided with a commercial power measuring unit P1 that measures the commercial power supplied through the commercial power supply line 10, and the cogeneration supply line 12 includes the thermoelectric power supply device 3. A generated power measuring unit P2 for a combined heat and power device that measures the generated power is provided, and the generated power measuring unit P3 for the photovoltaic power generator that measures the generated power amount of the photovoltaic power generator PV is provided in the photovoltaic power supply line 61 Is provided. The commercial power measuring unit P1 is configured to detect whether or not a reverse power flow occurs in the current flowing through the commercial power supply line 10, that is, whether or not the above-described surplus power is generated. Further, the operation control unit 7 simultaneously monitors the commercial power measurement unit P1 and the generated power measurement unit P3 for the solar power generation device, and the reverse flow power amount based on the measurement result of the commercial power measurement unit P1 is the generated power for the solar power generation device. The power load amount of the electric heater 14 is adjusted so as not to exceed the amount of power generated by the solar power generation device PV based on the measurement result of the measurement unit P3. That is, only the electric power generated by the solar power generation device PV is configured to be able to reversely flow (sell power) to the commercial system 9.

The electric heater 14 is composed of a plurality of electric heaters, and is provided so as to heat the cooling water of the gas engine 1 flowing through the cooling water circulation path 15 by the operation of the cooling water circulation pump 17, and on the output side of the power generator 2. ON / OFF is switched by the connected operation switch 16.
Therefore, the power load amount of the electric heater 14 can be adjusted by switching ON / OFF of each operation switch 16. Incidentally, the electric load amount of the electric heater 14 is an electric amount obtained by multiplying the electric load amount (for example, 100 W) per electric heater by the number of the operation switches 16 that are turned on.
And an energy supply system changes ON / OFF of each operation switch 16, and the electric power load amount of the electric heater 14 becomes large, so that the magnitude | size for the generated electric power of the cogeneration apparatus 3 among surplus electric power becomes large. It will be.

Gas fuel is supplied to the gas engine 1 through the engine fuel passage 21 at a set flow rate (for example, 0.433 m ³ / h), and the combined heat and power supply device 3 is rated and operated. In operation, the generated power of the combined heat and power supply device 3 is substantially constant at the rated generated power (for example, 1 kW).

The hot water storage unit 6 circulates hot water in the hot water storage tank 4 through the hot water storage tank 4 and the hot water circulation path 18 for storing hot water in a state where temperature stratification is formed, and heats the heat medium supplied to the heat load device 5. Hot water circulation pump 19 that circulates hot water, heat medium circulation pump 23 that circulates and supplies the heat medium to the heat load device 5 through the heat medium circulation path 22, and hot water circulation path 18 that passes through the cooling water circulation path 15. Waste heat heat exchanger 24 that heats flowing hot water, heat medium heating heat exchanger 26 that heats the heat medium flowing through the heat medium circulation path 22 with hot water flowing through the hot water circulation path 18, and burner 27b And an auxiliary heater 27 as a heat source device for heating the hot water flowing through the hot water circulation path 18 by combustion. The auxiliary heater 27 is a device that directly generates heat using gas as a fuel, a heat exchanger 27a for flowing hot water to be heated, the burner 27b for heating the heat exchanger 27a, and the burner 27b. And a combustion fan 27c for supplying combustion air.
The auxiliary fuel passage 28 for supplying the gas fuel to the burner 27b has an auxiliary fuel solenoid valve 29 for intermittently supplying the gas fuel to the burner 27b, and an auxiliary fuel proportional ratio for adjusting the supply amount of the gas fuel to the burner 27b. A valve 30 is provided.

  The hot water storage tank 4 is provided with four tank thermistors Tt as hot water storage amount detecting means for detecting the hot water storage amount of the hot water storage tank 4 at intervals in the vertical direction. That is, when the tank thermistor Tt detects a temperature equal to or higher than the set temperature, it is assumed that hot water is stored at the installation position, and the tank thermistor Tt at the bottom of the tank thermistors Tt whose detected temperature is equal to or higher than the set temperature. Based on the position, the hot water storage amount is detected in four stages. When the detection temperatures of all four tank thermistors Tt are equal to or higher than the set temperature, it is detected that the hot water storage amount of the hot water storage tank 4 is full. It is comprised so that.

The hot water circulation path 18 is connected to a take-out path 35 communicating with the lower part of the hot water storage tank 4 and a hot water storage path 36 communicating with the upper part of the hot water storage tank 4. The hot water storage path 36 is constituted by an electromagnetic proportional valve. A hot water storage valve 37 that adjusts the flow rate of hot water and interrupts the flow is provided.
The hot water circulation path 18 includes the exhaust heat heat exchanger 24, the hot water circulation pump 19, the auxiliary heater 27, and an electromagnetic proportional valve in the order of circulation of the hot water from the connection point with the extraction path 35. The heating valve 39 configured to adjust the flow rate of hot water and to interrupt the flow, and the heat exchanger 26 for heat medium heating are provided.

  The auxiliary equipment provided in the energy supply system includes an auxiliary machine unique to the energy supply system and an auxiliary machine originally necessary for the energy supply system. The unique auxiliary machines include the cooling water circulation pump 17 and the hot water. The circulation pump 19 and the like are included, and the auxiliary machine that is originally necessary includes the heat medium circulation pump 23 and the like, and the power load amount of the auxiliary machine that is originally necessary is similar to that of the power load device 11 to the user. It is treated as power consumed.

  The hot water circulation path 18 is provided with an inlet thermistor Ti for detecting the temperature of hot water flowing into the auxiliary heater 27 and an outlet thermistor Te for detecting the temperature of hot water flowing out of the auxiliary heater 27. The hot water supply passage 20 for supplying hot water taken out from the upper part of the hot water storage tank 4 is provided with hot water supply thermal load measuring means 31 for measuring the hot water supply thermal load amount at the hot water supply terminal 5a, and the heating heat load amount at the heating terminal 5b. Heating heat load measuring means 32 for measuring the temperature is provided.

Based on FIG. 8, the remote control R of the energy supply system will be described.
The remote control R includes a display unit 42 that displays and outputs various types of information, a speaker 43 that outputs various types of information by voice, a navigation switch 44 that switches information output to the display unit 42 and the speaker 43, and an automatic operation of the combined heat and power supply device 3 A power generation changeover switch 45 for switching between operation and manual operation, a power generation switch 46 for commanding operation and stop of the cogeneration apparatus 3, a selection switch 47 for selecting the type of data to be input, and the type selected by the selection switch 47 There are provided a setting switch 48 for setting the data, a confirmation switch 49 for confirming the input data to the data set by the setting switch 48, and the like. In addition, an on-operation display mark 50 is displayed on the display unit 42 when the combined heat and power supply device 3 is in operation.

When the power generation changeover switch 45 is switched to automatic operation, the cogeneration apparatus 3 is learned and operated as described later. When the power generation changeover switch 45 is switched to manual operation and the operation time zone is set, the setting is made. The combined heat and power supply device 3 is operated in the operating time zone.
In addition, when the power generation switch 46 is turned on in the state where the power generation changeover switch 45 is switched to automatic operation, the cogeneration device 3 is operated immediately. When the power generation switch 46 is turned off, the cogeneration device 3 is stopped for about one hour and then automatically. Become driving.
When the power generation switch 46 is switched to manual operation, the cogeneration device 3 is operated as soon as the power generation switch 46 is turned on, and the cogeneration device 3 is operated as soon as the power generation switch 46 is turned off. The stop state is continued until the power generation changeover switch 45 or the power generation switch 46 is operated next.
While the power generation changeover switch 45 is switched to manual operation, the measurement data of the power load amount and the heat load amount is excluded from load data used in the learning operation described later. Yes.

When operating the combined heat and power supply device 3 in the above-described manual operation and automatic operation, the operation control unit 7 controls the operating state of the combined heat and power supply device 3 and the cooling water circulation pump 17, and the hot water circulation pump 19, the heat medium By controlling the operation state of the circulation pump 23, a hot water storage operation for storing hot water in the hot water storage tank 4, a heat medium supply operation for supplying a heat medium to the heat load device 5, and the like are performed. The surplus power generated by the combined heat and power supply device 3 is converted into heat by the electric heater 14, and the surplus power selling operation for selling the surplus power generated by the solar power generation device PV to the commercial system 9. Mode. Further, the operation control unit 7 is configured to execute a predicted load calculation process, a data update process, a driving availability determination process, and the like, as will be described later, in order to perform an automatic driving by the learning driving.
The operation control unit 7 is configured to perform output information switching control for switching information to be output to the display unit 42 and the speaker 43 of the remote controller R.

  By the way, when a hot water tap (not shown) is opened, hot water is taken out from the upper part of the hot water storage tank 4 and hot water is supplied through the hot water supply passage 20, and when the hot water tap is opened, the hot water storage tank 4 When hot water is not stored in the hot water, the hot water circulation pump 19 is operated, the hot water storage valve 37 is opened, the auxiliary heater 27 is heated, and heated by the auxiliary heater 27 to be stored. Hot water is supplied to the hot water supply passage 20 through the passage 36.

First, the learning operation of the cogeneration apparatus 3 by the operation control unit 7 will be described.
The operation control unit 7 performs a data update process in which past load data for one day is updated and stored in a state associated with the day of the week based on the actual usage situation, and whenever the date changes to midnight, From the stored past load data for one day, predicted load calculation processing for obtaining predicted load data for one day of the day is performed.
And the operation control part 7 calculates | requires the energy-saving reference value used as the reference | standard of whether to operate the cogeneration apparatus 3 from prediction load data in the state which calculated | required the prediction load data for the 1st of the day. The operation of the combined heat and power unit 3 depends on whether or not the actual energy saving level is higher than the energy saving level reference value obtained by the energy saving level reference value calculating process. It is comprised so that the driving | running | working propriety determination process which discriminate | determines the propriety of this may be performed.

  In this way, when it is determined that the operation of the combined heat and power supply device 3 is possible in the operation determination process, the operation control unit 7 operates the combined heat and power supply device 3 and determines that the combined operation of the combined heat and power supply device 3 is impossible. Then, the operation of the combined heat and power supply device 3 is stopped.

  Then, the operation control unit 7 is configured to stop the operation of the combined heat and power supply device 3 when the amount of hot water stored in the hot water storage tank 4 is full during the operation time period.

  When the description of the data update processing is added, past load data for one day indicating how much power load amount, hot water supply heat load amount and heating heat load amount as heat load in which time zone in one day is obtained. It is configured to be updated and stored in a state associated with the day of the week.

First, the past load data will be described. The past load data is composed of three types of load data, that is, power load amount data, hot water supply heat load amount data, and heating heat load amount data. As shown in FIG. The past load data is stored in a state of being divided for each day of the week from Sunday to Saturday.
The past load data for one day includes 24 pieces of power load amount data per unit time, 24 pieces of hot water supply heat load amount data per unit time, and one unit of 24 hours. It consists of 24 pieces of heating heat load data per hour.

When the configuration for updating the past load data as described above is added, the actual power usage amount, the hot water supply heat load amount, and the heating heat load amount per unit time are respectively calculated from the commercial power measurement unit. Measured by P1, generated power measurement unit P2 for combined heat and power generation device, generated power measurement unit P3 for photovoltaic power generation device, hot water supply heat load measurement means 31, and heating heat load measurement means 32, and stores the measured load data In this state, the actual load data for one day is stored in association with the day of the week. Incidentally, the power load amount of the power load device 11 includes the power measured by the commercial power measurement unit P1, the power generation output of the power generation device 2 measured by the combined heat and power generation power measurement unit P2, and the power generation power for the solar power generation device. From the sum of the generated power measured by the measuring unit P3, the power load amount of the electric heater 14 and the power load amount of the auxiliary machine unique to the energy supply system are subtracted. Note that the power measured by the commercial power measuring unit P1 indicates power that is positive in the direction of receiving power from the commercial system 9, and thus a negative value when power is flowing backward to the commercial system 9. I take the.
When the actual load data for one day is stored for one week, new past load data is obtained by adding the past load data and the actual load data at a predetermined ratio for each day of the week. New past load data is stored and the past load data is updated.

Specifically, taking Sunday as an example, as shown in FIG. 3, from the past load data D1m corresponding to Sunday among the past load data and the actual load data A1 corresponding to Sunday among the actual load data, New past load data D1 (m + 1) corresponding to Sunday is obtained by the following [Equation 1], and the obtained past load data D1 (m + 1) is stored.
In the following [Expression 1], D1m is past load data corresponding to Sunday, A1 is actual load data corresponding to Sunday, K is a constant of 0.75, and D1 (m + 1) is And new past load data.

When the predicted load calculation process is further described, it is executed each time the date is changed, and how much power load amount, hot water supply heat load amount, and heating heat load amount are predicted for which time zone of the day. It is comprised so that the estimated load data of may be calculated | required.
That is, out of the seven past load data for each day of the week, by adding the past load data corresponding to the day of the day and the actual load data of the previous day in a predetermined ratio, how much power load amount in which time zone, It is configured to obtain predicted load data for one day on the day of whether the hot water supply heat load amount and the heating heat load amount are predicted.

Specifically, the case of obtaining the predicted load data for one day on Monday will be described as an example. As shown in FIG. 3, seven past load data D1m to D7m for each day of the week and seven actual load data A1 for each day of the week are shown. ~ A7 are stored, the predicted load data for one day on Monday is calculated from the past load data D2m corresponding to Monday and the actual load data A1 corresponding to Sunday of the previous day by the following [Equation 2]. B is obtained.
As shown in FIG. 4, the predicted load data B for one day is predicted power load data for one day, predicted hot water supply heat load data for one day, predicted heating heat load data for one day. 4 (a) shows the predicted power load amount for one day, and (b) in FIG. 4 shows the predicted heating heat load amount for one day. C) shows the predicted hot water supply heat load for one day.
In the following [Expression 2], D2m is past load data corresponding to Monday, A1 is actual load data corresponding to Sunday, Q is a constant of 0.25, and B is a predicted load. Data.

  When the energy saving reference value calculation process is added, the combined heat and power supply device 3 is provided so as to cover the required hot water storage amount from the current time to the reference value time using the predicted hot water supply thermal load amount data. When operated, the combined heat and power supply device 3 is operated to obtain an energy saving reference value that can realize energy saving in the installation facility of the energy supply system.

  For example, assuming that the unit time is 1 hour and the reference value time is 12 hours, first, from the predicted power load amount, the predicted hot water supply heat load amount, and the predicted heating heat load amount based on the predicted load data, As shown in FIG. 5, by calculating [Equation 3], the predicted energy saving degree when the combined heat and power supply device 3 is operated is obtained for every 12 hours up to 12 hours ahead, and the combined heat and power supply device 3 is operated. In this case, the estimated amount of hot water that can be stored in the hot water storage tank 4 is obtained for 12 hours every 12 hours.

However, EK1 is a function with the effective power generation output E1 as a variable, EK2 is a function with the effective heating heat output E2 as a variable, EK3 is a function with the effective hot water storage heat output E3 as a variable,
EK1 = Equivalent power generation output E1 power plant primary energy equivalent value = f1 (Effective power generation output E1, required energy at the power plant)
EK2 = energy conversion value in conventional water heater of effective heating heat output E2 = f2 (effective heating heat output E2, burner efficiency (during heating))
EK3 = Equivalent hot water heat output E3 energy conversion value in conventional water heater = f3 (effective hot water heat output E3, burner efficiency (during hot water supply))
Required energy for the combined heat and power supply device 3: 5.5 kW
(The city gas consumption when the combined heat and power supply device 3 is operated for 1 hour is 0.433 m ³ )
Unit power generation required energy: 2.8kW
Burner efficiency (heating): 0.8
Burner efficiency (with hot water supply): 0.9

  Moreover, each of the effective power generation output E1, the effective heating heat output E2, and the effective hot water storage heat output E3 is obtained by the following [Expression 4] to [Expression 6].

但し、電気ヒータ１４の熱出力＝電気ヒータ１４の電力負荷量×ヒータの熱効率とする。

However, the heat output of the electric heater 14 = the power load amount of the electric heater 14 × the heat efficiency of the heater.

And in the state which calculated | required the prediction energy saving degree and prediction hot water storage amount for every 12 hours as shown in FIG. 5, first, the prediction required from the prediction hot water supply thermal load amount data to 12 hours ahead The required hot water storage amount is obtained, and the hot water storage amount in the hot water storage tank 4 at the present time is subtracted from the predicted required hot water storage amount to obtain the necessary hot water storage amount required up to 12 hours ahead.
For example, if a hot water supply heat load amount of 9.8 kW is predicted 12 hours later from the predicted hot water supply heat load data, and the current hot water storage amount in the hot water storage tank 4 is 2.5 kW, the time is 12 hours ahead. The required hot water storage required during this period is 7.3 kW.

  Then, in the state where the predicted amount of hot water storage for the unit time is added, until the predicted amount of stored hot water reaches the required amount of hot water, select from among the unit time for twelve units that has the highest predicted value of energy conservation. I try to keep going.

For example, as described above, when the required hot water storage amount is 7.3 kW, as shown in FIG. 5, first, from 7 hours ahead to 8 hours ahead where the predicted energy saving degree is the highest. Select the unit time and add the predicted hot water storage volume for that unit time.
Next, the unit time from 6 hours ahead to 7 hours ahead with high predicted energy conservation is selected, and the predicted hot water storage amount in the unit time is added, and the predicted hot water storage amount at that time is 1.1 kW. .
In addition, the unit time from 5 hours ahead to 6 hours ahead with the highest predicted energy saving is selected, and the predicted hot water storage amount in the unit time is added, and the predicted hot water storage amount at that time is 4.0 kW. Become.

In this way, when the selection of the unit time from the high predicted energy saving value and the addition of the predicted hot water storage amount are repeated, the unit from 8 hours ahead to 9 hours ahead as shown in FIG. When the time is selected, the predicted amount of hot water added together reaches 7.3 kW.
If it does so, the energy-saving degree of unit time from 8 hours ahead to 9 hours ahead will be set as an energy-saving reference value, and in the thing shown in FIG.

The operation availability determination process will be described. In the operation availability determination process, the actual power load amount, the predicted hot water supply heat load amount, and the current heating heat load amount are calculated according to the above [Equation 3]. Find energy savings.
When the actual energy saving level exceeds the energy saving level reference value, it is determined that the operation of the combined heat and power supply device 3 is possible. When the actual energy saving level is equal to or less than the energy saving level reference value, the operation of the combined heat and power supply unit 3 is determined. Is determined to be impossible.

That is, if the actual power load amount, the hot water supply heat load amount, and the heating heat load amount are substantially equal to the predicted power load amount data, the predicted hot water supply heat load amount data, and the predicted heating heat load amount data, the actual energy saving degree is reduced. Since it is substantially equal to the predicted energy saving level obtained in the energy reference value calculation processing, the combined heat and power supply device 3 is operated in a plurality of unit times selected in order of the time zone in which the predicted energy saving level is high so that the required hot water storage amount can be stored. Will be.
Therefore, the time zone composed of a plurality of unit times selected in order of the time zone with the highest predicted energy saving level so that the required hot water storage amount can be stored is the predicted heat load amount, the predicted power load amount, and the energy saving operation condition (energy saving level). It corresponds to the predicted operation time zone for operating the combined heat and power supply device 3 obtained based on And this energy-saving standard value calculation process is performed at intervals of several seconds, and once the operation of the cogeneration apparatus 3 is started, the operation is continued for at least one hour.

  That is, the operation control unit 7 is configured to obtain a time zone in which the energy saving degree P is high and the heat load amount or the power load amount is large as a predicted operation time zone for operating the combined heat and power supply device 3. In addition, the operation control unit 7 calculates the time-series predicted heat load amount and the time-series predicted power load amount in the determination target period of 1 day based on the time-series consumption data of heat and the time-series consumption data of power. The predicted operation time zone for operating the combined heat and power supply device 3 is determined based on the calculated and calculated predicted heat load amount and predicted power load amount and the energy saving operation condition (energy saving degree P), and the calculated predicted operation is obtained. The combined heat and power supply device 3 is configured to automatically operate based on the time zone.

As described above, the operation control unit 7 obtains the predicted operation time zone of the combined heat and power supply device 3 that causes the energy supply system to perform energy saving operation, and determines the combined heat and power supply device 3 based on the obtained predicted operation time zone. Although the automatic operation can be performed, the energy supply system can be operated at a reduced cost as described in the control flow of FIG.
That is, in this embodiment, since it is comprised so that the electric power generated by the solar power generation device PV can be sold to the commercial system 9, the combined heat and power supply device so that the power generated by the solar power generation device PV is surplus. If 3 is operated, there is a possibility that the cost saving of the energy supply system can be achieved. However, there is a possibility that power purchase from the commercial system 9 may be increased by operating the combined heat and power supply device 3 so that the electric power generated by the solar power generation device PV remains. Therefore, when the operation control unit 7 aims at cost saving of the energy supply system, the power sale fee of the power generated by the solar power generation device PV and the power purchase fee from the commercial system 9 are considered, The operation time zone of the combined heat and power supply device 3 that causes the energy supply system to operate at a reduced cost is obtained, and the combined heat and power supply device 3 is automatically operated based on the obtained operation time zone.

  In Step # 100 of FIG. 6, the operation control unit 7 predicts the operation of the combined heat and power supply device 3 for performing the main heat operation that generates the amount of heat that can cover the predicted heat load of the heat load device 5 when the date changes to midnight. Temporarily determine the time zone. As the predicted operation time zone, the predicted operation time zone of the combined heat and power supply device 3 that performs the energy saving operation described above can be used. And if it is not aimed at energy saving, if the operation | movement of the period which generate | occur | produces the heat quantity which can cover the estimated heat load amount of the heat load apparatus 5 is performed, the operation time slot | zone can be changed freely. That is, even if the operation time zone of the combined heat and power supply device 3 is provisionally determined as shown in FIG. 7 (a) for the purpose of energy saving, if the length of the operation period is maintained, the operation time zone is changed. By changing back and forth in terms of time, the combined heat and power supply device 3 can be operated in an operation time zone that saves costs.

  In step # 102, the operation control unit 7 derives the total operation cost while shifting the start time of the operation period by one hour. For example, when the energy saving operation is performed, the operation time start time as shown in FIG. 7 (b) is used for the cogeneration apparatus 3 that is scheduled to be operated in the time zone as shown by the solid line in FIG. 7 (a). Deriving the total operation cost when driving in the operation time zone where 0:00 is midnight. In addition, what is shown with the broken line of FIG. 7 (I) and FIG. 7 (B) is the predicted heat load (the predicted heating heat load amount shown in FIG. 4 (B) and the predicted hot water supply heat load amount shown in FIG. 4 (C)). It is. The operation total cost is calculated a plurality of times while changing the start time of the operation period.

  For example, the operation control unit 7 performs the combined heat and power supply in the time-series predicted power load device 11 in the discrimination target period of 1 day shown in FIG. 4 (a) and the operation time zone in FIG. 7 (b). Predicted power generation amount of the time-series combined heat and power supply device 3 shown in FIG. 7C predicted when the device 3 is operated, and prediction of the time-series solar power generation device PV shown in FIG. Based on the generated power amount, a time-series surplus power amount and an insufficient power amount are derived. The predicted power generation amount of the time-series solar power generation device PV is derived by the operation control unit 7. For example, the operation control unit 7 communicates via the communication unit 40 and the information communication line N as illustrated in FIG. Information on the amount of sunshine in time series is received from the weather information providing server S that is connected to the latitude and longitude where the solar power generation device 3 is installed, and the solar panel of the solar power generation device 3 with respect to the sun With reference to the installation posture such as the inclination, the rated output of the solar power generation device 3, and the like, the time-series predicted generated power amount in the solar power generation device PV is derived.

  Then, as shown in the following [Equation 7], the operation control unit 7 sells the power generated by the photovoltaic power generator PV in the surplus power shown in FIG. The cost calculation is performed using the power price and the time-series power purchase price when purchasing power from the commercial system 9, and the total charge of the power sale charge and the power purchase charge is derived as the total operation cost.

  Then, in step # 104, the operation control unit 7 is the most economical among the plurality of total charge data derived by shifting the start time of the operation period as described above, that is, the result of the lowest operation total cost. It is determined that the operation time zone when the above is obtained is an operation time zone in which cost saving can be achieved. And the operation control part 7 operates the cogeneration apparatus 3 in the operation time zone.

Second Embodiment
The present embodiment is different from the first embodiment in that the cost calculation includes the cost related to the amount of heat lost by the heat radiation in the hot water storage tank 4 in the total operation cost. Although the energy supply system of 2nd Embodiment is demonstrated below, the description similar to 1st Embodiment is abbreviate | omitted.

  In this energy supply system, the combined heat and power supply device 3 is configured to perform a heat main operation that generates a heat amount that can cover the predicted heat load amount of the heat load device 5, but as illustrated in FIGS. 4 and 7, In some cases, heat is consumed in the heat load device 5 after the cogeneration device 3 has finished storing hot water and a long time has passed. In such a case, heat dissipation occurs due to heat dissipation in the hot water storage tank 4. become. Therefore, the operation control unit 7 is configured to derive a total operation cost so that the heat radiation loss amount is included in the cost calculation, and to perform a cost-saving operation considering both the power supply and heat supply costs. Yes.

First, the operation control unit 7 uses a heat source device such as the above-described auxiliary heater 27 that directly generates heat using a fuel such as gas, and the electric power P _ex ( The predicted fuel charge M _ex-loss required when generating the amount of heat corresponding to the amount of heat released when t) is converted into heat by the electric heater 14 is derived.

Next, the operation control unit 7 uses a heat source device such as the auxiliary heater 27 that directly generates heat using a fuel such as gas, to generate heat generated by the combined heat and power supply device 3 and the electric heater 14 at time T1. _Estimated fuel charge M _st− required for generating a heat quantity corresponding to the heat radiation amount in the hot water storage tank 4 from the time when the recovery is started using the hot water storage tank 4 until the heat load is consumed by the thermal load device 5 at time T3. _{Derives loss} .

Then, the operation control unit 7 determines whether or not the inequality sign of the following [Equation 10] is established. When the inequality sign is established, the operation start time (hot water storage start time) T1 of the cogeneration device 3 and the cogeneration device are determined. No. 3 operation end time (hot water storage end time) T2 is incremented by 1, and the calculation is performed again. Further, when the inequality sign is not established, the cost-saving operation of the combined heat and power unit is performed in an operation time period in which T1 in which the left side to the right side of [Equation 10] is maximum is the operation start time. In [Expression 10], M _{pv ′} is the total charge of the power selling fee and the power buying fee.

<Third Embodiment>
The present embodiment is different from the first embodiment in that the cost calculation includes the cost related to the amount of heat obtained by operating the combined heat and power supply device 3 and the electric heater 14 in the total operation cost. Although the energy supply system of 3rd Embodiment is demonstrated below, the description similar to 1st Embodiment is abbreviate | omitted.

In the present embodiment, the operation control unit 7 is the energy supply system described with reference to the control flow in FIG. 6 except that the content of the cost calculation performed in step # 102 in FIG. 6 is different from that in the first embodiment. The same operation as the cost-saving operation is performed. For example, the operation control unit 7 derives the effective recovered heat amount H _eff per day based on the following [Equation 11]. However, the amount of heat generated by the combined heat and power supply device 3 at time t is represented by H _cgs (t), and the amount of heat recovered by the electric heater 14 from the surplus power generated at the time t at the combined heat and power supply device is represented by H It is represented by _ex (t), and the amount of heat stored in the hot water storage tank 4 at time 23:00 is represented by H _st (23). In [Formula 11], the amount of heat H _st (23) stored in the hot water storage tank 4 at time 23:00 is subtracted because it is an excess amount of heat that is not used, and is regarded as a heat loss. .

The operation control unit 7 generates a heat amount corresponding to the effective recovered heat amount H _eff derived as described above by a heat source device such as the auxiliary heater 27 that directly generates heat using a fuel such as gas. The estimated fuel charge M _eff (23) required for the calculation is derived. Then, the recovery of the effective recovered heat amount has eliminated the need to operate the heat source unit by spending the predicted fuel rate, so that the predicted fuel rate is operated as shown in [Equation 12]. Cost calculation can be performed by subtracting from the total cost.

In step # 104, the operation control unit 7 determines the operation time when the most economical result is obtained among the plurality of total fee data derived as described above, that is, the operation total cost is the smallest. The belt is determined to be an operation time zone in which cost saving can be achieved. The operation control unit 7 operates the combined heat and power supply device 3 during the operation time period.
Further, the cost calculation of the present embodiment may be included in the cost calculation of the second embodiment.

<Fourth embodiment>
The energy supply system according to the fourth embodiment is the first in that both the power generated by the solar power generation device PV and the power generated by the combined heat and power supply device 3 can be sold to the commercial system 9. Different from the embodiment. That is, all of the surplus power of the power generated by the solar power generation device PV and the power generated by the combined heat and power supply device 3 is reversely flowed (power sold) to the commercial system 9. Although the energy supply system of 4th Embodiment is demonstrated below, the description similar to 1st Embodiment is abbreviate | omitted.

  In the present embodiment, the operation control unit 7 is the energy supply system described with reference to the control flow in FIG. 6 except that the content of the cost calculation performed in step # 102 in FIG. 6 is different from that in the first embodiment. The same operation as the cost-saving operation can be performed. For example, the operation control unit 7 is predicted from the predicted power load amount of the time-series power load device 11 in the discrimination target period of 1 day shown in FIG. 4 (a) and the operation time zone of FIG. 7 (b). Based on the predicted power generation amount of the time-series cogeneration device 3 shown in FIG. 7 (c) and the predicted power generation amount of the time-series solar power generation device PV shown in FIG. A series of surplus power and insufficient power is derived. Then, as shown in the following [Equation 13], the operation control unit 7 time-sequentially sells the power generated by the photovoltaic power generator PV in the surplus power shown in FIG. Power selling price, time-series power selling price when selling power generated by the combined heat and power supply device 3 of surplus power, and time-series power buying when purchasing power from the commercial system 9 The cost is calculated using the price, and the total price of the power selling fee and the power buying fee is derived as the total operation cost.

  In step # 104, the operation control unit 7 determines the operation time when the most economical result is obtained among the plurality of total fee data derived as described above, that is, the operation total cost is the smallest. The belt is determined to be an operation time zone in which cost saving can be achieved. And the operation control part 7 operates the cogeneration apparatus 3 in the operation time zone.

<Another embodiment>
<1>
Although the said embodiment demonstrated the case where the operation control part 7 was comprised so that the thermoelectric cogeneration apparatus 3 might be automatically controlled so that the driving | running state of an energy supply system might be cost-saving, the user of this energy supply system When receiving a command for causing the cogeneration apparatus 3 to perform an operation giving priority to energy saving, the cogeneration apparatus 3 can be automatically controlled so that the energy efficiency of the energy supply system is saved. .

For example, when the “energy saving” button 53 of the remote controller R in FIG. 8 is turned on, the operation control unit 7 performs the combined heat and power supply for the energy saving operation of the energy supply system as described in the first embodiment. What is necessary is just to obtain | require the estimated operation time slot | zone of the apparatus 3, and to make the thermoelectric power supply apparatus 3 operate automatically based on the calculated | required estimated operation time slot | zone. That is, the cogeneration apparatus 3 may be operated in the predicted operation time zone for energy saving operation obtained in the first embodiment.
The user of this energy supply system can confirm that the combined heat and power supply device 3 is in an energy saving operation when the energy saving operation lamp 54 is lit.

<2>
In the above embodiment, the operation control unit 7 obtains an operation time zone of the combined heat and power supply device 3 that causes the energy supply system to perform cost-saving operation at midnight when the date changes, and based on the obtained operation time zone. Although the case where the cogeneration device 3 is automatically operated has been described, a similar operation time zone may be derived after midnight, and the thermoelectric power supply device 3 may be configured to automatically operate based on the operation time zone. it can. For example, when the predicted power generation amount of the solar power generation device PV derived based on the weather information re-received from the weather information providing server S is different from the initial predicted power generation amount, From the measurement result of the power measuring unit P3, when the predicted power generation amount of the solar power generation device PV as shown in FIG. The operation time zone of the combined heat and power supply device 3 for cost-saving operation of the energy supply system similar to that described above is obtained based on the new predicted power generation amount, and the combined heat and power supply device 3 is determined based on the obtained operation time zone. It can also be configured to operate automatically.

  Alternatively, when the operation control unit 7 recognizes from the measurement result of the generated power measurement unit P3 for the solar power generation device that the generated power amount of the solar power generation device PV is small or hardly generates power during the day, The operation time zone of the combined heat and power supply device 3 that causes the energy supply system as described in the embodiment to perform the energy saving operation is obtained, and the combined heat and power supply device 3 is saved from the cost-saving operation based on the obtained operation time zone. It can also be configured to automatically switch to driving.

<3>
In the above-described embodiment, the example in which the operation time zone of the combined heat and power supply device 3 that is cost-saving operation is derived in one operation time zone as illustrated in FIG. You may derive | lead-out the operation time slot | zone which becomes cost-saving after isolate | separating into plurality. For example, the operation control unit 7 determines the operation period as 1 hour, shifts the start time of the operation period by 1 hour, derives the operation total cost, and performs the operation necessary to cover the heat load amount of the heat load device 5. When the total length of the period is 7 hours, the start time of the top 7 operating periods with excellent economic efficiency is selected from the derived 24 operating total costs, and the 7 operating periods are selected. You may comprise so that the driving time slot | zone of a total of 7 hours obtained by combining may be determined as a driving time slot | zone which can achieve cost-saving driving | operation.

<4>
In the said 2nd Embodiment, the electric power generated with the solar power generation device PV among surplus electric power can be sold to the commercial system 9, and the electric power generated with the cogeneration apparatus 3 among surplus electric power is electric heater. The case where the heat is converted and recovered at 14 has been described, but the power generated by the combined heat and power supply device 3 in the surplus power may be sold to the commercial system 9. At that time, since all surplus power is sold to the commercial grid 9, the electric power P _ex (t) generated by the combined heat and power supply device 3 in the surplus power shown in [Equation 8] is heated by the electric heater 14. There is no predicted fuel charge M _ex-loss required for generating the amount of heat corresponding to the amount of heat lost when converting to. Therefore, in [Equation 9], the term H _ex (t) on the right side does not exist, but the rest is the same as in the second embodiment.

<5>
In the above embodiment, an energy supply system including a gas engine and a power generation device is illustrated as a combined heat and power supply device. However, other devices such as a fuel cell may be used as long as they can generate heat and electricity together. It can also be used to construct an energy supply system.

<6>
In the above embodiment, the amount of heat dissipation generated in the hot water storage tank 4 that stores the amount of heat generated in the combined heat and power supply device 3 is calculated, and the above-described auxiliary heater 27 that directly generates heat using a fuel such as gas. In the present embodiment, the operation control unit 7 is configured to include a combined heat and power device. However, in the present embodiment, the operation control unit 7 is configured to include a predicted fuel charge required when the heat source unit generates a heat amount corresponding to the heat release amount. 3 derives a loss compensation operation time required to generate a loss compensation heat load amount corresponding to the heat dissipation loss amount, and the operation of the combined heat and power supply device 3 required when the combined heat and power supply device 3 performs the loss compensation operation time. The cost is configured to be included in the cost calculation.

The loss-compensating heat load amount H _add corresponding to the heat dissipation loss amount is a heat dissipation amount lost when the surplus power P _ex (t) generated by the combined heat and power supply device 3 is converted into heat by the electric heater 14, and Release of heat in the hot water storage tank 4 from the start of recovery of heat generated by the combined heat and power supply device 3 and the electric heater 14 at time T1 using the hot water storage tank 4 until heat consumption at the thermal load device 5 at time T3. It is derived by the total amount of heat and is expressed by the following [Equation 14]. When surplus power P _ex (t) generated by the combined heat and power supply device 3 is caused to flow backward to the commercial grid 9, P _ex (t) = 0 and H _ex (t) in the following [Equation 14] = 0.

The operation control unit 7 derives the loss compensation operation time of the cogeneration device 3 required for generating the loss compensation heat load H _add in the cogeneration device 3, and the cogeneration device 3 operates in the loss operation period. The operation cost of the combined heat and power supply device 3 required when performing the operation is derived. In the case where the combined heat and power supply device 3 is configured to include a gas engine that uses gas as fuel and a power generation device that is driven by the gas engine, the gas charge that the gas engine uses as fuel is the operating cost of the combined heat and power supply device 3. become. In the case where the combined heat and power supply device 3 is composed of a fuel cell, the charge for hydrogen gas used as the fuel by the fuel cell, or the charge for the gas or alcohol used as raw fuel for generating hydrogen gas is the combined heat and power supply device 3. The operating cost becomes.

  Then, the operation control unit 7 adds the derived loss compensation operation time to the operation time zone illustrated in FIG. 7B in the above embodiment, and includes the derived operation cost in the cost calculation. Similar to the embodiment, the operation total cost is calculated several times while changing the start time of the operation period, and the operation time zone when the result with the smallest operation total cost is obtained can achieve the cost saving. It is determined to be a belt.

Block diagram showing the overall configuration of the energy supply system Block diagram showing control configuration of energy supply system Diagram explaining data update process Diagram showing time-series data The figure explaining energy-saving standard calculation processing Control flow for cost-saving operation Diagram showing time-series data The figure which shows the example of a display of a remote control and its display part

Explanation of symbols

3 Cogeneration device 5 Heat load device 7 Operation control unit (control means)
9 Commercial power system 11 Electric power load device PV Photovoltaic power generation device

Claims (6)

A combined heat and power device that generates heat and electricity; a solar power generation device; and a power load device that receives power from at least one of the thermoelectric power supply device, the solar power generation device, and a commercial power system. An energy supply system provided with a heat load device that receives supply of heat from the cogeneration device, and a control means for controlling the operation of the cogeneration device,
The control means is
Predicting the time-series predicted thermal load amount in the determination target period for the thermal load device,
The time-series predicted generated power amount in the determination target period of the combined heat and power generation device generated when performing the main heat operation that generates the heat amount that can cover the predicted heat load amount, and the solar power generation device Time-series predicted generated power amount in the determination target period, time-series predicted power load amount in the determination target period of the power load device, and time-series sales to the commercial power system in the determination target period Cost for supplying power and heat to the power load device and the heat load device derived by cost calculation based on a power charge and a time-series power purchase charge in the discrimination target period from the commercial power system However, at the time of operation of the combined heat and power unit for performing the main heat operation so as to save costs under the condition that at least the power generated by the solar power generation device can be sold. Defining a band in the determination period, it is configured to operate the cogeneration device to the operating time period,
The operating time period, the determination period energy supply system that is defined at the start of the cogeneration system.   The energy supply system of Claim 1 comprised so that the electric power generated by both the said solar power generation device and the said combined heat and power supply device can be sold. The control means is
Deriving the amount of heat radiation loss that occurs in the storage device that stores the amount of heat generated in the cogeneration device,
The energy according to claim 1 or 2, wherein a heat source device that directly generates heat using fuel includes a predicted fuel charge required for generating a heat amount corresponding to the heat dissipation loss amount in the cost calculation. Supply system. The control means is
Deriving the amount of heat radiation loss that occurs in the storage device that stores the amount of heat generated in the cogeneration device,
Deriving the loss compensation operation time of the heat and power cogeneration device required to generate the amount of heat corresponding to the heat dissipation loss in the cogeneration device,
3. The energy supply system according to claim 1, wherein the cost calculation includes an operation cost of the cogeneration apparatus required when the cogeneration apparatus is operated for the loss compensation operation time. 4.   Energy efficiency when supplying electric power and heat to the power load device and the heat load device when the control means receives a command to make the heat and power cooperating device perform an operation giving priority to energy saving. An operation time zone of the combined heat and power device for performing the main heat operation is determined so as to save energy, and the combined heat and power device is operated during the operation time zone. The energy supply system according to any one of claims.   The said control means is comprised so that the prediction generated electric energy of the said photovoltaic power generation apparatus may be estimated based on the weather forecast information provided via an information communication line. The energy supply system described.

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