Energy storage destination selection apparatus and energy storage destination selection method

Abstract

To select an energy storage device capable of efficiently utilizing energy in a heat storage device and a power storage device.SOLUTION: An energy storage destination selection apparatus 100 comprises: a use period calculation section 113 for calculating a stored heat use end time that is the time at which an energy load device ends the use of energy stored in a heat storage device 360 or a stored power use end time that is the time at which an energy load device 370 ends the use of energy stored in a power storage device 330 and defining the calculated time as a use end time; a usable energy amount calculation section 115 for calculating usable energy amounts in the use end time in a case where energy generated by an energy generation device 310 is stored in the heat storage device 360 and the power storage device 330; and a storage destination selection section 116 which compares the two usable energy amounts and selects the device with the larger usable energy amount as a storage destination of energy which is generated by the energy generation device 310.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an energy storage destination selection device and an energy storage destination selection method for selecting an energy storage destination. [Background technology]

[0002] Renewable energy sources such as solar and wind power are difficult to control because their output is dependent on the weather. To solve this problem, it is necessary to store excess generated energy and use the stored energy to compensate for the unstable output of renewable energy sources when there is a shortage. Storing energy to compensate for the unstable output of renewable energy sources and operating them efficiently are key elements in utilizing renewable energy. The most common method for storing renewable energy is to use energy storage devices, but energy storage devices are expensive, so reducing their implementation costs is necessary for widespread use.

[0003] Looking at Japan's final energy consumption, heat utilization accounts for approximately 65% ​​of final energy consumption in the residential sector, approximately 50% in the commercial sector, and approximately 56% in the industrial sector. With the aim of utilizing heat, which accounts for the majority of energy consumption, some power storage devices are sometimes replaced with inexpensive thermal storage devices. When using a combination of power storage devices and thermal storage devices, technology is needed to determine which device should be prioritized for energy storage to enable more efficient energy usage.

[0004] Patent Documents 1 to 3 describe technologies for systems that use a power storage device and a heat storage device to operate renewable energy. Patent Document 1 discloses a power management device that creates an optimal operation plan for the energy storage device. The power management device in Patent Document 1 creates an operation plan by taking into consideration in advance the efficiency of the heat storage device due to the outside temperature, limitations on the charge / discharge current of the power storage device, limitations on the charge current due to the amount of power charged to the power storage device, and the like.

[0005] Furthermore, Patent Document 2 discloses an energy management system that automatically controls the supply destination of electricity generated using natural energy in response to the electricity selling price, which fluctuates over time, thereby creating greater cost benefits. The energy management system in Patent Document 2 consults electricity selling price information and electricity purchasing price information with electricity usage rules to determine the priority order of multiple supply destination candidates, and switches to the supply destination candidate with the highest priority in order to supply surplus electricity to the destination.

[0006] Furthermore, Patent Document 3 discloses a residential power management system that can predict the occurrence of grid-side voltage suppression in advance and switch the use of surplus power generated by a solar power generation system from selling it to the grid to storing it as energy. In the residential power management system of Patent Document 3, a power control means determines the priority of whether to store the surplus generated power in a power storage device (storage battery) of an energy storage device or to store it as thermal energy in a heat storage device. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5959783 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-078238 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-172334 Summary of the Invention [Problem to be solved by the invention]

[0008] In a power management device such as that disclosed in Patent Document 1, an operation plan is formulated based on the characteristics of the energy storage device, whose characteristics change significantly depending on the outside temperature, and on information about the electricity rate system, so that an operation plan can be executed with reduced operation costs. However, although the efficiency of the heat storage device depending on the outside temperature, limitations on the charge / discharge current of the power storage device, and limitations on the charge current due to the amount of charged power in the power storage device are considered in advance, the heat loss during the storage period of the heat storage device is not considered.

[0009] Furthermore, in the energy management system described in Patent Document 2, power usage rules are set in which the priorities of multiple potential recipients of surplus power correspond to the unit prices for selling and purchasing power. Furthermore, because power storage and heat storage are determined based on the temperature, it is possible to improve the cost performance of utilizing power generated by a power generation device that uses natural energy. However, while the power usage rules change the criteria for determining whether to store surplus power as power or heat depending on the temperature, as in Patent Document 1, they do not take into account heat loss during the storage period of the heat storage device. This results in the problem of purchasing more power than necessary.

[0010] The residential power management system described in Patent Document 3 can predict the occurrence of grid-side voltage suppression in advance and switch the use of surplus power generated by a solar power generation system from selling it to the grid to storing it as energy. The user can set in advance whether to store the surplus power in a power storage device or store it as thermal energy in a thermal storage device. However, it is difficult for the user to determine whether to prioritize energy storage in the power storage device or the thermal storage device to use energy more efficiently.

[0011] The present invention has been made in view of the above background, and an object of the present invention is to provide an energy storage destination selection device and an energy storage destination selection method that enable selection of an energy storage device that can efficiently utilize energy from among heat storage devices and power storage devices. [Means for solving the problem]

[0012] In order to solve the above-mentioned problems, the energy storage destination selection device of the present invention includes a usage period calculation unit that calculates a thermal storage usage end time, which is the time when an energy load device finishes using energy stored in a thermal storage device, or a power storage usage end time, which is the time when an energy load device finishes using energy stored in a power storage device, and sets the calculated usage end time as the usage end time; a usable energy amount calculation unit that calculates the amount of energy usable at the usage end time when energy generated by an energy generation device is stored in the thermal storage device, and the amount of energy usable at the usage end time when energy generated by the energy generation device is stored in the power storage device; and a storage destination selection unit that compares the usable energy amounts of the power storage device and the thermal storage device at the usage end time and selects the larger one as the storage destination for the energy generated by the energy generation device. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide an energy storage destination selection device and an energy storage destination selection method that enable selection of an energy storage device that can efficiently utilize energy from among a heat storage device and an electricity storage device. Problems, configurations, and effects other than those described above will become clear from the description of the following embodiments. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is an overall configuration diagram of a power management system including a functional block diagram of an energy storage destination selector according to a first embodiment. [Figure 2] 10 is a graph for explaining the end time of heat storage use according to the first embodiment. [Figure 3] 4 is a graph for explaining the amount of available energy over time according to the first embodiment. [Figure 4] 4 is a flowchart of an energy storage destination selection process according to the first embodiment. [Figure 5] 10 is a flowchart of a usage period calculation process according to the first embodiment. [Figure 6] FIG. 10 is a functional block diagram of an energy storage destination selection device according to a second embodiment. [Figure 7] 10 is a flowchart of a heat radiation proportionality constant update process according to the second embodiment. [Figure 8] FIG. 10 is a functional block diagram of an energy storage destination selection device according to a third embodiment. [Figure 9] 10 is a flowchart of an energy storage destination selection process according to the third embodiment. [Figure 10] FIG. 10 is a functional block diagram of an energy storage destination selection device according to a fourth embodiment. [Figure 11] 10 is a flowchart of an energy storage destination selection process according to the fourth embodiment. [Figure 12] FIG. 10 is an overall configuration diagram of a power management system according to a fifth embodiment. [Figure 13] 13 is a flowchart of an energy storage destination selection process according to the fifth embodiment. [Figure 14] FIG. 10 is an overall configuration diagram of a power management system according to a sixth embodiment. [Figure 15] 13 is a flowchart of an energy storage destination selection process according to the sixth embodiment. [Figure 16] FIG. 2 is a hardware configuration diagram illustrating an example of a computer that realizes the functions of the energy storage destination selection device according to the above embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] <Outline of the energy storage destination selection device> The following describes an energy storage destination selection device in a power management system including an energy generation device, a power storage device, a heat storage device, an energy load device, and an energy storage destination selection device in an embodiment for carrying out the present invention. First, the energy storage destination selection device calculates the heat storage use end time, which is the time when all of the energy stored in the heat storage device will be used by the energy load device.

[0016] Next, the energy storage destination selection device calculates the amount of energy (usable energy amount) that can be used at the end time of thermal storage use when the energy generated by the energy generation device is stored in the power storage device and the thermal storage device, respectively.The energy storage destination selection device then selects the power storage device or the thermal storage device with the largest amount of usable energy and stores the energy generated by the energy generation device in that device.

[0017] The calculation of the end time of thermal storage use, the calculation of the amount of usable energy at the end time of thermal storage use, the selection of an energy storage device (electricity storage device or heat storage device), and the storage of energy are periodically repeated. Details of the calculation of the end time of thermal storage use and the amount of usable energy, and the selection of an energy storage device will be described later.

[0018] The energy storage destination selection device calculates the amount of usable energy taking into account self-discharge in the power storage device and heat loss due to heat radiation in the heat storage device, and selects a storage destination for the energy generated by the energy generation device. In this way, the energy generated by the energy generation device can be stored and used efficiently with little heat loss due to self-discharge and heat radiation.

[0019] <Configuration of the power management system> 1 is an overall configuration diagram of a power management system 10 including a functional block diagram of an energy storage destination selection device 100 according to the first embodiment. The power management system 10 is configured to include the energy storage destination selection device 100, an energy generation device 310, path switching devices 320 and 350, a power storage device 330, a heat pump 340, a heat storage device 360, and an energy load device 370.

[0020] The energy generation device 310 is a power generation device that uses renewable energy such as sunlight, solar heat, or wind power. The path switching device 320 is a device that switches the destination of the power (energy) generated by the energy generation device 310 between the power storage device 330 and the heat pump 340. The power storage device 330 stores the power generated by the energy generation device 310. The stored power is sent to the energy load device 370 via the heat pump 340 and the path switching device 350 and is used (consumed).

[0021] The heat pump 340 uses the power generated by the energy generation device 310 or the power stored in the power storage device 330 to heat or cool a heat medium, for example, and transfer heat. The destination of the heat (heat medium) is switched by the path switching device 350 between the heat storage device 360 ​​and the energy load device 370. The heat storage device 360 ​​stores the power generated by the energy generation device 310 as thermal energy. The stored thermal energy is used by the energy load device 370.

[0022] The energy load device 370 is a device that includes, for example, a heat exchanger and heats or cools a target object or a target space by exchanging heat with a heat medium. Examples of the energy load device 370 include air conditioning equipment, water heaters, heating equipment, refrigeration equipment, and freezing equipment. When the energy load device 370 is a water heater or heating equipment, the heat storage material of the heat storage device 360 ​​becomes hot. When the energy load device 370 is a refrigeration equipment or freezing equipment, the heat storage material of the heat storage device 360 ​​becomes cold. It may be noted that even if the heat storage material is cold, thermal energy is stored in the heat storage device 360.

[0023] 1, dashed lines between the energy generation device 310, the path switching device 320, the power storage device 330, and the heat pump 340 indicate the flow of power (electrical energy). Dashed lines between the heat pump 340, the path switching device 350, the heat storage device 360, and the energy load device 370 indicate the flow of heat (thermal energy), including between the path switching device 350 and the energy load device 370.

[0024] Communication is possible between the energy storage destination selection device 100 and the energy generation device 310, the path switching devices 320 and 350, the power storage device 330, the heat pump 340, the thermal storage device 360, and the energy load device 370. In response to an instruction from the energy storage destination selection device 100, the path switching device 320 switches the destination of the power generated by the energy generation device 310 between the power storage device 330 and the heat pump 340. In response to an instruction from the energy storage destination selection device 100, the path switching device 350 switches the destination of the thermal energy (heat medium) generated by the heat pump 340 between the thermal storage device 360 ​​and the energy load device 370.

[0025] Furthermore, the energy storage destination selection device 100 can acquire state quantities of the power storage device 330 and the heat storage device 360. The state quantities include the battery voltage of the power storage device 330 and the heat storage material temperature of the heat storage device 360. The power storage device 330 and the heat storage device 360 ​​are collectively referred to as an energy storage device. The battery voltage of the power storage device 330 may be simply referred to as the voltage (of the power storage device 330), and the heat storage material temperature of the heat storage device 360 ​​may be simply referred to as the temperature (of the heat storage device 360).

[0026] <Configuration of the energy storage destination selection device> The energy storage destination selection device 100 is a computer, and includes a control unit 110, a storage unit 120, and an input / output unit 180. User interface devices such as a display, keyboard, and mouse are connected to the input / output unit 180. The input / output unit 180 includes a communication device, and is capable of communicating with the path switching devices 320 and 350, the power storage device 330, the heat storage device 360, and the like.

[0027] <Energy storage destination selection device: memory unit> The storage unit 120 is configured to include storage devices such as a read-only memory (ROM), a random access memory (RAM), and a solid-state drive (SSD). The storage unit 120 stores a heat dissipation proportionality constant database 130, a usage plan 121, weather information 122, and a program 128. Note that the various storage contents of the storage unit 120 may be stored in an external storage device such as a cloud server and read as needed.

[0028] The heat dissipation proportional constant database 130 stores the heat dissipation proportional constant of the heat storage material used in the heat storage device 360. To explain in more detail, the heat dissipation proportional constant database 130 stores the heat dissipation proportional constant of the heat storage material associated with the material and volume. The usage plan 121 is a usage plan for the energy load device 370. For example, the usage plan 121 stores a usage schedule for air conditioning equipment for each time period. The weather information 122 stores weather forecasts such as the weather, temperature, wind direction, and wind speed. The program 128 includes a description of the processing of the control unit 110 in addition to the energy storage destination selection processing (see FIG. 4) described later.

[0029] <Energy storage destination selection device: control unit> The control unit 110 is configured to include a CPU (Central Processing Unit) and is equipped with a power generation amount prediction unit 111, a demand amount prediction unit 112, a usage period calculation unit 113, a stored energy amount calculation unit 114, a usable energy amount calculation unit 115, and a storage destination selection unit 116.

[0030] <Control unit: Power generation prediction unit> The power generation amount prediction unit 111 predicts the amount of energy (power generation amount) generated by the energy generation device 310 for each time (time period). For example, if the energy generation device 310 is a windmill, the power generation amount prediction unit 111 predicts the power generation amount for each time (time period) based on the wind direction and wind speed in the weather information 122.

[0031] <Control unit: Demand forecast unit> The demand prediction unit 112 predicts the amount of energy used by the energy load device 370. For example, if the energy load device 370 is an air conditioning facility, the demand prediction unit 112 predicts the amount of energy used by the air conditioning facility based on the usage plan 121 and weather information 122.

[0032] <Control unit: Usage period calculation unit> The usage period calculation unit 113 calculates the time when the energy load device 370 will finish using (consuming) the thermal energy stored in the thermal storage device 360. Hereinafter, this time when use will finish will also be referred to as the thermal storage use end time.

[0033] FIG. 2 is a graph for explaining the end time of thermal storage use according to the first embodiment. The solid line graph shows the change over time in the amount of energy stored in the thermal storage device 360 ​​and available for use (amount of available energy). The dashed line graph shows the amount of energy demand of the energy load device 370. The amount of energy demand is calculated at time T M The amount of available energy in the thermal storage device 360 ​​is a constant value except for the decrease in the amount of available energy at the start time T START It decreases from E0 at time T M The rate of decrease changes at time T END At this time T END is the end time of heat storage use.

[0034] The usage period calculation unit 113 calculates the usage period from the start time T START The usage period calculation unit 113 repeatedly calculates the total amount of energy used by integrating the demand amount of the energy load device 370 at each predetermined period, starting from the start time T START The time when the amount of thermal energy stored (E0) matches the total amount of demand is calculated as the end time of thermal storage use. Details of the calculation process will be described later using Figure 5.

[0035] The usage period calculation unit 113 calculates the start time T STARTThe usage period calculation unit 113 may calculate the end time of the power storage usage as the time when the amount of energy stored in the power storage device 111 matches the total amount of energy demand. The usage period calculation unit 113 may also calculate the end time of the power storage usage as the end time of the power storage usage.

[0036] As described above, the energy storage destination selection device 100 includes a usage period calculation unit 113 that calculates the heat storage usage end time, which is the time when the energy load device 370 finishes using the energy stored in the heat storage device 360, or the electricity storage usage end time, which is the time when the energy load device 370 finishes using the energy stored in the electricity storage device 330, and sets the calculated time as the usage end time. The usage period calculation unit 113 calculates the usage period of the energy load device 370 at a predetermined period (a processing unit time t STEP The energy demand for each of the power storage devices is integrated and compared with the amount of energy stored in the power storage device or the heat storage device, thereby calculating the end time of use.

[0037] <Control unit: stored energy amount calculation unit> Returning to Fig. 1, the explanation of the control unit 110 will be continued. The stored energy amount calculation unit 114 calculates the amount of energy stored in the power storage device 330 and the heat storage device 360. Methods for calculating the stored amount of power in the power storage device 330 include a method of calculating it from an open circuit voltage value and a method of finding it from an integrated value of charged and discharged current, but other methods may also be used. Methods for calculating the stored heat amount in the heat storage device 360 ​​include a method of calculating it based on the temperature of the heat storage device 360 ​​(heat storage material temperature) and a method of calculating it from the input and output of thermal energy to and from the heat storage device 360, but other methods may also be used.

[0038] <Control unit: Usable energy amount calculation unit> The available energy amount calculation unit 115 calculates the available energy amount, which is the amount of energy stored in the power storage device 330 and the heat storage device 360 ​​at a certain time and is the amount of energy that can be used (consumed). The available energy amount calculation unit 115 assumes that the energy generated by the energy generation device 310 is stored at the time of calculation, and calculates the amount of energy that remains (is available) until a certain time when the stored energy decreases due to heat loss caused by self-discharge or heat radiation. The certain time is, for example, the end time of thermal storage use or the end time of power storage use.

[0039] 3 is a graph illustrating the amount of usable energy over time according to the first embodiment. The solid line graph shows the amount of usable energy of the power storage device 330. The dashed line graph shows the amount of usable energy of the heat storage device 360 ​​when the outside temperature is high. The dotted line graph shows the amount of usable energy of the heat storage device 360 ​​when the outside temperature is low. In the following description, it is assumed that the energy load device 370 is a water heater or heating equipment, and that when energy is stored, the heat storage material of the heat storage device 360 ​​becomes hot.

[0040] The change in the amount of usable energy of the power storage device 330 is due solely to self-discharge, and no significant change is observed over the course of several days. However, due to the conversion efficiency when charging and discharging power to the energy generation device 310 and the energy conversion efficiency when converting direct current to alternating current to drive the heat pump 340, the amount of usable energy tends to be smaller than that of the heat storage device 360 ​​in the short period immediately after storage.

[0041] The amount of usable energy in the heat storage device 360 ​​decreases as the storage period becomes longer. In high-temperature heat storage, the amount of usable energy decreases faster when the outside temperature is low than when the outside temperature is high, even for the same storage period. The amount of usable energy in the power storage device 330 or heat storage device 360 ​​lost due to the conversion efficiency or storage period becomes energy loss.

[0042] When the outside air temperature is low, the amount of usable energy in the heat storage device 360 ​​is greater than that in the power storage device 330 until time T. Therefore, if the stored energy is to be used by time T, storing it in the heat storage device 360 ​​rather than in the power storage device 330 results in less energy loss and allows for more efficient energy use.

[0043] Below, we will explain the method used by the available energy amount calculation unit 115 to calculate the amount of available energy at the end time of thermal storage use in each of the power storage device 330 and the thermal storage device 360. First, we will explain the power storage device 330. When the power storage device 330 is used as the storage destination, the energy flows through the energy generation device 310, the path switching device 320, the power storage device 330, the heat pump 340, the path switching device 350, and the energy load device 370 (see FIG. 1).

[0044] <Calculating the amount of usable energy of a power storage device> The power E generated by the energy generating device 310 at the start of storage RE is stored in the storage device 330, and the conversion efficiency is η E , and the self-discharge rate is D. The power E generated by the energy generating device 310 RE is calculated by the power generation amount prediction unit 111. The remaining energy amount E of the power storage device 330 after the lapse of time t BAT is expressed by the following formula: E BAT =E RE ×η E ×D t

[0045] This remaining energy amount E BAT The amount of energy E output by driving the heat pump 340 using HP is calculated using the following formula, where C is the coefficient of performance. E HP =C×E BAT

[0046] This E HP The amount of available energy E in the energy load device 370 after t hours have elapsed when the power storage device 330 is used. E(t). E E (t)=E HP =C×E BAT =C×η E ×E RE ×D t

[0047] <Calculating the amount of usable energy in a thermal storage device> Next, a description will be given of the heat storage device 360. When the heat storage device 360 ​​is used as the storage destination, the energy flows through the energy generation device 310, the path switching device 320, the heat pump 340, the path switching device 350, the heat storage device 360, and the energy load device 370 (see FIG. 1). The power E generated by the energy generating device 310 RE The amount of energy E output by driving the heat pump 340 using HP is calculated using the following formula, where C is the coefficient of performance. E HP =C×E RE

[0048] The initial temperature of the heat storage device 360 ​​is T0, and the outside temperature is T A When the heat radiation proportionality constant is k, the temperature T of the heat storage device 360 ​​after t time has elapsed is calculated by the following formula: The heat radiation proportionality constant k is stored in the heat radiation proportionality constant database 130. T=(T0-T A )×e -kt +T A

[0049] The ratio F of the thermal energy stored in the thermal storage device 360 ​​that can be used by the energy load device 370 is calculated by the temperature of the thermal energy in the energy load device 370, T U It is calculated using the following formula: F=(TT U ) / (T0-T U )

[0050] Then, when the heat storage device 360 ​​is used, the amount of usable energy E in the energy load device 370 after t hours has elapsed is H (t) is calculated using the following formula: ηH is the conversion efficiency. E H (t)=E HP ×η H ×F =C×E RE ×η H × ((T0-T A )×e -kt +T A -T U ) / (T0-T U )

[0051] As described above, the energy storage destination selection device 100 includes the usable energy amount calculation unit 115 that calculates the amount of usable energy at the end of use when the energy generated by the energy generation device 310 is stored in the heat storage device 360, and the amount of usable energy at the end of use when the energy generated by the energy generation device 310 is stored in the power storage device 330.

[0052] The available energy amount calculation unit 115 calculates the available energy amount of the heat storage device 360 ​​based on the heat loss characteristics of the heat storage device 360 ​​. The available energy amount calculation unit 115 calculates the available energy amount of the power storage device 330 based on the self-discharge rate of the power storage device 330.

[0053] <Control unit: Storage destination selection unit> Returning to FIG. 1, the explanation of the control unit 110 will be continued. The storage destination selection unit 116 selects the amount of available energy E E (t) and the amount of usable energy E when using the heat storage device 360 H (t), and the larger energy storage device (electricity storage device 330 or heat storage device 360) is selected as the storage destination.

[0054] Next, the storage destination selection unit 116 instructs the path switching devices 320 and 350 to switch so that the electric energy generated by the energy generation device 310 is stored in the selected storage destination. If the storage destination is the power storage device 330, the flow of the electric energy generated by the energy generation device 310 will be the path switching device 320 and the power storage device 330. If the storage destination is the heat storage device 360, the flow of the electric energy generated by the energy generation device 310 will be the path switching device 320, the heat pump 340, the path switching device 350, and the heat storage device 360.

[0055] As described above, the energy storage destination selection device 100 includes the storage destination selection unit 116 that compares the available energy amounts of the power storage device 330 and the heat storage device 360 ​​at the end time of use and selects the larger one as the storage destination for the energy generated by the energy generation device 310.

[0056] <Energy storage destination selection process> FIG. 4 is a flowchart of the energy storage destination selection process according to the first embodiment. The energy storage destination selection process is executed at a predetermined timing, for example, periodically. In the energy storage destination selection process, the energy storage destination selection device 100 determines the process start time as time 0 and calculates the thermal storage use end time from the amount of energy remaining in the thermal storage device 360 ​​at time 0. The thermal storage use end time can be simply calculated by dividing the remaining energy amount at time 0 by the amount of thermal energy consumed per unit time, and is the time when the remaining energy amount becomes 0. Details of the calculation of the thermal storage use end time will be described later with reference to FIG. 5.

[0057] Next, the energy storage destination selection device 100 selects an energy storage device with a large amount of usable energy at the end time of thermal storage use as a storage destination for the electric energy generated by the energy generation device 310. A storage destination with a large amount of usable energy means that the loss of stored energy is small, and that the energy can be stored efficiently until the end time of thermal storage use. Note that when the energy storage destination selection process is executed periodically, the energy storage device to store the energy may change depending on the period.

[0058] In step S11, a process for calculating the usage period of the stored heat energy, which is the energy stored in the heat storage device 360, is executed. By this usage period calculation process, the start time of the energy storage destination selection process is set to time 0 (T START =0), and the end time of thermal storage use (T END The details of the usage period calculation process will be described later with reference to FIG.

[0059] In step S12, the available energy amount calculation unit 115 calculates the heat storage use end time (T END ) The amount of usable energy E of the heat storage device 360 H (T END ) is calculated. In step S13, the available energy amount calculation unit 115 calculates the heat storage use end time (T END ) the amount of usable energy E E (T END ) is calculated.

[0060] In step S14, the storage destination selection unit 116 selects E H (T END ) is E E (T END ) (step S14→YES), proceed to step S15, and E (T END ) or less (step S14→NO), proceed to step S16.

[0061] In step S15, the storage destination selection unit 116 selects the heat storage device 360 ​​as the storage destination and instructs the path switching devices 320 and 350 so that the flow of energy generated by the energy generation device 310 is from the path switching device 320 to the heat pump 340, the path switching device 350, and the heat storage device 360. In step S16, the storage destination selection unit 116 selects the power storage device 330 as the storage destination, and instructs the path switching device 320 to direct the flow of energy generated by the energy generation device 310 to the path switching device 320 and the power storage device 330.

[0062] <<Usage period calculation process>> 5 is a flowchart of the usage period calculation process according to the first embodiment. The usage period calculation unit 113 calculates the total demand amount of the energy load device 370 for each processing unit time of a predetermined length, and compares it with the amount of energy already stored in the heat storage device 360 ​​(remaining energy amount), thereby calculating the end time of the heat storage use.

[0063] In step S21, the usage period calculation unit 113 sets the time t to 0 and the cumulative energy demand W of the energy load device 370 to 0. In step S22, the stored energy amount calculation unit 114 calculates the remaining energy amount E of the heat storage device 360 ​​(the amount of thermal energy stored in the heat storage device 360 ​​at the start of processing). In step S23, the usage period calculation unit 113 starts the process of repeating steps S24 to S26.

[0064] In step S24, the demand prediction unit 112 calculates the demand P(t) of the energy load device 370 at time t and adds it to the cumulative energy demand W. The demand P(t) is calculated by multiplying the energy demand of the energy load device 370 per unit time at time t by the processing unit time (t STEP (see reference).

[0065] In step S25, if the cumulative energy demand W is equal to or greater than the remaining energy amount E (step S25→YES), the usage period calculation unit 113 sets the time t as the thermal storage use end time and ends the usage period calculation process. If the cumulative energy demand W is less than the remaining energy amount E (step S25→NO), the usage period calculation unit 113 proceeds to step S26. In step S26, the usage period calculation unit 113 calculates the processing unit time t STEP and return to step S24.

[0066] <Features of the energy storage destination selection device> The energy storage destination selection device 100 calculates the thermal storage use end time when the energy load device 370 will finish using all of the energy stored in the thermal storage device 360. Next, the energy storage destination selection device 100 calculates the amount of usable energy at the thermal storage use end time when the energy generated by the energy generation device 310 is stored in the power storage device 330 and the thermal storage device 360. The energy storage destination selection device 100 selects the energy storage device with the largest amount of usable energy and stores the energy generated by the energy generation device 310 in it.

[0067] When calculating the amount of usable energy, the energy storage destination selection device 100 takes into consideration factors such as heat loss due to heat radiation in the heat storage device 360, self-discharge in the power storage device 330, and conversion efficiency. In this way, the energy storage destination selection device 100 can efficiently use the energy generated by the energy generation device 310.

[0068] Second Embodiment In the first embodiment, the heat dissipation proportionality constant referenced when calculating the amount of usable energy of the heat storage device 360 ​​is a fixed value stored in the heat dissipation proportionality constant database 130. However, in reality, the heat dissipation proportionality constant is a value that changes due to individual differences and deterioration of the heat storage device 360. In the second embodiment, the heat dissipation proportionality constant is updated based on the measured value of the heat storage device 360.

[0069] Second Embodiment: Configuration of Energy Storage Destination Selection Device 6 is a functional block diagram of an energy storage destination selection device 100A according to the second embodiment. Compared to the energy storage destination selection device 100 according to the first embodiment (see FIG. 1), a heat dissipation proportionality constant update unit 117 is added to the control unit 110. The heat dissipation proportionality constant update unit 117 updates the heat dissipation proportionality constant based on the measured values ​​of the temperature of the heat storage device 360 ​​and the outside air temperature.

[0070] Second Embodiment: Heat Dissipation Proportional Constant Update Process 7 is a flowchart of the heat radiation proportionality constant updating process according to the second embodiment. The heat radiation proportionality constant updating process is executed, for example, periodically. In step S31, the heat radiation proportionality constant updating unit 117 acquires the heat storage material temperature TT0 of the heat storage device 360 ​​and the outside air temperature T0.

[0071] In step S32, the heat radiation proportionality constant updating unit 117 sets the time t to 0. In step S33, the heat radiation proportionality constant update unit 117 updates the processing unit period t STEP The process of repeating steps S34 to S36 is started each time the In step S34, the heat radiation proportionality constant update unit 117 updates the outside air temperature T t Get.

[0072] In step S35, the heat radiation proportionality constant update unit 117 calculates the ratio of the outside air temperature T0 acquired in step S31 to the outside air temperature T t If the difference is less than the predetermined threshold (step S34→YES), the process proceeds to step S36. If the difference is equal to or greater than the predetermined threshold (step S34→NO), the heat radiation proportionality constant update unit 117 stops repeating the process and proceeds to step S37.

[0073] In step S36, the heat radiation proportionality constant update unit 117 updates the processing unit period t STEP and return to step S34. In step S37, the heat radiation proportionality constant updating unit 117 updates the heat storage material temperature TT t Get.

[0074] In step S38, the heat radiation proportionality constant update unit 117 calculates the heat radiation proportionality constant k by the following formula, and updates the heat radiation proportionality constant database 130. k=-(ln((TT t -T0) / (TT0-T0))) / t

[0075] As described above, the energy storage destination selection device 100A includes the heat radiation proportional constant updating unit 117 that corrects the heat loss characteristics based on the heat loss per unit time at the outside air temperature.

[0076] <<Second embodiment: Features of the energy storage destination selection device>> The energy storage destination selection device 100A updates the heat dissipation proportionality constant based on the measured values ​​of the heat storage material temperature of the heat storage device 360 ​​and the outside air temperature. In this way, it is possible to obtain an accurate heat dissipation proportionality constant of the heat storage device 360 ​​and to calculate an accurate amount of usable energy. As a result, it is possible to accurately select a storage destination and efficiently use the energy generated by the energy generation device 310.

[0077] Third Embodiment The energy storage destination selection device 100 of the first embodiment calculates the thermal storage use end time based on the remaining energy amount in the thermal storage device 360. In the third embodiment, the energy storage use end time and the thermal storage use end time are calculated based on the remaining energy amounts in the power storage device 330 and the thermal storage device 360, respectively, and a storage destination is selected.

[0078] Third Embodiment: Configuration of Energy Storage Destination Selection Device 8 is a functional block diagram of an energy storage destination selection device 100B according to the third embodiment. Compared to the energy storage destination selection device 100 according to the first embodiment (see FIG. 1), a usage period calculation unit 113B of the control unit 110 is different. In addition to the thermal storage use end time, the usage period calculation unit 113B calculates the power storage use end time, which is the time when the energy load device 370 will finish using the energy stored in the power storage device 330. The calculation process is the same as the usage period calculation process for the thermal storage use end time (see FIG. 5), except that the remaining energy amount in step S22 shown in FIG. 5 is the remaining energy amount of the power storage device 330.

[0079] Third Embodiment: Energy Storage Destination Selection Process 9 is a flowchart of the energy storage destination selection process according to the third embodiment. The energy storage destination selection process is executed at a predetermined timing, for example, periodically.

[0080] In step S41, a process for calculating the usage period of the stored heat energy, which is the energy stored in the heat storage device 360, is executed. By this usage period calculation process, the start time of the energy storage destination selection process is set to time 0, and the end time of the stored heat usage T HEND is obtained. In step S42, a process for calculating the usage period of the stored energy, which is the energy stored in the power storage device 330, is executed. By this usage period calculation process, the start time of the energy storage destination selection process is set to time 0, and the storage energy usage end time T EEND is obtained.

[0081] In step S43, the available energy amount calculation unit 115 calculates the heat storage use end time T HEND ) The amount of usable energy E of the heat storage device 360 H (T HEND ) is calculated. In step S44, the available energy amount calculation unit 115 calculates the storage energy use end time (T EEND The amount of usable energy E of the power storage device 330 in E (T EEND ) is calculated.

[0082] In step S45, the storage destination selection unit 116 selects E H (T HEND ) is E E (T EEND ) (step S45→YES), proceed to step S46, and E (T EEND ) or less (step S45→NO), proceed to step S47. Steps S46 and S47 are similar to steps S15 and S16 (see FIG. 4), respectively.

[0083] As described above, the usage period calculation unit 113B calculates the heat storage usage end time and the electricity storage usage end time. The storage destination selection unit 116 compares the amount of available energy in the thermal storage device 360 ​​at the end time of the thermal storage use with the amount of available energy in the power storage device 330 at the end time of the power storage use, and selects the larger amount as the storage destination.

[0084] <<Third embodiment: Features of the energy storage destination selection device>> The energy storage destination selection device 100B calculates both the thermal storage use end time and the power storage use end time, and calculates the amount of available energy for each of the power storage device 330 and the thermal storage device 360 ​​to select a storage destination. Compared to calculating the amount of available energy for the power storage device 330 and the thermal storage device 360 ​​based only on the thermal storage use end time, the energy storage destination selection device 100B can calculate the amount of available energy more accurately. This allows the energy storage destination selection device 100B to efficiently use the energy generated by the energy generation device 310.

[0085] Fourth Embodiment In the first embodiment, all of the energy generated by the energy generation device 310 is stored in the power storage device 330 or the heat storage device 360. In the fourth embodiment, the surplus of the generated energy that is not used by the energy load device 370 (surplus power) is stored.

[0086] Fourth Embodiment: Configuration of Energy Storage Destination Selection Device 10 is a functional block diagram of an energy storage destination selection device 100C according to the fourth embodiment. Compared to the energy storage destination selection device 100 according to the first embodiment (see FIG. 1), the control unit 110 is provided with a storage determination unit 118. The storage determination unit 118 determines whether or not there is surplus power, that is, the amount of energy generated by the energy generation device 310 exceeds the amount of energy demanded by the energy load device 370.

[0087] <Fourth embodiment: Energy storage destination selection process> 11 is a flowchart of the energy storage destination selection process according to the fourth embodiment. The energy storage destination selection process is executed at a predetermined timing, for example, periodically.

[0088] In step S51, the storage determination unit 118 acquires the amount of power generated by the energy generation device 310 at the current time. For example, the storage determination unit 118 inquires of the energy generation device 310 about the amount of power generated. The storage determination unit 118 also acquires the amount of energy used by the energy load device 370. For example, the storage determination unit 118 inquires of the energy load device 370 about the amount of energy used.

[0089] In step S52, if the amount of power generated by the energy generation device 310 exceeds the amount of demand of the energy load device 370 (step S52 → YES), the storage determination unit 118 proceeds to step S53. If the amount of power generated is equal to or less than the amount of demand (step S52 → NO), the energy storage destination selection process ends.

[0090] Steps S53 to S58 are the same processes as steps S11 to S16 shown in Fig. 4. However, the demand P(t) of the energy load device 370 at time t in the process of calculating the usage period of thermal storage energy in step S53 (see Fig. 5) is interpreted as follows: When the amount of power generation is greater than the amount of demand at time t, P(t) is 0, and when the amount of power generation is less than the amount of demand at time t, P(t) is the demand at time t minus the amount of power generation. Note that the amount of power generation may be the amount of power generation acquired in step S51, or may be the amount of power generation at time t predicted by the power generation amount prediction unit 111.

[0091] In steps S54 and S55, the amount of usable energy is calculated using the generated power E RE is interpreted as surplus power (generated power - demand of energy load device 370). Furthermore, in steps S57 and S58, the path switching devices 320 and 350 send energy equivalent to the demand of the energy load device 370 to the energy load device 370, and send energy equivalent to the surplus power to the power storage device 330 or the heat storage device 360.

[0092] As described above, the energy storage destination selection device 100C includes a storage determination unit 118 that, when the amount of energy generated by the energy generation device 310 is greater than the demand of the energy load device 370, determines to store the surplus energy obtained by subtracting the demand of the energy load device 370 from the amount of energy generated by the energy generation device 310 in the heat storage device 360 ​​or the power storage device 330.

[0093] The usable energy amount calculation unit 115 provided in the energy storage destination selection device 100C calculates the amount of usable energy at the end of use when the energy equivalent to the surplus power is stored in the heat storage device 360, and the amount of usable energy at the end of use when the energy equivalent to the surplus power is stored in the power storage device 330. When the storage determination unit 118 determines that storage is to be performed, the storage destination selection unit 116 provided in the energy storage destination selection device 100C compares the available energy amounts of the power storage device 330 and the heat storage device 360 ​​at the time of end of use and selects the larger one as the storage destination for the excess power energy.

[0094] <Fourth embodiment: Features of the energy storage destination selection device> The energy storage destination selection device 100C stores surplus power when the amount of power generation exceeds the amount of demand, and thus the energy generated by the energy generation device 310 can be used more efficiently.

[0095] Fifth Embodiment In the fourth embodiment, the surplus of the generated energy that is not used by the energy load device 370 is stored. In the fifth embodiment, the surplus is sold.

[0096] Fifth Embodiment: Configuration of Power Management System 12 is an overall configuration diagram of a power management system 10D according to the fifth embodiment. A path switching device 320D can transmit a portion of the power generated by the energy generation device 310 to a power grid 380. Compared to the energy storage destination selection device 100 according to the first embodiment (see FIG. 1), the energy storage destination selection device 100D differs in that it has a storage determination unit 118D. When the amount of usable energy is smaller than a predetermined threshold, the storage determination unit 118D selects to sell the surplus power and instructs the path switching device 320 to transmit the generated power equivalent to the surplus power to the power grid 380.

[0097] Fifth Embodiment: Energy Storage Destination Selection Process 13 is a flowchart of the energy storage destination selection process according to the fifth embodiment. The energy storage destination selection process is executed at a predetermined timing, for example, periodically. Except for steps S66 and S67, steps S61 to S70 are the same processes as steps S51 to S58 shown in FIG. 11, respectively.

[0098] In step S66, if the amount of usable energy of the power storage device 330 and the heat storage device 360 ​​is less than a predetermined threshold (step S66→YES), the storage determination unit 118D proceeds to step S67. If the amount of usable energy of either the power storage device 330 or the heat storage device 360 ​​is equal to or greater than a predetermined threshold (step S66→NO), the storage determination unit 118D proceeds to step S68. The predetermined threshold is, for example, the product of (power selling price / power purchasing price) and surplus power. In step S67, the storage determination unit 118D determines that the surplus power generated by the energy generation device 310 is to be sold, and instructs the path switching device 320 to transmit the surplus power to the power grid 380.

[0099] As described above, the storage determination unit 118D provided in the energy storage destination selection device 100D determines to sell the surplus power energy instead of storing it in the power storage device 330 or the heat storage device 360 ​​when the amount of energy generated by the energy generation device 310 is greater than the demand of the energy load device 370 and the amount of usable energy of the heat storage device 360 ​​and the power storage device 330 at the end of use is less than a predetermined value.

[0100] <Fifth embodiment: Features of the energy storage destination selection device> The energy storage destination selection device 100D stores surplus power (when the amount of power generation exceeds the amount of demand) in addition to storing it in electricity / heat, thereby enabling the energy generated by the energy generation device 310 to be used efficiently, including in terms of cost.

[0101] Sixth Embodiment In the embodiments described above, the energy generated by the energy generation device 310 is stored as electricity / heat. In the sixth embodiment, instead of the energy generation device 310, electricity from the power grid is stored as electricity / heat during times when the cost of purchasing electricity is low, and is used during times when the cost of purchasing electricity is high.

[0102] Sixth Embodiment: Configuration of Power Management System 14 is an overall configuration diagram of a power management system 10E according to the sixth embodiment. A power grid 380 is connected to the path switching device 320 instead of the energy generation device 310. Compared to the energy storage destination selection device 100 according to the first embodiment (see FIG. 1), the energy storage destination selection device 100E differs in a storage determination unit 118E. If the purchased power from the power grid 380 is low-cost power, the storage determination unit 118E stores the power from the power grid 380 in electricity / heat.

[0103] Sixth Embodiment: Energy Storage Destination Selection Process 15 is a flowchart of the energy storage destination selection process according to the sixth embodiment. The energy storage destination selection process is executed at a predetermined timing, for example, periodically.

[0104] In step S81, if the power purchased from the power grid 380 at the current time is low-cost power (step S81→YES), the storage determination unit 118E proceeds to step S82, and if it is not low-cost power (step S81→NO), the storage determination unit 118E ends the energy storage destination selection process. Low-cost power is power whose power purchase cost is lower than a predetermined value. The predetermined value is, for example, the average power purchase cost during the operating hours of the energy load device 370. The average may be a weighted average according to the demand amount of the energy load device 370.

[0105] Steps S82 to S87 are the same processes as steps S11 to S16 shown in Fig. 4. However, the demand amount P(t) of the energy load device 370 at time t in the process of calculating the usage period of thermal storage energy in step S82 (see Fig. 5) is interpreted as follows: When the power of the power grid 380 at time t is low-cost power, P(t) is 0, and when it is not low-cost power, P(t) is the demand amount of the energy load device 370 at time t. Furthermore, when calculating the amount of available energy, the generated power E of the energy generation device 310 is RE is read as the electricity purchased from the power grid 380.

[0106] As described above, the energy storage destination selection device 100E includes the storage determination unit 118E that determines to store the electric energy supplied from the power grid 380 in the heat storage device 360 ​​or the electric storage device 330 during a time period when the power purchase cost is lower than a predetermined value. The available energy amount calculation unit 115 provided in the energy storage destination selection device 100E calculates the available energy amount at the end of use time when the electric energy is stored in the heat storage device 360, and the available energy amount at the end of use time when the electric energy is stored in the power storage device 330. When the storage determination unit 118E determines that storage is to be performed, the storage destination selection unit 116 included in the energy storage destination selection device 100E compares the available energy amounts of the power storage device 330 and the heat storage device 360 ​​at the time of end of use and selects the larger one as the storage destination for the electric energy.

[0107] <<Sixth embodiment: Features of the energy storage destination selection device>> Even if the power source is not the energy generating device 310 but the power of the low-cost power system 380, the energy storage destination selection device 100E can efficiently utilize the power.

[0108] <<Variation: End of Use Time>> The energy storage destination selection devices 100, 100A, 100C, 100D, and 100E calculate the time when the energy load device 370 finishes using / consuming the energy stored in the thermal storage device 360 ​​as the thermal storage use end time, and select a storage destination by comparing the amounts of energy available at this time in the power storage device 330 and the thermal storage device 360. Instead of the thermal storage use end time, the storage destination may be selected by comparing the amounts of energy available at the power storage use end time when the energy load device 370 finishes using / consuming the energy stored in the power storage device 330.

[0109] Other variations Although several embodiments of the present invention have been described above, these embodiments are merely illustrative and do not limit the technical scope of the present invention. For example, in the above-described embodiments, there is one power storage device 330 and one heat storage device 360, but there may be multiple of either one or both. The energy storage destination selection devices 100, 100A, 100B, 100C, 100D, and 100E may calculate the amount of usable energy for all power storage devices 330 and heat storage devices 360 and select the energy storage device with the largest amount of usable energy as the storage destination.

[0110] The present invention can take on various other embodiments, and various modifications such as omissions and substitutions can be made without departing from the spirit of the present invention. These embodiments and modifications are included in the scope and spirit of the invention described in this specification, etc., and are also included in the invention described in the claims and their equivalents.

[0111] <Hardware configuration> The energy storage destination selection devices 100, 100A, 100B, 100C, 100D, and 100E according to the above-described embodiments are realized by a computer 900 having a configuration as shown in FIG. 16, for example. FIG. 16 is a hardware configuration diagram showing an example of the computer 900 that realizes the functions of the energy storage destination selection devices 100, 100A, 100B, 100C, 100D, and 100E according to the above-described embodiments. The computer 900 includes a CPU 901, a ROM 902, a RAM 903, an SSD 904, an input / output interface 905 (referred to as an input / output I / F (Interface) in FIG. 16), a communication interface 906 (referred to as a communication I / F in FIG. 16), and a media interface 907 (referred to as a media I / F in FIG. 16). The computer 900 may include a hard disk drive (HDD) instead of the SSD 904, or may include a HDD in addition to the SSD 904.

[0112] The CPU 901 operates based on a program stored in the ROM 902 or the SSD 904, and performs control by the control unit 110 in Fig. 1. The ROM 902 stores a boot program executed by the CPU 901 when the computer 900 starts up, programs related to the hardware of the computer 900, and the like.

[0113] The CPU 901 controls an input device 910 such as a mouse or keyboard, and an output device 911 such as a display or printer, via an input / output interface 905. The CPU 901 acquires data from the input device 910 via the input / output interface 905, and outputs generated data to the output device 911.

[0114] The SSD 904 stores programs executed by the CPU 901 and data used by the programs. The communication interface 906 receives data from other devices (not shown) (e.g., the power storage device 330 and the heat storage device 360) via a communication network and outputs the data to the CPU 901, and also transmits data generated by the CPU 901 to other devices (e.g., the path switching devices 320 and 350) via the communication network.

[0115] The media interface 907 reads a program or data stored in the recording medium 912 and outputs it to the CPU 901 via the RAM 903. The CPU 901 loads the program from the recording medium 912 onto the RAM 903 via the media interface 907 and executes the loaded program. The recording medium 912 is an optical recording medium such as a DVD (Digital Versatile Disk), a magneto-optical recording medium such as an MO (Magneto Optical disk), a magnetic recording medium, a conductive memory tape medium, a semiconductor memory, or the like.

[0116] For example, when the computer 900 functions as the energy storage destination selection devices 100, 100A, 100B, 100C, 100D, and 100E according to the above-described embodiments, the CPU 901 of the computer 900 executes a program 128 (see FIG. 1 ) loaded onto the RAM 903 to realize the functions of the energy storage destination selection devices 100, 100A, 100B, 100C, 100D, and 100E. The CPU 901 reads the program from a recording medium 912 and executes it. Alternatively, the CPU 901 may read the program from another device via a communication network, or may install the program 128 from the recording medium 912 onto the SSD 904 and execute it. [Explanation of symbols]

[0117] 10, 10D, 10E Power Management System 100, 100A, 100B, 100C, 100D, 100E Energy storage destination selection device 111 Power Generation Forecasting Unit 112 Demand Forecasting Department 113,113B Usage period calculation part 114 Stored energy calculation unit 115 Available energy amount calculation unit 116 Storage destination selection unit 117 Heat radiation proportional constant update section 118, 118D, 118E Storage determination section 121 Usage Plan 122 Weather Information 130 Heat Dissipation Proportionality Constant Database 310 Energy Generator 320,350 Route switching device 330 Electricity storage device 340 Heat Pump 360 Heat storage device 370 Energy Loading Device 380 Power System

Claims

1. a usage period calculation unit that calculates a heat storage usage end time, which is the time when the energy load device finishes using the energy stored in the heat storage device, or a power storage usage end time, which is the time when the energy load device finishes using the energy stored in the power storage device, and sets the calculated time as the usage end time; a usable energy amount calculation unit that calculates the amount of usable energy at the end of use time when the energy generated by the energy generation device is stored in the heat storage device, and the amount of usable energy at the end of use time when the energy generated by the energy generation device is stored in the power storage device; a storage destination selection unit that compares the available energy amounts of the power storage device and the heat storage device at the end of use time and selects the larger one as a storage destination for the energy generated by the energy generation device. Energy storage destination selection device.

2. The available energy amount calculation unit Calculating the amount of usable energy of the heat storage device based on the heat loss characteristics of the heat storage device The energy storage destination selection device according to claim 1 .

3. A heat radiation proportional constant update unit corrects the heat loss characteristics based on the heat loss per unit time at the outside air temperature. The energy storage destination selection device according to claim 2 .

4. The available energy amount calculation unit Calculating the amount of usable energy of the power storage device based on the self-discharge rate of the power storage device The energy storage destination selection device according to claim 1 .

5. The usage period calculation unit The energy demand amount of the energy load device for each predetermined period is integrated, and the integrated amount is compared with the amount of energy stored in the power storage device or the heat storage device, thereby calculating the end time of use. The energy storage destination selection device according to claim 1 .

6. The usage period calculation unit Calculating the end time of the heat storage use and the end time of the electricity storage use; The storage destination selection unit The amount of energy available in the heat storage device at the end time of the heat storage use is compared with the amount of energy available in the power storage device at the end time of the power storage use, and the larger amount of energy available in the power storage device is selected as the storage destination. The energy storage destination selection device according to claim 1 .

7. a storage determination unit that, when an amount of energy generated by the energy generation device is greater than an amount of demand by the energy load device, determines to store surplus energy obtained by subtracting the amount of demand by the energy load device from the amount of energy generated by the energy generation device in the heat storage device or the power storage device; The available energy amount calculation unit calculating an amount of usable energy at the end of use time when the energy equivalent to the surplus power is stored in the heat storage device, and an amount of usable energy at the end of use time when the energy equivalent to the surplus power is stored in the power storage device; The storage destination selection unit When the storage determination unit determines to store the excess power, the amount of usable energy of the power storage device and the amount of usable energy of the heat storage device at the end of use time are compared, and the larger of the two is selected as a storage destination for the excess power energy. The energy storage destination selection device according to claim 1 .

8. The storage determination unit The amount of energy generated by the energy generating device is greater than the amount of energy demanded by the energy loading device, and When the amount of usable energy of the heat storage device and the power storage device at the end of use time is smaller than a predetermined value, determining whether to sell the excess power energy instead of storing it in the power storage device or the heat storage device; The energy storage destination selection device according to claim 7.

9. a storage determination unit that determines to store electric energy supplied from the electric power grid in the heat storage device or the electric storage device during a time period when the electric power purchase cost is lower than a predetermined value; The available energy amount calculation unit calculating an amount of usable energy at the end of use time when the electric energy is stored in the heat storage device, and an amount of usable energy at the end of use time when the electric energy is stored in the power storage device; The storage destination selection unit When the storage determination unit determines to store the electric energy, the amount of available energy of the electric storage device and the amount of available energy of the heat storage device at the end of use time are compared, and the larger one is selected as the storage destination of the electric energy. The energy storage destination selection device according to claim 1 .

10. The energy storage destination selection device a step of calculating a heat storage use end time, which is the time when the energy load device finishes using the energy stored in the heat storage device, or a power storage use end time, which is the time when the energy load device finishes using the energy stored in the power storage device, and setting the calculated time as the use end time; calculating an amount of usable energy at the end of use time when the energy generated by the energy generation device is stored in the heat storage device, and an amount of usable energy at the end of use time when the energy generated by the energy generation device is stored in the power storage device; comparing the available energy amounts of the power storage device and the heat storage device at the end of use time and selecting the larger one as a storage destination for the energy generated by the energy generation device. Energy storage destination selection method.

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