Power control system and power control device

Abstract

To provide a power control system and a power control apparatus that are capable of implementing self consignment of generated power.SOLUTION: A power control system comprises: a power generation unit for generating power at a first site; a power adjustment unit for performing at least one of power charging and discharging at the first site; and a control unit for controlling the power generation by the power generation unit and controlling the at least one of power charging and discharging by the power adjustment unit. For each predetermined time section, the control unit performs control so that an achievement of electric energy inversely flowing from the first site to a power system is made to be larger than a planned value in a first time period and performs control so that an achievement of electric energy inversely flowing from the first site to the power system is made to be smaller than the planned value in a second time period after the first time period.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a power control system and a power control device.

Background Art

[0002] Conventionally, self-delivery is known as a mechanism for transmitting power from a power generation facility to a demand facility via a power grid managed by a third-party entity. In a system that performs self-delivery, a technique for appropriately grasping the self-delivered power has been proposed (see, for example, Patent Document 1).

[0003] When performing photovoltaic power generation, for example, when the power generation amount is large or during a period when the power demand is low, it is necessary to suppress the power generation output so that the power supplied to the power grid does not exceed the connectable amount of the electric utility (output control). In addition, when photovoltaic power generation is added during a period when the power demand is high, output control may be required to prevent the power line from overheating. When a command regarding power (power command) is issued by the electric utility, it is required to perform output control of the power so as to satisfy the power command in the power generation facility. In output control, a technique has been proposed for calculating the value of the power command based on the command value of the output control and the abnormality detection result and transmitting it to the power conditioner (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the system as described above, it is desired to suitably realize self-delivery of the generated power.

[0006] An object of the present disclosure is to provide a power control system and a power control device capable of realizing self-feed of generated power.

Means for Solving the Problems

[0007] A power control system according to an embodiment includes: a power generation unit that generates power at a first site; a power conditioner that performs at least one of charging and discharging power at the first site; a control unit that controls power generation by the power generation unit and controls at least one of charging and discharging power by the power conditioner. The control unit controls so that the actual amount of reverse power flow from the first site to the power grid at a first time period within each predetermined time period is and controls so that the actual amount of reverse power flow from the first site to the power grid at a second time period after the first time period is Value is Exceed the planned value and controls so that the actual amount of reverse power flow from the first site to the power grid at a second time period after the first time period is Value is Do not exceed the planned value as follows.

[0008] Also, a power control device according to an embodiment controls power generation by a power generation unit at a first site and controls at least one of charging and discharging power by a power conditioner at the first site. The power control device controls so that the actual amount of reverse power flow from the first site to the power grid at a first time period within each predetermined time period is The power control device controls so that the actual amount of reverse power flow from the first site to the power grid at a first time period within each predetermined time period is Value is Exceed the planned value and controls so that the actual amount of reverse power flow from the first site to the power grid at a second time period after the first time period is Value is Do not exceed the planned value as follows.

Advantages of the Invention

[0009] According to one embodiment, it is possible to provide a power control system and a power control device capable of realizing self-feed of generated power.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0011] In the present disclosure, the power control system and / or the power control device may be a system and / or a device that operates by electric power. Further, the power control system and / or the power control device may include a function of controlling electric power. The function of the power control system and / or the power control device is not limited to the function of controlling electric power, and may have other functions.

[0012] In the present disclosure, "self-delivery" may be defined as, for example, that stipulated in the "Guidelines on Self-Delivery" (implemented on April 1, 2014, amended on November 18, 2021) formulated by the Agency for Natural Resources and Energy, an external bureau of the Ministry of Economy, Trade and Industry. That is, self-delivery may refer to the power transmission service provided by a general electric utility when a person installing a private power generation facility transmits the power generated using the private power generation facility to a factory or the like at another location of the person installing the private power generation facility via the power transmission and distribution network maintained and operated by the general electric utility. Further, as recently amended, self-delivery may also refer to an expanded scope of application that allows not only self-delivery but also delivery to others in a closely related relationship when combined with others.

[0013] Hereinafter, a power control system according to an embodiment will be described with reference to the drawings.

[0014] FIG. 1 is a diagram showing a configuration example of a power control system according to an embodiment. As shown in FIG. 1, in one embodiment, the power control system 1A may be a system installed at the first base, and the power control system 1B may be a system installed at the second base. Hereinafter, when the power control system 1A and the power control system 1B are not particularly distinguished, they are simply collectively referred to as the "power control system 1".

[0015] In FIG. 1, the first base is a base schematically shown in the area above the dashed-dotted line shown on the upper side of FIG. 1, and the second base is a base schematically shown in the area below the dashed-dotted line shown on the lower side of FIG. 1. The first base and / or the second base may be any location where power generation and / or consumption is assumed, such as a location for so-called off-grid solar power generation, the offices or business premises of each operator, factories, and apartment houses. Further, in FIG. 1, the area between the first base and the second base may be, for example, another base other than the first base or the second base, a part of the first base and / or the second base, or any base.

[0016] In FIG. 1, the path during power transmission and / or reception, that is, the power path, is mainly indicated by solid lines. On the other hand, in FIG. 1, the path during information transmission and / or reception, that is, the electrical signal path, is mainly indicated by dashed lines.

[0017] Also, the functional units shown in FIG. 1 may be connected to each other by at least one of wired and wireless means as appropriate. In FIG. 1, communication interfaces and various repeaters (relay devices) for connecting between the functional units by at least one of wired and wireless means are omitted from the illustration. Further, each functional unit may appropriately include a storage unit such as a semiconductor memory for storing various information and / or programs. In FIG. 1, the storage unit such as a semiconductor memory is omitted from the illustration.

[0018] As shown in FIG. 1, the power control system 1A at the first site may be configured to include a power generation unit 10A, a power adjustment unit 20A, a load 30A, a smart meter 40A, a demand calculation unit 50A, a simultaneous same amount calculation unit 60A, and an output control unit 70A. The power control system 1A may not include some of the aforementioned functional units, or may include other functional units other than the aforementioned functional units.

[0019] Also, as shown in FIG. 1, the power control system 1B at the second site may be configured to include a power generation unit 10B, a power adjustment unit 20B, a load 30B, a smart meter 40B, a demand calculation unit 50B, a simultaneous same amount calculation unit 60B, and an output control unit 70B. The power control system 1B may not include some of the aforementioned functional units, or may include other functional units other than the aforementioned functional units.

[0020] Hereinafter, when the power generation unit 10A and the power generation unit 10B are not particularly distinguished, they are simply referred to as "power generation unit 10". Similarly, for other functional units, when the functional units of the power control system 1A and the functional units of the power control system 1B are not particularly distinguished, only the reference number of the functional unit is noted (that is, symbols such as A or B are omitted). For example, when the power adjustment unit 20A and the power adjustment unit 20B are not particularly distinguished, they are simply referred to as "power adjustment unit 20".

[0021] Each functional unit of the power control system 1B corresponding to the functional unit of the power control system 1A may have the same configuration or a similar configuration as the functional unit of the power control system 1A, or may have a different configuration. Hereinafter, for the sake of simplifying the description, each functional unit of the power control system 1B corresponding to the functional unit of the power control system 1A will be described as being the same as the functional unit of the power control system 1A.

[0022] Hereinafter, unless otherwise specified, basically, the power control system 1A will be described in more detail. However, for the power control system 1B as well, descriptions based on the same or similar gist as the power control system 1A may be applicable.

[0023] The power generation unit 10 may be a functional unit that generates power such as solar power generation by including, for example, a solar cell. The power generation unit 10 may be capable of outputting the generated power to the outside. The power generation unit 10 may appropriately include a power conditioner (hereinafter, also referred to as PCS (Power Conditioning Subsystem)) that controls the power generated by the power generation unit 10 and output to the outside. Hereinafter, the power generation unit 10 will be described as performing solar power generation. However, in one embodiment, the power generation performed by the power generation unit 10 is not limited to solar power generation. For example, the power generation unit 10 may perform wind power generation, hydropower generation, thermal power generation, power generation by a fuel cell, or power generation by a plug-in hybrid vehicle. In one embodiment, the power generation unit 10 may generate power that can flow reversely into the power grid. The power generation unit 10 can be configured by various known technologies. Therefore, a more detailed description of the power generation unit 10 will be omitted.

[0024] The electric power generated by the power generation unit 10 may be supplied to the smart meter 40 (via the PCS provided in the power generation unit 10). For this reason, as shown in FIG. 1, the power generation unit 10 may be connected to the smart meter 40 by a power line. The electric power supplied from the power generation unit 10 to the smart meter 40 may be power flowing in reverse to the power grid. Also, the power flowing in reverse in this way may be used as self-consumption power. Further, the electric power supplied from the power generation unit 10 to the smart meter 40 may be purchased as surplus imbalance power by the power grid. The power generation unit 10 may control the power output based on the output control value (e.g., %) transmitted from the output control unit 70. Also, information on the electric power generated by the power generation unit 10 (such as the amount of electric power output) may be transmitted to the demand calculation unit 50.

[0025] The power conditioner 20A may function to adjust the power at the first base. Also, the power conditioner 20B may function to adjust the power at the second base. The power conditioner 20 may include at least one of a function to enable external power output and a function to enable external power input. Specifically, the power conditioner 20 may include, for example, a storage battery. The power conditioner 20 may appropriately include a PCS or the like that controls at least one of the power output by the power conditioner 20 and the power input to the power conditioner 20. That is, in this case, the PCS of the power conditioner 20 may control at least one of the power discharged by the storage battery of the power conditioner 20 and the power charged to the storage battery. By the power charged and discharged by the power conditioner 20, the power control system 1 can obtain an adjustment force for achieving the same amount of the planned value described later at the same time.

[0026] The power conditioner 20 may include, for example, a stationary storage battery, or may include a storage battery (battery) of an electric vehicle such as an EV or a plug-in hybrid vehicle. The power conditioner 20 can be configured by various known technologies. Therefore, a more detailed description of the power conditioner 20 is omitted.

[0027] The power discharged by the power conditioner 20 may be supplied to the smart meter 40 (via the PCS included in the power conditioner 20). Also, the power conditioner 20 may charge at least a part of the power supplied from the power generation unit 10 (via the PCS included in the power conditioner 20). For this reason, as shown in FIG. 1, the power conditioner 20 may be connected to the smart meter 40 by a power line. The power conditioner 20 may control the power to be charged and discharged based on an adjustment value (e.g., %) transmitted from the output control unit 70. Also, the power conditioner 20 may be controlled so as not to be able to charge the power supplied from the power grid.

[0028] The load 30A may be various devices that consume power at the first base. Also, the load 30B may be various devices that consume power at the second base. The load 30 may be composed of any electronic device.

[0029] The load 30 may consume at least a part of the power generated by the power generation unit 10. Also, the load 30 may consume at least a part of the power discharged by the power conditioner 20. Also, the load 30 may consume at least a part of the power purchased from the grid power. As shown in FIG. 1, the load 30 may be connected to the power generation unit 10, the power conditioner 20, and the smart meter 40 by a power line.

[0030] The smart meter 40 may be a functional unit having a function of digitally measuring power information and communicating the measured information. Here, the power information may be, for example, information such as the amount of power purchased, the amount of reverse power flow, and / or the time related to power. As shown in FIG. 1, the smart meter 40 may be connected to the power generation unit 10, the power conditioner 20, and the load 30 by a power line. The smart meter 40 can be configured by various known technologies. Therefore, a more detailed description of the smart meter 40 is omitted.

[0031] As shown in FIG. 1, the smart meter 40A at the first base and the smart meter 40B at the second base may be connected by a power line (power system). In this way, by connecting the smart meters 40 to each other by a power line, self-power transmission can be performed from one base to the other base. In FIG. 1, the power generated by the power generation unit 10A at the first base may be self-transmitted to the load 30B at the second base. Also, in FIG. 1, the power generated by the power generation unit 10B at the second base may be self-transmitted to the load 30A at the first base. When realizing such bidirectional self-power transmission, a functional unit for determining the direction of self-power transmission (hereinafter referred to as the "determination unit") may be provided. Such a determination unit may be provided at the first base as part of the power control system 1A, may be provided at the second base as part of the power control system 1B, or may be provided at a location different from the first base or the second base.

[0032] The smart meter 40A may be communicably connected to the demand calculation unit 50 and the output control unit 70. The smart meter 40A may transmit information (for example, the amount of power) of the power purchased and / or flowing in reverse at the first base to the demand calculation unit 50. Also, the smart meter 40 may transmit information (for example, the amount of power) of the power flowing in reverse among the power generated by the power generation unit 10 to the output control unit 70. Also, the smart meter 40 may transmit information (for example, the amount of power) of the power flowing in reverse among the power generated by the power generation unit 10 to the output control unit 70. Here, at least a part of the power flowing in reverse among the power generated by the power generation unit 10 may be used as the power for self-power transmission.

[0033] The demand calculation unit 50, the simultaneous and equal amount calculation unit 60, and the output control unit 70 may each be a controller that controls the operation of the power control system 1. In order to provide control and processing capabilities for executing various functions, this controller may include at least one processor such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). The controller may be realized by one processor or by a plurality of processors. The controller may be realized as a single integrated circuit. The processor may be realized as a plurality of integrated circuits and discrete circuits that are communicably connected. The controller may be configured as a CPU or a DSP and software such as a program executed by the CPU or the DSP. Programs executed in the controller and results of processes executed in the controller may each be stored in an arbitrary storage unit.

[0034] The demand calculation unit 50, the simultaneous and equal amount calculation unit 60, and the output control unit 70 may each be separate functional units, or may be functional units in which at least a part is merged, or may be functional units in which all are merged. The demand calculation unit 50, the simultaneous and equal amount calculation unit 60, and the output control unit 70 may each be configured as hardware resources, or may be configured as software, or may be constructed by the cooperation of software and hardware resources. The respective functions of the demand calculation unit 50, the simultaneous and equal amount calculation unit 60, and the output control unit 70 will be further described later.

[0035] The power server 200 may be a server that distributes various information of an electric utility such as an electric power company. In one embodiment, the power server 200 may transmit a command related to electric power (power command) to each site such as the first site and / or the second site. Here, the power command may be a command that requests control (such as suppression) of the output of electric power by power generation when the balance between the demand and supply of electric power cannot be achieved in the power system. Hereinafter, a command that requests such suppression of electric power is also referred to as "output suppression". Further, the above-described power command may be acquired from the power server 200 by an arbitrary device in the power control system 1, for example. The power server 200 may transmit a power command to, for example, the simultaneous same amount calculation unit 60 and / or the output control unit 70 of the power control system 1. Further, the power server 200 may transmit a power command to the simultaneous same amount calculation unit 60 via the output control unit 70, for example. Further, the simultaneous same amount calculation unit 60 and / or the output control unit 70 of the power control system 1 may acquire a power command from the power server 200. Therefore, the power server 200 may be communicably connected to the simultaneous same amount calculation unit 60 and / or the output control unit 70 of the power control system 1, etc.

[0036] In one embodiment, the power server 200 may transmit a power command including a value of the suppression amount (for example, %) of power generation to the simultaneous same amount calculation unit 60 and / or the output control unit 70, etc. Further, in one embodiment, the power server 200 may transmit the power command for a predetermined day by the day before the predetermined day or on the day of the predetermined day.

[0037] The power server 200 may be a server (computer) used in a normal client-server system, for example. The computer used as the server can be configured by various known technologies. Therefore, a more detailed description of the computer used as the server is omitted.

[0038] The wide-area institution server 300 may be an electronic device such as a server (computer) operated and / or used by an institution such as the Organization for Cross-regional Coordination of Transmission Operators, JAPAN: OCCTO. The Organization for Cross-regional Coordination of Transmission Operators is an organization established for the purpose of promoting the wide-area operation of the electricity business in Japan based on the Electricity Business Act (Law No. 170 of July 11, 1964). All electricity providers in Japan are obliged to become members of the organization. This organization monitors the electricity supply and demand situation of each member company and instructs other members to supply electricity to members with a deteriorating supply and demand situation. The wide-area institution server 300 may be a server (computer) used in a normal client-server system, for example.

[0039] In one embodiment, for example, the power control system at each site such as the power control system 1A at the first site and / or the power control system 1B at the second site may formulate (generate) the power generation plan for each site and transmit the power generation plan to the wide-area institution server 300. Here, the "power generation plan" may be, for example, the planned value of the amount of electricity for each predetermined time period for transmitting electricity from a power generation facility (e.g., the first site) to a demand facility (e.g., the second site). For example, in one embodiment, the simultaneous same-amount calculation unit 60 of the power control system 1 may be communicably connected to the wide-area institution server 300. In one embodiment, the simultaneous same-amount calculation unit 60 of the power control system 1 may transmit the formulated power generation plan of the power control system 1 to the wide-area institution server 300. In this specification, the "planned value of the amount of electricity" for each predetermined time period based on the power generation plan for a predetermined day is also referred to as the "planned amount of electricity". For example, in one embodiment, the simultaneous same-amount calculation unit 60 of the power control system 1 may transmit the power generation plan for a predetermined day of the power control system 1 to the wide-area institution server 300 by the day before the predetermined day (e.g., until noon on the day before the predetermined day).

[0040] The weather server 400 may be a server that distributes various weather information (weather data) and the like. The weather server 400 may be a server operated by an administrative agency such as the Japan Meteorological Agency, or may be a server operated by a private information provider or the like. In one embodiment, the weather server 400 may distribute various weather information (weather data) to the power control systems at each site, such as the power control system 1A at the first site and / or the power control system 1B at the second site. Further, the various weather information (weather data) may be acquired from the weather server 400 by any device in the power control system 1, for example. The various weather information (weather data) may include at least any one of, for example, the weather, temperature, humidity, sunshine duration, solar radiation amount, cloud amount, precipitation amount, and / or snow accumulation amount at a predetermined point at a predetermined time or a predetermined time period.

[0041] In one embodiment, the demand calculation unit 50 and the simultaneous same amount calculation unit 60 of the power control system 1 may be communicably connected to the weather server 400. In one embodiment, the weather server 400 may transmit various weather information to the demand calculation unit 50 and / or the simultaneous same amount calculation unit 60 of the power control system 1. The weather server 400 may be a server (computer) used in a normal client-server system, for example.

[0042] In one embodiment, the weather server 400 may not only distribute actual various weather data, but may also distribute, for example, predictions of various weather data. Further, in one embodiment, the weather server 400 may distribute various predictions as predictions of various weather data, such as prediction data for the current day and prediction data after a predetermined time such as predictions for the future.

[0043] Next, each of the demand calculation unit 50, the simultaneous same amount calculation unit 60, and the output control unit 70 in the power control system 1 according to one embodiment will be described in more detail.

[0044] The demand calculation unit 50 calculates the power demand in the power control system 1. In one embodiment, the demand calculation unit 50A calculates the power demand in the power control system 1A, for example, the power demand for supplying the load 30A. In one embodiment, the demand calculation unit 50 may calculate not only the actual power demand (the actual value of the power demand) in the power control system 1 but also the predicted value of the power in the power control system 1.

[0045] In one embodiment, the demand calculation unit 50 may calculate the actual value of the power demand based on the information transmitted from the power generation unit 10, the information transmitted from the power adjustment unit 20, and the information transmitted from the smart meter 40. In this case, the information transmitted from the power generation unit 10 may be data such as the amount of power actually output by the power generation of the power generation unit 10. The information transmitted from the power generation unit 10 may be, for example, the information transmitted from the PCS of the power generation unit 10. Also, the information transmitted from the power adjustment unit 20 may be data such as the amount of power actually charged and discharged by the charge and discharge of the power adjustment unit 20. The information transmitted from the power adjustment unit 20 may be, for example, the information transmitted from the PCS of the power adjustment unit 20. Also, the information transmitted from the smart meter 40 may be data on the power actually flowing in reverse and / or purchased electricity in the power control system 1 at each site.

[0046] In one embodiment, the demand calculation unit 50 may calculate the actual value of the power demand based on, for example, the following formula (1). (Power demand) = (Output power of the power generation unit 10) + (Charge and discharge power of the power adjustment unit 20) - (Sold electricity power) + (Purchased electricity power) (1) In formula (1), the charge and discharge power of the power adjustment unit 20 is positive for discharge and negative for charge. The actual value of the power demand calculated in this way may be stored in an arbitrary storage unit such as a storage unit provided in the demand calculation unit 50.

[0047] Further, in one embodiment, the demand calculation unit 50 may receive weather data such as, for example, temperature and / or humidity from the weather server 400 as described above. Further, the demand calculation unit 50 may store the weather data received from, for example, the weather server 400 in an arbitrary storage unit such as a storage unit included in the demand calculation unit 50.

[0048] In one embodiment, the demand calculation unit 50 may calculate a predicted value of power demand based on, for example, the above-described weather data. In this case, the demand calculation unit 50 may calculate the predicted value of power demand by, for example, modeling the relationship between the past actual values of power demand stored in the storage unit and the weather data, and performing multiple regression analysis or the like. Further, in one embodiment, the demand calculation unit 50 may calculate various predictions of power demand, such as predicted data after a predetermined time such as a prediction for the next day or a prediction after several hours, and predicted data for the current day, as the predicted value of power demand. The predicted value of power demand calculated by the demand calculation unit 50 in this way may be supplied to the simultaneous same amount calculation unit 60.

[0049] Thus, in one embodiment, the demand calculation unit 50A may calculate the power demand of the first base.

[0050] The simultaneous same amount calculation unit 60 generates a power generation plan that satisfies the simultaneous same amount. Here, the simultaneous same amount may be such that, on the premise that the demand for power (power purchase) at the self-delivery destination is greater than the reverse power flow of the power from the self-delivery source, the power generation plan and the actual performance of the reverse power flow are the same amount at the same time point. In one embodiment, the simultaneous same amount calculation unit 60 may calculate a predicted value of the reverse power flow based on the predicted value of the power demand supplied from the demand calculation unit 50.

[0051] As described above, the simultaneous same amount calculation unit 60 may receive the predicted value of the power demand from the demand calculation unit 50. The simultaneous same amount calculation unit 60 may receive various predictions of power demand, such as predicted data before a predetermined time such as a prediction issued the previous day or a prediction issued several hours ago, and predicted data for the current day, as the predicted value of the power demand.

[0052] In addition, the simultaneous same - amount calculation unit 60 may receive meteorological data including, for example, solar radiation amount from the meteorological server 400. In particular, the simultaneous same - amount calculation unit 60 may receive predictions of various meteorological data from the meteorological server 400. As described above, the simultaneous same - amount calculation unit 60 may receive various predictions from the meteorological server 400, such as prediction data before a predetermined time, such as a prediction made the previous day or a prediction made several hours ago, prediction data for the current day, and prediction data after a predetermined time, such as a prediction for the future.

[0053] In one embodiment, the simultaneous same - amount calculation unit 60 may calculate a prediction of the power generation amount by the power generation unit 10 based on meteorological data received from the meteorological server 400 and the like. In this case, the simultaneous same - amount calculation unit 60 may calculate a prediction of the power generation amount by the power generation unit 10 based on, for example, the following formula (2). (Power generation amount of the power generation unit 10)=(Solar radiation amount)×(Coefficient) (2) Here, in the "Method for estimating the generated electric power of a photovoltaic power generation system" (JIS C8907:2005) according to the Japanese Industrial Standards (JIS), a formula for estimating the electric power generated by a photovoltaic power generation system from various parameters is defined. In one embodiment, that formula may be used. Since these are defined in JIS C8907:2005, a more detailed description is omitted.

[0054] Also, in one embodiment, the simultaneous same - amount calculation unit 60 may calculate, for example, the reverse power flow at the base where the power control system 1 is installed based on the following formula (3). Here, reverse power flow occurs when the power generated is greater than the power demanded. Therefore, calculating the reverse power flow based on formula (3) may be, for example, when the power generated is greater than the demanded power. (Reverse power flow)=(Power generation of the power generation unit 10)-(Power demand) (3) Based on this calculation result, the simultaneous and equal amount calculation unit 60 may generate it as a power generation plan at that site. For example, this calculation result may be directly generated as a power generation plan, or a value obtained by multiplying a coefficient in this calculation result may be generated as a power generation plan. In one embodiment, the simultaneous and equal amount calculation unit 60 may transmit the power generation plan of the reverse power flow generated in this way to, for example, the output control unit 70 and / or the wide-area institution server 300. In one embodiment, the simultaneous and equal amount calculation unit 60 may transmit, as the generated power generation plan of the reverse power flow, for example, power generation a predetermined time ago such as the power generation plan of the previous day or the power generation plan a few hours ago, and the power generation plan of the current day, etc. to the output control unit 70.

[0055] Furthermore, in one embodiment, the simultaneous and equal amount calculation unit 60 may receive a power command transmitted from the power server 200. In one embodiment, the simultaneous and equal amount calculation unit 60 may receive a power command including a value of the suppression amount of power generation (for example, %). Also, in one embodiment, the simultaneous and equal amount calculation unit 60 may receive, as the power command transmitted from the power server 200, the power command transmitted up to the day before a predetermined day, or the power command transmitted on the current day of the predetermined day. In this case, the simultaneous and equal amount calculation unit 60 may transmit the power generation plan of the reverse power flow generated in consideration of the power command transmitted from the power server 200 to the output control unit 70.

[0056] In this way, the simultaneous and equal amount calculation unit 60 may generate a power generation plan at that site based on inputs such as power demand and solar irradiance at that site. The power generation plan generated in this way may be stored in an arbitrary storage unit such as a storage unit provided in the simultaneous and equal amount calculation unit 60. Also, the simultaneous and equal amount calculation unit 60 may submit (transmit) the power generation plan generated in this way to the wide-area institution server 300. Also, the simultaneous and equal amount calculation unit 60 may transmit the power generation plan generated as described above to the output control unit 70.

[0057] As described above, the simultaneous same amount calculation unit 60 may calculate a predicted value of reverse power flow based on the predicted value of power demand supplied from the demand calculation unit 50. In this case, the simultaneous same amount calculation unit 60 may register in advance a power generation plan that reasonably predicts power generation with the wide area institution server 300 and / or the output control unit 70. Then, the simultaneous same amount calculation unit 60 may match the power generation plan and the actual result of power generation on the day, for example, in units of 30 minutes (time segments of 30 minutes) (simultaneous same amount). Here, the power generation plan may be the amount of power flowing in the reverse direction in the power grid.

[0058] In one embodiment, the simultaneous same amount calculation unit 60 may calculate the amount of power of the power generation plan based on, for example, the following formula (4). (Amount of power of power generation plan) = (Output power amount of power generation unit 10) - (Power consumption amount of load 30) (4) That is, the amount of power of the power generation plan can be calculated as (Power generation amount of power generation unit 10 (power generation amount output from PCS)) - (Amount of power consumed for self - consumption at that site). Here, the amount of power consumed for self - consumption at that site can be calculated from the power generation amount of power generation unit 10 (power generation amount output from PCS) and the power demand at that site. Also, the power generation amount of power generation unit 10 (power generation amount output from PCS) can be calculated from data such as solar radiation amount.

[0059] Thus, in one embodiment, for example, the simultaneous same amount calculation unit 60A may calculate the amount of power flowing in the reverse direction from the first site to the power grid in a predetermined time segment based on the power demand of the first site and the amount of power generated by the power generation unit 10A at the first site.

[0060] The output control unit 70 controls the output of the electric power generated by the power generation unit 10. In this case, the output control unit 70 may control the output of the electric power output from the power generation unit 10, for example, by controlling the PCS included in the power generation unit 10. Further, the output control unit 70 may control the electric power input to the power adjustment unit 20 and / or the electric power output from the power adjustment unit 20. Also in this case, the output control unit 70 may control the electric power discharged by the power adjustment unit 20 and / or the electric power charged to the power adjustment unit 20, for example, by controlling the PCS included in the power adjustment unit 20.

[0061] In one embodiment, the output control unit 70 may control the output of the electric power generated by the power generation unit 10 based on the power generation plan received from the simultaneous same amount calculation unit 60 and / or the power command received from the power server 200. Further, the output control unit 70 may control the electric power input to the power adjustment unit 20 and / or the electric power output from the power adjustment unit 20 based on the power generation plan received from the simultaneous same amount calculation unit 60 and / or the power command received from the power server 200.

[0062] In this case, the output control unit 70 may receive the power generation plan of the reverse power flow electric power transmitted from the simultaneous same amount calculation unit 60. Here, the power generation plan received by the output control unit 70 from the simultaneous same amount calculation unit 60 may be, for example, power generation before a predetermined time such as a power generation plan made the day before or a power generation plan made several hours before, and the power generation plan for the current day.

[0063] Further, the output control unit 70 may receive the power command transmitted from the power server 200. In one embodiment, the output control unit 70 may receive a power command including a value of the suppression amount of power generation (for example, %) from the power server 200. Also in one embodiment, the output control unit 70 may receive, as the power command transmitted from the power server 200, a power command transmitted by the day before a predetermined day or a power command transmitted on the day of the predetermined day.

[0064] Furthermore, in one embodiment, the output control unit 70 may receive information on the power transmitted from the smart meter 40. Here, the information on the power transmitted from the smart meter 40 may be information on the power flowing in the reverse direction among the power generated by the power generation unit 10 (for example, the amount of power).

[0065] Based on the input of the information received as described above, the output control unit 70 may control the output of the power output from the power generation unit 10. For example, when controlling the power output by the power generation unit 10, the output control unit 70 may ensure that the power command by the electric utility is satisfied. Further, for example, when controlling the power output by the power generation unit 10, based on the power demand at the site where the power control system 1 is installed, the output control unit 70 may reduce the difference between the planned and actual amounts of power flowing in the reverse direction from the site to the power grid.

[0066] In this way, for example, the output control unit 70A may control the power output by the power generation unit 10 so as to satisfy the power command by the electric utility and reduce the difference between the planned and actual amounts of power flowing in the reverse direction from the first site to the power grid based on the power demand.

[0067] Also, based on the input of the information received as described above, the output control unit 70 may control the power input to the power conditioner 20 and / or the power output from the power conditioner 20. For example, when controlling the power input to the power conditioner 20 and / or the power output from the power conditioner 20, the output control unit 70 may ensure that the power command by the electric utility is satisfied. Further, for example, when controlling the power input to the power conditioner 20, based on the power demand at the site where the power control system 1 is installed, the output control unit 70 may reduce the difference between the planned and actual amounts of power flowing in the reverse direction from the site to the power grid. Also, for example, when controlling the power output from the power conditioner 20, based on the power demand at the site where the power control system 1 is installed, the output control unit 70 may reduce the difference between the planned and actual amounts of power flowing in the reverse direction from the site to the power grid.

[0068] In this way, for example, the output control unit 70A may control at least one of charging and discharging of the storage battery at the first site so as to satisfy the power command by the electric utility and reduce the difference between the planned and actual amounts of power flowing reversely from the first site to the power grid based on the power demand.

[0069] The output control unit 70 may transmit an output control value (e.g., %) for controlling the power output by the power generation unit 10 to the power generation unit 10. In this way, the output control unit 70 may set the output control value for the power generation unit 10. Further, the output control unit 70 may transmit an adjustment value (e.g., %) for adjusting the power input to the power adjustment unit 20 and / or the power output from the power adjustment unit 20 to the power adjustment unit 20. In this way, the output control unit 70 may set the adjustment value for the power adjustment unit 20.

[0070] When the output control unit 70 controls the power generation unit 10 and / or the power adjustment unit 20, it is ideal to make the difference between the planned and actual amounts of power flowing reversely to the power grid zero. That is, when the output control unit 70 performs control, it is ideal to make the planned and actual amounts of power flowing reversely to the power grid the same at the same time (same amount at the same time). In short, it is desirable that the plan (schedule) of the power flowing reversely as self-delivery is equal to the power actually flowing reversely as self-delivery. However, for example, a situation is also assumed where the actual power generation (performance) does not become the same as the power generation plan (schedule). Therefore, in one embodiment, when the output control unit 70 performs control, the difference between the planned and actual amounts of power flowing reversely to the power grid may be reduced as much as possible. When the planned and actual amounts of power flowing reversely to the power grid do not completely match, the difference may be settled as an imbalance charge.

[0071] Next, self-delivery using the power control systems 1A and 1B shown in FIG. 1 will be further described.

[0072] Hereinafter, as an example, it will be described that both the power control system 1A at the first site and the power control system 1B at the second site are facilities owned and / or managed by a certain company X (hereinafter, appropriately referred to as Company X). Here, Company X may be another company other than itself, for example, a jointly established consortium with an intimate relationship with itself. In particular, the power control system 1A at the first site is assumed to include, as an example, a solar power generation facility owned and / or managed by Company X. Also, the power control system 1B at the second site is assumed to include, as an example, a production factory facility owned and / or managed by Company X. Then, a situation (self-power transmission) will be described in which the power generated in the power control system 1A at the first site (for example, the power generation unit 10A) flows reversely into the power grid and is transmitted to the second site and consumed in the power control system 1B (for example, the load 30B). In this case, the first site having the power generation unit 10A and the second site having the load 30B are different power receiving locations. In one embodiment, when realizing self-power transmission, an attempt is made to calculate the same amount of the planned power generation value simultaneously while taking into account output suppression. Also, in one embodiment, the power control system 1A may control the power generation unit 10A and / or the power adjustment unit 20A so that the difference between the planned and actual amounts of power flowing reversely into the power grid is reduced as much as possible.

[0073] In self-power transmission, as a condition for the same amount of the planned power generation value simultaneously, it is required that the planned (scheduled) amount of power flowing reversely into the power grid and the actual amount of power flowing reversely (actual result) match (as much as possible). That is, in FIG. 1, it is required that the information transmitted from the smart meter 40 to the output control unit 70, that is, the planned (scheduled) information (for example, the amount of power) of the power flowing reversely among the power generated by the power generation unit 10 and the actual amount of power flowing reversely (actual result) match (as much as possible).

[0074] For example, when the amount of power actually generated (actual performance) is less than the amount of power in the generated power plan (scheduled), the shortfall in power as the difference becomes a shortage imbalance. In this case, the condition that the planned amount of power flowing in the reverse direction in the power grid (scheduled) matches the actual amount of power flowing in the reverse direction (actual performance) is not satisfied (generation imbalance). On the other hand, for example, when the amount of power actually generated (actual performance) is more than the amount of power in the generated power plan (scheduled), the excess power as the difference becomes a surplus imbalance. Also in this case, the condition that the planned amount of power flowing in the reverse direction in the power grid (scheduled) matches the actual amount of power flowing in the reverse direction (actual performance) is not satisfied (generation imbalance). Therefore, the power control system 1 according to one embodiment controls the power so as to reduce such generation imbalance.

[0075] FIG. 2 is a diagram showing a main part of a configuration example of a power control system according to one embodiment. That is, FIG. 2 is a diagram showing only the main functional parts when self-feed is performed in the power control system 1 as shown in FIG. 1.

[0076] As shown in FIG. 2, the power control system 1A' at the first site may include a power generation unit 10A, a power adjustment unit 20A, a load 30A, and a smart meter 40A. Also, as shown in FIG. 2, the power control system 1A' at the first site may include a control unit 80A. The power control system 1A' shown in FIG. 2 may not include some of the above-described functional parts, or may include other functional parts other than the above-described functional parts.

[0077] In one embodiment, the control unit 80A may be the same as the output control unit 70A shown in FIG. 1, or may be different. In one embodiment, the control unit 80A may be configured to include at least a part of any functional part included in the power control system 1A shown in FIG. 1. Also, in one embodiment, the control unit 80A may be configured as a functional part different from the functional parts included in the power control system 1A shown in FIG. 1.

[0078] In one embodiment, the control unit 80A controls the power generation by the power generation unit 10A. Also, in one embodiment, the control unit 80A controls at least one of charging and discharging of power by the power adjustment unit 20A. Here, the power generation unit 10A generates power at the first base. Also, the power generation unit 10A may include, for example, a solar cell and perform solar power generation at the first base. Further, the power adjustment unit 20A performs at least one of charging and discharging of power at the first base. Also, the power adjustment unit 20A may include, for example, a storage battery that performs at least one of charging and discharging of power at the first base.

[0079] As shown in FIG. 2, the power control system 1B' at the second base may include a load 30A and a smart meter 40A. The power control system 1B' shown in FIG. 2 may not include some of the above-described functional units, or may include other functional units other than the above-described functional units.

[0080] Hereinafter, as shown in FIG. 2, an example in which the first base is the self-delivery source and the second base is the self-delivery destination will be further described. That is, as shown in FIG. 2, a mode in which the power generated by the power generation unit 10A at the first base is self-delivered to the load 30B at the second base will be further described below.

[0081] In self-delivery, one day is divided into 48 time intervals every 30 minutes, and simultaneous and equal amounts of power transmission corresponding to the planned power values in these time intervals may be required. For this reason, in self-delivery, when adopting solar power generation, the power generation amount for the next day may be estimated from the weather forecast at the previous day and the planned power generation value may be created. However, the power that can be generated on the day depends on the weather on the day. Therefore, depending on factors such as the weather, the power when actually transmitting power from the first base to the grid power may include an imbalance (error from the planned value).

[0082] As described above, the power flowing in the reverse direction is affected by factors such as weather, and thus imbalance may occur. For this reason, conventionally, when the actually generated power exceeds the planned value, output limitation has been applied to the generated power for countermeasures. That is, for example, in the power control system 1A’, by applying output control to the PCS of the power generation unit 10A that performs solar power generation to suppress the generated power, the imbalance can be reduced. However, even with such countermeasures, it has been difficult to cope with a situation where the weather suddenly deteriorates, for example.

[0083] Therefore, for example, a method of reducing the above-described imbalance by using a storage battery or the like provided in the power conditioner 20A is also conceivable. However, for example, when installing a storage battery, if its capacity is increased, it will cost for installation and also require installation space. Therefore, even if a storage battery is installed, it is desirable to avoid increasing the capacity. In addition, when using such a storage battery, it is desirable to utilize it efficiently.

[0084] For this reason, the control unit 80A of the power control system 1A’ according to an embodiment may control, for example, the power conditioner 20A to perform a discharge close to the rated value in the first half of a 30-minute time period. By such control, it is possible to suppress the storage capacity to a level that can be compensated by only a part of the charge and discharge amount in a 30-minute time period.

[0085] FIG. 3 is a diagram for explaining an example of time division in the operation of the power control system 1A' according to an embodiment. As shown in FIG. 3, the control unit 80A of the power control system 1A' according to an embodiment may perform power control by dividing 24 hours of a day into 48 time divisions every 30 minutes. In FIG. 3, the horizontal axis represents the time division in 30 - minute units, and the vertical axis represents, as an example, the planned (predicted or planned value) power generation by the power generation unit 10A. Thus, the power in one time division may be scheduled as a constant value. The time division on the horizontal axis shown in FIG. 3 may start from the first grid at 0:00 am, and the 25th grid may start from noon. Due to solar power generation, power is generated with the sunrise, and the power generated around noon is large. Also, the vertical axis shown in FIG. 3 shows the maximum power output by the power control system 1A' as 1.

[0086] Photovoltaic power generation can suppress output. Therefore, in one embodiment, the control unit 80A may measure in real - time the integration of the power flowing back from the power control system 1A' to the power grid every 30 - minute time division. By such an operation, for example, using weather prediction and / or power market price information, the power flowing back from the power control system 1A' to the power grid can be controlled. Also, by controlling in this way, the power control system 1A' according to an embodiment can adjust the power actually generated on the day to match the power plan (schedule) formulated on the previous day. More specifically, the power control system 1A' according to an embodiment can adjust the integrated value of the power actually generated on the day to match the planned (scheduled) integrated value of the power in one time division, and perform the same control in all time divisions. Thereby, according to the power control system 1A' according to an embodiment, the occurrence of imbalance can be reduced.

[0087] In one embodiment, the control unit 80A may execute power control by setting a first time period and a second time period in each 30-minute time segment. Here, the second time period may be set after the first time period. Typically, for example, the control unit 80A may set the first half of each 30-minute time segment as the first time period and the second half as the second time period. However, the first time period and the second time period do not necessarily have to be time periods of the same length. In each time segment, the first time period may be a time period of any length at a timing earlier than the second time period. Also, in each time segment, the second time period may be a time period of any length at a timing later than the first time period.

[0088] In one embodiment, the control unit 80A may control, for example, such that in the first time period, the actual amount of power flowing in the reverse direction in the power grid is greater than the planned value (schedule) of the amount of power flowing in the reverse direction in the power grid. Also, the control unit 80A may control, for example, such that in the second time period, the planned value (schedule) of the amount of power flowing in the reverse direction in the power grid is greater than the actual amount of power flowing in the reverse direction in the power grid. When performing such control, the control unit 80A may execute at least one of control of power generation by the power generation unit 10A and control of charge and discharge of power by the power adjustment unit 20A. That is, in the first time period, control may be performed such that the amount of power output more than the planned value of the amount of power is the same as the amount of power insufficient with respect to the planned value of the amount of power in the second time period.

[0089] That is, in one embodiment, the power control system 1A' transmits more power than planned in the first time period. For this reason, when the planned value of the amount of power flowing in the reverse direction in the power grid is greater than the amount of power actually generated, the power control system 1A' may supply power by discharging the storage battery of the power adjustment unit 20A. Here, when discharging power from the power adjustment unit 20A, the control unit 80A may adjust the amount of power to be discharged over time as a large output close to the rated value. In this way, by discharging in a region where the efficiency of the storage battery is high, the loss of the storage battery can be reduced.

[0090] Also, in one embodiment, the control unit 80A may charge the power conditioner 20A in preparation for the next first-time period discharge at the second time period. Here, based on the latest weather forecast, charging at the second time period may be performed to balance the overall power control. Even if the power generation plan was submitted the day before, the power control system 1A' may determine whether it is possible to charge or discharge in each time period by obtaining the actual weather forecast during operation. That is, the control unit 80A may change the temporal width of power surplus and / or suppression according to the stability of weather changes.

[0091] Thus, in one embodiment, the control unit 80A may control such that the actual amount of power flowing reversely from the first site to the power grid in the first time period becomes larger than planned for each predetermined time interval. In this case, the control unit 80A may control such that power is discharged by the power conditioner 20A so that the actual amount of power flowing reversely from the first site to the power grid in the first time period becomes larger than planned. In one embodiment, together with the above control, the control unit 80A may control such that the actual amount of power flowing reversely from the first site to the power grid in the second time period after the first time period becomes smaller than planned. In this case, the control unit 80A may control such that power is charged by the power conditioner 20A so that the actual amount of power flowing reversely from the first site to the power grid in the second time period becomes smaller than planned.

[0092] According to one embodiment, by controlling in this way, the risk caused by weather fluctuations can be reduced in each time interval such as 30 minutes. Also, the power conditioner 20A performs charging and discharging only in some time periods in each time interval such as 30 minutes. Therefore, according to one embodiment, the capacity of the storage battery included in the power conditioner 20A can be made relatively small. Furthermore, according to one embodiment, by using the storage battery included in the power conditioner 20A at a time when the market power price is high, imbalance can be reduced.

[0093] Next, with reference to FIGS. 4 to 7, the power control by the power control system 1A' according to an embodiment will be described more specifically. FIGS. 4 to 7 illustrate the power control in the filled time segments (i.e., the 15th and 16th time segments) in the bar graph shown in FIG. 3. That is, in FIGS. 4 to 7, it may be assumed that about 0.3 of the rated power is expected as the actual power generation in the first time segment, and about 0.4 of the rated power is expected as the actual power generation in the next time segment. Hereinafter, the first time segment shown in FIGS. 4 to 7 is denoted as "time segment 15", and the next time segment (the time segment following time segment 15) shown in FIGS. 4 to 7 is denoted as "time segment 16".

[0094] Also, in FIGS. 4 to 7, the power generation that the power control system 1A' can actually output is shown as a line graph as "actual power generation". Further, in FIGS. 4 to 7, the amount of power flowing backward from the first base to the power grid is shown as "transmission amount". Furthermore, in FIGS. 4 to 7, the planned value (schedule) of the amount of power flowing backward to the power grid is shown by a broken line.

[0095] In the example shown in FIG. 4, in time intervals 15 and 16, the actual power generation exceeds the planned value (schedule) of the amount of power flowing in the reverse direction to the power grid. On the other hand, in the example shown in FIG. 4, output control is imposed in time intervals 15 and 16. In such a case, the control unit 80A may set an output that does not exceed the output control as the output of the power control system 1A'. Therefore, as shown in FIG. 4, in the first time period of time interval 15, the control unit 80A may output power exceeding the expected rated output of 0.3. That is, since the actual power generation is more in the first time period of time interval 15, a reverse power flow exceeding the planned value may be output. On the other hand, since it is necessary to balance with the suppression in the second time period of time interval 15, an upper limit may be set by the output control. By performing the output control in this way, the capacity of the storage battery can be reduced. Here, the output control may be control for performing imbalance suppression, rather than a command imposed by the power company. For example, when a command for output suppression is imposed by the power company, that value may be used as the planned value. Also, in the first time period of time interval 16, the control unit 80A may output power exceeding the expected rated output of 0.4.

[0096] In this case, as shown in FIG. 4, in the second time period of time interval 15, the control unit 80A may charge the power conditioner 20A in order to match the planned value of the amount of power. Also, in the second time period of time interval 16, the control unit 80A may perform output control in order to match the planned value of the amount of power. Also, at the end of the first time period of time intervals 15 and 16, the surplus amount of power output more than the planned value may be calculated. Then, based on the surplus amount of power, a target value of the power flowing in the reverse direction to the power grid may be set in the second time period of time intervals 15 and 16, and control may be performed to match the target value. In this case, in the second time period of time intervals 15 and 16, the target value may be set so that the power flowing in the reverse direction to the power grid decreases as time passes.

[0097] Even in the example shown in FIG. 5, in time period 15 and time period 16, the actual power generation exceeds the rated output expected as the actual power generation. In such a case, the control unit 80A may output power exceeding the expected rated output in the first time limit of time period 15 and the first time limit of time period 16, respectively. Here, as shown in FIG. 5, the control unit 80A may cover the power insufficient for the actual power generation by the discharge of the power conditioner 20A in the first time limit of time period 15. That is, when there is not much difference between the power generation amount by the power generation unit 10a and the planned value as in time period 15 shown in FIG. 5, it may discharge extra power in advance in the first time limit. For example, it is set so that the power flowing in the reverse direction to the power grid in the first time limit becomes a predetermined power obtained by multiplying the rated output by a predetermined ratio exceeding 1 (for example, 1.1, etc.), and the power insufficient for the actual power generation with respect to the predetermined power may be covered by the discharge of the power conditioner 20A. In this case, since the storage capacity of the power conditioner 20A decreases, the control unit 80A may charge the power conditioner 20A in the second time limit of time period 15 as shown in FIG. 5.

[0098] In the example shown in FIG. 6, in time segments 15 and 16, there are portions where the actual power generation is below the rated output expected as the actual power generation. In such a case, the control unit 80A may output power exceeding the expected rated output in the first time period of time segment 15. Here, as shown in FIG. 6, the control unit 80A may cover the power insufficient for the actual power generation by the discharge of the power conditioner 20A in the first time period of time segment 15. For example, it may be set such that the power flowing in reverse to the power grid in the first time period becomes a predetermined power obtained by multiplying the rated output by a predetermined ratio exceeding 1 (for example, 1.1, etc.), and the power insufficient for the actual power generation with respect to the predetermined power may be covered by the discharge of the power conditioner 20A. In this case, since the storage capacity of the power conditioner 20A decreases, the control unit 80A may charge the power conditioner 20A in the second time period of time segment 15 and the second time period of time segment 16 as shown in FIG. 6. Also, in the second time period of time segment 15, when there is a portion where the actual power generation is below the rated output expected as the actual power generation, it may flow in reverse to the power grid in accordance with the actual power generation. Then, when it is determined that the planned value of the power amount can be grasped, the power conditioner 20A may be charged. As shown in FIG. 6, when it is predicted that in the first half of time segment 16, there is a portion where the actual power generation is below the rated output expected as the actual power generation, and in the second half of time segment 16, there is a portion where the actual power generation exceeds the rated output expected as the actual power generation, the control may be performed as follows. That is, within the time of time segment 16, when it can be determined that the power amount of the exceeding portion is larger than the power amount of the falling below portion, in the first time period, it may flow in reverse to the power grid in accordance with the actual power generation. And when the power amounts of the exceeding portion and the falling below portion become the same, the first time period ends and the second time period starts, and the power conditioner 20A may be charged.

[0099] In the example shown in FIG. 7, in time period 16, there is a portion where the actual power generation is lower than the rated output expected as the actual power generation. In such a case, the control unit 80A may output power exceeding the expected rated output in the first time slot of time period 15 and the first time slot of time period 16, respectively. Here, as shown in FIG. 7, the control unit 80A may charge the power conditioner 20A in the second time slot of time period 15. As shown in FIG. 7, the control unit 80A may cover the power insufficient for the actual power generation by discharging the power conditioner 20A in the first time slot of time period 16. That is, when it is predicted that a portion where the actual power generation is lower than the rated output expected as the actual power generation will occur in the second half of time period 16, in the first time slot of time period 16, a reverse power flow occurs in the power grid according to the actual power generation. Then, when it is determined in the second time slot of time period 16 that the planned value of the power amount cannot be grasped, the power conditioner 20A may be discharged to cover it.

[0100] Next, the operation of the power control system 1A' will be further described. FIG. 8 is a flowchart for explaining the operation of the power control system 1A'.

[0101] When the operation shown in FIG. 8 starts, the control unit 80A of the power control system 1A' acquires information on the planned power generated at the first site (step S11). Next, the control unit 80A acquires information on the predicted value of the power amount that can have a reverse power flow in the next time period at the first site (step S12). Next, when output suppression is issued from an electric utility such as an electric power company at the first site, the control unit 80A acquires information on the output control of power (step S13). Steps S11 to S13 may be executed in any order.

[0102] Next, based on the acquired information, the control unit 80A formulates power control so that the actual amount of reverse power flow in the first time period becomes larger than planned (step S14). Also, based on the acquired information, the control unit 80A formulates power control so that the actual amount of reverse power flow in the second time period becomes smaller than planned (step S15). Here, before the operation of step S15, information on the predicted value of the latest available reverse power amount may be acquired, and the actual amount of reverse power flow in the first time period may be acquired to formulate power control in the second time period. The operations of step S12, step S14, and step S15 may be executed for each time segment such as, for example, 30 minutes as described above. Also, when the actual amount of reverse power flow significantly deviates from the formulated target value, the operations of step S14 and step S15 may be executed again.

[0103] Next, as set in step S14 and step S15, the control unit 80A controls the power generation by the power generation unit 10A and the output (or charge / discharge) by the power adjustment unit 20A (step S16).

[0104] As described above, in the power control system 1A' according to an embodiment, the control unit 80A may control so that the difference between the planned and actual amounts of reverse power flow from the first base point to the power grid is reduced for each of the predetermined time segments. Also, in the power control system 1A' according to an embodiment, the control unit 80A may control to satisfy the power command by the electric utility. Also, in the power control system 1A' according to an embodiment, the control unit 80A may control the predetermined time segment as a 30-minute unit time segment divided into 48 segments in a day.

[0105] The above-described embodiments have been described for implementation as systems such as the power control system 1A at the first site and the power control system 1B at the second site. However, the system according to one embodiment may include not only the power control system 1A at the first site and the power control system 1B at the second site, but also the power control system 1C at the third site, or may include more power control systems. In this case, for example, the simultaneous power calculation unit 60A may calculate the amount of power flowing backward from the first site to the power grid in a predetermined time period and supplied to a plurality of sites different from the first site, based on the power demand at the first site and the amount of power generated by the power generation unit at the first site. Further, the output control unit 70A may control so as to satisfy the power command by the electric utility and reduce the difference between the planned and actual amounts of power supplied from the first site to a plurality of sites different from the first site and flowing backward to the power grid based on the power demand.

[0106] Also, in one embodiment, the control unit 80A may control so as to reduce the difference between the planned and actual amounts of power supplied from the first site to the second site different from the first site and flowing backward to the power grid for each predetermined time period. Also, in one embodiment, the control unit 80A may control so as to reduce the difference between the planned and actual amounts of power supplied from the first site to a plurality of sites different from the first site and flowing backward to the power grid for each predetermined time period.

[0107] The above-described embodiments have been described assuming a mode in which the electric power generated by the power generation unit 10A at the first base is self-delivered to the load 30B at the second base. However, as described above, in one embodiment, the electric power generated by the power generation unit 10B at the second base may be self-delivered to the load 30A at the first base. In this case, the simultaneous same amount calculation unit 60A may calculate the amount of power flowing backward from the second base to the power grid in a predetermined time period and supplied to the first base, based on the power demand at the second base and the amount of power generated by the power generation unit at the second base. Further, the output control unit 70A may control so as to satisfy the power command by the electric power company and reduce the difference between the planned and actual amounts of the power flowing backward from the second base to the power grid and supplied to the first base, based on the power demand at the second base.

[0108] In the above-described embodiments, a system such as the power control system 1 may include a power generation unit 10 that performs solar power generation or the like. In this case, for example, the power control system 1A may include the power generation unit 10A installed at the first base, and the power control system 1B may include the power generation unit 10B installed at the second base. On the other hand, a system such as the power control system 1 may not include the power generation unit 10 as a system that controls the power generation unit 10 that performs solar power generation or the like.

[0109] Further, the above-described embodiments may be implemented, for example, as a control method for the above-described system or device. Further, the above-described embodiments may be implemented, for example, as a program executed in a computer of the above-described system or device. Furthermore, the above-described embodiments may be implemented, for example, as a recording medium that records a program executed in a computer of the above-described system or device, that is, a computer-readable recording medium.

Description of Reference Numerals

[0110] 1 Power control system 10 Power generation unit 20 Power adjustment unit 30 Load 40 Smart meter 50 Calculation required part 60 Simultaneous and equal amount calculation part 70 Output control part 80 Control part 200 Power server 300 Wide area institution server 400 Weather server

Claims

1. A power generation unit that generates power at the first base, A power conditioner that performs at least one of charging and discharging power at the first base, A control unit that controls the power generation by the power generation unit and at least one of charging and discharging power by the power conditioner, Comprising, The control unit controls such that, for each predetermined time period, the actual value of the power flowing back from the first base to the power grid at the first time limit exceeds the planned value, and controls such that the actual value of the power flowing back from the first base to the power grid at the second time limit after the first time limit does not exceed the planned value. A power control system.

2. The control unit controls such that the difference between the planned and actual values of the power flowing back from the first base to the power grid is reduced for each predetermined time period. The power control system according to claim 1.

3. The control unit controls to satisfy the power command by the electric utility. The power control system according to claim 1 or 2.

4. The control unit controls the predetermined time period as a 30-minute time period divided into 48 divisions in a day. The power control system according to any one of claims 1 to 3.

5. The control unit controls such that power is discharged by the power conditioner so that the actual amount of power flowing back from the first base to the power grid at the first time limit is greater than the plan. The power control system according to any one of claims 1 to 4.

6. The control unit controls such that power is charged by the power conditioner so that the actual amount of power flowing back from the first base to the power grid at the second time limit is less than the plan. The power control system according to any one of claims 1 to 5.

7. The control unit controls such that, for each predetermined time period, the difference between the planned and actual values of the power flowing back from the first base to the power grid and supplied to a second base different from the first base is reduced. The power control system according to any one of claims 1 to 6.

8. The control unit controls such that, for each predetermined time period, the difference between the planned and actual values of the power flowing back from the first base to the power grid and supplied to a plurality of bases different from the first base is reduced. The power control system according to any one of claims 1 to 6.

9. The power control system according to any one of claims 1 to 8, wherein the power adjustment unit includes a storage battery that performs at least one of charging and discharging of power at the first site.

10. The power control system according to any one of claims 1 to 9, wherein the power generation unit performs solar power generation at the first site.

11. A power control device that controls power generation by a power generation unit at a first site and at least one of charging and discharging of power by a power adjustment unit at the first site, A power control device that controls so that the actual value of the amount of power flowing backward from the first site to the power grid at the first time limit exceeds the planned value for each predetermined time period, and controls so that the actual value of the amount of power flowing backward from the first site to the power grid at the second time limit after the first time limit does not exceed the planned value.

Images