Power control system

Abstract

To provide a power control system which can realize efficient self-consignment of power to be generated.SOLUTION: A power control system comprises: a power generation unit which generates power at a first base; a first transformer which transforms voltage of the power to be generated by the power generation unit; a first circuit breaker which turns a path of power transformed by the first transformer and inversely flowing to a power system on or off; and a control unit which controls power generation by the power generation unit and controls on or off of the first circuit breaker. The control unit controls the first circuit breaker to be turned off when a scheduled value of a power amount to be self-consigned from the first base becomes zero.SELECTED DRAWING: Figure 2

Description

Technical Field

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

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 solar 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 solar power generation is added during a period of high power demand, 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 power in the power generation facility so as to satisfy the power command. 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 the self-delivery of the generated power.

[0006] An object of the present disclosure is to provide a power control system capable of realizing efficient 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 first transformer that transforms the voltage of the power generated by the power generation unit, a first switch that turns on or off a path of power that is transformed by the first transformer and flows reversely into the power grid, a control unit that controls the power generation by the power generation unit and also controls the on or off state of the first switch, A power source capable of supplying power charged from the power system to the control unit, A second transformer that transforms the voltage of the power supplied from the power system to the power source, A second switch that turns on or off the path of the power supplied from the power system to the second transformer, and is provided with. When the planned value of the amount of power to be self-fed from the first site becomes zero, the control unit controls to turn off the first switch When controlling to turn off the first switch, turn off the second switch .

[0008] Further, a power control system according to an embodiment includes a power generation unit that generates power at a first site, a first transformer that transforms the voltage of the power generated by the power generation unit, a second transformer that transforms the voltage of the power that is transformed by the first transformer and flows reversely into the power grid, a first switch that turns on or off a path of power that is transformed by the first transformer and supplied to the second transformer, a second switch that turns on or off a path of power that is transformed by the second transformer and flows reversely into the power grid, a power conditioner that performs at least one of charging and discharging power at the first site, a third transformer that transforms the voltage of the power for which at least one of charging and discharging is performed by the power conditioner, A control unit that controls at least one of power generation by the power generation unit and charging and discharging of power by the power adjustment unit, and controls on or off of the first switch and the second switch. It is provided with. When the predicted value of the amount of power to be self-delivered from the first base point becomes zero, the control unit controls the second switch to be turned off.

Effect of the Invention

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

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode 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 power. Further, the power control system and / or the power control device may include a function of controlling power. The function of the power control system and / or the power control device is not limited to the function of controlling power, and may have other functions.

[0012] In the present disclosure, "self-power transmission" may be defined, for example, as that stipulated in the "Guidelines for Self-Power Transmission" (implemented on April 1, 2014, amended on November 18, 2021) established by the Agency for Natural Resources and Energy, an external bureau of the Ministry of Economy, Trade and Industry. That is, self-power transmission may refer to the power transmission service provided by a general electricity supplier when a person who installs a private power generation facility transmits the electricity generated using the private power generation facility to a factory or the like at another location of the person who installs the private power generation facility via the power transmission and distribution network maintained and operated by the general electricity supplier. Also, as recently amended, self-power transmission may be regarded as having an expanded scope of application so that it can be transmitted not only to oneself but also 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 schematically shown as a base in the area above the dashed-dotted line shown on the upper side of FIG. 1, and the second base is schematically shown as a base 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, for example, any location where power generation and / or consumption is assumed, such as a location for so-called stand-alone solar power generation, the office or business office of each operator, a factory, and an apartment house. Also, 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 not shown. Also, 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 not shown.

[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, the power control system 1B may also be described based on the same or similar gist as the power control system 1A.

[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 a 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, hydro power 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 the reverse direction in the power grid. Also, the power flowing in the reverse direction in this way may be used as self-supplied 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 (for example, %) 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 adjustment unit 20A may function to adjust the power at the first base. Also, the power adjustment unit 20B may function to adjust the power at the second base. The power adjustment unit 20 may include at least one of a function of making it possible to output power to the outside and a function of making it possible to input power from the outside. Specifically, the power adjustment unit 20 may include, for example, a storage battery. The power adjustment unit 20 may appropriately include a PCS or the like that controls at least one of the power output by the power adjustment unit 20 and the power input to the power adjustment unit 20. That is, in this case, the PCS of the power adjustment unit 20 may control at least one of the power discharged by the storage battery of the power adjustment unit 20 and the power charged to the storage battery. By the power charged and discharged by the power adjustment unit 20, the power control system 1 can obtain an adjustment force for achieving the same amount at the same time of the planned value described later.

[0026] The power adjustment unit 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 adjustment unit 20 can be configured by various known technologies. Therefore, a more detailed description of the power adjustment unit 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). Further, 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. Further, 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. Further, 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. Further, the load 30 may consume at least a part of the power discharged by the power conditioner 20. Further, the load 30 may consume at least a part of the power purchased from the power grid. 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 techniques. 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, power can be self-delivered 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-delivered 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-delivered to the load 30A at the first base. When realizing such bidirectional self-delivery, a functional unit for determining the direction of self-delivery (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 (e.g., power amount) 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 (e.g., power amount) 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 (e.g., power amount) 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-delivery.

[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 may be realized 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 be stored in an arbitrary storage unit, respectively.

[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, 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 power-related command (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 power output by power generation when the balance between power demand and supply in the power system cannot be achieved. Hereinafter, such a command that requests suppression of 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 equal 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 equal amount calculation unit 60 via the output control unit 70, for example. Further, the simultaneous equal 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 equal 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 of power generation (for example, %) to the simultaneous equal 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 before 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 (Act No. 170 of July 11, 1964). All electricity providers in Japan are obliged to become members of the organization. This organization monitors the supply and demand situation of electricity of each member company and instructs other members to supply electricity to a member whose supply and demand situation has deteriorated. 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, for example, at least any one of 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 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 the reverse direction and / or purchased power 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 power) + (Purchased power) (1) In formula (1), the charge and discharge power of the power adjustment unit 20 is set as positive power for discharge and negative power for charge. The actual value of the power demand calculated in this way may be stored in an arbitrary storage unit such as the storage unit provided in the demand calculation unit 50.

[0047] Also, in one embodiment, the demand calculation unit 50 may receive weather data such as 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 the weather server 400, for example, 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. Also, in one embodiment, the demand calculation unit 50 may calculate various predictions of power demand, such as a prediction after a predetermined time such as a prediction for the next day or a prediction after several hours, and a prediction 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] In this way, 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 defined as the power generation plan and the actual value of reverse power flow being the same amount at the same time, on the premise that the power demand (power purchase) at the power purchase destination is greater than the reverse power flow of the power from the self-delivery source. In one embodiment, 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.

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

[0052] Further, 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 issued the previous day or a prediction issued 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 power generation unit 10) = (Solar radiation amount) × (Coefficient) (2) Here, in the "Method for Estimating the Electric Power Generation Amount of a Photovoltaic Power Generation System" (JIS C8907:2005) according to the Japanese Industrial Standards (JIS), a formula for estimating the electric power generation amount of 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 the reverse power flow at the base where the power control system 1 is installed based on, for example, the following formula (3). Here, reverse power flow occurs when the generated power is greater than the power demand of the power consumption. Therefore, calculating the reverse power flow based on formula (3) may be, for example, when the generated power is greater than the demand power. (Reverse power flow) = (Power generation of 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 the power generation plan, or a value obtained by multiplying a coefficient in this calculation result may be generated as the 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 power generation plan of the generated 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 several 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 by the day before a predetermined day or the power command transmitted on the 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 the 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 included 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 - quantity calculation unit 60 may calculate a predicted value of reverse - power - flow electric power based on the predicted value of power demand supplied from the demand calculation unit 50. In this case, the simultaneous same - quantity 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 - quantity 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 (30 - minute time intervals) (simultaneous same - quantity). Here, the power generation plan may be the amount of electric power flowing in the reverse direction in the power grid.

[0058] In one embodiment, the simultaneous same - quantity calculation unit 60 may calculate the amount of electric power of the power generation plan based on, for example, the following formula (4). (Amount of electric power of power generation plan)=(Output electric power amount of power generation unit 10)−(Power consumption amount of load 30) (4) That is, the amount of electric 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 electric power consumed for self - consumption at that site). Here, the amount of electric 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 - quantity calculation unit 60A may calculate the amount of electric power flowing in the reverse direction from the first site to the power grid in a predetermined time interval based on the power demand of the first site and the amount of electric power generated by the power generation unit 10A at the first site.

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

[0061] In one embodiment, the output control unit 70 may control the power output from 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 power input to the power adjustment unit 20 and / or the 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 for reverse power flow 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 previous day or a power generation plan made several hours ago, 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 power generation suppression amount (e.g., %) 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 (e.g., the amount of power) among the power generated by the power generation unit 10.

[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 backward 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 backward 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 backward to the power grid the same at the same time (same time and same amount). In short, it is desirable that the plan (schedule) of the power flowing backward as self-delivery is equal to the power actually flowing backward as self-delivery. However, for example, a situation is 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 backward to the power grid may be reduced as much as possible. If the planned and actual amounts of power flowing backward 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 consortium jointly established with a company with which it has an intimate relationship. In particular, as an example, the power control system 1A at the first site is assumed to include a solar power generation facility owned and / or managed by Company X. Further, as an example, the power control system 1B at the second site is assumed to include a production factory facility owned and / or managed by Company X. Then, a situation (self-feed) 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-feed, an attempt is made to calculate the same amount of the planned value of power generation 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 conditioning 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-feed, as a condition for the same amount of the planned value of power generation 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 (schedule), the insufficient amount of power as the difference becomes a shortage imbalance. In this case, the condition that the planned amount of power flowing in reverse to the power grid (schedule) matches the actual amount of power flowing in reverse (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 (schedule), the excess amount of power as the difference becomes a surplus imbalance. Also in this case, the condition that the planned amount of power flowing in reverse to the power grid (schedule) matches the actual amount of power flowing in reverse (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] (First Embodiment) FIG. 2 is a diagram showing a main part of a configuration example of the power control system according to the first embodiment. That is, FIG. 2 is a diagram showing only the main functional parts when performing self-feed according to the first embodiment 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 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. Further, as shown in FIG. 2, the power control system 1A' at the first site may include a power source 90A.

[0077] Also, as shown in FIG. 2, the power control system 1A' may include functional parts not shown in FIG. 1. For example, as shown in FIG. 2, the power control system 1A' may include a first transformer 12A connected between the smart meter 40A and the power generation unit 10A. Also, as shown in FIG. 2, the power control system 1A' may include a second transformer 92A connected between the smart meter 40A and the power source 90A. Further, as shown in FIG. 2, the power control system 1A' may include a transformer 32A connected between the smart meter 40A and the load 30A.

[0078] Furthermore, as shown in FIG. 2, the power control system 1A' may include a first switch S1. Also, as shown in FIG. 2, the power control system 1A' may include a second switch S2. Furthermore, as shown in FIG. 2, the power control system 1A' may include switches Sa and / or Sb, etc.

[0079] The power control system 1A' shown in FIG. 2 may not include some of the aforementioned functional units, or may include other functional units other than the aforementioned functional units. Also, in the power control system 1A' shown in FIG. 2, for example, a device configured to include at least any one of the smart meter 40A, switch Sa, first switch S1, second switch S2, first transformer 12A, second transformer 92A, and transformer 32A may be used as a substation facility.

[0080] The first transformer 12A transforms the voltage of the power generated by the power generation unit 10A (which generates power at the first base) to a predetermined voltage. The second transformer 92A transforms the voltage of the power supplied to at least one of the power source 90A and the control unit 80A from the power grid to a predetermined voltage. The transformer 32A transforms the voltage of the power supplied to the load 30A to a predetermined voltage. Since these transformers may employ transformers used in conventional power control systems, etc., a more detailed description is omitted.

[0081] In the first embodiment, the control unit 80A may be the same as the output control unit 70A shown in FIG. 1, or may be different. In the first embodiment, the control unit 80A may be configured to include at least a part of any functional unit included in the power control system 1A shown in FIG. 1. Also, in the first embodiment, the control unit 80A may be configured as a functional unit different from the functional units included in the power control system 1A shown in FIG. 1. Also, the control unit 80A may be configured to obtain at least one of the power generation information of the power generation unit 10A and the power information of the smart meter.

[0082] In the first embodiment, the control unit 80A controls the power generation by the power generation unit 10A. Here, the power generation unit 10A generates power at the first base. Further, the power generation unit 10A may include, for example, a solar cell and perform solar power generation at the first base. Also, in the first embodiment, the control unit 80A may control the on or off of the first switch S1. Hereinafter, "on" of the switch means "turn on", "close", "activate", or "close" the operation of the switch. Also, "off" of the switch means "turn off", "open", "release", "open" the operation of the switch. Further, in the first embodiment, the control unit 80A may control the on or off of the second switch S2. Also, in the first embodiment, the control unit 80A may appropriately control the on or off of at least one of the switch Sa and the switch Sb. In FIG. 2, the illustration of the control lines for the control unit 80A to control the switch Sa and the switch Sb is omitted.

[0083] The power supply 90 may be a power supply such as an uninterruptible power supply (UPS) including, for example, a storage battery. The power supply 90 can supply the charged power to the control unit 80A even when, for example, the power control system 1A' cannot receive power from the power grid. Thereby, the control unit 80A can operate the power control system 1A' even when it cannot receive power from the power grid. In this way, the power supply 90A may be configured to be able to supply the power charged from the power grid to the control unit 80A. Also, the power supply 90 may use the charged power for imbalance adjustment. Since the power supply 90 can employ a known UPS or the like, a more detailed description is omitted.

[0084] As shown in FIG. 2, the switch Sa may be connected between the smart meter 40A and the first switch S1. The first switch S1 may be connected between the switch Sa and the transformer 12A. Therefore, the first switch S1 can turn on or off the path of the power (which is the power generated by the power generation unit 10A and transformed by the first transformer 12A and flowing in reverse to the power grid). The switch Sb may be connected between the transformer 12A and the power generation unit 10A. The second switch S2 may be connected between the connection point of the switch Sa and the first switch S1 and the transformer 92A. Therefore, the second switch S2 can turn on or off the path of the power supplied from the power grid to the second transformer 92A. Since these switches may adopt the switches used in a conventional power control system or the like, a more detailed description is omitted.

[0085] Next, the operation of the power control system 1A' according to the first embodiment shown in FIG. 2 will be described. FIG. 3 is a flowchart for explaining the operation of the power control system 1A' according to the first embodiment.

[0086] The operation shown in FIG. 3 may start when the power control system 1A' according to the first embodiment performs control of power related to self-feed or when such power control has already been performed.

[0087] When the operation shown in FIG. 3 starts, the control unit 80A of the power control system 1A' may determine in step S11 whether the planned value (planned amount) of the power to be self-fed from the power control system 1A' is zero (judgment 1). That is, in one embodiment, the control unit 80A may determine as judgment 1 whether the self-feed plan is zero. Also, the control unit 80A may determine in step S11 whether the amount of power generated by the power generation unit 10A is zero (judgment 2). That is, in one embodiment, the control unit 80A may determine as judgment 2 whether the solar power generation by the power generation unit 10A has stopped (for example, at night).

[0088] In step S11, when at least one of the result of determination 1 being zero and the result of determination 2 being zero is satisfied, the control unit 80A performs the operation of step S13. That is, in step S11, when the result of determination 1 is zero and / or the result of determination 2 is zero, the control unit 80A performs the operation of step S13. On the other hand, in step S11, when the result of determination 1 is not zero or the result of determination 2 is not zero, the control unit 80A performs the operation of step S15.

[0089] In step S13, the control unit 80A controls to turn off the first switch S1. On the other hand, in step S15, the control unit 80A controls to turn on the first switch S1.

[0090] Thus, in the first embodiment, when the planned value (planned amount) of the power amount to be self-delivered from the power control system 1A' (the first base) becomes zero, the control unit 80A may control to turn off the first switch S1. In particular, when the planned value (planned amount) of the power amount flowing backward from the first base to the power grid becomes zero, the control unit 80A may control to turn off the first switch S1. Also, in the first embodiment, when the power amount generated by the power generation unit 10A becomes zero, the control unit 80A may control to turn off the first switch S1. In particular, when the PCS (power conditioner) that controls the power generation by the power generation unit 10A is stopped, the control unit 80A may control to turn off the first switch S1. In the above cases, the control unit 80A may obtain the time information when the planned value of self-delivery becomes zero, and control to turn off the first switch S1 at the obtained time. On the other hand, when the planned value (planned amount) of the power amount to be self-delivered from the power control system 1A' (the first base) does not become zero, the control unit 80A may control to turn on the first switch S1. Also, when the power conditioner that controls the power generation by the power generation unit 10A is started, the control unit 80A may control to turn on the first switch S1.

[0091] In the power control system 1A', the transformer 12A that transforms the power generated by the power generation unit 10A may constantly incur losses if the first switch S1 is on even when the power generation unit 10A is not generating power. Therefore, when performing self-feed using the power generated by the power generation unit 10 in the power control system 1A' according to the first embodiment, control linked to the plan or operation of self-feed is carried out. Specifically, in the power control system 1A' according to the first embodiment, when the planned value of self-feed is zero and / or when the PCS of the power generation unit 10A stops, the first switch S1 may be turned off. Also, in the power control system 1A', when the planned value of self-feed is not zero or when the PCS of the power generation unit 10A starts, the first switch S1 may be turned on. Therefore, according to the power control system 1A', it is possible to reduce the losses caused by the transformer during the time periods when power is not transmitted by self-feed using the power generated by the power generation unit 10A.

[0092] Also, in step S13 shown in FIG. 3, when the control unit 80A controls to turn off the first switch S1, it may also turn off the second switch S2. The second transformer 92A may constantly generate losses if the second switch S2 is on even when the control unit 80A is not operating. Therefore, when performing self-feed by the power generation of the power generation unit 10, the power control system 1A' according to the first embodiment may perform control linked to the plan and / or operation of the self-feed. Specifically, when the planned value of the self-feed is zero, the power control system 1A' according to the first embodiment may turn off the second switch S2. Also, when the planned value of the self-feed is not zero, the power control system 1A' may turn on the second switch S2. Thus, according to the power control system 1A', it is possible to reduce the loss by the transformer in the time zone when power is not transmitted by the self-feed by the power generation of the power generation unit 10A. Here, even when it is necessary to keep the control unit 80A in the standby state, the standby power at that time is slight. For this reason, the control unit 80A may be supplied with power from the power supply 90. Also, when the control unit 80A is configured to include at least a part of any functional unit included in the power control system 1A shown in FIG. 1, the functional unit may turn on the second switch S2 during operation and turn off the second switch S2 when the functional unit is not operating.

[0093] (Second Embodiment) FIG. 4 is a diagram showing a main part of a configuration example of the power control system according to the second embodiment. That is, FIG. 4 is a diagram showing only the main functional units when performing self-feed according to the second embodiment in the power control system 1 as shown in FIG. 1. The power control system 1A" according to the second embodiment shown in FIG. 4 partially changes the configuration of the power control system 1A' according to the first embodiment shown in FIG. 2. Therefore, hereinafter, as an explanation of the power control system 1A" according to the second embodiment, the explanation will focus on the content different from the power control system 1A' according to the first embodiment, and the content similar to the power control system 1A' according to the first embodiment will be appropriately simplified or omitted.

[0094] As shown in FIG. 4, the power control system 1A” according to the second embodiment may further include a power adjustment unit 20A in addition to the functional units included in the power control system 1A’ according to the first embodiment. Further, different from the power control system 1A’ according to the first embodiment, the power control system 1A” according to the second embodiment may include at least any one of a first transformer 14A, a second transformer 12A, a third transformer 22A, and a fourth transformer 92A. Furthermore, different from the power control system 1A’ according to the first embodiment, the power control system 1A” according to the second embodiment may include at least any one of a first switch S3, a second switch S1, a third switch S2, and a switch S4. Also, in the power control system 1A” according to the second embodiment, the first switch S3 may be the same as or different from the switch Sb in the power control system 1A’ according to the first embodiment.

[0095] As shown in FIG. 4, in the power control system 1A”, a first transformer 14A and a second transformer 12A may be connected in series between the smart meter 40A and the power generation unit 10A. More specifically, as shown in FIG. 4, the first transformer 14A may be connected between the power generation unit 10A and the second transformer 12. Also, the second transformer 12A may be connected between the first transformer 14A and the smart meter 40A. Also, the second switch S1 may be connected between the switch Sa and the second transformer 12A. Also, the first switch S3 may be connected between the second transformer 12A and the first transformer 14A.

[0096] Also, as shown in FIG. 4, in the power control system 1A”, the third transformer 22A is connected to the second transformer 12A. Also, the third transformer 22A is connected to the power adjustment unit 20A. The switch S4 may be connected between the second transformer 12A and the third transformer 22A.

[0097] The "power control system 1A" shown in Fig. 4 may not include some of the aforementioned functional units, or may include other functional units other than the aforementioned functional units. Further, in the power control system 1A shown in Fig. 4, for example, devices configured to include at least any one of the smart meter 40A, switch Sa, second switch S1, third switch S2, second transformer 12A, transformer 32A, fourth transformer 92A, first switch S3, switch S4, first transformer 14A, and third transformer 22A may be used as the power receiving and transforming equipment.

[0098] The first transformer 14A transforms the voltage of the power generated by the power generation unit 10A (which generates power at the first base) to a predetermined voltage. The second transformer 12A transforms the voltage of the power that is transformed by the first transformer 14A and flows in reverse to the power grid. The third transformer 22A transforms the voltage of the power for which at least one of charging and discharging is performed by the power adjustment unit 20A. Further, the fourth transformer 92A transforms the voltage of the power supplied from the power grid to at least one of the power source 90A and the control unit 80A to a predetermined voltage. Since these transformers may employ the transformers used in conventional power control systems and the like, more detailed description thereof is omitted.

[0099] In the second embodiment, the control unit 80A controls the power generation by the power generation unit 10A. Here, the power generation unit 10A generates power at the first base. Further, the power generation unit 10A may include, for example, a solar cell and perform solar power generation at the first base. Also, in the second embodiment, the control unit 80A may control at least one of charging and discharging of the power by the power adjustment unit 20A. Here, the power adjustment unit 20A performs at least one of charging and discharging of the power at the first base. Further, the power adjustment unit 20A may include, for example, a storage battery that performs at least one of charging and discharging of the power at the first base.

[0100] Further, in the second embodiment, the control unit 80A may control the on or off of at least one of the first switch S3 and the second switch S1. Further, in the second embodiment, the control unit 80A may control the on or off of at least one of the third switch S2 and the switch S4. Also, in the second embodiment, the control unit 80A may appropriately control the on or off of the switch Sa. In FIG. 4, the illustration of the control line by which the control unit 80A controls the switch Sa is omitted.

[0101] As shown in FIG. 4, the first switch S3 may be connected between the second transformer 12A and the first transformer 14A. Therefore, the first switch S3 can turn on or off the path of the power that is transformed by the first transformer 14A and supplied to the second transformer unit 12A. The second switch S1 may be connected between the switch Sa and the second transformer 12A. Therefore, the second switch S1 can turn on or off the path of the power (which is the power generated by the power generation unit 10A) that is transformed by the second transformer 12A and flows reversely into the power grid. The third switch S2 may be connected between the connection point of the switch Sa and the second switch S1 and the fourth transformer 92A. Therefore, the third switch S2 can turn on or off the path of the power supplied from the power grid to the fourth transformer 92A. The switch S4 may be connected between the second transformer 12A and the third transformer 22A. Therefore, the switch S4 can turn on or off the path of the power discharged from the power conditioner 20A and transformed by the third transformer 22A, and the path of the power transformed by the third transformer 22A and charged into the power conditioner 20A. Since these switches may adopt the switches used in a conventional power control system or the like, a more detailed description is omitted.

[0102] Next, FIG. 5 for explaining the operation of the power control system 1A” according to the second embodiment shown in FIG. 4 is a flowchart for explaining the operation of the power control system 1A” according to the second embodiment.

[0103] When the operation shown in FIG. 5 starts, the control unit 80A of the power control system 1A” may determine whether the planned value (planned amount) of the power to be self-delivered from the power control system 1A’ is zero in step S21 (Determination 1). That is, in one embodiment, the control unit 80A may determine whether the plan for self-delivery is zero as Determination 1. Further, the control unit 80A may determine whether the amount of power generated by the power generation unit 10A is zero in step S21 (Determination 2). That is, in one embodiment, the control unit 80A may determine whether the photovoltaic power generation by the power generation unit 10A has stopped (for example, at night) as Determination 2.

[0104] In step S21, when at least one of the result of Determination 1 being zero and the result of Determination 2 being zero is satisfied, the control unit 80A performs the operation of step S23. That is, in step S21, when the result of Determination 1 is zero and / or the result of Determination 2 is zero, the control unit 80A performs the operation of step S23. On the other hand, in step S21, when the result of Determination 1 is not zero or the result of Determination 2 is not zero, the control unit 80A performs the operation of step S25.

[0105] In step S23, the control unit 80A controls to turn off the second switch S1. On the other hand, in step S25, the control unit 80A controls to turn on the second switch S1.

[0106] Thus, in the second embodiment, when the planned value (scheduled value) of the amount of power to be self-delivered from the power control system 1A” (the first site) becomes zero, the control unit 80A may control to turn off the second switch S1. In particular, when the planned value (scheduled value) of the amount of reverse power flow from the first site to the power grid becomes zero, the control unit 80A may also control to turn off the second switch S1. Also, in the second embodiment, when the amount of power generated by the power generation unit 10A becomes zero, the control unit 80A may control to turn off the second switch S1. In particular, when the PCS (power conditioner) that controls the power generation by the power generation unit 10A is stopped, the control unit 80A may also control to turn off the second switch S1. In the above cases, the control unit 80A may obtain the time information when the planned value of self-delivery becomes zero, and control to turn off the second switch S1 at the obtained time. On the other hand, when the planned value (scheduled value) of the amount of power to be self-delivered from the power control system 1A” (the first site) does not become zero, the control unit 80A may control to turn on the second switch S1. Also, when the power conditioner that controls the power generation by the power generation unit 10A is activated, the control unit 80A may control to turn on the second switch S1.

[0107] Also, when the amount of power generated by the power generation unit 10A becomes zero and the planned value (scheduled value) of the amount of power to be self-delivered from the first site does not become zero, the control unit 80A may control to turn off the first switch S3.

[0108] Also, when the PCS (power conditioner) that controls the power generation by the power generation unit 10A is stopped, the control unit 80A may control at least one of the second switch S1 and the first switch S3 to be turned off. On the other hand, when the power conditioner that controls the power generation by the power generation unit 10A is activated, the control unit 80A may control at least one of the second switch S1 and the first switch S3 to be turned on. Further, when it is predicted that the amount of power generated by the power generation unit 10A will become zero based on weather data including the solar radiation amount, etc., the control unit 80A may control the second switch S1 to be turned off during the time period when the amount of power becomes zero. Also, the control unit 80A may control the switch S4 to be turned off during the time when the charging and discharging operations of the power adjustment unit 20A are not expected. On the other hand, the control unit 80A may control the switch S4 to be turned on during the time when the charging and discharging operations of the power adjustment unit 20A are expected. That is, when the planned value of self-delivery is zero and the power generation of the power generation unit 10A has stopped, the switch S4 may be turned off. Also, the switch S4 may be controlled in conjunction with the first switch S3.

[0109] The power control system 1A” according to the second embodiment may perform control linked to the plan or operation of self-delivery when performing self-delivery by the power generation of the power generation unit 10 in the same manner as the power control system 1A’ according to the first embodiment. Specifically, when the planned value of self-delivery is zero, the power control system 1A” according to the second embodiment may turn off the second switch S1. Also, when the planned value of self-delivery is not zero, the power control system 1A” may turn on the second switch S1. Also, for example, when the power generation of the power generation unit 10 has stopped, such as at night, and the planned value of self-delivery is not zero, the control unit 80A may turn off the first switch S3. Therefore, according to the power control system 1A’, it is possible to reduce the loss by the transformer during the time period when power is not transmitted by self-delivery by the power generation of the power generation unit 10A.

[0110] In this way, also by the power control system 1A”, it is possible to reduce the loss due to the transformer in a time period when power transmission is not performed by self-delivery by the power generation of the power generation unit 10A. Further, the power control system 1A” according to the second embodiment may utilize the power charged in the power adjustment unit 20A for imbalance adjustment.

[0111] Also, in step S23 shown in FIG. 5, when the control unit 80A controls to turn off the first switch S3 and the second switch S1, the control unit 80A may turn off the third switch S2. The fourth transformer 92A may continuously generate losses if the third switch S2 is on even when the control unit 80A is not operating. Therefore, the power control system 1A” according to the second embodiment may perform control linked to the plan and / or operation of self-delivery when performing self-delivery by the power generation of the power generation unit 10. Specifically, the power control system 1A” according to the second embodiment may turn off the third switch S2 when the planned value of self-delivery is zero and when the power generation of the power generation unit 10A has stopped. Also, the power control system 1A” may turn on the third switch S2 when the planned value of self-delivery is not zero or when there is power generation in the power generation unit 10A. In this way, according to the power control system 1A”, it is possible to reduce the loss due to the transformer in a time period when there is no power transmission by self-delivery and the power generation of the power generation unit 10A has stopped. Here, even when it is necessary to keep the control unit 80A in a standby state, the standby power at that time is small. For this reason, the control unit 80A may be supplied with power from the power source 90. Also, when the control unit 80A is configured to include at least a part of any functional unit included in the power control system 1A shown in FIG. 1, the functional unit may turn on the third switch S2 during operation and turn off the third switch S2 when the functional unit is not operating.

[0112] The above-described embodiments have been described for implementation as systems such as the power control system 1A at the first base and the power control system 1B at the second base. However, the system according to an embodiment may include not only the power control system 1A at the first base and the power control system 1B at the second base, but also further include the power control system 1C at the third base, or may include more power control systems. In this case, for example, the simultaneous same amount calculation unit 60A may calculate the amount of power flowing backward from the first base to the power grid in a predetermined time period and supplied to a plurality of bases different from the first base based on the power demand at the first base and the amount of power generated by the power generation unit at the first base. Also, the output control unit 70A may perform 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 base to the power grid and supplied to a plurality of bases different from the first base based on the power demand.

[0113] Also, in one embodiment, the control unit 80A may perform control so as to reduce the difference between the planned and actual amounts of power supplied from the first base to the power grid and supplied to the second base different from the first base for each predetermined time period. In this case, for example, in the power control system 1A' according to the first embodiment described above, the first switch S1 may turn on or off the path of the power supplied from the first base to the power grid and supplied to the second base different from the first base. Also, in one embodiment, the control unit 80A may perform control so as to reduce the difference between the planned and actual amounts of power supplied from the first base to the power grid and supplied to a plurality of bases different from the first base for each predetermined time period. In this case, for example, in the power control system 1A' according to the first embodiment described above, the first switch S1 may turn on or off the path of the power supplied from the first base to the power grid and supplied to a plurality of bases different from the first base.

[0114] The above-described embodiment has been described assuming a mode in which the power generated by the power generation unit 10A at the first base is self-supplied to the load 30B at the second base. However, as described above, in one embodiment, the power generated by the power generation unit 10B at the second base may be self-supplied to the load 30A at the first base. In this case, the simultaneous same amount calculation unit 60B 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 70B may perform control so as to satisfy the power command by the electric utility 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.

[0115] In the above-described embodiment, 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.

[0116] Further, the above-described embodiment may be implemented, for example, as a control method for the above-described system or device. Further, the above-described embodiment may be implemented, for example, as a program executed in a computer of the above-described system or device. Furthermore, the above-described embodiment 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.

Explanation of Reference Numerals

[0117] 1 Power control system 10 Power generation unit 12, 14 Transformer 20 Power adjustment unit 22 Transformer 30 Load 32 Transformer 40 Smart Meter 50 Demand Calculation Unit 60 Simultaneous Quantity Calculation Unit 70 Output Control Unit 80 Control Unit 90 Power Supply 92 Transformer 200 Power Server 300 Wide - area Institution Server 400 Weather Server S1, S2, S3, S4, Sa, Sb Switches

Claims

1. A power generation unit that generates power at the first base, A first transformer that transforms the voltage of the power generated by the power generation unit, A first switch that turns on or off the path of the power that is transformed by the first transformer and flows backward into the power grid, A control unit that controls the power generation by the power generation unit and controls the on or off state of the first switch, A power source that can supply power charged from the power grid to the control unit, A second transformer that transforms the voltage of the power supplied from the power grid to the power source, A second switch that turns on or off the path of the power supplied from the power grid to the second transformer, Comprising: When the predicted value of the amount of power to be self-supplied from the first base becomes zero, the control unit controls to turn off the first switch, and when controlling to turn off the first switch, the control unit turns off the second switch. A power control system.

2. The power control system according to claim 1, wherein when the predicted value of the amount of power flowing backward from the first base into the power grid becomes zero, the control unit controls to turn off the first switch.

3. The power control system according to claim 1 or 2, wherein when the amount of power generated by the power generation unit becomes zero, the control unit controls to turn off the first switch.

4. The power control system according to any one of claims 1 to 3, wherein when the power conditioner that controls the power generation by the power generation unit stops, the control unit controls to turn off the first switch.

5. The power control system according to any one of claims 1 to 4, wherein when the power conditioner that controls the power generation by the power generation unit starts, the control unit controls to turn on the first switch.

6. The first switch turns on or off the path of the power that flows backward from the first base into the power grid and is supplied to a second base different from the first base. The power control system according to any one of claims 1 to 5.

7. The first switch turns on or off the path of the power that flows backward from the first base into the power grid and is supplied to a plurality of bases different from the first base. The power control system according to any one of claims 1 to 5.

8. A power generation unit that generates power at the first base, A first transformer that transforms the voltage of the power generated by the power generation unit, A second transformer that transforms the voltage of the power that is transformed by the first transformer and flows in reverse to the power grid; A first switch that turns on or off the path of the power that is transformed by the first transformer and supplied to the second transformer; A second switch that turns on or off the path of the power that is transformed by the second transformer and flows in reverse to the power grid; A power conditioner that performs at least one of charging and discharging power at the first site; A third transformer that transforms the voltage of the power for which at least one of charging and discharging is performed by the power conditioner; A control unit that controls the power generation by the power generation unit and at least one of charging and discharging of power by the power conditioner, and controls the on or off of the first switch and the second switch; Comprising; The control unit controls to turn off the second switch when the predicted value of the amount of power to be self-supplied from the first site becomes zero. A power control system.

9. The control unit controls to turn off the second switch when the amount of power generated by the power generation unit becomes zero. The power control system according to claim 8.

10. The control unit controls to turn on the second switch when the predicted value of the amount of power to be self-supplied from the first site does not become zero. The power control system according to claim 8 or 9.

11. The control unit controls to turn off the first switch when the amount of power generated by the power generation unit becomes zero and the predicted value of the amount of power to be self-supplied from the first site does not become zero. The power control system according to any one of claims 8 to 10.

12. A power source capable of supplying power charged from the power grid to the control unit; A fourth transformer that transforms the voltage of the power supplied from the power grid to the power source; A third switch that turns on or off the path of the power supplied from the power grid to the fourth transformer; Comprising; When the control unit controls to turn off the first switch and the second switch, the control unit turns off the third switch. The power control system according to any one of claims 8 to 11.

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