Power control device and power control method

Abstract

This invention provides a power control device and method that improves the utilization rate of solar power generation using a storage battery. [Solution] A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner (PCS), and charge command values ​​and discharge command values ​​to a storage battery. The power control device is configured to acquire generated power from the PCS, acquire charge / discharge status information from the storage battery, acquire a control schedule from a server, calculate the power generation command value, charge command value, and discharge command value by setting the power supplied to the power grid based on the control schedule to match the power to be controlled (generated power + discharge power - charge power) when the power to be controlled is (generated power + discharge power - charge power), and transmit the command values ​​to the PCS and / or storage battery. When the value of the potential power is greater than the power generation command value, the calculation is performed so that the power generation command value is made as large as possible within the range of the potential power value or less.

Description

Technical Field

[0001] The present invention relates to an apparatus and a method for controlling power of a power conditioner and a storage battery that constitute a photovoltaic power generation system.

Background Art

[0002] Conventionally, in photovoltaic power generation systems, surplus power is reversely flowed to a commercial power line (power system) and sold to a power company in accordance with a power purchase and sale contract with the power company. However, with the increase of distributed power sources such as photovoltaic power generation, the adverse effect of voltage fluctuation in the power system caused by reverse power flow has arisen.

[0003] In Japan, the Feed-in Premium (FIP) system has been introduced, and it has become necessary to select options such as selling the power quantity itself in the market (JEPX), supplying adjustment capacity for instantaneous supply-demand fluctuations to the market (supply-demand adjustment market), or consuming all power on-site (without performing reverse power flow to the power system). In addition, the operation of the capacity market for trading future power generation capacity has started, and it has also become necessary to determine future positions in advance. Note that participation in the market requires bearing the risk for the deviation (imbalance) between the planned value and the actual value. For this reason, various responses are being implemented, such as participating in market usage that requires advanced judgment on one's own responsibility, or entrusting tasks to an aggregator that undertakes market transactions and advanced operations on behalf of individual power generation business operators.

[0004] Here, as techniques for suppressing reverse power flow by utilizing a storage battery when supplying power from the power system and power from a solar cell to a load, for example, Patent Documents 1 and 2 are disclosed. Further, as a technique related to a power management apparatus that calculates an optimal planned power generation value, for example, Patent Document 3 is disclosed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] While Patent Documents 1 and 2 mentioned above can prevent reverse power flow, they do not control the power generated by the power conditioner itself, and further improvements are needed in this respect. Patent Document 3 mentioned above does not consider the use of a storage battery.

[0007] This invention has been made in view of the above circumstances and aims to provide a power control device and method that can flexibly respond to situations such as reverse power flow prohibition and reverse power flow (selling electricity) based on a control schedule determined by a server, etc., by using a battery together with a power conditioner. Furthermore, it aims to provide control to prevent efficient reverse power flow and control for more efficient use of solar power generation equipment. [Means for solving the problem]

[0008] A first aspect of the present invention relating to a power control device for solving the above problems is: A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively. The power generation acquisition step involves obtaining generated power from the power conditioner, A battery information acquisition step that obtains charge / discharge status information from the battery, The acquisition step involves obtaining the control schedule from the server, When the power to be controlled is calculated as (generated power + battery discharge power - battery charge power), the command value calculation step involves using the acquired information to calculate the generation command value, charge command value, and discharge command value by setting the power supplied to the power grid based on the control schedule to match the power to be controlled, and It is configured to perform a command value transmission step, which transmits only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or battery. When the potential power generated by a power conditioner is determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, the potential power generated by the power conditioner is defined as the potential power. If the potential power value is greater than the power generation command value, the command value calculation step calculates each command value so that the power generation command value is as large as possible within the range of the potential power value.

[0009] A second aspect of the present invention relating to a power control device for solving the above problems is: A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively. The power generation acquisition step involves obtaining generated power from the power conditioner, A battery information acquisition step that obtains charge / discharge status information from the battery, The acquisition step involves obtaining the control schedule from the server, A power consumption acquisition step to obtain the power consumption of the load, When the power to be controlled is calculated as (power generated + battery discharge power - battery charge power), the command value calculation step involves using the acquired information to calculate the power generation command value, charge command value, and discharge command value by setting the power supplied to the power system based on the control schedule to match (power to be controlled + load consumption), and It is configured to perform a command value transmission step, which transmits only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or battery. When the potential power generated by a power conditioner is determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, the potential power generated by the power conditioner is defined as the potential power. If the potential power value is greater than the power generation command value, the command value calculation step calculates each command value so that the power generation command value is as large as possible within the range of the potential power value.

[0010] A third aspect of the present invention relating to a power control device for solving the above problems is: A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively. The power generation acquisition step involves obtaining generated power from the power conditioner, A battery information acquisition step that obtains charge / discharge status information from the battery, A power consumption acquisition step to obtain the power consumption value of the load, When the power to be controlled is calculated as (generated power + battery discharge power - battery charge power), the command value calculation step involves using the acquired information to calculate the generation command value, charge command value, and discharge command value by setting the difference between the upper limit of the power to be controlled and the power consumption to be a function of the power consumption. The system is configured to perform a command value transmission step, which involves sending only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or battery.

[0011] In this way, by setting the difference between the upper limit and the power consumption as a function of the power consumption, using the above-mentioned controlled power, reverse power flow can be prevented more effectively.

[0012] A fourth aspect of the present invention relating to a power control device for solving the above problems is, in the third aspect described above, When the potential power generated by a power conditioner is determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, the potential power generated by the power conditioner is defined as the potential power. In the command value calculation step, the power generation command value, discharge command value, and charge command value can be calculated so that the power generation command value is as large as possible within a range less than or equal to the potential power value.

[0013] In the first to fourth aspects described above, the increase width of the power generation command value, the increase / decrease width of the charging command value, and the increase width of the discharge command value calculated in the command value calculation step can each be set to be equal to or less than a respective predetermined threshold value.

[0014] In the first to fourth aspects described above, the threshold for the increase width of the power generation command value can be set to a value of 10% or less of the rated power of the power conditioner, the threshold for the increase / decrease width of the charging command value can be set to a value of 10% or less of the maximum charging power of the storage battery, and the threshold for the increase width of the discharge command value can be set to a value of 10% or less of the rated output of the storage battery. However, these values are illustrative and not restrictive, and can be set as appropriate by the user.

[0015] In the first to fourth aspects described above, when the increase / decrease width of the charging command value and the increase / decrease width of the discharge command value calculated in the command value calculation step do not exceed the respective set lower limit values, the command values in the command value calculation step are discarded, or the command value transmission step after the command value calculation step is canceled, so as not to transmit the calculated charging command value and discharge command value.

[0016] In the first to fourth aspects described above, the lower limit value for the charging command value and the lower limit value for the discharge command value can be set to become smaller as the elapsed time from the previous transmission of the charging command value and the discharge command value becomes longer.

[0017] The first to fourth aspects described above can be configured to include a processor and a memory configured to execute each of the steps described above.

[0018] In the third or fourth aspect described above, when the difference between the power consumption and the upper limit value of the controlled power is defined as the purchased power target value, In the command value calculation step, the power generation command value, the discharge command value, and the charging command value can be calculated such that the power generation command value is equal to or less than the latent power value, and the value of the power purchased from the commercial power source is equal to or greater than the purchased power target value and is minimized as much as possible.

[0019] In the third or fourth embodiment described above, the command value calculation step is performed when the value of purchased electricity is equal to the target value of purchased electricity and the value of potential power is greater than the generation command value. In the command value calculation step, each command value can be calculated in such a way that the value of purchased electricity is kept equal to the target value of purchased electricity, while the generation command value is made as large as possible within a range less than or equal to the value of potential power.

[0020] In the third or fourth embodiment described above, in the command value calculation step, if the value of purchased electricity is greater than the target value of purchased electricity, and the value of potential electricity is greater than the generation command value, Each command value can be calculated such that the value of purchased electricity equals the target value of purchased electricity, and the generation command value is as large as possible within the range of the potential power value.

[0021] In the third or fourth embodiment described above, in the command value calculation step, if the value of purchased electricity is greater than the target value of purchased electricity, and the value of potential electricity is equal to the generation command value, The discharge power of the battery and / or the charging power of the battery can be increased and / or the command value can be decreased so that the value of purchased electricity is equal to or greater than the target value and as small as possible.

[0022] In the third or fourth embodiment described above, in the command value calculation step, if the value of purchased electricity is smaller than the target value of purchased electricity, A discharge command value or charge command value can be calculated to decrease the discharge power of the battery and / or increase the charge power of the battery so that the target value of electricity purchased and the value of electricity purchased become equal.

[0023] In the third or fourth embodiment described above, in the command value calculation step, if there is no remaining charge capacity for the battery, It is possible to reduce the generated power and calculate each command value so that the target value for purchased electricity equals the value of purchased electricity.

[0024] In the third or fourth embodiment described above, the function may be a linear function.

[0025] The present invention relates to a system for solving the above problems and comprises a power control device according to any one of the first to fourth embodiments described above, a power conditioner, a storage battery, and a solar cell connected to the power conditioner.

[0026] A first aspect of the present invention relating to a method is: A method executed by a power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively, The power generation acquisition step involves obtaining generated power from the power conditioner, A battery information acquisition step that obtains charge / discharge status information from the battery, The acquisition step involves obtaining the control schedule from the server, When the power to be controlled is calculated as (generated power + battery discharge power - battery charge power), the command value calculation step involves using the acquired information to calculate the generation command value, charge command value, and discharge command value by setting the power supplied to the power grid based on the control schedule to match the power to be controlled, and The system includes a command value transmission step which transmits only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or battery, When the potential power generated by a power conditioner is determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, the potential power generated by the power conditioner is defined as the potential power. In the command value calculation step, the power generation command value, discharge command value, and charge command value are calculated so that the power generation command value is as large as possible within a range less than or equal to the potential power value.

[0027] A third aspect of the present invention relating to a power control device is as follows when the storage battery cannot be used for any reason (malfunction, lack of charging or discharging capacity) or when there is no storage battery. A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, The power generation acquisition step involves obtaining generated power from the power conditioner, A power consumption acquisition step to obtain the power consumption value of the load, A command value calculation step involves using the acquired information to calculate a power generation command value by setting the difference between the upper limit of power generation and power consumption to be a function of power consumption, and The system is configured to perform a command value transmission step, which involves transmitting the calculated power generation command value only if there is a change in the calculated power generation command value. When the difference between power consumption and the upper limit of power generation is set as the target value for electricity purchase, and the potential power generation of the power conditioner, which can be determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, is set as the potential power generation, In the command value calculation step, the power generation command value is calculated such that the value of electricity purchased from the commercial power source is equal to the target purchase value, and the power generation command value is less than or equal to the potential power value. In either case, if the generated power is too low compared to the power consumed, the value of purchased electricity may exceed the target value for purchased electricity.

[0028] The first, second, and fourth embodiments all share the following characteristics: they include a step of acquiring various information, and when the potential power generated by the power conditioner is determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, if the value of the potential power is greater than the power generation command value, the command value calculation step calculates each command value so that the power generation command value is as large as possible within a range less than or equal to the value of the potential power. [Effects of the Invention]

[0029] According to the present invention, by controlling the power of both a power generation device such as a solar cell and a storage battery through commands from a power control device, it becomes possible to utilize the power grid in accordance with the contract (selling and buying electricity). Furthermore, it is possible to improve the utilization rate of solar cells and to provide a power control device, power control system, and power control method that can reduce the load on the storage battery and power conditioner. [Brief explanation of the drawing]

[0030] [Figure 1] Figure 1 is a block diagram showing a power control system according to the first embodiment of the present invention. [Figure 2] Figure 2 is a block diagram showing a modified example of the power control system according to the first embodiment of the present invention. [Figure 3] Figure 3 is a flowchart showing the basic method (program) executed by the power control device according to the first embodiment of the present invention. [Figure 4] Figure 4 is a flowchart showing a modified example of a basic method (program) executed by a power control device according to the first embodiment of the present invention. [Figure 5] Figure 5 is a flowchart showing a further method (program) to be performed in the power control device according to the first embodiment of the present invention. [Figure 6] Figure 6 is a block diagram showing a power control system according to a second embodiment of the present invention. [Figure 7] Figure 7 is a flowchart showing the basic method (program) executed by the power control device according to the second embodiment of the present invention. [Figure 8] Figure 8 is a flowchart showing the basic method (program) executed by the power control device according to the third embodiment of the present invention. [Figure 9] Figure 9 is a flowchart of a power control program according to a fourth embodiment of the present invention. [Figure 10] Figure 10 is a flowchart of a power control program according to a fifth embodiment of the present invention. [Figure 11]Figure 11 is a flowchart of a power control program according to the sixth embodiment of the present invention. [Modes for carrying out the invention]

[0031] (First embodiment) In this embodiment, electricity generated by solar cells can be fed back into the power grid (sold) using a system such as the FIP (Feed-in Premium) scheme, and the case where there is no load will be explained as an example. Here, the explanation will be based on practical examples in Japan, but this content may be modified as appropriate to the system design in each country. In Japan, a contract (power purchase contract) can be concluded to supply a predetermined amount of electricity to the power grid (reverse power flow) during a predetermined time period (in 30-minute increments). Note that solar cells are an example, and other power generation devices may also be used.

[0032] As shown in Figure 1, an example configuration of the power control system 100 according to the first embodiment includes a power control device 40, a PCS (power conditioner) 20 and a storage battery 30 whose output (upper limit) of generated power is controlled by the power control device 40, and a solar cell (photovoltaic power generation device) 10 connected to the PCS 20. Furthermore, a power receiving and transforming unit 50 connected to a commercial power source (power grid) 70, a server 90 for formulating a control schedule, etc., are connected to the power control system 100. It is also preferable that the power control device 40 is configured to be connectable to a terminal for changing the settings of the power control device 40.

[0033] The electricity generated by the solar cell 10 is fed back to the commercial power supply 70 via the PCS 20 and is also used to charge the battery 30. The battery 30 can be charged by purchasing electricity from the commercial power supply 70 (it can also operate as a power grid battery), and the electricity stored in the battery 30 can be fed back to the commercial power supply 70 via the PCS 20.

[0034] Furthermore, as shown in the modified example in Figure 2, the power control system 150 may include a hybrid power conditioner in which the PCS 20 manages the power of both the battery 30 and the solar cell 10. In Figure 2, the power control device 40 may control the charging and discharging of the battery 30 via the PCS 20.

[0035] The power control device 40 transmits a power generation command value, which is the upper limit of the generated power, to the PCS 20, and charge command values ​​and discharge command values ​​to the storage battery, respectively. The power control device 40 also executes a power control program, which will be described later, and includes the necessary devices for this purpose, such as a processing unit such as a processor, a storage device such as memory or an SSD (temporary and / or non-temporary), a communication device (wired and / or wireless), and an input device. Known devices can be used for each of these devices, and integrated components such as a microcontroller or a System on Chip may also be used.

[0036] Referring to Figure 3, the operation flow of the power control program according to the first embodiment will be further explained. Here, the case where there is reverse power flow to the power grid (selling electricity) will be explained. When there is no reverse power flow (not selling electricity), the power generated by the solar cells is used to charge the storage battery 30, and / or the storage battery 30 is charged by purchasing electricity during times when the unit price of electricity is low, or charging is stopped after the upper limit of SOC (STATE OF CHARGE) is reached.Hereafter, the power control device 40 will be referred to as the subject, but the devices that perform each process are the processing device and the memory device, and information can be exchanged via a communication device.First, the power control device 40 acquires the generated power from the PCS 20 (generated power acquisition step S11).

[0037] The power control device 40 acquires charge / discharge status information from the battery 30 (battery information acquisition step S12).

[0038] This information may be measured by a measuring device provided in the power control device 40, measured by the PCS 20, battery 30, etc. and transmitted to the power control device 40, obtained indirectly, or calculated from some of the acquired information.

[0039] The power control device 40 obtains the control schedule from the server 90 (control schedule acquisition step S13). The plan may be obtained directly from the server 90 that formulates the control schedule, or it may be obtained via another device.

[0040] The power control device 40 uses the acquired information to calculate the power to be controlled, which is calculated as (the generated power + the discharge power of the battery - the charging power of the battery), so that it is equal to the power supplied to the power system based on the control schedule, and calculates the power generation command value, the charging command value, and the discharge command value (command value calculation step S14).

[0041] A control schedule refers to time-series information formulated by Server 90, etc., for controlling PCS20, etc., for a specific period, such as a time-series representation of the planned power supply to the power grid. For example, when buying and selling electricity within 30-minute intervals on JEPX, this could include a reverse power flow schedule for a specific period that reflects the amount of electricity supplied. The control schedule can be revised to compensate for situations such as a decrease in solar power generation causing the amount of electricity supplied up to the present time (Wh) within a 30-minute interval to fall below the planned value. However, this can be formulated by Server 90, etc., and the method of formulation is not within the scope of this invention. Furthermore, the power supplied to the power grid based on the control schedule (W) is the power supply planned to be supplied to the power grid at the present time according to the control schedule. In the case of adjustment power supplied by the supply and demand adjustment market, this can be interpreted as the period for supplying the adjustment power and the adjusted power supply.

[0042] The power control device 40 transmits only the command value that has been changed, if any of the calculated command values ​​has been changed (command value transmission step S15). Alternatively, the command value transmission step S15 may transmit all of the calculated command values, or a combination of these may be used (for example, all of the calculated command values ​​may be transmitted at periodic transmission timings, and only the command value that has been changed may be transmitted at other timings).

[0043] Basically, steps S11 to S15 are repeated, and the order of steps S11 to S13 is not particularly limited. For example, as shown in Figure 4, the power generation plan acquisition step S21, the battery information acquisition step S22, and the control schedule acquisition step S23 may be performed simultaneously and in parallel, and repeated at predetermined intervals (e.g., 6 seconds) using a timer or the like. The predetermined interval may differ for each step.

[0044] (Methods for improving efficiency) The method for calculating a command value with high utilization efficiency of a solar cell according to an embodiment of the present invention (specific processing in command value calculation step S14) will be explained. This improvement in the utilization efficiency of the solar cell is one of the characteristic components of this embodiment. The potential power generation of the power conditioner is determined from the solar radiation intensity (which fluctuates depending on the season, time of day, weather, etc., and is determined by measuring it using a measuring device), the panel capacity of the solar cell connected to the power conditioner (PCS), and the rated capacity of the power conditioner, and this is called the potential power generation power. In this case, in the command value calculation step, the power generation command value, discharge command value, and charge command value are calculated so that the power generation command value is less than or equal to the value of the potential power. Here, the relationship PCS rated power ≥ potential power ≥ power generation command value always holds.

[0045] Potential power can be calculated, for example, as follows. However, the following is just one example of a method for calculating potential power, and other methods can also be used. Such calculations of potential power may be performed whenever necessary, or may be performed in advance, such as for power generation forecasts, or these may be used in combination as appropriate. In addition, solar radiation intensity and panel temperature may be measured using measuring devices, and if measurement is not possible, the correction value below can be set to 1 (no correction), or a correction value calculated based on power generation results can be used to calculate the potential power. The smaller of (A) and (B) below is defined as the latent power. (A) Rated output power value of the power conditioner (B) The value obtained by multiplying the rated output (panel capacity) of the solar cell connected to the power conditioner by a correction value.

[0046] The rated output of the solar panel is based on a panel temperature of 25°C and a solar irradiance of 1.0 kW / m². 2 This is the power generated in that case. The correction value is a correction value for the power generation efficiency of the solar cell (panel), calculated based on the measured solar radiation intensity and panel temperature, or based on power generation performance. Due to factors such as degradation of solar panels and shading, it may not be possible to generate power as calculated from the measured values, and the actual power generated may be less than the potential power. The correction value may prioritize one calculated from, for example, the measured solar radiation intensity and panel temperature. If the difference between potential power and actual generated power exceeds a predetermined threshold for a predetermined period of time or longer, a correction value calculated based on actual power generation performance may be used. The predetermined threshold for the difference can be set as appropriate, for example, 5% or 10% of the potential power. The predetermined time can also be set as appropriate, for example, 10 minutes or 30 minutes.

[0047] While it is possible that the PCS20 may generate less power than the power generation command value due to weather conditions, it is practically impossible to increase the power generated above the potential power. Therefore, the relationship between potential power and the power generation command value is used as an indicator to determine the potential for further utilization of solar cells. This control flow will be explained with reference to Figure 5.

[0048] The system determines whether the value of the potential power is less than or equal to the power generation command value (S31). If the value of the potential power is greater than the power generation command value (No in S31), the system performs processes to reduce discharge from the battery (S32-S33) and / or processes to increase charging to the battery (S36-S37).

[0049] Specifically, the system determines whether the battery is in a discharge state (discharge state) (S32). If it is in a discharge state (Yes in S32), the system adjusts the potential power value to equal the power generation command value, and reduces the discharge command value by the fluctuation range δ of the power generation command value (discharge command value - δ) (S33).

[0050] S34 determines whether the discharge command value in S33 is a negative value. If it is not a negative value, the process proceeds to the command value transmission step S55. If the discharge command value in S33 is a negative value, the discharge command value is set to 0kW, and the difference γ(δ-ε) between the fluctuation range ε ​​of the discharge command value and the fluctuation range δ of the power generation command value is set as the charge command value. After this, the process proceeds to the command value transmission step S55.

[0051] Furthermore, if the battery is not in a discharge state (No in S32), it is determined whether or not there is remaining charging capacity in the battery (S36). If there is remaining charging capacity (Yes in S36), the largest possible charging command value is calculated within the range where the value of purchased electricity = the target value of purchased electricity and the value of potential power ≥ the generation command value, and a generation command value that is a trade-off with this is calculated (S37).

[0052] In this flow as well, a step similar to that in S36 may be performed after S34, as described above. Alternatively, instead of switching from one discharge state to another, a power generation command value may be calculated in S33 such that the discharge command value and the charge command value are set to 0kW, and the control of the charging power may be performed in the next cycle.

[0053] Furthermore, in this flow, if the potential power value is less than or equal to the power generation command value (Yes in S31), or if the battery is not in a discharged state (No in S32) and there is no remaining charging capacity for the battery (No in S36), no command value is calculated. This is because the optimal balance between power generation and charging / discharging has already been ensured.

[0054] By doing so, it becomes possible to perform control that makes maximum use of the generated power.

[0055] Furthermore, if the charging state continues, a step may be provided to determine whether the SOC is approaching the upper limit, and if the SOC is approaching the upper limit, the charging power may be reduced (gradually or continuously). Similarly, if the discharging state continues, a step may be provided to determine whether the SOC is approaching the lower limit, and if the SOC is approaching the lower limit, the discharge power may be reduced (gradually or continuously). The operational upper and lower limits of the SOC may be values ​​specified by the manufacturer (rated values), but lower operational upper limits and higher operational lower limits may be adopted to extend the charge-discharge cycle life.

[0056] In this embodiment, during periods when reverse power flow is prohibited (no electricity is sold), fluctuations in the solar panel's power generation may be managed by tracking the charging power. Alternatively, control may be implemented to prevent reverse power flow, such as by disconnecting the system from the power grid.

[0057] (Second embodiment) In this embodiment, a case in which the first embodiment further includes a load 60 will be described. The configuration example of the power control system 200 according to the present invention is the same as in Figure 1, except that it further includes a load 60 as shown in Figure 6 and is capable of selling electricity to the load 60 (reverse power flow), and a description of the same configuration will be omitted. In addition, the details of the control flow described below will also be omitted, as they are the same as in the first embodiment and so on.

[0058] Referring to Figure 7, the operation flow of the common power control program according to this embodiment will be further explained. Here, we will explain the case where there is reverse power flow to the power grid. The power control device 40 acquires generated power from the PCS 20 (power generation acquisition step S41).

[0059] The power control device 40 acquires charge / discharge status information from the battery 30 (battery information acquisition step S42).

[0060] The power control device 40 obtains a control schedule from the server 90 or the like (control schedule acquisition step S43).

[0061] The power control device 40 obtains the value of the power consumption of the load 60 (power consumption acquisition step S43).

[0062] This information may be measured by a measuring device provided in the power control device 40, measured by the PCS 20, battery 30, etc. and transmitted to the power control device 40, or obtained by calculating other information from some of the information. For example, the power consumption value of the load 60 may be obtained directly from the load 60 using a power meter, etc., or indirectly, or calculated using the PCS output, power sold / purchased, charge / discharge power values, etc., or by other means.

[0063] The power control device 40 uses the acquired information to calculate the power to be controlled, which is calculated as (the generated power + the discharge power of the battery - the charging power of the battery), so that it is equal to (the power supplied to the power system based on the control schedule + the power consumed by the load), and calculates the power generation command value, the charging command value, and the discharge command value (command value calculation step S45).

[0064] The power control device 40 transmits only the command value that has been changed, if any of the calculated command values ​​has been changed (command value transmission step S46). Alternatively, the command value transmission step S45 may transmit all of the calculated command values, or a combination of these may be used (for example, all of the calculated command values ​​may be transmitted at periodic transmission timings, and only the command value that has been changed may be transmitted at other timings).

[0065] Basically, steps S41 to S46 are repeated, and the order of steps S41 to S44 is not particularly limited. For example, the power generation plan acquisition step, the battery information acquisition step, and the control schedule acquisition step may be performed simultaneously and in parallel, and at predetermined intervals (e.g., 6 seconds). The predetermined interval may differ for each step.

[0066] In this embodiment as well, the efficiency improvement method (S31 to S37 in Figure 5) can be applied in the same manner as in the first embodiment.

[0067] (Third embodiment) In this embodiment, we will describe an example where, in the second embodiment, reverse power flow to the power grid (commercial power supply) is not possible (or not performed at all). The system configuration is the same as in the second embodiment, except that the server 90 is not required in a system where no reverse power flow is performed, and therefore its description will be omitted.

[0068] Referring to Figure 8, the operation flow of a common power control program according to a third embodiment of the present invention will be further described. The power control device 40 acquires generated power from the PCS 20 (power generation acquisition step S51).

[0069] The power control device 40 acquires charge / discharge status information from the battery 30 (battery information acquisition step S52).

[0070] The power control device 40 obtains the value of the power consumption of the load 60 (power consumption acquisition step S53).

[0071] The power control device 40 uses the acquired information to calculate the power generation command value, the charging command value, and the discharge command value (command value calculation step S54) by setting the difference between the upper limit of the power to be controlled (calculated as (generated power + battery discharge power - battery charging power)) and the power consumption to be a function of the power consumption. The upper limit of the power to be controlled is set so that if the power consumption is greater than 0, the upper limit > power consumption to prevent reverse power flow (if the power consumption is 0, the upper limit = power consumption).

[0072] The power control device 40 transmits only the command value that has been changed, if any of the calculated command values ​​has been changed (command value transmission step S55). Alternatively, the command value transmission step S55 may transmit all of the calculated command values, or a combination of these may be used (for example, all of the calculated command values ​​may be transmitted at periodic transmission timings, and only the command value that has been changed may be transmitted at other timings).

[0073] In this embodiment, instead of an upper limit on the generated power, the upper limit on the controlled power, which takes into account the influence of the storage battery on the generated power, is set so that the difference between this upper limit and the power consumption is a function of the power consumption. This is because, in order to prevent reverse power flow, it is preferable to control these power values, which are difficult to change rapidly.

[0074] The process in command value calculation step S54 will be explained using an example where the difference between the upper limit of the controlled power and the power consumption is a linear function of the power consumption. The linear function is merely an example of a function; it is sufficient if it is a broadly defined monotonically increasing function (non-decreasing function) that is linear, nonlinear, or discontinuous, at least within the range of the expected power consumption.

[0075] The operation of the power control device 40 described above will be described using an example of performing control such that the difference between the upper limit value of the power to be controlled and the power consumption is a linear function of the power consumption. Let P be the power consumption and S be the upper limit value of the power to be controlled, the relationship is expressed by the following equation. P−S=a×P+b (where a and b are constants satisfying 0<a<1 and 0<b)

[0076] When this equation is rearranged, the following is obtained. S=(1−a)×P−b

[0077] For example, assuming that the PCS rated power is 500 kW, the power consumption of the load is 500 kW, a is 0.1, and b is 25 kW (5% of the PCS rated power), S is 425 kW, which is a value smaller than the PCS rated power. In this case, the power generation command value and / or the charging command value are calculated (the discharge command value is 0 kW) such that S (power generation command value − charging command value) is 425 kW, to prevent occurrence of reverse power flow. When the SOC of the storage battery 30 has reached the upper limit value, the charging command value is 0 kW, and when the maximum charging power is reached, the calculation (change) of the charging command value is not performed, and only the calculation of the power generation command value is performed. Further, as the SOC approaches the upper limit value, control may be performed such that the charging power is gradually reduced (approaches 0 kW) (the charging command value is decreased and changed).

[0078] After this, when the power consumption of the load increases to 550 kW, S becomes 470 kW, and the upper limit value S of the power to be controlled is increased by 45 kW by increasing the power generation command value and / or decreasing the charging command value.

[0079] If the load's power consumption increases further to 600kW, S becomes 515kW, and the upper limit S of the controlled power exceeds the PCS rated power. In this case, the power generation command value is set to the maximum (PCS rated power), the charge command value is set to 0kW, and the discharge command value is increased. If the SOC of the battery 30 has reached the lower limit, the discharge command value is 0kW, and if the rated output has been reached, the discharge command value is not calculated (changed). Alternatively, the discharge power may be controlled to gradually decrease (approach 0kW) as the SOC approaches the lower limit (decreasing or changing the discharge command value).

[0080] Furthermore, if the load's power consumption decreases from 500kW to 450kW, S = 380kW. In this case, the power generation command value and / or the charging command value are calculated so that S(power generation command value - charging command value) = 380kW.

[0081] A more efficient method for calculating command values ​​is explained below. The potential power generated by the power conditioner is determined from solar radiation intensity (which fluctuates depending on the season, time of day, weather, etc., and is determined by measuring it using a measuring device), the panel capacity of the solar cells connected to the power conditioner (PCS), and the rated capacity of the power conditioner. The difference between the upper limit of the power to be controlled and the power consumption is set as the target power purchase value. In this command value calculation step, the generation command value, discharge command value, and charge command value are calculated so that the generation command value is less than or equal to the potential power value, and the value of the power purchased from the commercial power source is equal to the target power purchase value. Here, the relationship PCS rated power ≥ potential power ≥ generation command value always holds.

[0082] If the PCS20 generates power equal to the generation command value, and the battery discharges power equal to the discharge command value or charges power equal to the charge command value, the value of electricity purchased from the commercial power source will be equal to the target purchase value. However, this can occur if the PCS20 generates less power than the generation command value due to weather conditions or other factors.

[0083] If the value of purchased electricity > the target value of purchased electricity, it is considered that the purchased electricity is more than expected, and that further effective use of solar panels and storage batteries is possible. On the other hand, if the value of purchased electricity < the target value of purchased electricity, it is considered that the purchased electricity is less than expected, and reverse power flow is more likely to occur when the power consumption of the load decreases rapidly. By calculating the generation command value, discharge command value, and charge command value so that the value of purchased electricity is equal to the target value of purchased electricity (so that the value of purchased electricity is greater than or equal to the target value of purchased electricity and as small as possible), it is possible to achieve a higher level of balance between further effective use of solar panels and storage batteries and prevention of reverse power flow.

[0084] (Fourth embodiment) In the third embodiment, the fourth embodiment adopts the efficiency improvement method described in the first embodiment, and the control differs depending on whether or not electricity is purchased, as follows. This control will be explained with reference to Figure 9. Figure 9 is a flowchart showing the efficiency improvement method of the power control device according to the fourth embodiment of the present invention.

[0085] (If the value of purchased electricity > the target value of purchased electricity, S61~S69) If the target electricity purchase value is less than the purchased electricity value (Yes in S61), it is determined whether the potential power value is greater than the generation command value (whether further utilization of solar cells is possible) (S62). If the potential power value is greater than the generation command value (No in S62), the largest possible generation command value is calculated (the generation command value is increased or decreased) within the range where the purchased electricity value ≥ the target electricity purchase value and the potential power ≥ the generation command value (S63).

[0086] After calculating the power generation command value, it is determined whether the predicted power purchased (predicted power purchased) value, assuming the PCS generates power at this power generation command value, is still greater than the power purchase target value (S64). If the predicted power purchased value is greater than the power purchase target value (Yes in S64), the process to reduce charging to the battery (S65-66) and / or to increase discharge from the battery (S68-69) is performed, similar to when the potential power value is less than or equal to the power generation command value (Yes in S62). If the power purchased value is equal to the power purchase target value (No in S64), the process proceeds to the command value transmission step.

[0087] Specifically, the system determines whether the battery is charging (in a charging state) (S65). If it is charging (Yes in S65), and the potential power value is greater than the power generation command value (No in S62), the system calculates a charging command value (reduces or changes the charging command value) such that the purchased power value ≥ the target power purchase value and the purchased power value is minimized (S66).

[0088] After S66, it is determined whether the charging power has become 0, and whether the predicted power purchase value, assuming charging with this command value, is greater than the target power purchase value (S67). If the answer in S67 is No, this process ends and the process proceeds to the command value transmission step S55.

[0089] Furthermore, if the charging power is 0 and the predicted power purchase value is greater than the target power purchase value (Yes in S67), the system determines whether there is remaining discharge capacity in the battery, similar to the case where the battery is not charging (No in S65) (S68). If there is remaining discharge capacity (Yes in S68), the system calculates the largest possible discharge command value (increase or change the discharge command value) within the range where the power purchase value is greater than or equal to the target power purchase value (S69). Here, having remaining discharge capacity means that the battery's SOC is greater than the lower limit and the current discharge power (output power) is less than the battery's rated output power. The largest possible discharge command value is within the range of the battery's rated output value. The lower limit of SOC can be changed as appropriate depending on the battery's capacity and degradation prevention level, and can be set to any value in the range of 0-10% of the battery's capacity (for example, 5%).

[0090] In this flow, the step S68 for determining the remaining discharge capacity is not performed after changing the charging power to 0kW (S66, S67). This is because the fact that charging was performed can be determined as having remaining discharge capacity. However, S68 may be performed after S67. Alternatively, the process may be modified so that the switch from the charging state to the discharging state is stopped, and the process proceeds to the command value transmission step S55 after the charging power becomes 0, and the control of the discharge power is performed next time.

[0091] Furthermore, in this flow, if the potential power value is less than or equal to the power generation command value (Yes in S62), and the battery is not in a charged state (No in S65), and there is no remaining discharge capacity in the battery (No in S67), then no command value is calculated. In other words, electricity purchases will continue to exceed the target purchase value.

[0092] (If the value of purchased electricity is less than the target value of purchased electricity, then S71~S78) If the target value for electricity purchase is greater than the value of electricity purchased (Yes in S71), the system performs processes to reduce discharge from the battery (S72-73) and / or processes to increase charging to the battery (S75-76).

[0093] Specifically, the system determines whether the battery is in a discharge state (discharge state) (S72), and if it is in a discharge state (Yes in S72), it calculates the smallest possible discharge command value (reduces / changes the discharge command value) within the range where the value of purchased power is ≤ the target value of purchased power (S73).

[0094] After S73, it is determined whether the discharge power has become 0kW and whether the predicted power purchase value, assuming charging with this command value, is smaller than the target power purchase value (S74). If the answer in S74 is No, this process ends and the process proceeds to the command value transmission step S55.

[0095] Furthermore, if the discharge power = 0 and the predicted power purchase value < the target power purchase value (Yes in S74), the system determines whether there is remaining charge capacity in the battery, similar to the case where there is no discharge (No in S72) (S75). If there is remaining charge capacity (Yes in S75), the system calculates the largest possible charge command value (increase or change the charge command value) within the range where the power purchase value ≤ the target power purchase value (S76). Here, having remaining charge capacity means that the battery's SOC is less than the upper limit and the current charge power is less than the battery's maximum charge power. The upper limit of SOC can be changed as appropriate depending on the battery capacity and degradation prevention level, and can be set to any value in the range of 90-100% of the battery capacity (for example, 95%). The largest possible charge command value is within the range of the battery's maximum charge power value.

[0096] After S76, it is determined whether the predicted power purchase value, assuming charging with this command value, is smaller than the target power purchase value (S77). If the predicted power purchase value is smaller than the target power purchase value (Yes in S77), the power generation command value is calculated so that the power purchase value equals the target power purchase value, similar to the case where there is no charging capacity (No in S75) (S78). If the predicted power purchase value is equal to or greater than the target power purchase value (No in S77), this process is completed and the process moves to the command value transmission step S55.

[0097] In this flow, step S75, which determines the remaining charging capacity, is not performed after changing the discharge power to 0kW (S72, S73). This is because the fact that discharge was performed can be determined as having remaining charging capacity. However, S75 may be performed after S74. Alternatively, the process may be modified to stop switching from one discharge state to another, and proceed to S78 only after the discharge power becomes 0kW, with the control of the charging power being performed in the next step.

[0098] (If the value of purchased electricity equals the target value of purchased electricity, S81~S87) If the value of purchased electricity equals the target value of purchased electricity (No in S61 and No in S71), the basic operation is the same as in Figure 5. It is determined whether the value of potential power is greater than the generation command value (S81). If the value of potential power is greater than the generation command value, processing is performed to reduce discharge from the storage battery (S82-83) and / or to increase charging to the storage battery (S86-87).

[0099] Specifically, the system determines whether the battery is in a discharge state (discharge state) (S82). If it is in a discharge state (Yes in S82), the system adjusts the potential power value to match the power generation command value, and reduces the discharge command value by the fluctuation range δ of the power generation command value (discharge command value - δ) (S83).

[0100] S84 determines whether the discharge command value in S83 is a negative value. If it is not a negative value, the process proceeds to the command value transmission step S55. If the discharge command value in S83 is a negative value, the discharge command value is set to 0kW, and the difference γ(δ-ε) between the fluctuation range ε ​​of the discharge command value and the fluctuation range δ of the power generation command value is set as the charge command value. After this, the process proceeds to the command value transmission step S55.

[0101] Furthermore, if the battery is not in a discharge state (No in S82), it is determined whether or not there is remaining charging capacity in the battery (S86). If there is remaining charging capacity (Yes in S86), the largest possible charging command value is calculated within the range where the value of purchased power = the target value of purchased power and the value of potential power ≥ the generation command value, and a generation command value that is a trade-off with this is calculated (S87).

[0102] In this flow as well, a step similar to that in S86 may be performed after S84, as described above. Alternatively, instead of switching from one discharge state to another, a power generation command value may be calculated in S83 such that the discharge command value and the charge command value are set to 0kW, and the control of the charging power may be performed in the next step.

[0103] Furthermore, in this flow, if the potential power value is less than or equal to the power generation command value (Yes in S81), or if the battery is not in a discharged state (No in S82), and there is no remaining charging capacity in the battery (No in S86), no command value is calculated. This is because the optimal balance between power generation and charging / discharging has already been ensured.

[0104] In this way, by achieving the purchase power value equal to the purchase target value through steps S61-S69 and S71-S78, and then moving on to optimization for the case where the purchase power value equals the purchase target value (S81-S87), it becomes possible to perform control that simultaneously achieves the maximum utilization of generated power and the prevention of reverse power flow.

[0105] Furthermore, if the charging state continues, a step may be provided to determine whether the SOC is approaching the upper limit, and if the SOC is approaching the upper limit, the charging power may be reduced. Similarly, if the discharging state continues, a step may be provided to determine whether the SOC is approaching the lower limit, and if the SOC is approaching the lower limit, the discharge power may be reduced.

[0106] (Fifth embodiment) In the fifth embodiment, a modified version of the command value calculation method is described in which the load on both the battery and the power conditioner is reduced. Only the specific processing of the command value calculation step by the power control device is modified, and the system configuration remains unchanged.

[0107] When acquiring power consumption, charge / discharge status, and generated power in real time and transmitting command values, large changes in the command values ​​increase the load on the controlled power conditioner and battery, and the number of command value changes tends to increase if recurring fluctuations occur. In particular, increases in the generated command value, increases / decreases in the charged command value, and increases in the discharge command value have a significant impact on the power conditioner and battery. Therefore, the load can be reduced by adopting a method that restricts the range of change in these command values ​​to below predetermined thresholds. Note that the decreases in the generated command value and the decreases in the discharge command value may or may not be restricted to below predetermined thresholds.

[0108] Figure 10 is a flowchart of a power control program according to a fifth embodiment of the present invention. Here, we will explain using the case where the flow shown in Figure 9 is performed as the command value calculation step. First, the command value with the largest fluctuation range is calculated as a provisional command value for the power generation command value in S63 (S91). After this, it is determined whether the fluctuation range of the calculated command value (the absolute value of the difference between the previous command value and the current command value) exceeds a threshold for the command value (for example, the power generation command value in S63) (S92). Note that when trade-off command values ​​are calculated simultaneously, as in S83 and S85, if at least one of them exceeds the threshold, it is determined that the threshold is exceeded (Yes in S92), and only if both are below the threshold is it determined that the threshold is not exceeded (No in S92).

[0109] If the threshold is exceeded (Yes in S92), a command value is calculated (S93) for this command value only (the power generation command value in S63) such that the threshold equals the fluctuation range. After this, the process moves to the next step (for example, S64). This type of processing is also performed in S66 and S68, with the target command value being changed as appropriate.

[0110] The threshold for the increase in the power generation command value can be set as appropriate. The initial (default) threshold can be set to a value of 10% or less of the power conditioner's rated power, the threshold for the increase or decrease in the charge command value can be set to a value of 10% or less of the battery's maximum charge power, and the threshold for the increase in the discharge command value can be set to a value of 10% or less of the battery's rated output. The same applies to setting the decrease range for the power generation command value and the decrease range for the discharge command value. The values ​​given here are examples and do not exclude settings that exceed 10% of the rated power, etc. In addition, each threshold can be set to a value of 3% or more of the rated power, etc.

[0111] (Sixth embodiment) The sixth embodiment describes a command value calculation method that differs from the fifth embodiment and can be used in conjunction with the fifth embodiment, and which has a low load on the storage battery and PCS.

[0112] In this embodiment, if the increase / decrease range of the charge command value and the increase / decrease range of the discharge command value calculated in the command value calculation step do not exceed the respective set lower limits, the command values ​​calculated in the command value calculation step are discarded, or the command value transmission step S55 following the command value calculation step is canceled, so that the calculated charge command value and discharge command value are not transmitted. Similarly, for the power generation command value, if it does not exceed the set lower limit, the calculated power generation command value may not be transmitted. In this way, by not transmitting the command values ​​and reducing the number of times the power is changed by the command values, the load on the PCS and storage battery can be reduced.

[0113] Figure 11 is a flowchart of a power control program according to the sixth embodiment of the present invention. In the command value calculation step S54, it is determined whether the fluctuation range of the command value (the absolute value of the difference between the previous command value and the current command value) is less than or equal to the lower limit (S101). If multiple command values ​​are calculated, if at least one of them does not exceed the lower limit, it is determined to be below the threshold (Yes in S101), and only if both are below the threshold is it determined not to exceed the lower limit (No in S101).

[0114] If the calculated fluctuation range of the command value is less than or equal to the lower limit, the transmission of the command value is canceled (S103). On the other hand, if the calculated fluctuation range of the command value exceeds the lower limit, the transmission of the command value is executed without cancellation (S102).

[0115] Here, an example of canceling the command value transmission step has been described, but it is also possible to discard the calculated command values ​​at the end of the command value calculation step (remaining unchanged from the previous values), or, as in the second embodiment, to compare each command value with a lower limit and discard the calculated command value if it does not exceed the lower limit (remaining unchanged from the previous values).

[0116] Furthermore, this process may be performed only when switching from charging to discharging, or from discharging to charging (S69 after S67, S76 after S74, or S85) (both the charging command value and the discharging command value are set to 0).

[0117] Here, the lower limits of the fluctuation range of the charge command value and the lower limits of the fluctuation range of the discharge command value can be set so that they decrease as the elapsed time since the previous transmission of the charge command value and discharge command value (or the previous switch from charge to discharge, or switch from discharge to charge) increases. In this way, it is possible to maximize the use of generated power while reducing the load on the PCS and storage battery. The relationship between elapsed time and the lower limit is such that the lower limit is a function of elapsed time, and this function can be a linear, nonlinear, or discontinuous monotonic function (non-increasing function) in the broad sense.

[0118] Furthermore, the lower limit of the fluctuation range of the power generation command value can be set as appropriate, for example, to 1-5% of the rated power of the power conditioner; the lower limit of the fluctuation range of the charge command value can be set as 1-5% or less of the maximum charging power of the battery; and the lower limit of the fluctuation range of the discharge command value can be set as 1-5% or less of the rated output of the battery. If the lower limit changes over time, the minimum value may be set to 0 (kW), but it may also be set to a value such as 0.5% or 1% of the rated power of the power conditioner.

[0119] In the above example, the power control device 40 controls one PCS20, but the power control device 40 may control multiple PCS20s. Similarly, the power control device 40 may control multiple batteries 30s. When controlling multiple PCS20s and batteries 30s, the configuration may control each of the PCS20s and batteries 30s equally, or it may be a configuration in which the command value is sent to the smallest possible PCS20s and batteries 30s, or other configurations may also be used. [Explanation of symbols]

[0120] 10. Solar cells (photovoltaic power generation equipment) 20 Power Conditioners (PCS) 30 Storage batteries 40 Power control device 50 Substation 60 load 70 Commercial power supply 90 servers 100 Power Control Systems 150 Power Control Systems 200 Power Control Systems

Claims

1. A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively. A power generation acquisition step involves acquiring power generated from the aforementioned power conditioner, A battery information acquisition step is to acquire charge / discharge status information from the aforementioned battery, The acquisition step involves obtaining the control schedule from the server, When the power to be controlled is determined by (the generated power + the discharge power of the battery - the charging power of the battery), the command value calculation step involves using the acquired information to set the power supplied to the power system based on the control schedule to match the power to be controlled, and calculating the power generation command value, the charging command value, and the discharge command value. The system is configured to perform a command value transmission step, which involves transmitting only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or the battery. When the potential power generated by the power conditioner, which can be determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, is defined as the potential power, A power control device that, when the value of the potential power is greater than the power generation command value, calculates each command value in the command value calculation step such that the power generation command value is made as large as possible within a range less than or equal to the value of the potential power.

2. The increase range of the power generation command value, the increase / decrease range of the charge command value, and the increase range of the discharge command value, calculated in the command value calculation step, are each less than or equal to a predetermined threshold set. The power control device according to claim 1.

3. If the range of increase or decrease of the charge command value and the range of increase or decrease of the discharge command value calculated in the command value calculation step do not exceed the respective set lower limits, the command values ​​calculated in the command value calculation step are discarded, or the command value transmission step following the command value calculation step is canceled, so as not to transmit the calculated charge command value and the discharge command value. The power control device according to claim 1.

4. The lower limit for the charge command value and the lower limit for the discharge command value are set to decrease as the elapsed time since the previous transmission of the charge command value and the discharge command value increases. The power control device according to claim 4.

5. The power control device according to claim 1, wherein the power control device comprises a processor and a memory configured to perform each of the above steps.

6. A power control system comprising: the power control device described in claim 1; the power conditioner; the storage battery; and a solar cell connected to the power conditioner.

7. A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively. A power generation acquisition step involves acquiring power generated from the aforementioned power conditioner, A battery information acquisition step is to acquire charge / discharge status information from the aforementioned battery, The acquisition step involves obtaining the control schedule from the server, A power consumption acquisition step to obtain the power consumption of the load, When the power to be controlled is determined by (the generated power + the discharge power of the battery - the charging power of the battery), the command value calculation step calculates the power generation command value, the charging command value, and the discharge command value by setting the power supplied to the power system based on the control schedule to match (the power to be controlled + the power consumption of the load) using the acquired information. The system is configured to perform a command value transmission step, which involves transmitting only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or the battery. When the potential power generated by the power conditioner, which can be determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, is defined as the potential power, A power control device that, when the value of the potential power is greater than the power generation command value, calculates each command value in the command value calculation step such that the power generation command value is made as large as possible within a range less than or equal to the value of the potential power.

8. A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively. A power generation acquisition step involves acquiring power generated from the aforementioned power conditioner, A battery information acquisition step is to acquire charge / discharge status information from the aforementioned battery, A power consumption acquisition step to obtain the power consumption value of the load, When the power to be controlled is determined by (the generated power + the discharge power of the battery - the charging power of the battery), the command value calculation step involves using the acquired information to set the difference between the upper limit of the power to be controlled and the power consumption to be a function of the power consumption, and calculating the power generation command value, the charging command value, and the discharge command value. A power control device configured to perform a command value transmission step of transmitting only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or the battery.

9. A power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively. A power generation acquisition step involves acquiring power generated from the aforementioned power conditioner, A battery information acquisition step is to acquire charge / discharge status information from the aforementioned battery, A power consumption acquisition step to obtain the power consumption value of the load, When the power to be controlled is determined by (the generated power + the discharge power of the battery - the charging power of the battery), the command value calculation step involves using the acquired information to set the difference between the upper limit of the power to be controlled and the power consumption to be a function of the power consumption, and calculating the power generation command value, the charging command value, and the discharge command value. The system is configured to perform a command value transmission step, which involves transmitting only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or the battery. When the potential power generated by the power conditioner, which can be determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, is defined as the potential power, In the command value calculation step, a power control device calculates the power generation command value, the discharge command value, and the charge command value such that the power generation command value is made as large as possible within a range less than or equal to the value of the potential power.

10. When the difference between the aforementioned power consumption and the upper limit of the power to be controlled is set as the target value for electricity purchase, In the command value calculation step, the power generation command value, the discharge command value, and the charge command value are calculated such that the power generation command value is less than or equal to the potential power value, and the value of electricity purchased from the commercial power source is greater than or equal to the target purchase value and as small as possible. The power control device according to claim 9.

11. The command value calculation step is performed when the value of purchased electricity is equal to the target value of purchased electricity and the value of potential power is greater than the generation command value. In the command value calculation step, each command value is calculated such that the value of the purchased electricity is kept equal to the target value of the purchased electricity, while the generation command value is made as large as possible within a range less than or equal to the value of the potential power. The power control device according to claim 10.

12. In the command value calculation step, if the value of purchased electricity is greater than the target value of purchased electricity, and the value of potential electricity is greater than the power generation command value, Each command value is calculated such that the value of the purchased electricity is equal to the target value of the purchased electricity, and the generation command value is as large as possible within the range of the potential power value or less. The power control device according to claim 10.

13. In the command value calculation step, if the value of purchased electricity is greater than the target value of purchased electricity, and the value of potential electricity is equal to the power generation command value, The command values ​​are calculated such that the discharge power of the battery is increased and / or the charge power of the battery is decreased so that the value of the purchased electricity is equal to or greater than the target value of the purchased electricity and as small as possible. The power control device according to claim 10.

14. In the command value calculation step, if the value of the purchased electricity is smaller than the target value of the purchased electricity, The discharge command value or the charge command value is calculated to decrease the discharge power of the battery and / or increase the charge power of the battery so that the target value of electricity purchased and the value of electricity purchased are equal. The power control device according to claim 10.

15. In the command value calculation step, if there is no remaining charge capacity for the battery, The generated power is reduced, and each command value is calculated so that it becomes equal to the target value of electricity purchased and the value of electricity purchased. The power control device according to claim 14.

16. The aforementioned function is a linear function. The power control device according to claim 9.

17. A method executed by a power control device that transmits a power generation command value, which is the upper limit of the generated power, to a power conditioner, and a charge command value and a discharge command value to a storage battery, respectively, A power generation acquisition step involves acquiring power generated from the aforementioned power conditioner, A battery information acquisition step is to acquire charge / discharge status information from the aforementioned battery, The acquisition step involves obtaining the control schedule from the server, When the power to be controlled is determined by (the generated power + the discharge power of the battery - the charging power of the battery), the command value calculation step involves using the acquired information to set the power supplied to the power system based on the control schedule to match the power to be controlled, and calculating the power generation command value, the charging command value, and the discharge command value. The system includes a command value transmission step of transmitting only the command values ​​that have been changed, and / or all calculated command values, to the power conditioner and / or the battery, When the potential power generated by the power conditioner, which can be determined from the solar radiation intensity, the panel capacity of the solar cells connected to the power conditioner, and the rated capacity of the power conditioner, is defined as the potential power, A method for calculating the power generation command value, the discharge command value, and the charge command value in the command value calculation step, such that the power generation command value is made as large as possible within a range less than or equal to the value of the potential power.

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