Control device and control method

Abstract

To provide a technique capable of stably operating an autonomous operation of a smart grid.SOLUTION: A control apparatus 10 is a control apparatus 10 for supporting an autonomous operation of a smart grid 2 having a power generation facility that performs a power generation by a renewable energy, a first power storage battery 6 that controls a voltage of the smart grid 2 to a target value, and a second power storage battery 7 that performs a charging and discharging in accordance with a charging and discharge command. The control apparatus 10 comprises: an acquisition part 11 that acquires a power to be generated in the smart grid 2 and a power consumption in the smart grid 2; a calculation part 12 that calculates a difference power as a difference between the power to be generated and the power consumption; a determination part 15 that determines a charging and discharging power of the second power storage battery 7 by using the difference power; and a control part 16 that transmits the charging and discharging command indicating the charging and discharging power of the second power storage battery 7 to be determined to the second power storage battery 7.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] In a smart grid, a mechanism for assisting autonomous operation is known. For example, Patent Document 1 describes a battery control device that enables autonomous operation of a renewable energy power generation device. In the invention described in Patent Document 1, a first power conversion device that controls an output voltage to a target voltage and a second power conversion device that controls an output current to a target current are used. In the invention described in Patent Document 1, the charge / discharge amount of the second power conversion device is determined so as to absorb the output of the first power conversion device. That is, in the invention described in Patent Document 1, the charge / discharge amount of the second power conversion device varies according to the output of the first power conversion device. In the invention described in Patent Document 1, the amount of voltage control by the first power conversion device increases.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a smart grid that generates power from renewable energy, autonomous operation may be performed. In power generation from renewable energy, for example, it is easily affected by environmental factors such as weather and wind volume, and voltage fluctuations are likely to occur. If the voltage fluctuations are large, it becomes difficult to continue autonomous operation. Therefore, a mechanism for stably operating autonomous operation is required.

[0005] An object of the present disclosure is to provide a technology capable of stably operating the autonomous operation of a smart grid.

Means for Solving the Problems

[0006] A control device according to an aspect of the present disclosure is a control device that supports autonomous operation of a smart grid including a power generation facility that generates power by renewable energy, a first storage battery that controls the voltage of the smart grid to a target value, and a second storage battery that charges and discharges according to a charge / discharge command. The control device includes an acquisition unit that acquires the generated power in the smart grid and the power consumption in the smart grid, a calculation unit that calculates the differential power that is the difference between the generated power and the power consumption, a determination unit that determines the charge / discharge power of the second storage battery using the differential power, and a control unit that transmits a charge / discharge command indicating the determined charge / discharge power of the second storage battery to the second storage battery.

[0007] A control method according to an aspect of the present disclosure is a control method executed by a control device that supports autonomous operation of a smart grid including a power generation facility that generates power by renewable energy, a first storage battery that controls the voltage of the smart grid to a target value, and a second storage battery that charges and discharges according to a charge / discharge command. The control method includes acquiring the generated power in the smart grid and the power consumption in the smart grid, calculating the differential power that is the difference between the generated power and the power consumption, determining the charge / discharge power of the second storage battery using the differential power, and transmitting a charge / discharge command indicating the determined charge / discharge power of the second storage battery to the second storage battery.

[0008] In the control device and the control method, in the autonomous operation of the smart grid, the charge / discharge power of the second storage battery is determined using the differential power that is the difference between the generated power and the power consumption. Charging and discharging are performed by the second storage battery according to the charge / discharge command indicating the determined charge / discharge power of the second storage battery. The differential power is eliminated in advance by the charging and discharging of the second storage battery. Fluctuations in the voltage of the smart grid caused by the differential power are suppressed. As a result, the operation of the first storage battery that controls the voltage of the smart grid to the target value is stabilized. As a result, the autonomous operation of the smart grid can be stably operated.

[0009] The acquisition unit may acquire the charge level of the first battery and the charge level of the second battery. The control device may further include a correction unit that calculates correction power for charging and discharging the second battery corresponding to the priority order of the charge level of the first battery and the charge level of the second battery. The determination unit may determine the charge and discharge power of the second battery using the differential power and the correction power. According to such a configuration, the correction power calculated according to the charge level of the first battery and the charge level of the second battery is reflected in the charge and discharge power of the second battery. Thereby, it becomes easy to control the charge level of the first battery and the charge level of the second battery by charging and discharging the second battery. As a result, the autonomous operation of the smart grid can be operated more stably.

[0010] The acquisition unit may acquire the charge and discharge power of the first battery. The control device may further include a transfer unit that calculates transfer power for charging and discharging the second battery corresponding to a part or all of the power value exceeding a predetermined range when the charge and discharge power of the first battery exceeds the predetermined range. The determination unit may determine the charge and discharge power of the second battery using the differential power and the transfer power. According to such a configuration, the transfer power calculated according to the charge and discharge power of the first battery exceeding the predetermined range is reflected in the charge and discharge power of the second battery. That is, a part or all of the power value exceeding the predetermined range is transferred to the charge and discharge power of the second battery 7. Thereby, it is possible to prevent the charge and discharge power of the first battery from becoming excessive, so that the operation of the first battery is stabilized. As a result, the autonomous operation of the smart grid can be operated more stably.

[0011] The acquisition unit may acquire the charge level of the first storage battery and the charge level of the second storage battery. The control device may further include a limiting unit that limits the generated power with the upper limit value being the power consumption when the charge levels of the first storage battery and the second storage battery are each equal to or higher than a predetermined value. According to such a configuration, when the charge levels of the first storage battery and the second charge level are equal to or higher than a predetermined value, the generated power is limited with the upper limit value being the power consumption. For example, when both the first storage battery and the second storage battery are fully charged, it becomes difficult to continue the autonomous operation. By limiting the generated power, it is possible to suppress the charge levels of the first storage battery and the second storage battery from being charged to equal to or higher than a predetermined value respectively. As a result, the autonomous operation of the smart grid can be more stably operated.

Effect of the Invention

[0012] According to the present disclosure, it is possible to provide a technology capable of stably operating the autonomous operation of a smart grid.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments for implementing the present disclosure will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are assigned to the same elements, and duplicate descriptions are omitted.

[0015] [Control System] The control system according to the present disclosure supports operation in a smart grid. The smart grid is connected to an external power grid. In normal operation, the smart grid receives power supply from the power grid. In an emergency operation such as when an accident occurs in the power grid, the connection between the smart grid and the power grid is cut off. In this case, the smart grid cannot receive power supply from the power grid. The control system supports autonomous operation that supplies power into the smart grid independently from the power grid. In the control system, a first storage battery that controls the voltage in the smart grid and a second storage battery that performs charge and discharge are used. The control system performs charge and discharge of the second storage battery according to the difference between the generated power and the consumed power in the smart grid. Thereby, fluctuations in the voltage in the smart grid controlled by the first storage battery are suppressed.

[0016] FIG. 1 is a schematic configuration diagram of a control system 1 according to an embodiment. The control system 1 is applied to autonomous operation in a smart grid 2. FIG. 1 shows a state in which the connection between the smart grid 2 and the power grid 3 is cut off. The smart grid 2 is in a state where it cannot receive power supply from the power grid 3 via an external high-voltage line L1.

[0017] The smart grid 2 includes a high-voltage connection board 4, a power generation facility 5, a first storage battery 6, a second storage battery 7, a load 8, and an instantaneous power meter 9.

[0018] The high-voltage connection board 4 is connected to the power system 3 via the high-voltage line L1 during normal operation. The connection between the high-voltage connection board 4 and the power system 3 via the high-voltage line L1 is interrupted during emergency operation. The high-voltage connection board 4 is connected to the power generation facility 5, the first storage battery 6, the second storage battery 7, and the load 8 via the high-voltage line L2. An instantaneous power meter 9 is provided on the path from the high-voltage connection board 4 to the load 8. The high-voltage connection board 4 supplies power to each device in the smart grid 2.

[0019] The power generation facility 5 is a facility that generates electricity by renewable energy within the smart grid 2. The power generation facility 5 supplies the generated electricity within the smart grid 2. The unit of the generated electricity is, for example, [kW]. Examples of the renewable energy include, but are not limited to, sunlight or wind power. The power generation facility 5 is, for example, a solar power generation facility. The power generation facility 5 includes a PCS51 (Power Conditioning System) and a solar panel 52. The PCS51 converts the direct current generated by the solar panel 52 into alternating current.

[0020] The configuration of the PCS51 may be either centralized or distributed. The centralized configuration is one in which a single PCS51 collectively manages a plurality of solar panels 52. In the centralized configuration, a single PCS51 can control the total generated electricity. The distributed configuration is one in which a plurality of PCS51s respectively manage the corresponding plurality of solar panels 52. In the distributed configuration, the total generated electricity can be controlled by starting or stopping the operations of the plurality of PCS51s.

[0021] The first storage battery 6 controls the voltage of the smart grid 2 to a target value. For example, the target value is, for example, a value similar to the voltage of the power grid 3. The first storage battery 6 controls the voltage in the high-voltage line L2 to reach the target value. The first storage battery 6 stabilizes the voltage and frequency of the smart grid 2 by controlling the voltage. As a result, the independent operation of the smart grid 2 becomes possible. The first storage battery 6 is, for example, a storage battery system. The first storage battery 6 includes a battery PCS 61 and a battery 62. The battery PCS 61 controls the battery 62 as a function of the PCS itself. In other words, the battery PCS 61 is a PCS capable of independent operation. For example, the battery PCS 61 controls the voltage of the smart grid 2 to reach the target value. The battery PCS 61 converts the DC of the battery 62 into AC. The battery PCS 61 has a capacity of, for example, 500 kW of charging power and 500 kW of discharging power.

[0022] The battery 62 is a general term for devices having the function of storing and supplying electric power. For example, the battery 62 may be a general type of storage battery such as a lead-acid battery, a lithium-ion secondary battery, a solid-state battery, a nickel-metal hydride battery, a nickel-cadmium battery, a nickel-iron battery, a nickel-zinc battery, a silver oxide-zinc battery, or a cobalt titanium lithium secondary battery. The battery 62 may be a liquid circulation type of storage battery such as a redox flow battery, a zinc-chlorine battery, or a zinc-bromine battery. The battery 62 may be a mechanically rechargeable type of storage battery such as an aluminum-air battery, an air-zinc battery, or an air-iron battery. The battery 62 may be a high-temperature operation type of storage battery such as a sodium-sulfur battery, a lithium-iron sulfide battery, an electron trap type, or a semiconductor secondary battery.

[0023] The second storage battery 7 performs charge and discharge according to a charge / discharge command. The second storage battery 7 suppresses fluctuations in the voltage of the smart grid 2 by charge and discharge. The second storage battery 7 is, for example, a battery system. The second storage battery 7 includes a battery PCS 71 and a storage battery 72. The battery PCS 71 controls the storage battery 72 in response to control from the control device 10. The battery PCS 71 converts the direct current of the storage battery 72 into alternating current. The battery PCS 71 has a capacity of, for example, a charging power of 500 kW and a discharging power of 500 kW.

[0024] The storage battery 72 has the same functions as the storage battery 62. The storage battery 72 has the same configuration as the storage battery 62. Although FIG. 1 shows a single second storage battery 7, a plurality of second storage batteries 7 may be provided. The second storage battery 7 may be a bidirectional EV charger including an EV (Electric Vehicle) battery. A bidirectional EV charger is a charger capable of charge and discharge with an electric vehicle.

[0025] The first storage battery 6 and the second storage battery 7 can function as power conditioning devices when adjusting the power transfer between the smart grid 2 and the external power grid 3 during normal operation. The first storage battery 6 can function as a self-operating side storage battery that adjusts the voltage within the smart grid 2 during abnormal operation. The second storage battery 7 can function as a following side storage battery that adjusts the charge and discharge power within the smart grid 2 during abnormal operation.

[0026] The load 8 consumes the power within the smart grid 2. Examples of the load 8 include, but are not limited to, factories, homes, public facilities, and hospitals. The instantaneous power meter 9 is provided corresponding to the load 8. The instantaneous power meter 9 measures the power consumption of the load 8. The unit of power consumption is, for example, [kW]. Although FIG. 1 shows a single load 8 and a single instantaneous power meter 9, a plurality of loads 8 and a plurality of instantaneous power meters 9 may be provided.

[0027] The control device 10 supports the autonomous operation of the smart grid 2. The control device 10 controls or monitors each device within the smart grid 2. The control device 10 is, for example, an EMS (Energy Management System). The control device 10 is communicably connected to the smart grid 2. The control device 10 may be a component of the smart grid 2.

[0028] Figure 2 is a block diagram illustrating the functional configuration of the control device 10. The control device 10 includes, as functional elements, an acquisition unit 11, a calculation unit 12, a correction unit 13, a transfer unit 14, a determination unit 15, a control unit 16, and a restriction unit 17.

[0029] The acquisition unit 11 acquires information from each device within the smart grid 2. For example, the acquisition unit 11 acquires the state quantity of the high-voltage switchboard 4 from the high-voltage switchboard 4. The state quantity is the measured value of the voltage of the high-voltage line L2. The acquisition unit 11 acquires the generated power within the smart grid 2. For example, the acquisition unit 11 acquires the generated power of the power generation facility 5 from the power generation facility 5. The acquisition unit 11 acquires the charge level and charge / discharge power of the first storage battery 6 from the first storage battery 6. The charge level is also referred to as the state of charge (SOC). The charge level is represented with a fully discharged state as 0% and a fully charged state as 100%. The acquisition unit 11 acquires the charge level of the second storage battery 7 from the second storage battery 7. The acquisition unit 11 may acquire the charge / discharge power of the second storage battery 7 from the second storage battery 7. The acquisition unit 11 acquires the power consumption within the smart grid 2. For example, the acquisition unit 11 acquires the power consumption of the load 8 from the instantaneous power meter 9. The acquisition unit 11 may acquire the respective power consumptions of a plurality of loads 8 from the respective ones of a plurality of instantaneous power meters 9. The acquisition unit 11 may acquire in advance the capacities of the battery PCS 61 of the first storage battery 6 and the battery PCS 71 of the second storage battery 7. The acquisition unit 11 may acquire in advance information on whether the configuration of the PCS 51 is centralized or distributed.

[0030] The calculation unit 12 calculates the differential power, which is the difference between the generated power and the consumed power. For example, the calculation unit 12 calculates the differential power, which is the difference between the generated power of the power generation facility 5 and the total value of the consumed power by the plurality of loads 8. In one example, the differential power is obtained by generated power - consumed power. That is, when the differential power is a positive value, it can be said that the generated power is greater than the consumed power. On the contrary, when the differential power is a negative value, it can be said that the consumed power is greater than the generated power.

[0031] The calculation unit 12 may perform adjustment on the difference to calculate the differential power. For example, the calculation unit 12 may multiply the difference by a gain coefficient G. The gain coefficient may be G = 1 when there is no time difference between the generated power and the consumed power. The gain coefficient may be a value in the range of 0 < G < 1 when there is a time difference between the generated power and the consumed power. By reducing the gain of the difference, hunting is suppressed. The calculation unit 12 may perform integral correction on the difference. For example, the calculation unit 12 may multiply the difference by a gain coefficient G and an integral coefficient. The calculation unit 12 may apply a rate limiter that limits the rate of change to the difference.

[0032] The correction unit 13 calculates the correction power for charging and discharging the second storage battery 7 corresponding to the priority order of the charge level of the first storage battery 6 and the charge level of the second storage battery 7. For example, the correction unit 13 classifies the charge level of the first storage battery 6 into any one of "high", "medium", and "low" using a threshold value. In one example, the correction unit 13 classifies the charge level of the first storage battery 6 as "high" when it is higher than 75%, "medium" when it is 50 - 75%, or "low" when it is lower than 50%. Similarly, the correction unit 13 classifies the charge level of the second storage battery 7 into any one of "high", "medium", and "low" using a threshold value.

[0033] The correction unit 13 determines the priority using each classified charging level. The correction unit 13 calculates the correction power according to the priority. For example, the correction unit 13 determines a first priority, a second priority, and a third priority. The first priority, the second priority, and the third priority indicate that the priorities are high in this order. When the charging level of the first battery 6 is "low", the correction unit 13 determines the priority as the first priority. When the charging level of the second battery 7 is "low", the correction unit 13 determines the priority as the second priority. When the charging level of the first battery 6 is "high", the correction unit 13 determines the priority as the third priority.

[0034] When the determined priority is the first priority, it can be said that the charging level of the first battery 6 is decreasing. The correction unit 13 calculates the discharge power of the second battery 7 as the correction power so as to compensate for the decrease in the charging level of the first battery 6. In one example, the correction unit 13 calculates the correction power using a first correction function in which the discharge power of the second battery 7 increases as the charging level of the first battery 6 decreases. In one example, the first correction function can obtain the discharge power D1 of the second battery 7 when the charging level of the first battery 6 is 45%. In another example, the first correction function can obtain the discharge power D2 of the second battery 7 when the charging level of the first battery 6 is 40%. The relationship between the discharge power D1 and the discharge power D2 is discharge power D1 < discharge power D2. The first correction function may be provided with a limit on the correction power. For example, when the charging level of the first battery 6 is 25% or less, the first correction function may set the discharge power of the second battery 7 to a constant value.

[0035] When the determined priority is the second priority, it can be said that the charge level of the second battery 7 has decreased. The correction unit 13 calculates the charging power of the second battery 7 as correction power so as to compensate for the decrease in the charge level of the second battery 7. In one example, the correction unit 13 calculates the correction power using a second correction function in which the charging power of the second battery 7 increases as the charge level of the second battery 7 decreases. In one example, the second correction function can obtain the charging power C1 of the second battery 7 when the charge level of the second battery 7 is 20%. In another example, the second correction function can obtain the charging power C2 of the second battery 7 when the charge level of the second battery 7 is 15%. The relationship between the charging power C1 and the charging power C2 is that the charging power C1 < the charging power C2.

[0036] When the determined priority is the third priority, it can be said that the charge level of the first battery 6 is excessive. The correction unit 13 calculates the discharge power of the first battery 6 as correction power so as to suppress the increase in the charge level of the first battery 6. In one example, the correction unit 13 calculates the correction power using a third correction function in which the charging power of the second battery 7 increases as the charge level of the first battery 6 increases. In one example, the third correction function can obtain the charging power C3 of the second battery 7 when the charge level of the first battery 6 is 80%. In another example, the third correction function can obtain the charging power C4 of the second battery 7 when the charge level of the first battery 6 is 85%. The relationship between the charging power C3 and the charging power C4 is that the charging power C3 < the charging power C4.

[0037] When the determined priority is not any of the first priority, the second priority, and the third priority, the correction unit 13 does not calculate the correction power. In one example, when the charge level of the first battery 6 is "medium" and the charge level of the second battery 7 is "medium", it does not correspond to any of the first priority, the second priority, and the third priority. In this case, the correction unit 13 does not calculate the correction power.

[0038] When the charge-discharge power of the first storage battery 6 exceeds a predetermined range, the transfer unit 14 calculates transfer power for charging and discharging the second storage battery 7 corresponding to a part or all of the power value exceeding the predetermined range. The charge-discharge power of the first storage battery 6 is, for example, an instantaneous value. The predetermined range is, for example, from 70% of the charging power to 70% of the discharging power, but is not limited thereto. The transfer unit 14 may calculate the transfer power so as to transfer, for example, half of the power value exceeding the predetermined range to the second storage battery 7. The transfer unit 14 may calculate the transfer power when the charging power of the first storage battery 6 exceeds the predetermined range. The transfer unit 14 may calculate the transfer power when the discharging power of the first storage battery 6 exceeds the predetermined range.

[0039] In one example, when the capacity of the second storage battery 7 has a charging power of 500 kW and a discharging power of 500 kW, the predetermined range may correspond to a charging power of 350 kW and a discharging power of 350 kW. For example, when the instantaneous value of the charging power of the first storage battery 6 is 400 kW, the transfer unit 14 calculates the power value exceeding 350 kW as 50 kW. The transfer unit 14 calculates the transfer power so as to transfer a part or all of the 50 kW to the charging power of the second storage battery 7. In another example, when the instantaneous value of the discharging power of the first storage battery 6 is 400 kW, the transfer unit 14 calculates the power value exceeding 350 kW as 50 kW. The transfer unit 14 calculates the transfer power so as to transfer a part or all of the 50 kW to the discharging power of the second storage battery 7.

[0040] In one example, the transfer unit 14 may calculate the transfer power using a first transfer function in which the charging power of the second storage battery 7 increases as the charging power of the first storage battery 6 exceeds the predetermined range and increases. In one example, the first transfer function can obtain the charging power C5 of the second storage battery 7 when the charging power of the first storage battery 6 is 75%. In another example, the first transfer function can obtain the charging power C6 of the second storage battery 7 when the charging power of the first storage battery 6 is 80%. The relationship between the charging power C5 and the charging power C6 is charging power C5 < charging power C6.

[0041] In another example, the transfer unit 14 may calculate the transfer power using a second transfer function in which the discharge power of the second battery 7 increases as the discharge power of the first battery 6 increases beyond a predetermined range. In one example, the second transfer function can determine the discharge power D3 of the second battery 7 when the discharge power of the first battery 6 is 75%. In another example, the second transfer function can determine the discharge power D4 of the second battery 7 when the discharge power of the first battery 6 is 80%. The relationship between the discharge power D3 and the discharge power D4 is discharge power D3 < discharge power D4.

[0042] When the charge-discharge power of the first battery 6 is within a predetermined range, the transfer unit 14 may not calculate the transfer power. In one example, when the charge power of the first battery 6 is 0 to 70%, or when the discharge power of the first battery 6 is within the range of 0 to 70%, the transfer unit 14 may not calculate the transfer power.

[0043] The determination unit 15 determines the charge-discharge power of the second battery 7 using the differential power between the generated power and the consumed power. For example, the determination unit 15 determines whether it is charge power or discharge power according to the positive or negative of the differential power. Here, it is described assuming that the differential power is obtained by generated power - consumed power. When the differential power is a positive value, the determination unit 15 determines the charge power corresponding to the differential power as the charge-discharge power of the second battery 7. When the differential power is a negative value, the determination unit 15 determines the discharge power corresponding to the differential power as the charge-discharge power of the second battery 7. The determination unit 15 may limit the charge-discharge power of the second battery 7 according to the capacity of the battery PCS 71. For example, the determination unit 15 may determine a command upper limit that is the upper limit of the charge-discharge power in the charge-discharge command.

[0044] The determination unit 15 may also determine the charge-discharge power of the second battery 7 using the differential power and the correction power. For example, the determination unit 15 may determine the power value obtained by adding the differential power and the correction power as the charge-discharge power of the second battery 7.

[0045] The determination unit 15 may determine the charge-discharge power of the second storage battery 7 using the differential power and the transfer power. For example, the determination unit 15 may determine, as the charge-discharge power of the second storage battery 7, a power value obtained by adding the differential power and the transfer power.

[0046] The determination unit 15 may determine the charge-discharge power of the second storage battery 7 using the differential power, the correction power, and the transfer power. For example, the determination unit 15 may determine, as the charge-discharge power of the second storage battery 7, a power value obtained by adding the differential power, the correction power, and the transfer power.

[0047] The control unit 16 transmits a charge-discharge command indicating the determined charge-discharge power to the second storage battery 7. For example, the control unit 16 may transmit a charge-discharge command indicating the charging power to the second storage battery 7. The control unit 16 may transmit a charge-discharge command indicating the discharging power to the second storage battery 7. When the second storage battery 7 is composed of a plurality of units, the control unit 16 may determine the distribution of the charge-discharge power for each of the plurality of second storage batteries 7. For example, the control unit 16 may preferentially distribute the charging power to the second storage battery 7 with a lower charge level among the plurality of second storage batteries 7. The control unit 16 may preferentially distribute the discharging power to the second storage battery 7 with a higher charge level among the plurality of second storage batteries 7.

[0048] The restriction unit 17 performs the solar power generation output suppression control in the present embodiment. When the charge levels of the first storage battery 6 and the second storage battery 7 are each equal to or higher than a predetermined value, the restriction unit 17 restricts the generated power with the consumption power as the upper limit value. The predetermined value may be any value that does not result in a fully charged state. The predetermined value is, for example, 80%, but is not limited thereto. The upper limit value may be the total value of the consumption power or a moving average of the total value of the consumption power. For example, the restriction unit 17 transmits a command indicating the restriction of the generated power to the PCS 51 of the power generation facility 5.

[0049] When the PCS 51 is a centralized type, the restriction unit 17 transmits a command to restrict the upper limit value of the generated power by the plurality of solar panels 52 to the PCS 51. The centralized PCS 51 restricts the upper limit value of the generated power according to the command.

[0050] When the PCSs 51 are distributed, the limiting unit 17 calculates the power generation capacity, which is the power that can be generated by the plurality of solar panels 52. The limiting unit 17 calculates the power generation capacity using, for example, the illuminance, temperature, power generation amount of the plurality of solar panels 52, and the like. The limiting unit 17 calculates the start-up upper limit, which is the upper limit number of units for starting the plurality of PCSs 51 so that the calculated power generation capacity does not exceed the upper limit value. The limiting unit 17 transmits a command indicating control of starting or stopping the plurality of PCSs 51 to each of the plurality of PCSs 51. The distributed PCSs 51 start or stop according to the command.

[0051] The operation of the control device 10 will be described with reference to FIGS. 3 to 5, and an example of the control method will also be described. FIG. 3 is a flowchart showing an example of the processing of the control device 10 as a processing flow M1.

[0052] In FIG. 3, the smart grid 2 will be described as having undergone preprocessing before starting autonomous operation after the connection with the power grid 3 is cut off. For example, when the connection between the smart grid 2 and the power grid 3 is cut off, a power outage occurs in the smart grid 2. As the first step of the preprocessing, the control device 10 activates the first storage battery 6 to control the voltage of the smart grid 2 to the target value. As the second step of the preprocessing, the control device 10 transmits a charge-discharge command indicating charging to the second storage battery 7. The second storage battery 7 functions as a pseudo load by performing charging. As the third step of the preprocessing, the control device 10 activates the power generation facility 5. In the smart grid 2, power consumption by the load 8 is started.

[0053] In step S1, the acquisition unit 11 acquires the power generated in the smart grid 2 and the power consumed in the smart grid 2. For example, the acquisition unit 11 acquires the power generated by the power generation facility 5 from the power generation facility 5. For example, the acquisition unit 11 acquires the power consumed by the load 8 from the instantaneous power meter 9. The acquisition unit 11 may acquire the power consumption of each of the plurality of loads 8 from each of the plurality of instantaneous power meters 9.

[0054] In step S2, the calculation unit 12 calculates the difference between the generated power and the consumed power. The calculation unit 12 calculates the difference between the generated power and the consumed power. For example, the calculation unit 12 calculates the difference between the generated power of the power generation facility 5 and the total value of the consumed power by the plurality of loads 8.

[0055] In step S3, the calculation unit 12 adjusts the difference between the generated power and the consumed power. For example, the calculation unit 12 performs an adjustment on the difference to calculate the differential power. The calculation unit 12 may multiply the difference by the gain coefficient G. The calculation unit 12 may multiply the difference by the gain coefficient G and the integral coefficient. The calculation unit 12 may apply a rate limiter that limits the rate of change to the difference. The calculation unit 12 may perform the adjustment so that the value does not change before and after the adjustment of the difference, or may not perform the adjustment.

[0056] In step S4, the control device 10 performs battery charge remaining amount control. Referring to FIG. 4, an example of the battery charge remaining amount control will be described. FIG. 4 is a flowchart showing an example of the battery charge remaining amount control. For example, in the battery charge remaining amount control, a correction power for bringing the charge level of the first battery 6 close to a specified range (for example, 50 to 75%) is calculated. Alternatively, in the battery charge remaining amount control, a correction power for bringing the charge level of the second battery 7 close to a value equal to or higher than a specified value (for example, 25% or higher) is calculated. In other words, in the battery charge remaining amount control, the charge levels of the first battery 6 and the second battery 7 are stabilized.

[0057] In step S41, the acquisition unit 11 acquires the charge levels of the first battery 6 and the second battery 7. For example, the acquisition unit 11 acquires the charge level of the first battery 6 from the first battery 6. The acquisition unit 11 acquires the charge level of the second battery 7 from the second battery 7.

[0058] In step S42, the correction unit 13 classifies the charge levels of the first battery 6 and the second battery 7. For example, the correction unit 13 uses a threshold value to classify the charge level of the first battery 6 as either "high", "medium", or "low". In one example, the correction unit 13 classifies the charge level of the first battery 6 as "high" if it is higher than 75%, "medium" if it is between 50% and 75%, or "low" if it is lower than 50%. Similarly, the correction unit 13 uses a threshold value to classify the charge level of the second battery 7 as either "high", "medium", or "low".

[0059] In step S43, the correction unit 13 determines whether the charge level of the first battery 6 is low. If the charge level of the first battery 6 is "low" (step S43: YES), the process proceeds to step S44. If the charge level of the first battery 6 is "medium" or "high" (step S43: NO), the process proceeds to step S45.

[0060] In step S44, the correction unit 13 selects a first correction function in which the lower the charge level of the first battery 6, the greater the discharge power of the second battery 7.

[0061] In step S45, the correction unit 13 determines whether the charge level of the second battery 7 is low. If the charge level of the second battery 7 is "low" (step S45: YES), the process proceeds to step S46. If the charge level of the second battery 7 is "medium" or "high" (step S45: NO), the process proceeds to step S47.

[0062] In step S46, the correction unit 13 selects a second correction function in which the lower the charge level of the second battery 7, the greater the charging power of the second battery 7.

[0063] In step S47, the correction unit 13 determines whether the charge level of the first battery 6 is high. If the charge level of the first battery 6 is "high" (step S47: YES), the process proceeds to step S48. If the charge level of the first battery 6 is "medium" (step S47: NO), the process of step S4 ends.

[0064] In step S48, the correction unit 13 calculates the corrected power using a third correction function in which the higher the charge level of the first battery 6, the greater the charging power of the second battery 7.

[0065] In step S49, the correction unit 13 calculates the corrected power. For example, the correction unit 13 calculates the corrected power using the selected correction function among the first correction function, the second correction function, and the third correction function. In one example, the correction unit 13 calculates the discharge power of the second battery 7 as the corrected power using the selected first correction function. In another example, the correction unit 13 calculates the charging power of the second battery 7 as the corrected power using the selected second correction function. In yet another example, the correction unit 13 calculates the charging power of the second battery 7 as the corrected power using the selected third correction function.

[0066] In the battery charge remaining amount control of step S4, the corrected power is calculated when the charge level of the first battery 6 is not in the range of 50% to 75%, or when the charge level of the second battery 7 is 25% or less.

[0067] In step S5 shown in FIG. 3, the control device 10 performs self-sustaining side battery overcharge prevention control. With reference to FIG. 5, an example of the self-sustaining side battery overcharge prevention control will be described. FIG. 5 is a flowchart showing an example of the self-sustaining side battery overcharge prevention control. For example, in the self-sustaining side battery overcharge prevention control, a transfer power for transferring the charge and discharge power of the first battery 6 exceeding a predetermined range to the second battery 7 is calculated. In the self-sustaining side battery overcharge prevention control, an excessive charge and discharge power to the first battery 6 is transferred to the second battery 7, thereby preventing an abnormal stop of the first battery 6.

[0068] In step S51, the acquisition unit 11 acquires the charge-discharge power of the first storage battery 6 from the first storage battery 6. The acquired charge-discharge power of the first storage battery 6 is, for example, an instantaneous value.

[0069] In step S52, the transfer unit 14 determines whether the charging power of the first storage battery 6 exceeds a predetermined range. In one example, the predetermined range is, for example, 70% of the charging power. In this case, the transfer unit 14 determines whether the charging power of the first storage battery 6 exceeds 70%. If the charging power of the first storage battery 6 exceeds the predetermined range (step S52: YES), the process proceeds to step S53. If the charging power of the first storage battery 6 does not exceed the predetermined range (step S52: NO), the process proceeds to step S54.

[0070] In step S53, the transfer unit 14 selects a first transfer function in which the charging power of the second storage battery 7 increases as the charging power of the first storage battery 6 exceeds the predetermined range and increases.

[0071] In step S54, the transfer unit 14 determines whether the discharge power of the first storage battery 6 exceeds a predetermined range. In one example, the predetermined range is, for example, 70% of the discharge power. In this case, the transfer unit 14 determines whether the discharge power of the first storage battery 6 exceeds 70%. If the discharge power of the first storage battery 6 exceeds the predetermined range (step S54: YES), the process proceeds to step S54. If the discharge power of the first storage battery 6 does not exceed the predetermined range (step S54: NO), the process of step S5 ends.

[0072] In step S55, the transfer unit 14 selects a second transfer function in which the discharge power of the second storage battery 7 increases as the discharge power of the first storage battery 6 exceeds the predetermined range and increases.

[0073] In step S56, the transfer unit 14 calculates the transfer power. For example, the transfer unit 14 calculates the transfer power using the selected transfer function among the first transfer function and the second transfer function. In one example, the transfer unit 14 calculates the charging power of the second battery 7 as the transfer power using the selected first transfer function. In another example, the transfer unit 14 calculates the discharging power of the second battery 7 as the transfer power using the selected second transfer function.

[0074] Returning to FIG. 3, in step S6, the determination unit 15 adds the differential power, the correction power, and the transfer power. The correction power may not be calculated in the battery charge remaining amount control in step S4 and may be 0. In this case, the determination unit 15 may not perform the addition using the correction power. The transfer power may not be calculated in the self-sustaining side battery over-prevention control in step S5 and may be 0. In this case, the determination unit 15 may not perform the addition using the transfer unit 14.

[0075] In step S7, the determination unit 15 limits the charging and discharging power of the second battery 7 in the charge and discharge command. For example, the determination unit 15 determines the command upper limit according to the capacity of the battery PCS 71. In one example, when the capacity of the battery PCS 71 has a charging power of 500 kW and a discharging power of 500 kW, the command upper limit is below 500 kW of charging power and 500 kW of discharging power.

[0076] In step S8, the determination unit 15 determines the charging and discharging power of the second battery 7 using the differential power. The determination unit 15 determines the charging power and the discharging power according to the positive and negative of the differential power. Here, it is described assuming that the differential power is obtained by the generated power - the consumed power. When the differential power is a positive value, the determination unit 15 determines the charging power corresponding to the differential power as the charging and discharging power of the second battery 7. When the differential power is a negative value, the determination unit 15 determines the discharging power corresponding to the differential power as the discharging power of the second battery 7.

[0077] The determination unit 15 may determine the charge-discharge power of the second storage battery 7 using the differential power and the correction power. For example, the determination unit 15 may determine, as the charge-discharge power of the second storage battery 7, the power value obtained by adding the differential power and the correction power in step S6.

[0078] The determination unit 15 may determine the charge-discharge power of the second storage battery 7 using the differential power and the transfer power. For example, the determination unit 15 may determine, as the charge-discharge power of the second storage battery 7, the power value obtained by adding the differential power and the transfer power in step S6.

[0079] The determination unit 15 may determine the charge-discharge power of the second storage battery 7 using the differential power, the correction power, and the transfer power. For example, the determination unit 15 may determine, as the charge-discharge power of the second storage battery 7, the power value obtained by adding the differential power, the correction power, and the transfer power in step S6.

[0080] In step S9, the control unit 16 transmits a charge-discharge command indicating the determined charge-discharge power to the second storage battery 7. For example, the control unit 16 may transmit a charge-discharge command indicating the charge power to the second storage battery 7. The control unit 16 may transmit a charge-discharge command indicating the discharge power to the second storage battery 7. When the second storage battery 7 is composed of a plurality of units, the control unit 16 may determine the distribution of the charge-discharge power for each of the plurality of second storage batteries 7. For example, the control unit 16 may preferentially distribute the charge power to the second storage battery 7 with a low charge level among the plurality of second storage batteries 7. The control unit 16 may preferentially distribute the discharge power to the second storage battery 7 with a high charge level among the plurality of second storage batteries 7.

[0081] In processing flow M1, the processes of step S4 and step S5 may be performed in any order before step S6. The process of at least one of step S4 and step S5 may be omitted. After the process of step S9, the acquisition unit 11 may acquire the charge levels of the plurality of second storage batteries 7. The control unit 16 may perform feedback using the charge levels of the plurality of second storage batteries 7 and determine the distribution of charge and discharge power for each of the plurality of second storage batteries 7. After the process of step S9, the control device 10 may perform the storage battery charge remaining amount control of step S4.

[0082] Referring to FIG. 6, an example of the photovoltaic power generation output suppression control will be described. FIG. 6 is a flowchart showing an example of the photovoltaic power generation output suppression control as a processing flow M2. The processing flow M2 may or may not be incorporated into the processing flow M1. The processing flow M2 may be performed independently of the processing flow M1. For example, in the photovoltaic power generation output suppression control, the power generation facility 5 is controlled so that the charge levels of the first storage battery 6 and the second storage battery 7 approach a predetermined value (for example, 80%) or less.

[0083] In step S21, the acquisition unit 11 acquires the charge levels of the first storage battery 6 and the second storage battery 7. For example, the acquisition unit 11 acquires the charge level of the first storage battery 6 from the first storage battery 6. The acquisition unit 11 acquires the charge level of the second storage battery 7 from the second storage battery 7.

[0084] In step S22, the restriction unit 17 determines whether the charge levels of the first storage battery 6 and the second storage battery 7 are each equal to or greater than a predetermined value. The predetermined value is, for example, 80%, but is not limited thereto. When the charge levels of the first storage battery 6 and the second storage battery 7 are each equal to or greater than the predetermined value (step S22: YES), the process proceeds to step S23. When at least one of the charge levels of the first storage battery 6 and the second storage battery 7 is less than the predetermined value (step S22: NO), the processing flow M2 ends.

[0085] In step S23, the acquisition unit 11 acquires the power consumption within the smart grid 2. For example, the acquisition unit 11 acquires the power consumption of the load 8 from the instantaneous power meter 9. The acquisition unit 11 may acquire the power consumption of each of the plurality of loads 8 from each of the plurality of instantaneous power meters 9.

[0086] In step S24, the restriction unit 17 calculates the total value of the power consumption. The restriction unit 17 may calculate the moving average of the total value of the power consumption.

[0087] In step S25, the restriction unit 17 distributes the processing according to whether the PCS 51 is a centralized type or not. If the PCS 51 is a centralized type (step S25: YES), the processing proceeds to step S26. If the PCS 51 is a distributed type (step S25: NO), the processing proceeds to step S27.

[0088] In step S26, the restriction unit 17 transmits a command to limit the upper limit value of the power generation by the plurality of solar panels 52 to the PCS 51. The centralized PCS 51 limits the upper limit value of the power generation according to the command.

[0089] In step S27, the restriction unit 17 calculates the power generation capacity. The restriction unit 17 calculates the power generation capacity using, for example, the illuminance, temperature, and the power generation amount of the plurality of solar panels 52.

[0090] In step S28, the restriction unit 17 calculates the startup upper limit of the plurality of PCS 51 so that the calculated power generation capacity does not exceed the upper limit value of the power generation. The restriction unit 17 may use the number of started PCS 51 at the current time for calculating the startup upper limit.

[0091] In step S29, the restriction unit 17 transmits a command indicating the control of startup or stop of the plurality of PCS 51 to each of the plurality of PCS 51. The distributed PCS 51 starts up or stops according to the command.

[0092] [Hardware Configuration] FIG. 7 is a diagram showing an example of the hardware configuration related to the control system 1. FIG. 7 shows a computer 100 that functions as the control device 10. The computer 100 includes at least one processor 101, a main memory unit 102, an auxiliary storage unit 103, a communication control unit 104, an input device 105, and an output device 106. The control device 10 is constituted by one or a plurality of computers 100 constituted by these hardware and software such as programs.

[0093] When the control device 10 is constituted by a plurality of computers 100, these computers 100 may be locally connected or may be connected via a communication network such as the Internet or an intranet. By this connection, a logically single control device 10 is constructed.

[0094] The processor 101 executes an operating system, an application program, and the like. The processor 101 is, for example, a CPU (Central Processing Unit). The main memory unit 102 is constituted by a ROM (ReadOnly Memory) and a RAM (Random Access Memory). The auxiliary storage unit 103 is a storage medium constituted by a hard disk, a flash memory, and the like. The auxiliary storage unit 103 generally stores a larger amount of data than the main memory unit 102. The communication control unit 104 is constituted by a network card or a wireless communication module. At least a part of the communication function with other devices in the control device 10 may be realized by the communication control unit 104. The input device 105 is constituted by a keyboard, a mouse, a touch panel, a microphone for voice input, and the like. The output device 106 is constituted by a display, a printer, and the like.

[0095] The auxiliary storage unit 103 stores in advance a program 110 (control program) and data necessary for processing. The program 110 causes the computer 100 to execute each functional element of the control device 10. By the program 110, for example, the processing according to the above-described control method is executed in the computer 100. For example, the program 110 is read by the processor 101 or the main storage unit 102, and operates at least one of the processor 101, the main storage unit 102, the auxiliary storage unit 103, the communication control unit 104, the input device 105, and the output device 106. For example, the program 110 reads and writes data in the main storage unit 102 and the auxiliary storage unit 103.

[0096] The program 110 may be provided after being recorded on a tangible storage medium such as a CD-ROM, a DVD-ROM, or a semiconductor memory. The program 110 may be provided via a communication network as a data signal.

[0097] [Operation and Effect] The control device 10 according to one aspect of the present disclosure is a control device 10 that supports the autonomous operation of the smart grid 2 including a power generation facility that generates power by renewable energy, a first storage battery 6 that controls the voltage of the smart grid 2 to a target value, and a second storage battery 7 that performs charge and discharge according to a charge and discharge command. The control device 10 includes an acquisition unit 11 that acquires the generated power in the smart grid 2 and the consumed power in the smart grid 2, a calculation unit 12 that calculates the differential power that is the difference between the generated power and the consumed power, a determination unit 15 that determines the charge and discharge power of the second storage battery 7 using the differential power, and a control unit 16 that transmits a charge and discharge command indicating the determined charge and discharge power of the second storage battery 7 to the second storage battery 7.

[0098] The control method according to one aspect of the present disclosure is a control method executed by a control device 10 that supports the autonomous operation of a smart grid 2 including a power generation facility that generates power using renewable energy, a first storage battery 6 that controls the voltage of the smart grid 2 to a target value, and a second storage battery 7 that performs charge and discharge according to a charge and discharge command. The control method includes acquiring the generated power within the smart grid 2 and the consumed power within the smart grid 2, calculating a differential power that is the difference between the generated power and the consumed power, determining the charge and discharge power of the second storage battery 7 using the differential power, and transmitting a charge and discharge command indicating the determined charge and discharge power of the second storage battery 7 to the second storage battery 7.

[0099] In the control device 10 and the control method, in the autonomous operation of the smart grid 2, the charge and discharge power of the second storage battery 7 is determined using the differential power that is the difference between the generated power and the consumed power. According to the charge and discharge command indicating the determined charge and discharge power of the second storage battery 7, charge and discharge by the second storage battery 7 is performed. By the charge and discharge of the second storage battery 7, the differential power is eliminated in advance. The voltage fluctuation of the smart grid 2 caused by the differential power is suppressed. As a result, the operation of the first storage battery 6 that controls the voltage of the smart grid 2 to the target value becomes stable. As a result, the autonomous operation of the smart grid 2 can be stably operated.

[0100] An acquisition unit 11 acquires the charge level of the first storage battery 6 and the charge level of the second storage battery 7. The control device 10 further includes a correction unit that calculates correction power for charging and discharging the second storage battery 7 corresponding to the priority order of the charge level of the first storage battery 6 and the charge level of the second storage battery 7. A determination unit 15 determines the charge and discharge power of the second storage battery 7 using the differential power and the correction power. According to such a configuration, the correction power calculated according to the charge level of the first storage battery 6 and the charge level of the second storage battery 7 is reflected in the charge and discharge power of the second storage battery 7. As a result, it becomes easy to control the charge level of the first storage battery 6 and the charge level of the second storage battery 7 by the charge and discharge of the second storage battery 7. As a result, the autonomous operation of the smart grid 2 can be operated more stably.

[0101] The acquisition unit 11 acquires the charge-discharge power of the first storage battery 6. The control device 10 further includes a transfer unit that calculates transfer power for charging and discharging the second storage battery 7 corresponding to part or all of the power value exceeding a predetermined range when the charge-discharge power of the first storage battery 6 exceeds the predetermined range. The determination unit 15 determines the charge-discharge power of the second storage battery 7 using the differential power and the transfer power. According to such a configuration, the transfer power calculated according to the charge-discharge power of the first storage battery 6 exceeding the predetermined range is reflected in the charge-discharge power of the second storage battery 7. That is, part or all of the power value exceeding the predetermined range is transferred to the charge-discharge power of the second storage battery 7. Thereby, it is possible to prevent the charge-discharge power of the first storage battery 6 from becoming excessive, so that the operation of the first storage battery 6 is stabilized. As a result, the autonomous operation of the smart grid 2 can be more stably operated.

[0102] The acquisition unit 11 acquires the charge level of the first storage battery 6 and the charge level of the second storage battery 7. The control device 10 further includes a restriction unit 17 that restricts the power generation power with the consumption power as an upper limit value when the charge level of the first storage battery 6 and the charge level of the second storage battery 7 are each equal to or higher than a predetermined value. According to such a configuration, when the charge level of the first storage battery 6 and the second charge level are equal to or higher than a predetermined value, the power generation power is restricted with the consumption power as an upper limit value. For example, when both the first storage battery 6 and the second storage battery 7 are fully charged, it becomes difficult to continue the autonomous operation. By restricting the power generation power, it is possible to suppress the charge levels of the first storage battery 6 and the second storage battery 7 from being charged to equal to or higher than a predetermined value respectively. As a result, the autonomous operation of the smart grid 2 can be more stably operated.

[0103] [Modification Example] The present disclosure is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the gist thereof. For example, the power generation facility 5 may not be a facility within the smart grid 2.

[0104] In comparing the magnitude relationship between two numerical values, either of the two criteria of "greater than or equal to" and "exceeding (greater than)" may be used, and either of the two criteria of "less than or equal to" and "less than" may be used.

[0105] In the present disclosure, the expression "at least one processor executes a first process, executes a second process,..., executes an nth process." or a corresponding expression is a concept that includes the case where the execution entity (i.e., the processor) of the n processes from the first process to the nth process changes midway. That is, this expression is a concept that includes both the case where all of the n processes are executed by the same processor and the case where the pros change arbitrarily in the n processes.

[0106] The processing procedures of the method executed by at least one processor are not limited to the examples in the above embodiments. For example, some of the above-described steps (processes) may be omitted, or each step may be executed in a different order. In addition, any two or more of the above-described steps may be combined, or a part of the steps may be modified or deleted. Alternatively, other steps may be executed in addition to each of the above steps.

[0107] Hereinafter, the gist of the present disclosure will be shown. [1] A control device for assisting the autonomous operation of a smart grid, comprising a power generation facility that generates power by renewable energy, a first storage battery that controls the voltage of the smart grid to a target value, and a second storage battery that performs charge and discharge according to a charge and discharge command, an acquisition unit that acquires the generated power in the smart grid and the consumed power in the smart grid, a calculation unit that calculates a differential power that is the difference between the generated power and the consumed power, a determination unit that determines the charge and discharge power of the second storage battery using the differential power, a control unit that transmits a charge and discharge command indicating the determined charge and discharge power of the second storage battery to the second storage battery, A control device comprising the above. [2] The acquisition unit acquires the charge level of the first storage battery and the charge level of the second storage battery, The control device further includes a correction unit that calculates correction power for charging and discharging the second storage battery in correspondence with the priority order of the charge level of the first storage battery and the charge level of the second storage battery, The determination unit determines the charge and discharge power of the second storage battery using the differential power and the correction power, The control device of [1]. [3] The acquisition unit acquires the charge and discharge power of the first storage battery, When the charge and discharge power of the first storage battery exceeds a predetermined range, the control device further includes a transfer unit that calculates transfer power for charging and discharging the second storage battery corresponding to a part or all of the power value exceeding the predetermined range, The determination unit determines the charge and discharge power of the second storage battery using the differential power and the transfer power, The control device of [1] or [2]. [4] The acquisition unit acquires the charge level of the first storage battery and the charge level of the second storage battery, When the charge level of the first storage battery and the charge level of the second storage battery are each equal to or greater than a predetermined value, the control device further includes a limiting unit that limits the power generation power using the power consumption as an upper limit value, The control device according to any one of [1] to [3]. [5] A control method executed by a control device that supports autonomous operation of a smart grid, the control device including a power generation facility that generates power from renewable energy, a first storage battery that controls the voltage of the smart grid to a target value, and a second storage battery that charges and discharges according to a charge and discharge command, acquiring the power generation power in the smart grid and the power consumption in the smart grid, calculating differential power that is the difference between the power generation power and the power consumption, determining the charge and discharge power of the second storage battery using the differential power, Transmitting a charge / discharge command indicating the charge / discharge power of the determined second storage battery to the second storage battery; A control method comprising the above.

Explanation of Signs

[0108] 1 Control system 2 Smart grid 3 Power system 4 High-voltage connection board 5 Power generation facility 6 First storage battery 7 Second storage battery 8 Load 9 Instantaneous power meter 10 Control device 11 Acquisition unit 12 Calculation unit 13 Correction unit 14 Transfer unit 15 Determination unit 16 Control unit 17 Limitation unit 51 PCS 52 Solar panel 61 Battery PCS 62 Battery 71 Battery PCS 72 Battery

Claims

1. A control device for assisting the autonomous operation of the smart grid, comprising a power generation facility that generates power using renewable energy, a first storage battery that controls the voltage of the smart grid to a target value, and a second storage battery that charges and discharges according to a charge / discharge command, an acquisition unit that acquires the generated power within the smart grid, the consumed power within the smart grid, the charge level of the first storage battery, and the charge level of the second storage battery, a calculation unit that calculates the differential power, which is the difference between the generated power and the consumed power, a correction unit that calculates correction power for charging and discharging the second storage battery corresponding to the priority order of the charge level of the first storage battery and the charge level of the second storage battery, a determination unit that determines the charge / discharge power of the second storage battery using the differential power and the correction power, a control unit that transmits a charge / discharge command indicating the determined charge / discharge power of the second storage battery to the second storage battery, A control device comprising:

2. The acquisition unit acquires the charge / discharge power of the first storage battery, The control device further comprises a transfer unit that calculates transfer power for charging and discharging the second storage battery corresponding to a part or all of the power value exceeding a predetermined range when the charge / discharge power of the first storage battery exceeds the predetermined range, The determination unit determines the charge / discharge power of the second storage battery using the differential power and the transfer power, The control device according to claim 1.

3. The control device further comprises a limiting unit that limits the generated power with the consumed power as an upper limit value when the charge level of the first storage battery and the charge level of the second storage battery are each equal to or greater than a predetermined value, The control device according to claim 1.

4. A control method executed by a control device for assisting the autonomous operation of a smart grid, the smart grid comprising a power generation facility that generates power using renewable energy, a first storage battery that controls the voltage of the smart grid to a target value, and a second storage battery that charges and discharges according to a charge / discharge command, acquiring the generated power within the smart grid, the consumed power within the smart grid, the charge level of the first storage battery, and the charge level of the second storage battery, calculating the differential power, which is the difference between the generated power and the consumed power, calculating correction power for charging and discharging the second storage battery corresponding to the priority order of the charge level of the first storage battery and the charge level of the second storage battery, Determining the charge and discharge power of the second storage battery using the differential power and the correction power; Transmitting a charge and discharge command indicating the determined charge and discharge power of the second storage battery to the second storage battery; A control method comprising the above.

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