Power control device and power control method

Abstract

[Problem] To provide a power control device and a power control method that use a storage battery to improve the capacity factor of a solar cell. [Solution] A power control device that transmits a power generation command value, which is the upper limit of power generation, to a power conditioner (PCS), and transmits a charging command value and a discharging command value to a storage battery. The power control device is configured to: acquire generated power from the PCS; acquire charged / discharged state information from the storage battery; acquire a control schedule from a server; when power to be controlled is defined as (generated power + discharged power - charged power), set the power to be controlled in agreement with power supplied to a power system on the basis of the control schedule, to calculate the power generation command value, the charging command value, and the discharging command value; and transmit the command values to the PCS and / or the storage battery. When the value of potential power is larger than the power generation command value, in the calculation, each command value is calculated such that the power generation command value is as large as possible within the range of the value of the potential power or smaller.

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, wherein the power control device is configured to perform the following steps: a power generation power acquisition step of acquiring power generated from the power conditioner; a storage battery information acquisition step of acquiring charge / discharge status information from the storage battery; an acquisition step of acquiring a control schedule from a server; a command value calculation step of calculating the power generation command value, the charge command value and the discharge command value by setting the power to match the power supplied to the power system based on the control schedule, when the power to be controlled is calculated as (the power generated + the discharge power of the storage battery - the charge power of the storage battery), using the acquired information; and a command value transmission step of transmitting only the command values ​​that have been changed, and / or all the calculated command values, to the power conditioner and / or the storage battery, wherein the power control device is configured to perform the following steps: a power generation power acquisition step of the power conditioner that is calculated from solar irradiance, the panel capacity of the solar cell connected to the power conditioner, and the rated capacity of the power conditioner, 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 power control device according to claim 1, wherein 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.

3. The power control device according to claim 1, wherein 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 lower limit set for each, the command values ​​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.

4. The power control device according to claim 4, wherein 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.

5. The power control device according to claim 1, comprising a processor and 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, wherein the power control device is configured to perform the following steps: a power generation acquisition step of acquiring power generation from the power conditioner; a battery information acquisition step of acquiring charge / discharge status information from the storage battery; an acquisition step of acquiring a control schedule from a server; a power consumption acquisition step of acquiring the power consumption of the load; a command value calculation step of calculating the power generation command value, the charge command value and the discharge command value by setting the power to be controlled to match the power supplied to the power system based on the control schedule, when the power calculated as (power generation + battery discharge power - battery charge power) is the power to be controlled, using the acquired information; and a command value transmission step of transmitting only the command values ​​that have been changed, and / or all the calculated command values, to the power conditioner and / or the storage battery. A power control device in which, when the potential power generated by the power conditioner is determined from the solar radiation intensity, the panel capacity of the solar cell 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, and when the value of the potential power is greater than the power generation command value, the command value calculation step calculates each 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.

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, the power control device being configured to perform: a power generation acquisition step of acquiring power generation from the power conditioner; a battery information acquisition step of acquiring charge / discharge status information from the storage battery; a power consumption acquisition step of acquiring the power consumption value of the load; a command value calculation step of calculating the power generation command value, the charge command value and the discharge command value by setting the difference between the upper limit of the controlled power and the power consumption to be a function of the power consumption, using the acquired information, when the power obtained by (the power generation + the discharge power of the storage battery - the charge power of the storage battery) is the power to be controlled; and a command value transmission step of transmitting only the command values ​​that have been changed, and / or all the calculated command values, to the power conditioner and / or the storage 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, wherein the power control device is configured to perform the following steps: a power generation acquisition step of acquiring power generated from the power conditioner; a battery information acquisition step of acquiring charge / discharge status information from the storage battery; a power consumption acquisition step of acquiring the value of the power consumption of the load; a command value calculation step of calculating the power generation command value, the charge command value and the discharge command value by setting the difference between the upper limit of the controlled power and the power consumption to be a function of the power consumption, when the power obtained by (the power generation + the discharge power of the storage battery - the charge power of the storage battery) is the power to be controlled, using the acquired information; and a command value transmission step of transmitting only the command values ​​that have been changed, and / or all the calculated command values, to the power conditioner and / or the storage battery, wherein the power control device is configured to perform the following steps: a power generation acquisition step of the power conditioner that is obtained from solar irradiance, the panel capacity of the solar cell connected to the power conditioner, and the rated capacity of the power conditioner, 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 power consumption and the upper limit of the power to be controlled is set as the target power purchase value, the power generation command value, the discharge command value, and the charge command value are calculated in the command value calculation step such that the power generation command value is less than or equal to the value of the potential power, and the value of the power purchased from the commercial power source is greater than or equal to the target power purchase value and as small as possible.

11. The power control device according to claim 10, wherein, when the value of purchased electricity is equal to the target value of purchased electricity and the value of potential electricity is greater than the power generation command value, the power control device calculates each 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 potential electricity while maintaining the value of purchased electricity to be equal to the target value of purchased electricity.

12. In the command value calculation step, when 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, the power control device according to claim 10 calculates each command value such that the value of purchased electricity becomes equal to the target value of purchased electricity and the generation command value becomes as large as possible within a range less than or equal to the value of potential electricity.

13. In the command value calculation step, if the value of purchased power is greater than the target power purchase value and the value of potential power is equal to the power generation command value, the power control device according to claim 10, which increases the discharge power of the storage battery and / or decreases the charging power of the storage battery to calculate each command value such that the value of purchased power is greater than or equal to the target power purchase value and as small as possible.

14. The power control device according to claim 10, wherein in the command value calculation step, when the value of purchased electricity is smaller than the target value of purchased electricity, the power control device calculates a discharge command value or a charge command value that reduces the discharge power of the storage battery and / or increases the charge power of the storage battery so that the value of purchased electricity becomes equal to the target value of purchased electricity.

15. The power control device according to claim 14, wherein in the command value calculation step, if there is no remaining charging capacity of the storage battery, the generated power is reduced and each command value is calculated so that the target power purchase value and the power purchase value become equal.

16. The power control device according to claim 9, wherein the function is a linear function.

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, the method comprising: a power generation acquisition step of acquiring power generation from the power conditioner; a battery information acquisition step of acquiring charge / discharge status information from the storage battery; an acquisition step of acquiring a control schedule from a server; a command value calculation step of calculating the power generation command value, the charge command value and the discharge command value by setting the power to match the power supplied to the power system based on the control schedule, when the power to be controlled is calculated as (power generation + discharge power of the storage battery - charge power of the storage battery), using the acquired information; and a command value transmission step of transmitting only the command values ​​that have been changed, and / or all the calculated command values, to the power conditioner and / or the storage battery, wherein the potential power generation of the power conditioner, which is determined from the solar irradiance, the panel capacity of the solar cell connected to the power conditioner, and the rated capacity of the power conditioner, is used as the potential power generation. 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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