FREQUENCY REGULATION METHOD, FREQUENCY REGULATION APPARATUS, AND STORAGE BATTERY SYSTEM
First Claim
1. A frequency regulation method for regulating a frequency of a power system by charging or discharging a storage battery, the method comprising:
- measuring the frequency;
obtaining an SOC of the storage battery;
determining a base-point indicating a value of power to be charged in or discharged from the storage battery when the measured frequency is equal to a predetermined rated frequency;
determining a charge or discharge control variable that is a power value changed from the base-point by an amount corresponding to a frequency deviation that is a difference between the rated frequency and the measured frequency to generate the charge or discharge control variable; and
charging or discharging the storage battery based on the charge or discharge control variable,wherein in the determining of a base-point;
the base-point is determined to be equal to a charging power value when the SOC of the storage battery is within a first range smaller than a first threshold, the charging power value indicating power that is being charged in the storage battery;
the base-point is determined to be equal to a discharging power value when the SOC of the storage battery is within a second range larger than a second threshold larger than the first threshold, the discharging power value indicating power that is being discharged from the storage battery;
the base-point is changed according to the SOC of the storage battery; and
a third rate of change is smaller than a first rate of change and a second rate of change, the first rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within the first range, the second rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within the second range, the third rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within a third range from the first threshold to the second threshold.
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Accused Products
Abstract
Provided is a frequency regulation method for regulating a frequency of a power system so that the frequency approximates to a rated frequency, the method including: measuring the frequency; obtaining an SOC of a storage battery; determining a base-point of power to be charged in or discharged from the storage battery; determining a control variable changed from the base-point by an amount corresponding to a frequency deviation that is a difference between the rated frequency and the measured frequency; and charging or discharging the storage battery based on the control variable, wherein in the determining of a base-point, a third rate of change is smaller than a first rate of change and a second rate of change that are average rates of change in the base-point with respect to the SOC when the SOC is within a first range and a second range, respectively.
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Citations
12 Claims
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1. A frequency regulation method for regulating a frequency of a power system by charging or discharging a storage battery, the method comprising:
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measuring the frequency; obtaining an SOC of the storage battery; determining a base-point indicating a value of power to be charged in or discharged from the storage battery when the measured frequency is equal to a predetermined rated frequency; determining a charge or discharge control variable that is a power value changed from the base-point by an amount corresponding to a frequency deviation that is a difference between the rated frequency and the measured frequency to generate the charge or discharge control variable; and charging or discharging the storage battery based on the charge or discharge control variable, wherein in the determining of a base-point; the base-point is determined to be equal to a charging power value when the SOC of the storage battery is within a first range smaller than a first threshold, the charging power value indicating power that is being charged in the storage battery; the base-point is determined to be equal to a discharging power value when the SOC of the storage battery is within a second range larger than a second threshold larger than the first threshold, the discharging power value indicating power that is being discharged from the storage battery; the base-point is changed according to the SOC of the storage battery; and a third rate of change is smaller than a first rate of change and a second rate of change, the first rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within the first range, the second rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within the second range, the third rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within a third range from the first threshold to the second threshold. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. (canceled)
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11. A frequency regulation apparatus that regulates a frequency of a power system by charging or discharging a storage battery, the apparatus comprising:
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a frequency measuring unit configured to measure the frequency; a charge obtainment unit configured to obtain an SOC of the storage battery; a base-point determining unit configured to determine a base-point indicating a value of power to be charged in or discharged from the storage battery when the measured frequency is equal to a predetermined rated frequency; a control variable determining unit configured to generate a charge or discharge control variable that is a power value changed from the base-point by an amount corresponding to a frequency deviation that is a difference between the rated frequency and the measured frequency; and a charge/discharge control unit configured to charge or discharge the storage battery based on the charge or discharge control variable, wherein the base-point determining unit is configured to; determine the base-point to be equal to a charging power value when the SOC of the storage battery is within a first range smaller than a first threshold, the charging power value indicating power that is being charged in the storage battery; determine the base-point to be equal to a discharging power value when the SOC of the storage battery is within a second range larger than a second threshold larger than the first threshold, the discharging power value indicating power that is being discharged from the storage battery; and change the base-point according to the SOC of the storage battery, and a third rate of change is smaller than a first rate of change and a second rate of change, the first rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within the first range, the second rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within the second range, the third rate of change being an average rate of change in the base-point with respect to the SOC when the SOC is within a third range from the first threshold to the second threshold. - View Dependent Claims (12)
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Specification