Power storage apparatus of power generation system and operating method of power storage apparatus

An operating method of a power storage apparatus installed in connection with a power generation system using natural energy having a generation power which changes with time, the power storage apparatus mitigating changes to the generation power, where the power storage apparatus has a control unit and a plurality of electricity storage devices, the plurality of electricity storage devices being composed of converters and secondary batteries, the operating method comprising the steps of:

• detecting a charge rate of the secondary batteries of the electricity storage devices by a charge rate calculator included in the converters,
• calculating a power station output target value using power station output target value calculators included in the control unit, and calculating and outputting a charge and discharge power instruction for executing charging and discharging by each of the plurality of electricity storage devices by a charge and discharge power calculator on the basis of the power station output target value;
• calculating a correction value of the charge and discharge power instruction calculated by the charge and discharge power calculator using a charge rate management charge and discharge instruction calculator included in the control unit on the basis of a detected charge rate of the secondary batteries and a charge rate target value;
• calculating a correction value of the charge rate target value of the power storage apparatus using a deterioration index calculator included in the control unit according to one of characteristics and an operation history of the secondary batteries and instructing a charge rate target value calculator of the correction value of the charge rate target value, and
• controlling the charging and discharging power of the secondary batteries by the converters so as to follow the charge and discharge power instruction from the control unit, and mitigating changes to a combined power formed by adding the power outputted from the power generation system and the charge and discharge power outputted from the power storage apparatus.

An operating method of a power storage apparatus where the power storage apparatus is installed in connection with a power generation system using natural energy having a generation power which changes with time, the power storage apparatus mitigating changes to the generation power, where the power storage apparatus has a control unit and a plurality of electricity storage devices and the plurality of electricity storage devices are composed of converters and secondary batteries, the operating method comprising the steps of:

• calculating a power station output target value using a power station output target value calculator included in the control unit,
• calculating a change relief charge and discharge instruction to be charged and discharged by each of the plurality of electricity storage devices by a charge and discharge power calculator included in the control unit on the basis of the power station output target value;
• inputting a charge rate target value of the plurality of electricity storage devices by an external input device;
• calculating a charge rate of the secondary batteries by a charge rate calculator included in the converters;
• and
• correcting the change relief charge and discharge instruction on the basis of the charge rate target value and the charge rate of the secondary batteries calculated by the charge rate calculator included in the converters, calculating a correction value of the charge and discharge power instruction, and instructing the correction value of the charge and discharge power instruction to each electricity storage device.