Voltage Control Apparatus And Voltage Control Method

Abstract: This voltage control apparatus is provided with: an inverter that converts DC power outputted from a battery into AC power and that supplies the AC power to a power system; and a control device that is connected to the inverter. The control device, when a voltage drop of the output voltage of the inverter is equal to or higher than a threshold due to fluctuation of the AC voltage of the power system, executes: a process for calculating a virtual impedance by using a variable including an active voltage command value and a reactive voltage command value calculated by a voltage command value, and an active current command value and a reactive current command value calculated by the output voltage of the inverter and the voltage command value; a process for calculating a virtual active voltage and a virtual reactive voltage by multiplying, by the virtual impedance, each of the active current and the reactive current calculated by the output current of the inverter; and a process for controlling the voltage so that the active current and the reactive current respectively approach the active current command value and the reactive current command value required for the power system, on the basis of the virtual active voltage and the virtual reactive voltage.

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