Control Device, Power Conversion Device, And Control Method

Abstract: A control device according to one embodiment is for a power conversion device combining a converter for converting AC power to DC power and an inverter for converting DC power to AC power. The control device comprises a DC voltage controller, a compensation calculator, a controller, and a stabilization controller. The DC voltage controller performs a proportional operation and an integral operation on a DC voltage deviation, which is the deviation between a DC voltage detection value related to DC voltage on the DC side of the converter and a DC voltage reference on the DC side, and generates an output value using the results of the proportional operation and the integral operation. The compensation calculator adjusts a compensation amount for suppressing fluctuation of the DC voltage by using a request output value of the inverter. The control unit controls the conversion amount of the converter using a calculation result that is based on the generated output value and the adjusted compensation amount. When a predetermined condition related to the size of the DC voltage deviation and the result of the integral operation is satisfied, the stabilization controller changes the result of the integral operation to a value smaller than the absolute value of the result of the integral operation.

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