DC link voltage controller for three phase vienna rectifier with compensated load current and duty

Abstract

This paper proposes a new dc link voltage controller for a three-phase Vienna rectifier. The proposed method uses load current and duty information to control dc link voltage. The load current affects the capacitor current and makes variation of the output voltage. However, the existing method does not perfectly consider the load current. By considering load current with duty compensation in the proposed method, the transient response is improved by the load variation regardless of the input voltage. The effectiveness of the proposed method is proved by PSIM simulation and experiment, comparing with other control method when the load changed rapidly.