Single sensor current control of a three-phase voltage-source PWM converter using predictive state observer

This paper proposes a control method for a three-phase voltage-source PWM converter with only a single current sensor in the DC link. A PWM modulation strategy for reconstructing three-phase currents from the DC link current is given. A predictive current controller for the voltage-source PWM converter is presented which uses a space vector modulation strategy to determine the switching instants of the voltage-source PWM converter. This feedback control employs a state observer to ensure reliable feedback signals under all operating conditions. Compensation of the 2 sample delays are also incorporated. Therefore, in this paper, single sensor current control using a predictive state observer for a three-phase PWM power converter is discussed and investigated experimentally.