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A new concept for reconstruction of the input phase currents of a three-phase/switch/level PWM (VIENNA) rectifier based on neutral point current measurement

A novel concept utilizing the neutral point current information which is gained by an AC current sense transformer or a shunt for observer-based continuous reconstruction of the input phase currents of a three-phase/switch/level boost-type PWM (VIENNA) rectifier system is proposed. The basic principle of operation and the dimensioning of the observer circuit which in modified form also could feature an output voltage earth fault detection are discussed in detail. Furthermore, results of a practical application of the system in connection with a highly dynamic ramp comparison mains current control of a 10 kW laboratory model of the VIENNA rectifier are given.