Abstract：Due to the omission of AC current sensors, the AC current needs to be reconstructed through a certain algorithm in the control strategy without AC current sensor. The current reconstruction usually is based on space vector pulse width modulation ( SVPWM) , and the problem of this scheme is that the reconstructed current waveform appears distortion near the sector switch area. A novel current reconstruction processing strategy which combines coordinate transformation and low pass filtering ( LPF) is proposed, in which the reconstructed current is carried out coordinate conversion and low pass filtering. This reconstruction strategy can solve the problem of reconstruction current distortion, simplify the control system. The simulation and experimental results verify the correctness of the current reconstruction strategy.

Keyword：PWM rectifier;current reconstruction;DC filter;coordinate transformation;