New Synchronization Method for Three-Phase PWM Rectifiers

Abstract – This paper proposes a new open-loop synchronization method for three-phase pwm rectifiers connected to the utility grid. It presents a better performance if compared with other open-loop methods in the presence of grid voltage unbalance and harmonics. Moreover, it reduces the total harmonic distortion (THD) and it does not require complex algorithms such as phase-locked loop (PLL). Simulation results and abacuses are given to demonstrate the good performance of the proposed method if compared to the well known modified synchronous reference frame method. Simulation results from a three-phase PWM rectifier with deadbeat controller are given to demonstrate the performance of the proposed method