Research on influences of sampling errors on performances of three-level PWM rectifier

In order to solve the problem that the sampling errors depress the control performances of pulse width modulation (PWM) rectifier, this paper focuses on a three-level PWM rectifier with voltage oriented control (VOC) strategy, introduces the structure of sampling process, and analyzes the influences of sampling errors on the control performances quantificationally. A software optimization method aimed for restraining the persistent and random sampling errors is then proposed. Simulation and experimental results verified the validity of the analyses and the feasibility of the proposed method. The performances of the rectifier were remarkably improved by using the proposed optimization method.