Study of a novel SPWM modulation strategy based on absolute value logic for high frequency link matrix rectifier

摘要

Matrix rectifier is evolved from the traditional three phase to three phase matrix converter, and inherits merits of the traditional matrix converter, so it obtains more attention in recent years. According to transformer, matrix rectifier topology falls into the isolated and non-isolated topology. Now the existed modulation strategy mostly focuses on space vector modulation study and is realized difficultly. This paper adopts isolated matrix rectifier topology and proposes a novel SPWM modulation strategy based on absolute value logic, which can realize unit power factor and DC voltage output, and makes transformer keep voltage-second balance in a high frequency switching period. Experiments are done with DSP and CPLD based on the matrix rectifier platform. Simulations and experiments well prove the validity and feasibility of the proposed modulation strategy.