Research on Realizing Space Vector Equivalent Modulation Output by Dual Carrier Modulation of Current Source Inverter

Abstract

In order to achieve equivalent modulation of the multilevel current converter, based on the topology of three-phase multilevel current-source converters, this article presents a method to realize the output characteristic of space vector pulsewidth modulation (SVPWM) with carrier-based PWM, which can be applied in the topologies from five-level to n-level space vector modulation strategy. Different from the strategies of traditional unity theory, the proposed method analyzes the relationship directly according to the switching states of SVPWM in three-phase multilevel current-source converters. By constructing the equivalent relationship between the output level of each phase and switching states, the carriers can control the working status of the switches directly. In addition, this method is generalized to the topologies and modulation strategies under n-level, which fully reflects the correctness and universality of the proposed method. Finally, the results of simulation and experiment verify the correction of the method.