Abstract
Based on a multi-module-cascaded multilevel inverter structure for the optimization of harmonics, this paper introduces a horizontal phase-shifting sinusoidal pulse width modulation (SPWM) strategy applied to multi-module-cascaded inverter, and at the same time, based on Digital Signal Processor (DSP) and Complex Programmable Logic Device (CPLD), this paper also presents a digital algorithm for horizontal phase-shifting SPWM modulation, which has solved the problem of the exactly lock of each triangular carrier phase in the multi-module-cascaded system. The simulation and experimental results have proven the method proposed correct.
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