基于多电平逆变器通用组合拓扑结构的调制策略研究

Research on Modulation Strategies Based on Multilevel Inverter Universal Hybrid Structure

以级联型多电平逆变器拓扑结构为基础,提出了一种多电平逆变器通用组合拓扑结构的构成原则,对多电平逆变器拓扑结构的研究进行了统一。根据该通用拓扑结构所提供的自由度,构造出了几种新型的组合拓扑结构。同时,基于传统的应用于多电平逆变器的多载波SPWM调制策略,提出了对应于组合拓扑结构的组合调制策略,根据所提出的组合调制策略,很自然地产生了一种基于移相理论的SVPWM。仿真及实验结果验证了组合拓扑结构及组合调制策略的有效性,为多电平逆变器组合拓扑结构的实际应用奠定了基础。

Based on multi-module-cascaded inverter topology, a universal hybrid multilevel inverter structure is introduced in this paper and the research on multilevel inverter structure is unified. According to the free degree of this universal topology, several new hybrid topologies are constructed. At the same time, based on conventional modulation strategies--multi-carrier SPWM （Sinusoidal Pulse Width Modulation）, hybrid modulation strategies are introduced. Corresponding to hybrid topologies, a multilevel SVPWM （Space Vector Pulse Width Modulation） technique based on phase-shift theory is naturally produced. The simulation and experiment results prove the validity of hybrid topologies and corresponding modulation strategies, which lays the foundation of practical application of hybrid multilevel inverter structure.