基于二电平矢量拓展的通用多电平控制策略

选择电平作为参考对象,研究了对电平数和相数都具有通用性的多电平控制策略,提出了二电平矢量拓展法,并进一步分析解决了新控制策略中的电平离散意义、整余分量分解、二电平分析、桥臂开关分组等关键问题.该控制策略物理意义明晰、实现简易,控制策略的复杂度不随电平数或相数的增加而增大,对于系统电平数及相数的变化都具有很好的通用性.最后,在Matlab环境中搭建了三相五电平逆变系统模型,仿真结果证明了该控制策略简单可行.

Universal multilevel control strategy based extended two-level space vector modulation

Universal multilevel strategy to converters with different levels and/or phases was researched by selecting the voltage level as research object.A novel universal multilevel scheme,extended two-level space vector modulation(ETSVM) was proposed.Some key problems such as discreteness of the voltage level,decomposition of integral and fractional parts of the reference voltage level,two-level analysis,switch groups on one bridge,and so on were discussed in the new ETSVM scheme.The complexity of this scheme is nearly same despite of various levels and/or phases.Simulation of a 3-phase 5-level model in Matlab exhibited the feasibility and simplicity of ETSVM.