基于矢量合成原理的三相电流型SVPWM整流器多电平技术

Research on Multi-level Technique of Three-phase Current Source SVPWM Rectifier Based on Vector Synthesis Scheme

提出一种适用于三相电流型PWM整流器(CSR)的基于矢量合成技术的SVPWM多电平实现方法。对于N个整流单元并联的大功率PWM整流器,该方法将需要生成的参考电流矢量分组为N份,按矢量合成原理分配给不同的整流器并联单元。这样任意整流器单元都具有相同的SVPWM调制特性和相同的开关频率,整个整流器的等效开关频率为每个整流单元的N倍,且通过扇区矢量分组轮换可以使不同的整流单元达到自动均流。该调制方法不仅保持了传统SVPWM技术的所有优点,且实现简单,其控制策略的复杂程度与并联单元的数目无关,仿真和试验验证了方法的正确性和有效性。

This paper presents a new multi-level technique for three-phase current rectifier （CSR） based on vector synthesis scheme. For a high power rectifier with N parallel units, the referent current vectors are first divided into N groups, and then distribute them to each rectifier unit. So, for every rectifier unit, the modttlation technique is the same with identical switching frequency, and the equivalent frequency of the whole system is N times of each unit. This new technique not only has the advantages of the traditional SVPWM technique, but also its realization is simple. There are not relations between the design complexity and number of parallel units, and it is easy to equalize the DC current of different unit through vector group changing. Simulations and experiments prove that the present technique is fight and effective.