基于改进开关矢量表的三相电压型PWM整流器

Three-phase Voltage Source PWM Rectifier Based on Improved Switching-vector-table

为了提高三相电压型PWM(脉宽调制)整流器直接功率控制方法的动态特性,根据三相电压型PWM整流器的直接功率控制系统数学模型以及18扇区开关矢量表模型,在动态分析直流侧电压瞬时值的基础上,提出了改进的新型18分区开关表。这种新型矢量开关表在直流侧电压不稳定或者遭受大的扰动时,能够根据直流侧电压瞬时值对系统进行有效控制,达到良好的动态控制效果。通过搭建仿真模型并进行实验验证,结果表明基于新型开关表的直接功率控制系统具有更稳定的控制性能。

In order to improve the dynamic characteristics of the DPC(the abbreviation of direct power control)method used in three-phase voltage source PWM(the abbreviation of pulse-width modulation)rectifier,an improved18sectors switching-vector-table according to the mathematical model of three-phase voltage source PWM rectifier DPC system and the model of18sectors switching-vector-table,on the basis of analyzing the instantaneous value ofDC side voltage was proposed.The new switching-vector-table could make a better dynamic performance by effectively controlling the system no matter the DC side voltage was instable or suffered a large disturbance.Simulation and experiment had been carried out by building a DPC system.It indicates that the DPC system with improved switching vector table has a better performance in steady state.