PWM整流器功率脉动最小化方法的研究  

Studies on Power Ripple Minimization of PWM Rectifiers

作　　者：张永昌[1] 谢伟[1] 李正熙[1] 

机构地区：[1]北京市电力电子与电气传动工程研究中心(北方工业大学),北京市石景山区100144

出　　处：《中国电机工程学报》2013年第18期57-64,15,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51207003)~~

摘　　要：传统的单矢量直接功率控制在每个控制周期只发一个电压矢量,存在功率脉动大和开关频率不固定等缺点。在分析脉宽调制(pulse width modulation,PWM)整流器预测功率模型的基础上,提出一种基于二矢量的新型直接功率控制策略,即在一个控制周期内同时施加一个非零矢量和一个零矢量。按照单个控制周期内有功和无功的脉动有效值最小为原则,通过数学推导解析求得该非零矢量的最优作用时间。该方法可在维持传统单矢量直接功率控制动态性能的基础上显著改善系统的稳态性能,且简单容易实现,其有效性通过仿真和实验结果得到了证实。In the conventional single-vector-based direct power control（DPC）,only one voltage vector is applied during one control period,which brings the drawbacks of high power ripple and variable switching frequency,etc.This paper firstly analyzes the predictive power model of PWM rectifiers,and then proposes a novel two-vectors-based DPC method,which applies one non-zero vector and one zero vector during one control period.Based on the principle of power ripple RMS minimization during one control period,the optimal duration of the non-zero vector can be analytically obtained.Simulation and experimental results prove that the proposed method can achieve significant steady state performance improvement while maintaining the dynamic response of conventional single-vector-based DPC,and is easy to implement.

关 键 词：脉宽调制整流器 直接功率控制 脉动最小化 

分 类 号：TM46[电气工程—电器]