基于模糊PI控制的SVPWM整流器直接功率控制研究  

Research on direct power control of SVPWM rectifier based on fuzzy PI control

作　　者：苏宏升[1] 景利学[1] 袁超[1] 朱俊敏[1] 

机构地区：[1]兰州交通大学自动化与电气工程学院,甘肃兰州730070

出　　处：《电源技术》2012年第10期1524-1526,共3页Chinese Journal of Power Sources

摘　　要：分析了PWM整流器虚拟磁链直接功率控制(VFDPC)的工作原理,得出了基于虚拟磁链观测的瞬时功率估算式。针对虚拟磁链观测中存在的因积分初值选取不当造成的直流偏移问题,设计了由两个高通滤波器级联构成的二阶环节代替纯积分器以滤除直流分量。为提高PWM整流器直流电压稳定性,在电压外环设计了模糊PI控制器。仿真结果表明,与传统DPC方案相比,基于模糊PI控制的空间矢量脉宽调制(SVPWM)整流器直接功率控制系统直流侧电压稳定,动态性能更好。The principle of VFDPC（virtual flux direct power control） for PWM rectifier was analyzed and the instantaneous power estimating equations based on virtual flux observer were obtained.There was DC voltage shifts problem caused by improper selection of integral initial value in virtual flux observer.The pure integral link was replaced by a second order link composed of two high-pass filter to filtering out the DC current.A fuzzy PI controller was designed in the voltage loop in order to improve the DC voltage stability of PWM rectifier.The simulation results show that,the PWM rectifier VFDPC system based on fuzzy PI control have the advantages of more stable DC side voltage and better dynamic performance in start-up phase compared with the traditional DPC system.

关 键 词：PWM整流器 直接功率控制 虚拟磁链 模糊PI控制 

分 类 号：TM461[电气工程—电器]