基于新型虚拟磁链观测的PWM整流器矢量控制  

Vector Control of PWM Rectifier Based on New Virtual-Flux-Linkage Observer

作　　者：许磊磊[1] 卜文绍[2] 

机构地区：[1]河南科技大学电气工程学院,河南洛阳471023 [2]河南科技大学信息工程学院,河南洛阳471023

出　　处：《控制工程》2016年第1期24-29,共6页Control Engineering of China

基　　金：国家自然科学基金项目(51277053);河南省国际科技合作项目(114300510029)

摘　　要：为了提高PWM整流器的虚拟磁链定向矢量控制的准确性,提出了一种新型虚拟磁链观测器,将3个一阶低通滤波器级联来代替纯积分器,以避免纯积分器带来的积分初值问题和直流漂移问题,实现虚拟磁链和电网电压的准确观测;采用SVPWM调制模块,给出了三相PWM整流器的无电网电压传感器控制系统结构。仿真结果表明,无论在整流或逆变状态,均能准确观测出虚拟磁链的幅值和相位,系统能在无网压传感器的条件下实现可靠运行;所给估算方法和控制策略是有效的、可行的。In order to improve the accuracy of the virtual flux oriented vector control of PWM rectifier, a novel improved virtual flux observer is proposed. To avoid problems of initial integral value and DC drift problem, and to achieve the accurate observation of virtual flux-linkage and grid voltage, three first order low-pass filters are cascaded to displace the pure integrator. Using SVPWM modulation module, the grid voltage sensorless control system of three-phase PWM rectifier is given. The simulation results show that either in the rectifying status or in inverting status, the amplitude and phase of virtual flux-linkage can be observed accurately, or the control system of PWM rectifier can operate reliably without the grid voltage sensors; the given estimation method of virtual flux-linkage and the control strategy are effective and feasible.

关 键 词：PWM整流器 无网压传感器 改进型虚拟磁链观测器 矢量控制 仿真分析 

分 类 号：TM46[电气工程—电器]