三相变流器在不平衡电网下的无电压传感器控制  

Voltage-sensor-less Control of Three-phase Converter Under Unbalanced Grid Voltage

作　　者：李杰[1] 宋文祥[2] LI Jie;SONG Wenxiang(School of Information and Engineering,Shanghai Open University,Shanghai 200433,China;School of Mechatronics Engineering and Automation,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海开放大学信息与工程学院,上海200433 [2]上海大学机电工程与自动化学院,上海200072

出　　处：《电气传动》2016年第8期75-80,共6页Electric Drive

基　　金：国家自然科学基金(51377102)

摘　　要：在三相不平衡电网中,三相PWM变流器的无电网电压传感器控制将会遇到母线电压含有二次谐波、并网电流含负序电流和电网电压同步信号畸变等问题。针对这些问题,将虚拟磁链技术应用到三相PWM变流器的无电网电压传感器控制中,结合二阶广义积分器SOGI(second-order generalized integrator)进行正、负序同步信号的获取,基于正、负序双同步旋转坐标系建立了直接电流控制系统。仿真结果证实了理论分析的正确性和控制策略的有效性。In unbalanced grid conditions,the three-phase PWM converter meets with some questions,such as the second harmonic in the dc-link voltage,the negative sequence currents and grid voltage synchronization signal distortion and so on. According to the problems,the direct current control system based on positive and negative sequence double synchronous rotating coordinate system was established. And combining the virtual flux and a second-order generalized integrator,the estimation of the virtual flux and the separation of positive and negative sequence components was realized well. Simulation results are presented to verify the correctness of theoretical analysis and the validity of control method.

关 键 词：三相PWM变流器 不平衡电网 无电网电压传感器控制 虚拟磁链 

分 类 号：TM614[电气工程—电力系统及自动化]