不平衡工况下电网电压序分量快速提取方法  

Fast Extraction Method of Grid Voltage Sequence Components in Unbalanced Conditions

作　　者：熊连松 修连成 康志亮 宋汉梁 刘娣[1] 许昭[2] XIONG Liansong;XIU Liancheng;KANG Zhiliang;SONG Hanliang;LIU Di;XU Zhao(School of Automation,Nanjing Institute of Technology,Nanjing 211167,China;Department of Electrical Engineering,Hong Kong Polytechnic University,Hong Kong 999077,China;School of Mechanical and Electrical Engineering,Sichuan Agricultural University,Ya'an 625000,China)

机构地区：[1]南京工程学院自动化学院,江苏省南京市211167 [2]香港理工大学电机工程系,香港999077 [3]四川农业大学机电学院,四川省雅安市625000

出　　处：《电力系统自动化》2019年第11期144-151,共8页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51707091);江苏省配电网智能技术与装备协同创新中心开放基金资助项目(XTCX201711)~~

摘　　要：快速准确地获取三相不平衡电网电压的序分量(即正、负、零序分量)是实现高性能并网逆变器控制的基本要求。文中提出了一种实用的瞬时序分量提取方法,可提高不平衡电网电压序分量的提取速度。首先,使用虚拟正交信号构建法和单相锁相运算获得虚拟三相电压相量,之后利用对称分量法和单相锁相逆运算,即可快速获得序分量的幅值和实时相位。该方法仅需电网电压及其虚拟正交信号,即可直接获得瞬时电压序分量,无需闭环检测方法中的参数设计和调试过程,且计算精度能够满足工程要求。通过MATLAB/Simulink实时仿真平台验证了该方法的正确性。The basic requirement for implementing high-performance grid-connected inverter control is to quickly and accurately obtain the sequence components (i.e.,positive,negative and zero sequence components) of the three-phase unbalanced grid voltage.This paper proposes a practical extraction method of sequence components,and it can significantly improve the extraction speed of voltage sequence components in unbalanced grid.The method first uses the virtual quadrature signal construction method and the single-phase locked operation to obtain the virtual three-phase voltage phasor.Next,the symmetrical component method and the single-phase-locked inverse operation can be used to quickly obtain the amplitude and real-time phase of the sequence component.The method only needs the grid voltage and its virtual orthogonal signal to calculate the amplitude and phase of the voltage sequence component,and the method does not require parameter design and debugging process.Meanwhile,its calculation accuracy can meet engineering requirements.The correctness of the method is verified by MATLAB/Simulink real-time simulation platform.

关 键 词：不平衡电网 序分量 对称分量法 坐标变换 虚拟正交信号 

分 类 号：TM732[电气工程—电力系统及自动化]