基于αβ分量滤波直接解耦风电并网锁相环设计  

Direct decoupling wind power grid-connected phase-locked loop design based on αβ component filtering

作　　者：朱建红[1] 黄琼 孟棒棒 ZHU Jianhong;HUANG Qiong;MENG Bangbang(School of Electrical Engineering,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学电气工程学院,江苏南通226019

出　　处：《电力系统保护与控制》2018年第24期135-141,共7页Power System Protection and Control

基　　金：国家自然科学基金面上项目(51377047;61673226);江苏省高等学校自然科学基金(17KJA470006);江苏省高校自然科学研究面上项目(5KJB470014)~~

摘　　要：准确锁定电网电压的频率和相位是风力发电友好并网的重要前提之一。在此领域创新性地引进基于αβ分量滤波的直接解耦三相锁相环技术。首先利用正交信号发生器(QSG)对正序和负序分量进行正交变换和滤除谐波。其次,通过直接解耦法对电压分量(Vα和Vβ)基波正负序分量进行解耦并经过低通滤波器再次滤波,进而得到所需的三相电压正序基波分量。最后,根据设计的理论结果,利用仿真软件分情况对电网故障进行技术应用效果仿真,并与当前正在应用的风电并网系统中的基于双同步解耦坐标变换的锁相环技术进行性能对比。结果表明,基于αβ分量滤波的直接解耦三相锁相环有更好的频率与相位跟踪特性,更有利于风力发电系统电网侧变流器同步并网。Accurately locking the frequency and phase of the grid voltage is one of the important prerequisites for friendly grid-connected wind power. The topic is to introduce a direct decoupling three-phase phase-locked loop technology based on αβ component filtering in this field. Firstly, Orthogonal Signal Generator(QSG) is used to orthogonally transform and filter out harmonics of positive and negative sequence components. Secondly, the positive and negative sequence components of the voltage components(Vα and Vβ) are decoupled by a direct decoupling method and filtered again by a low-pass filter to obtain the required positive sequence fundamental component of the three-phase voltage. Finally, based on the theoretical results of the design, simulation results are used to simulate the technical application effects of the grid faults, and the performance comparison is made with the phase locked loop technology based on the double synchronous decoupling coordinate transformation in the currently applied grid-connected wind power system. The results show that the direct decoupling of the three-phase phase-locked loop based on the αβ component filtering has better frequency and phase tracking characteristics, which is more conducive to grid synchronization of grid-side converters in wind power generation systems.

关 键 词：直接解耦法 正交信号发生器(QSG) 锁相环 风电并网 

分 类 号：TM614[电气工程—电力系统及自动化]