一种正负序分离锁相环及其在并网型风力发电系统中的应用  

A Positive and Negative-Sequence Detection PLL and Its Application in Wind Power Generation System

作　　者：陈明亮[1] 肖飞[1] 刘勇[1] 王颢雄 李泉峰[3] 

机构地区：[1]海军工程大学电力电子技术研究所,武汉430033 [2]大全集团凯帆新能源有限公司,扬中212200 [3]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2013年第8期181-186,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50737004);国家重点基础研究发展计划(2012CB215103)资助项目

摘　　要：基于对三相电量进行正负序分离的软件锁相环,采用了正负序级联延时信号消除法,能够实现对三相电压电流基波正负序分量在同步旋转坐标下的快速提取,并且通过选择不同的参数,可以滤除指定次数谐波的干扰。该方法无需采用滤波器,从而具备了良好的动态性能。将该锁相环应用在并网型风力发电系统中,可为系统低电压穿越功能的实现提供快速准确的电网电压信息以进行正负序控制。仿真和实验均表明该方法能够快速有效地提取三相不对称且畸变情况下的频率、相位与正负序分量,并且同时具备稳态精确性和动态快速性,为三相并网型风力发电变流器在电网发生跌落及谐波畸变时的良好运行控制提供保障。This paper proposes a novel phase lock loop（PLL） scheme based on positive and negative-sequence cascaded delayed signal cancellation method. The positive and negative sequence components of the fundamental voltage or current in three phase system can be calculated with fast transient response, and any specified harmonic can be eliminated by choosing appropriate parameters. No low-pass filters are needed, and perfect dynamical performance can be achieved. The PLL is used in low voltage ride through control in grid-connected wind power system to provide fast and accurate grid information. Simulation and experimental results show that the frequency, phase angle and positive and negative sequence components can be obtained with fast dynamic response and high precision. The method provides a reliable basis for the control of grid connected PWM converters under asymmetrically distorted three-phase voltages in wind power systems.

关 键 词：锁相环 正负序分离 延时信号消除 风力发电 低电压穿越 

分 类 号：TM461[电气工程—电器]