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yi zhong zheng fu xu fen li suo xiang huan ji qi zai bing wang xing feng li fa dian xi tong zhong de ying yong
Author(s): 
Pages: 181-186
Year: Issue:  8
Journal: Transactions of China Electrotechnical Society

Keyword:  Phase lock loop(PLL)positive and negative-sequence detectiondelayed signal cancellation(DSC)wind power systemlow voltage ride through(LVRT);
Abstract: 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。
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