CDSC在单相电网同步锁相技术中的应用  

The Application of Cascade Signal Delay Cancellation in Single Phase Grid Synchronization Technology

作　　者：孙立[1] 杨贵营[1] 庄圣贤[1] 李少阶 严肃[1] 

机构地区：[1]西南交通大学电气工程学院,成都610031

出　　处：《电测与仪表》2014年第19期104-109,共6页Electrical Measurement & Instrumentation

摘　　要：针对非理想电网环境下单相锁相环同步问题,文章提出一种基于级联信号延时消除(CDSC)的单相锁相环。研究中首先对仅有单相输入下的坐标变换结果进行分析,得出各种非理想电网状态下单相信号输入的同步旋转坐标变换的输出特性。结合带有频率反馈环路的级联信号延时消除法能够快速有效的抑制如直流分量、谐波、相位突变等非理想电网环境给同步参考坐标变换的输出带来不良影响,从而达到准确跟踪单相电网基波电压幅值、相位和频率自适应的目的。该方法无需构造单相电压信号的虚拟正交信号,算法简单且硬件上容易实现。仿真和实验结果验证所提锁相环在非理想电网环境下可以快速准确的跟踪输入电网电压信号的相位、频率和幅值,同时满足系统的稳定性。A kind of single phase lock loop based on cascade signal delay cancellation has been proposed in this paper to deal with the single phase grid synchronization under non- ideal grid environment. Firstly,the coordinate transformation results with only single phase signal is considered as the input signal has been analyzed,and the output features of synchronous rotation coordinate transformation with single phase signal as the input in every non- ideal grid environment will be obtained. The proposed method,combining the cascade signal delay elimination method with frequency feedback loop,will suppress the effect of non- ideal grid environment,like DC component,harmonic component,phase hits and so on,on synchronous reference coordinate transformation quickly and effectively,so as to track the voltage amplitude,phase of the single grid and frequency self- adaption accurately. Moreover,this method does not ask for virtual orthogonal signal construction,which will be implemented simply by hardware. The effectiveness of the proposed method is verified by simulation and experiment results.

关 键 词：单相锁相环 级联信号延时消除 频率反馈环 电网同步 

分 类 号：TM933[电气工程—电力电子与电力传动]