电网电压不对称且谐波畸变时基波电压同步信号的检测  

Synchronization signal detection of fundamental voltage under unbalanced and harmonic distorted grid voltage conditions

作　　者：周鹏[1] 贺益康[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《仪器仪表学报》2010年第1期78-84,共7页Chinese Journal of Scientific Instrument

基　　金：国家863高技术基金(2007AA05Z419)资助项目

摘　　要：本文提出了一种新型电压基波检测方法,通过对采样得到的三相电网电压进行微分运算来构造线性方程组,能够快速准确地计算出畸变电网电压中的正、负序基波分量以及整数次、非整数次谐波分量。在此基波分离方法基础之上,利用改进的软件锁相环技术对电网电压的相位跳变进行补偿,实现了对基波电压正序分量相位的快速跟踪。仿真与实验结果证明本方法实时性好,检测精度高,能为各种电力电子设备在电网故障情况下的运行控制提供依据。This paper proposes a novel grid fundamental voltage detection scheme. By means of solving the linear equations that are gained by differentiating the sampled three-phase grid voltage, it is able to calculate the positive and negative sequence components of the fundamental voltage, and the integral and non-integral harmonics in the unbalanced and distorted grid voltage. Based on the fundamental separation method, an improved software phase locked loop （PLL）, which is designed to compensate the phase angle jump of the grid voltage, is applied to track the phase angle of the positive sequence component in the fundamental wave rapidly. Simulation and experimental results prove that the proposed algorithm has the characteristic of fast dynamic response and high precision, which provides a reliable basis for the control of various power electronic devices under grid faults.

关 键 词：电压畸变 不对称 谐波检测 锁相环 

分 类 号：TM614[电气工程—电力系统及自动化]