基于改进自适应滤波器的电网同步技术  

Grid Synchronization Method Based on Improved Adaptive Filter

作　　者：王怀宝[1] 沈虹[1] 张莹[1] 郭小强[1] 孙孝峰[1] 

机构地区：[1]燕山大学电力电子节能与传动控制河北省重点实验室,秦皇岛066004

出　　处：《高电压技术》2014年第11期3636-3641,共6页High Voltage Engineering

基　　金：河北省教育厅优秀青年基金(YQ2014010);中国博士后科学基金(2014M551050);高等学校博士学科点专项科研基金(20131333120016)~~

摘　　要：电网同步是风力发电系统实现故障穿越的必备功能,为了实现快速准确的电网同步,提出了一种基于改进自适应滤波器的电网同步方法。通过数学方程表达式揭示了改进自适应滤波器的原理,利用对称分量法计算电网电压的正序分量和负序分量,对频率自适应环节进行了分析和设计。基于Matlab/Simulink仿真,对传统二阶广义积分器方法和该方法进行了对比研究,结果表明:和传统方法相比,该文提出方法的正负分量序误差幅度<0.1%,频率误差<0.08 Hz,验证了该方法的有效性。所提方法可以解决实际应用中电网电压不平衡、谐波和直流偏置情况下电网同步误差的问题,Grid synchronization is a mandatory function for fault transmitting in wind power systems. In order to achieve fast and accurate grid synchronization, we proposed a grid synchronization method based on an improved adaptive filter. Principle of the improved adaptive filter is demonstrated by mathematical equations. We estimated the positive and negative sequences of grid voltage by the symmetrical component method, and analyzed and designed the frequency adaptive loop for the filter. Then the proposed method was compared with the conventional method, which uses second order generalized integrators, through simulations in Matlab/Simulink. The results indicate that, compared with the conventional method, the proposed method is more accurate, which has the errors of positive/negative sequence amplitudes less than 0.1% performance, and frequency error less than 0.08 Hz. Hence, the method can deal with the problem of the grid synchronization errors resulted from unbalanced, distorted, or offset grid voltage.

关 键 词：自适应滤波器 二阶广义积分器 瞬时对称分量 基波正负序分量 故障穿越 电网同步 

分 类 号：TM614[电气工程—电力系统及自动化] TN713[电子电信—电路与系统]