电工技术学报2011，Vol.26Issue(9)：217-222,6.
电网电压正负序分量快速检测算法
Fast Detection Algorithm of Grid Voltage Positive and Negative Sequence Components
摘要
Abstract
One of the important issues in the operation of three phase grid-connected converters is fast and precise detection of fundamental-frequency positive and negative sequence components present in three phase input voltages.A new detection algorithm based on complex least squares is proposed.This algorithm can detect amplitude and phase of grid voltage positive and negative sequence accurately and rapidly when the voltage contains high order harmonics and random noise.Because of the assumption that the frequency is known,the algorithm can＇t track grid frequency variation.Kalman filter has many similarities with least squares,and it contains state equation and output equation which can estimate more grid information.Based on the above ideas,this paper proposes an improved algorithm which not only separates positive and negative sequence components,but also detects frequency variation.The simulation and experimental results verify the correctness and validity of the algorithm.关键词
电压故障检测/复最小二乘/扩展复卡尔曼滤波/协方差复位Key words
Voltage fault detection/complex least squares/extended complex Kalman filter/covariance resetting分类
信息技术与安全科学引用本文复制引用
刘义成,张学广,景卉,徐殿国..电网电压正负序分量快速检测算法[J].电工技术学报,2011,26(9):217-222,6.基金项目
国家自然科学基金 （）
台达环境与教育基金会《电力电子科教发展计划》重点资助项目 （）
