一种单相系统参考电流检测改进算法  

An Improved Algorithm for Reference Current Detection in Single-phase System

作　　者：侯鹏飞 杨跃文 徐海东 HOU Pengfei;YANG Yuewen;XU Haidong(China Railway Fourth Academy Group Southwest Survey and Design Co.,Ltd.,Kunming 650206,China)

机构地区：[1]中铁四院集团西南勘察设计有限公司,云南昆明650206

出　　处：《电工技术》2022年第5期45-47,53,共4页Electric Engineering

摘　　要：针对传统的i_(p)-i_(q)参考电流检测方法受低通滤波器(LPF)滤波性能限制,经LPF滤波后的直流有功分量和无功分量中含有严重的二倍频问题,提出一种消除二倍频的改进算法。首先,分析传统型i_(p)-i_(q)参考电流检测方法的原理,受LPF滤波性能的限制,影响了无功电流、谐波电流的检测精度;其次,分析改进型i_(p)-i_(q)参考电流检测方法的原理,通过构造一个滞后负载电流90°的电流信号,经数学推导计算可完全消除该二倍频,有效抑制了谐波检测误差,同时分析了LPF不同的截止频率对检测精度和响应时间的影响;最后,通过Simulink仿真验证了改进算法可有效提高电流检测精度和动态响应能力。The traditional i_(p)-i_(q) reference current detection method limited by the performance of low pass filter(LPF),and the DC active and reactive components after LPF filtering contain serious double frequency problems.An improved algorithm for eliminating double frequency is proposed to solve the problem.Firstly,the principle of the traditional i_(p)-i_(q) reference current detection method is analyzed.The detection accuracy of reactive current and harmonic current is affected by the limitation of LPF filtering performance.Secondly,the principle of improving the i_(p)-i_(q) reference current detection method is analyzed.A current signal that lags the load current by 90°is constructed.The double frequency can be completely eliminated by mathematical derivation and calculation,which effectively suppresses the harmonic detection error.At the same time,the influence of the different cut-off frequencies of LPF on the detection accuracy and response time is analyzed.Finally,Simulink simulation verifies that the improved algorithm can effectively improve current detection accuracy and dynamic response capability.

关 键 词：i_(p)-i_(q)算法 低通滤波器 谐波电流 截止频率 

分 类 号：TM933.1[电气工程—电力电子与电力传动]