基于自适应增益LMS算法的谐波检测新方法.pdfVIP

学兔兔 第51卷 第25期 电测与仪表 VO1．51 No．10 2014年 5月25日 Electricai Measurement Instrumentation May．10。2014 基于自适应增益LMS算法的谐波检测新方法 刘建华，周万鹏，钱红稳，赵世杰 (中国矿业大学信息与电气工程学院，江苏徐州221116) 摘要：有源电力滤波器(APF)需要对谐波电流进行检测，快速准确的谐波检测方法能够提高有源电力滤波器的 补偿性能。本文基于最小均方算法，改进了谐波检测算法，该算法从减小集平均代价函数出发，基于自适应增 益，推导出新的步长迭代公式；从检测算法的快速准确性出发，通过Matlab仿真和DSP实验可以看出该算法得 到的基波幅值误差为0．2％，迭代响应时间为0．01 S，不仅达到了很高的检测精度，而且能在半个基波周期内达 到稳定，验证了新检测算法的准确性和快速性。 关键词：LMS算法；谐波检测；集平均代价函数；自适应增益 中图分类号：TM933 文献标识码：B 文章编号：1001—1390(2014)10—0007—06 New Harmonic Detection Method Based on the LMS Algorithm of Adaptive Gain LIU Jian—hua，ZHOU Wan—peng，QIAN Hong—wen，ZHAO Shi-jie (School of Information and Electrical Engineering，China University of Mining and Technology，Xuzhou 221 1 16，Jiangsu，China) Abstract：The active power filter(APF)must get the harmonic current first．The compensation performance of the APF can be improved by fast and accurate harmonic detection．Based on the LMS algorithm，this paper improved the harmonic detection algorithm．The algorithm developed from reducing the cost function，and then deduced the new step iterative formula based on adaptive gain．Considering the rapidity and accuracy of detection algorithm，it was found by the Matlab simulation and DSP experiment that the error of the new algorithm’S fundamental detection result could reach 0．2 percent，and the response time was 0．0 1 S．Not only high detection accuracy was achieved，but stability could be obtained in half a fundamental harmonic cycle．The study verified the accuracy and rapidity of the new detec- tion algorithm． Key words：LMS algorithm，harmonic detection，cost function，adaptive gain 0 引 言 在不可避免的会