电力谐波检测改进算法在DSP上的应用与实现  

Application and realization on DSP of the improved power harmonic detection algorithm

作　　者：高红霞[1] 刘晓乐[1] 

机构地区：[1]河南工程学院计算机学院,河南郑州451191

出　　处：《电子技术应用》2015年第4期125-128,共4页Application of Electronic Technique

摘　　要：针对在传统电力谐波检测手段中存在的精度低和速度慢的问题,提出了一种基于提升小波变换和变步长LMS(Least Mean Square)相结合的自适应谐波检测算法。通过对谐波电流进行正交变换,有效减少了输入数据的互相关,并加快了LMS的收敛速度。采用变步长的收敛因子不仅加快了算法的收敛速度,还实现了较小的稳态误差。同时,采用DSP处理器TMS320F2812设计了电力谐波检测电路系统。实验结果表明,设计的电力谐波检测电路能够准确、实时地检测出电网上的谐波参数,提出的改进算法能在1/4个周期内跟上负载电流的变化,并且稳态误差小于0.5%,比传统的LMS自适应算法具有更高的检测精度和更快的瞬时响应速度,适合于对有源电力滤波器实时性要求较高的场合。Adaptive harmonic detection algorithm based on lifting wavelet transform and variable step LMS is proposed for the low accuracy and slow speed detection of the traditional adaptive harmonic detection method. The input data correlation is effectively reduced and the LMS convergence speed is accelerated up by the harmonic current orthogonal transformation. The variable step size convergence factor is used to increase the convergence speed of the algorithm and achieve the smaller steady-state error. Mean-while, the power harmonic detection circuit system is designed using the DSP processor TMS320F2812.The experiments results show that the designed power harmonic detection circuit system can accurately detect real-time harmonic parameter of electric net, and the proposed improved algorithm can keep up with the change of the load current in the 1/4 period, the steady-state error is less than 0.5%, and has higher detection accuracy and faster transient response speed than the traditional LMS adaptive algorithm, which is suitable for the strong real-time required occasion for active power filter.

关 键 词：有源电力滤波器 电力谐波检测 提升小波变换 变步长最小均方 

分 类 号：TP274.5[自动化与计算机技术—检测技术与自动化装置]