基于改进型LMS自适应算法的谐波检测方法  

Harmonic Detection Based on Improved LMS Adaptive Algorithm

作　　者：段玉波[1] 姜骁楠[1] 付光杰[1] 

机构地区：[1]东北石油大学电气信息工程学院,黑龙江大庆163318

出　　处：《化工自动化及仪表》2014年第3期246-250,共5页Control and Instruments in Chemical Industry

摘　　要：采用自适应滤波器代替原来检测电路中的低通滤波器,解决了基于瞬时无功功率理论的谐波检测精度与动态响应之间存在矛盾的问题。采用变步长LMS算法,在步长更新公式中引入变量,并用误差的时间均值估计来控制步长的更新,加快了算法的收敛速度。理论分析与实验仿真证明,该方法具有较快的动态性能和较高的检测精度。Replacing LPF with adaptive filter in detection circuit can smooth confliction between instantaneous reactive power-based harmonic detection precision and dynamic response.In variable step-size least mean square algorithm,the variable introduced into the step-size update formula and the error＇ s mean time which controlling the updating of the step size can speed up the algorithm＇ s convergence rate.Both theoretical analy sis and simulation result proves better dynamic performance and high detection precision of this method.

关 键 词：谐波检测 瞬时无功功率理论 自适应滤波器 变步长LMS算法 

分 类 号：TH873.7[机械工程—仪器科学与技术]