Variable Step-size MLMS Harmonic Detecting Method Applied to Active Power Filter
In order to improve the quality of electric energy, active power filter is used to restrain and compensate harmonic current, whose effect is determined by detecting precision and its dynamic response. Considering low Signal-to-Noise ratio of the load current, a novel variable step-size MLMS algorithm for harmonic detection is introduced in this paper, which adds a momentum factor to weights recursion formula, and uses the time-average estimation of both present error and past-step error to control the updating the step-size. Through MATLAB simulations and DSP experiments, the performances of the fixed step-size LMS algorithm and the variable step-size MLMS algorithm are analyzed, and both results verify that the latter can provide a fast dynamic response while ensuring high detecting precision. At last, the novel MLMS harmonic detecting method is applied to unbalanced three-phase circuit, whose simulation result verifies its effectiveness.
active power filters harmonic detection MLMS variable setp-size unbalanced three-phase circuit
LIU Guo-hai ZHANG Yi
School of Electricity and Information Engineering, Jiangsu University, Zhenjiang, 212013
国际会议
2008 International Conference on IAEA(2008农业信息化、自动化与电气化国际会议)
镇江
英文
400-405
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）