摘要
为了提高电能质量,通常进行电网谐波补偿和抑制,补偿的效果取决于谐波检测的精度和动态响应特性,谐波检测性能的满足来源于算法。对已有自适应算法性能进行分析,提出了一种新的变步长LMS算法,递推公式中的三个系数可根据具体情况进行调整,以达到最佳的滤波效果。该方法在低信噪比的条件下有很好的跟踪性能,同时也具有较快的动态响应速度和较小的稳态失调。仿真分析证明了该算法应用于谐波检测的有效性。
Restraining and compensating the harmonics of power grid is a normal way to improve the quality of electric energy, the effects of compensation is determined by precision of detection and its dynamic response characteristics, and the satisfaction of performance of harmonics detection comes from the algorithm. A new LMS algorithm with variable steplength is introduced through studying a number of conventional selfadaptive algorithms. Three parameters in recurrence formula can be adjusted to best fit the practical situation so that optimal filtering effect can be achieved. This new method keeps excellent tracking ability at low noise/signal ratios. It also features rapid dynamic response time and smaller stable-state maladjustment. The simulation result further proves the effectiveness of the algorithm in application of harmonics detection.
出处
《自动化仪表》
CAS
2007年第8期67-69,共3页
Process Automation Instrumentation
关键词
谐波
检测
变步长
自适应
滤波
Harmonics Detection Variable steplength Self-adaptive Filter
