一种改进的自适应谐波检测方法及其应用  

An Improved Adaptive Harmonic Detection Method and Its Application

作　　者：马立新[1] 严亮[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《电力科学与工程》2014年第11期7-10,共4页Electric Power Science and Engineering

基　　金：国家自然科学基金(F050304);国家科技部政府间科技合作项目(2009014)

摘　　要：提出了一种改进的变步长自适应算法,将其运用于有源电力滤波器中的谐波电流检测中,取得了很好的效果。在常见的变步长自适应算法中,步长与误差或者输入信号有关,而在自适应的调节过程中,步长存在较大的波动,影响谐波电流检测的准确性。改进的自适应算法首先对误差信号加绝对值,接着对其求均值并以该均值来控制步长的变化,从而克服了步长波动的不足。该算法不但具有较快的动态响应,而且提高了谐波检测的精度。通过MATLAB仿真验证了该算法的可行性和有效性。This paper puts forward an improved variable step size adaptive algorithm,which is applied to an active power filter（ APF） harmonic current detection,and good results have been achieved. In a common variable step size adaptive algorithm,step length is associated with error or the input signal,and in the process of adaptive adjustment,step length is a larger fluctuation,which affects the accuracy of the current detection. In this paper,the improved algorithm firstly adds the absolute value of error signals and then calculates the mean and lastly controls the step changes with the mean,which can overcome the disadvantages of step length fluctuation. The algorithm does not only has faster dynamic response but also improves the precision of harmonic detection. The feasibility and effectiveness of this algorithm can be proved through MATLAB simulation.

关 键 词：谐波检测 变步长自适应算法 有源电力滤波器 自适应步长 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]