一种基于LMS自适应原理的FBD谐波检测方法的研究＊

通过分析传统FBD谐波检测方法,针对在获取基准参考电压和基波电流时的不足做出了改进.首先设计了一种利用电压序列分解替代锁相环的基准电压检测方法,得到与基波正序电压同频同相的参考电压;同时使用LMS自适应滤波法替代低通滤波器,并添加了闭环回路,把检测到的谐波电流反馈到输入电流中,改进后的滤波方法能够显著提高滤波环节的跟踪速度和动态性能.最后通过仿真验证了改进的FBD谐波检测方法的正确性和优越性.

Research on a FBD harmonic detection method based on LMS self-adaptive principle

By analyzing the traditional FBD harmonic detection method,improvements have been made in the shortcomings of obtaining reference voltage references and fundamental currents.At first,a reference voltage detection method using voltage series to decompose and replace phase-locked loop is designed to obtain a reference voltage with the same frequency and same phase as the fundamental positive sequence voltage;At the same time,replacing low-pass filter with LMS self-adaptive filter and adding a closed loop so that the detected harmonic current feedback to the input current.The improved filtering method can significantly improve the tracking speed and dynamic performance.Finally, the correctness and superiority of the improved FBD harmonic detection method are verified through simulation experiment.