An Improved LMS Harmonic Current Detection Algorithm

Currently the most commonly used active filter is the i
_p
-i
_q
method, but the i
_p
-i
_q
method relies on a low-pass filter, which affects the response speed of the device. This paper uses load current characteristics combined with Least Mean Square (LMS) to construct an improved LMS harmonic current detection algorithm. Without low-pass filter, variable step factor and shift the phase positive feedback link improves the detection speed. The simulation results show that, compared with the traditional detection results i
_p
-i
_q
, this method has a faster response speed to the fundamental active current.