PDF(2329 KB)
Harmonic Current Detection Based on Improved LMS Algorithm
LI Qiankun,LIU Yili,LIU Shengxing
Distributed Energy ›› 2022, Vol. 7 ›› Issue (5) : 9-16.
PDF(2329 KB)
PDF(2329 KB)
Harmonic Current Detection Based on Improved LMS Algorithm
In order to improve the detection effect of harmonic current and enable the active filter (APF) to better eliminate harmonics, this paper firstly uses a fixed-step minimum least mean square (LMS) algorithm on the basis of APF and embeds a low-pass filter. Then use the sparrow search algorithm (SSA) to improve the filtering parameters, and then change the load parameter value to verify that the improved LMS algorithm is also applicable under different load values, and finally by using Matlab a simulation model was built, and the three different methods of fixed-step LMS algorithm, SSA algorithm, and particle swarm algorithm (PSO) were compared in the model to improve the simulation effect of filtering parameters. The simulation results show that the SSA algorithm is used to optimize the parameters. It can make the current flowing through the power grid reach the level of only the fundamental current, and reduce the total harmonic distortion (THD) of the current to less than 5%, which meets the IEEE standard, reduces the harmonic content of the current, and makes the system more stable. The applicability and feasibility of the method are also shown.
harmonic detection / least mean square (LMS) algorithm / sparrow search algorithm (SSA) / fundamental current
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