An Improved Adaptive Harmonic Detection Algorithm for Active Power Filter
Zhang Jianzhong1, Geng Zhi1, Xu Shuai1, Chen Hao2
1. School of Electrical Engineering Southeast University Nanjing 210096 China; 2. Jiangsu Electric Power Maintenance Branch Company Nanjing 210000 China
Abstract:Harmonic detection is the key of active power filter (APF), which is the basis of ensuring the accurate compensation for harmonics by APF. Harmonic detection algorithm based on adaptive filtering can dynamically adjust step factor and is widely used in APF. The performance of adaptive filtering is determined by adaptive algorithm that needs to balance steady-state accuracy and dynamic performance. In this paper, the load circuit characteristics of APF main circuit are analyzed. Combined with the least mean square (LMS), an improved adaptive harmonic detection algorithm is proposed based on the load current characteristics to ensure that APF has better steady-state accuracy in steady state and has a faster response speed when mutation happens. Finally, the experimental platform is built to verify the proposed harmonic detection algorithm. The experimental results verify the effectiveness of the proposed algorithm.
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