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.
[1] 乔鸣忠, 夏益辉, 梁京辉, 等. 基于重复-PI的复合控制应用于并联有源滤波器研究[J]. 电力系统保护与控制, 2013, 41(14): 54-59. Qiao Mingzhong, Xia Yihui, Liang Jinghui, et al.Research on PI control based compound controller applying to shunt active filter[J]. Power System Protection and Control, 2013, 41(14): 54-59. [2] 方旌扬, 肖国春, 郑力夫, 等. 一种LCCL滤波器及其在半桥电力有源滤波器中的应用[J]. 电工技术学报, 2016, 31(22): 125-136. Fang Jinyang, Xiao Guochun, Zheng Lifu, et al.An LCCL filter for a half-bridge active power filter[J]. Transactions of China Electrotechnical Society, 2016, 31(22): 125-136. [3] 许胜, 费树岷, 赵剑锋, 等. 基于同步旋转坐标系的有源电力滤波器控制延时动态预测补偿策略[J]. 电工技术学报, 2016, 31(12): 161-169. Xu Sheng, Fei Shumin, Zhao Jianfeng, et al.The dynamic predictive compensation strategy for the time delay of active power filter control system based on synchronous rotating frame[J]. Transactions of China Electrotechnical Society, 2016, 31(12): 161-169. [4] 张雨潇, 戴珂, 陈新文, 等. 检测电流包含电容电流的SAPF谐波抑制和谐振阻尼新方法[J]. 电工技术学报, 2017, 32(增刊1): 58-67. Zhang Yuxiao, Dai Ke, Chen Xinwen, et al.An improved method of SAPF for harmonic com- pensation and resonance damping with detected current including power capacitor and load current[J]. Transactions of China Electrotechnical Society, 2017, 32(S1): 58-67. [5] 吕广强, 刘娱, 段海军. APF中一种改进的变步长LMS自适应谐波检测算法[J]. 电力系统保护与控制, 2016, 44(7): 96-101. Lü Guangqiang, Liu Yu, Duan Haijun.An improved variable step-size LMS adaptive harmonic detection algorithm for active power filters[J]. Power System Protection and Control, 2016, 44(7): 96-101. [6] 尹春杰, 王芳, 石磊, 等. 基于瞬时电压矢量定向的有源电力滤波器补偿电流检测[J]. 电工技术学报, 2017, 32(7): 112-118. Yin Chunjie, Wang Fang, Shi Lei, et al.A novel compensation current detection method for APF based on transient voltage space vector orientation[J]. Transactions of China Electrotechnical Society, 2017, 32(7): 112-118. [7] 王俊杰, 郑益慧, 姚钢, 等. 有源电力滤波器的动态因子LMS谐波检测方法[J]. 电力自动化设备, 2011, 31(4): 91-95. Wang Junjie, Zheng Yihui, Yao Gang, et al.Dynamic factor LMS algorithm for APF harmonic detection[J]. Electric Power Automation Equipment, 2011, 31(4): 91-95. [8] 李钷, 张怡茹. 基于输入观测器理论的电流谐波检测方法[J]. 电工技术学报, 2016, 31(7): 136-144. Li Po, Zhang Yiru.A current harmonics detection method based on input observer theory[J]. Transa- ctions of China Electrotechnical Society, 2016, 31(7): 136-144. [9] 洪丹枫, 苗俊, 苏健, 等. 一种变步长凸组合LMS自适应滤波算法改进及分析[J]. 电子学报, 2014, 42(11): 2225-2230. Hong Danfeng, Miao Jun, Su Jian, et al.An improved variable step-size convex combination of LMS adaptive filtering algorithm and its analysis[J]. Acta Electronica Sinica, 2014, 42(11): 2225-2230. [10] 刘献帅, 王大志, 宋克岭, 等. 基于变步长LMS的APF谐波电流检测方法[J]. 电气传动, 2016, 46(3): 39-43. Liu Xianshuai, Wang Dazhi, Song Keling, et al.Harmonic current detection method based on variable step size LMS algorithm used in APF[J]. Electric Drive, 2016, 46(3): 39-43. [11] Kwong R H, Johnston E W.A variable step size LMS algorithm[J]. IEEE Transactions on Signal Processing, 1992, 40(7): 1633-1642. [12] Aboulnasr T, Mayyas K.A robust variable step-size LMS-type algorithm: analysis and simulations[J]. IEEE Transactions on Signal Processing, 1997, 45(3): 631-639. [13] Wei Ying, Yan Zhibin.Variable tap-length LMS algorithm with variable tap-length adaptation step size[C]//IEEE Control and Decision Conference, Yinchuan, China, 2016: 3748-3751. [14] 付学志, 刘忠, 胡生亮, 等. 低信噪比下的变步长最小均方自适应算法及其在时延估计中的应用[J]. 中南大学学报(自然科学版), 2012, 43(3): 1010-1019. Fu Xuezhi, Liu Zhong, Hu Shengliang, et al.Variable step-size LMS adaptive algorithm and its application in time delay estimation for low SNR[J]. Journal of Central South University (Science and Technology), 2012, 43(3): 1010-1019. [15] 宋杰, 龙腾, 何友. 一种新的直达波干扰变步长NLMS对消算法[J]. 北京理工大学学报, 2015, 35(1): 105-110. Song Jie, Long Teng, He You.An adaptive cancel- lation of direct wave interference using a new variable-step-size NLMS algorithm[J]. Transactions of Beijing Institute of Technology, 2015, 35(1): 105-110. [16] 刘志骋, 杨博. 一种改进的变步长NLMS算法[J]. 现代电子技术, 2015, 38(22): 12-13. Liu Zhipin, Yang Bo.An improved variable-step NLMS algorithm[J]. Modern Electronics Technique, 2015, 38(22): 12-13. [17] 覃景繁, 欧阳景正. 一种新的变步长LMS自应用滤波算法[J]. 数据采集与处理, 1997, 12(3): 171-174. Qin Jingfan, Ouyang Jingzheng.A novel variable step size LMS adaptive filtering algorithm based on sigmoid function[J]. Journal of Data Acquisition & Processing, 1997, 12(3): 171-174. [18] 张红梅, 韩万刚. 一种新的变步长LMS自适应滤波算法研究及其应用[J]. 仪器仪表学报, 2015, 36(8): 1822-1830. Zhang Hongmei, Han Wangang.A new variable step LMS algorithm and its application[J]. Chinese Journal of Scientific Instrument, 2015, 36(8): 1822-1830. [19] Zhang Yuan, Xi Songtao.New LMS adaptive filtering algorithm with variable step size[C]// International Conference on Vision, Image and Signal Processing, Osaka, Japan, 2017: 1-4. [20] Yan Yonggang, Zhao Junwei, Wang Zhankui, et al.An novel variable step size LMS adaptive filtering algorithm based on hyperbolic tangent function[C]// IEEE International Conference on Computer Appli- cation and System Modeling, Taiyuan, China, 2010: 233-236. [21] Zhu Peibin, Xu Xiaomei, Zhang Xiaokang, et al.A new variable step-size LMS algorithm for application to underwater acoustic channel equalization[C]//IEEE International Conference on Signal Processing, Communications and Computing, Xiamen, China, 2017: 1-4. [22] Yan Zhengtong, Zhang Qunfei, Shi Wentao.Suppression of coupling interference based on variable step size LMS algorithm[C]//IEEE Inter- national Conference on Signal Processing, Com- munications and Computing, Xiamen, China, 2017: 1-5. [23] 施烨, 吴在军, 窦晓波, 等. 基于自适应原理的改进型FBD谐波电流检测算法[J]. 电网技术, 2014, 38(4): 1051-1058. Shi Ye, Wu Zaijun, Dou Xiaobo, et al.Adaptive theory based improved FBD algorithm for harmonic current detection[J]. Power System Technology, 2014, 38(4): 1051-1058. [24] Du Changhao, Sun Xue, Wang Yixia, et al.A variable step size LMS equalization algorithm in the satellite communication system[C]//IEEE Industrial Electronics and Applications, Hefei, China, 2016: 1557-1562. [25] 高鹰, 谢胜利. 一种变步长LMS自适应滤波算法及分析[J]. 电子学报, 2001, 29(8): 1094-1097. Gao Ying, Xie Shengli.A variable step size LMS adaptive filtering algorithm and its analysis[J]. Acta Electronica Sinica, 2001, 29(8): 1094-1097.
2019, Vol. 34 
