| 摘要: |
| 基于自适应噪声消除理论，考虑电网负载电流低信噪比的特性，对传统的最小均方（LMS）算法进行改进，得到一种新的变步长LMS自适应谐波检测算法。利用反馈误差信号的均值估计控制步长及权值的更新，当权值逐渐接近最佳值时，步长逐渐减小以保证较小的稳态误差，并有效降低不相关噪声信号的干扰。在权值迭代过程中加入动量，进一步提高系统的收敛速度。该算法在保持较高精度的同时，又具有较快的响应速度。仿真结果证明了该谐波电流检测算法的有效性。 |
| 关键词: 有源电力滤波器 谐波检测 自适应滤波 变步长 LMS算法 无功补偿 |
| DOI： |
| 分类号: |
| 基金项目:河南省教育厅自然科学基金资助项目（2011A470005）；河南省科技重大攻关项目（092102210234） |
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| Variable step-size adaptive harmonic current detection algorithm |
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BAO Ming, BAO Ming
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Tianjin Key Laboratory for Control Theory & Applications in Complicated Systems，Tianjin University of Technology，Tianjin 300384，China
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| Abstract: |
| As the grid load current has low signal-to-noise ratio，a variable step-size LMS harmonic current detection algorithm is presented based on the adaptive denoising technique，which uses the average estimation of feedback error signal to control the updating of step-size and weights. When the weight is gradually near the optimum，the step-size decreases gradually to ensure a smaller stability error and decrease the interference of irrelevant noises. A momentum is added during the weight iteration to speed up the convergence. The algorithm has both high precision and fast response. Simulative results verify its effectiveness. |
| Key words: active power filter harmonic current detection adaptive filtering variable step-size LMS algorithm var compensation |
