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《Transactions of China Electrotechnical Society》 2010-08
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A Digital Method for Detecting Harmonic Currents Based on Instantaneous Reactive Power Theory

He Yingjie1 Liu Jinjun1 Wang Zhao'an1 Zou Yunping2 (1. Xi'an Jiaotong University Xi'an 710049 China 2. Huazhong University of Science and Technology Wuhan 430074 China)  
The choice of the cut-off frequency reflects a tradeoff between maladjustment and the speed of dynamic response in the conventional detection method based on instantaneous reactive power theory. The paper proposes a novel digital real-time algorithm for detecting harmonic currents. This algorithm adopts a new variable step size least mean square(LMS) adaptive filter as LPF on harmonic detection circuit. The step-size is large when the algorithm is far from the optimum with decreasing as it approaches the optimum. The proposed algorithm allows more flexible control of misadjustment and fast convergence rate without the need to compromise one for the other. Meanwhile approximate theoretical expressions for the behavior of the algorithm are derived. The additional calculation is very little,so the algorithm presented is easy to implement. Simulation and experiment results illustrate that the performance of the proposed approach is satisfactory.
【Fund】: 国家科技支撑计划(2007BAA12B03);; 中国博士后基金特别资助项目(200801429);; 国家自然科学基金(50907052)资助项目
【CateGory Index】: TM76;TM935
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