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Accurate detection for harmonics and reactive currents in the case of unsymmetrical three phase voltages

Ma Daming, Zhu Dongqi, Gao Jingde Department of Electrical Engineering, Tsinghua University, Beijing 100084  
The proper compensation method for nonlinear loads in the case of unsymmetrical threephase voltages is discussed. Limitations of the detecting method based on the theory of instantaneous reactive power for harmonics and reactive currents are analyzed, then a novel detecting method is presented. Due to the use of double close loop control in this method, the fundamental reactive current and high frequency harmonics also can be detected accurately when three phase voltages are unsymmetrical. The changes of circuit parameters only have small influence on the accuracy of the detecting system. According to the power equation, the compensating current is modified. Simulations are carried out to verify the feasibility and correctness of this method.
【Fund】: 国家科委攀登计划(B)项目
【CateGory Index】: TM933.37
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