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| Potential Harmonic Amplification and Its Prevention of Industrial Rectifier System Based on Inductive Filtering Method |
| Liu Wenye, Luo Longfu, Li Yong, Zhang Zhiwen, Huang Zhao |
| Hunan University Changsha 410082 China |
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Abstract The twelve-pulse inductive filtering technology can effectively solve power quality problems such as harmonic pollution, poor power factor, etc., in energy-intensive enterprises. However, due to the variation of grid impedance and the mismatching parameters between new converter transformer and its inductive filtering devices, low-order harmonic currents in the supply current might be amplified in a practical engineering application, which endangers the filter performance and the safe operation of inductive filtering system. In this paper, the mechanism of harmonic amplification is analyzed and the mathematical model of system harmonic is established. Then, two solution schemes, that are adopting hybrid active filter and optimized pure passive filters, are presented. The later scheme has been applied in an electrolytic aluminum enterprise, which is effective to solve the phenomena of the harmonic enlargement of low order harmonic currents. The simulation and the engineering test results validate the correctness of theoretical analysis.
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Received: 26 February 2013
Published: 18 June 2014
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2014, Vol. 29 
