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《Electric Power Automation Equipment》 2010-11
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Application of multi-resolution HHT in fault locating for lines with shunt STATCOM compensation

LIU Qing,ZHANG Yuan,WANG Zengping(Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education,North China Electric Power University,Baoding 071003,China)  
The multi-resolution analysis is introduced to HHT(Hilbert-Huang Transform):the screened signal is treated by EMD(Empirical Mode Decomposition) according to its characteristic scale and the IMF(Intrinsic Mode Function) is then processed by Hilbert transform to get the instantaneous frequency and amplitude of each component.The mode aliasing is effectively eliminated by signal filtering in different time scales.The piecewise spline fitting is carried out for the signal to reduce the computational load.The multi-resolution HHT is used to analyze the measurements of lines with shunt STATCOM compensation in both steady and transient states and the harmonics for different fault locations.Simulative results show that,STATCOM makes the voltage harmonics sampled by protection obviously increased during fault;the amplitude of characteristic harmonic is big when STATCOM is located in the fault circuit.The characteristic harmonic can thus be used to adaptively locate the fault,which,combined with the distance protection for the lines with shunt STATCOM compensation,avoids its improper protection operations.
【Fund】: 河北省教育厅科学研究计划项目(Z2009450)~~
【CateGory Index】: TM761.12
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