第29 卷第10 期电网技术Vol. 29 No. 10
2005 年5月Power System Technology May 2005
文章编号:1000-3673(2005)10-0014-06 中图分类号:TM711;TM86 文献标识码:A 学科代码:470·4054
电力系统故障恢复初期的谐波过电压问题
程改红,徐政(浙江大学 电机系,浙江省 杭州市 310027)
ANALYSIS AND CONTROL OF HARMONIC OVERVOLTAGES DURING EARLY
STAGES OF POWER SYSTEM RESTORATION
CHENG Gai-hong,XU Zheng
(Department of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)
ABSTRACT:Power system topological structure at early
stage of its restoration is quite different from that under normal
operation. When a parallel resonance condition is composed by
system impedance and capacitive parameter of transmission
line, the harmonic distortion caused by put the transformer
under no-load or light load into operation will be amplified,
thereby a rather high harmonic overvoltage will appear. The
authors research the control of transformer's magnetizing
inrush current and the improvement of frequency response
characteristics of power system, the most effective control
operation is determined by sensitivity analysis, using wavelet
analysis the magnetizing inrush current of transformer is
analyzed in both time and frequency domain and the features of
magnetizing inrush current in different frequency interval are
extracted. To save the time for simulation, based on the concept
of signal energy the varying trend of voltage waveform is
assessed to determine the end time of electro-magnetic
simulation and the fast evaluation and effective control of
harmonic overvoltage are implemented. The calculation results
for typical cranking power system show that the proposed
method is effective.
KEY WORDS : Power system ; Failure restoration ;
Harmonic overvoltage ; Magnetizing inrush current ;
Parallel resonance;Sensitivity analysis
摘要:电力系统故障恢复初期的网络结构与正常情况的有很

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