諧振接地系統單相接地故障暫態仿真與分析
嚴敏1，郭謀發1，林偉2
1 福州大學 電氣工程與自動化學院，福建 福州 350108；
2 福建水口發電集團尤溪流域分公司，福建 三明 365100
摘 要：在諧振接地系統時域、頻域特征分析的基礎上，通過Matlab軟件建立以分布參數為基礎的高精度諧振接地系統單相接地故障仿真模型，分析了幾種極端故障情況下的線路零序電流波形的特征。通過分析可得：諧振接地系統單相故障暫態接地電流中含有暫態電感電流與電容電流，其比例隨故障時刻的不同而變化；在選定頻帶內，故障線路和非故障線路暫態零序電流極性相反；故障初相角為零附近（0～30°）經小電阻接地故障情況下，故障線路零序電流出現倒相，且倒相程度隨故障初相角的變化而不同；在大電阻接地故障的情況下，故障與非故障線路零序電流在穩態時出現一定的相位移。
關鍵詞：諧振接地系統；單相接地故障；Matlab仿真；倒相；相位移
中圖分類號：TM864 文獻標識碼：A 文章編號：1007-3175(2013)02-0001-05
Single Phase Grounding Fault Transient Simulation and Analysis of Resonant Grounding System
YAN Min1, GUO Mou-fa1, LIN Wei2
1 College of Electric Engineering and Automation, Fuzhou University, Fuzhou 350108, China;
2 Youxi River Power Co.,Ltd of Fujian Shuikou Power Generation Group, Sanming 365100, China
Abstract: On the basis of resonant grounding system time domain and frequency domain features analysis, this paper established high accuracy resonant grounding system single phase grounding fault simulation model with distributed parameters as basis via Matlab software and analyzed characteristics of line zero-sequence current waves under some kinds of extreme fault conditions. Analysis showed that single phase fault transient ground current of resonant grounding system contained transient inductor current and capacitor current, whose proportion varied with fault time. Within the selected frequency band, the polarity of transient zero-sequence current in the fault line was opposite to that of non-fault line. When the early phase angle is near zero(0~30°), in the case of low resistance grounding fault, fault line zero-sequence current appeared in reversed phase, changing differently following fault early angle changes. In the case of large resistance grounding fault, fault and non-fault line zero-sequence current would have a phase shift in steady-state.
Key words: resonant grounding system; single phase grounding fault; Matlab simulation; reversed phase; phase shift
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