諧振接地系統(tǒng)單相接地故障暫態(tài)仿真與分析
嚴(yán)敏1，郭謀發(fā)1，林偉2
1 福州大學(xué) 電氣工程與自動(dòng)化學(xué)院，福建 福州 350108；
2 福建水口發(fā)電集團(tuán)尤溪流域分公司，福建 三明 365100
摘 要：在諧振接地系統(tǒng)時(shí)域、頻域特征分析的基礎(chǔ)上，通過Matlab軟件建立以分布參數(shù)為基礎(chǔ)的高精度諧振接地系統(tǒng)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(tǒng)單相故障暫態(tài)接地電流中含有暫態(tài)電感電流與電容電流，其比例隨故障時(shí)刻的不同而變化；在選定頻帶內(nèi)，故障線路和非故障線路暫態(tài)零序電流極性相反；故障初相角為零附近（0～30°）經(jīng)小電阻接地故障情況下，故障線路零序電流出現(xiàn)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(wěn)態(tài)時(shí)出現(xiàn)一定的相位移。
關(guān)鍵詞：諧振接地系統(tǒng)；單相接地故障；Matlab仿真；倒相；相位移
中圖分類號(hào)：TM864 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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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