一種變壓器高頻模型在電網(wǎng)過電壓中的應(yīng)用與仿真
史建省,于群,于夢瑤,彭東虎,楊亞奇
山東科技大學(xué) 信息與電氣工程學(xué)院,山東 青島 266590
摘 要:變壓器中性點過電壓包含的高頻分量使變壓器工頻模型的仿真結(jié)果無法準(zhǔn)確反映變壓器暫態(tài)過電壓的實際情況。研究了變壓器內(nèi)部結(jié)構(gòu)及原理,應(yīng)用PSCAD軟件,以某電網(wǎng)110kV系統(tǒng)為背景,使用變壓器工頻模型與變壓器高頻模型對該變電站非接地主變中性點不對稱故障過電壓進行了仿真比較,通過與理論計算數(shù)值的對比得出,該高頻模型能夠準(zhǔn)確有效地仿真各種不對稱故障過電壓。
關(guān)鍵詞:過電壓;高頻分量;暫態(tài)峰值;變壓器高頻模型
中圖分類號:TM866 文獻標(biāo)識碼:B 文章編號:1007-3175(2014)04-0036-05
Application and Simulation of a kind of High-Frequency Transformer Model in Power Grid Overvoltage
SHI Jian-sheng, YU Qun, YU Meng-yao, PENG Dong-hu, YANG Ya-qi
College of information and Electrical Engineering, Shandong University of Science & Technology, Qingdao 266590, China
Abstract: Because the overvoltage at transformer neutral point contains high-frequency component, the simulation result of the transformer power frequency model couldn’t be used to reflect the actual situation of transformer transient overvoltage. Study was made to the transformer internal structure and principle. In application of PSCAD software and with certain power grid 110kV system as background, the transformer working frequency model and transformer high-frequency model were used to carry out simulation comparison for asymmetry fault overvoltage at non-grounding main transformer neutral point in substation. The theoretical calculation value comparison shows that the high-frequency model can correctly and effectively simulate various asymmetry fault overvoltage.
Key words: overvoltage; high-frequency component; transient peak;transformer high-frequency model
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