电力系统及其自动化学报2019，Vol.31Issue(4)：106-112,117,8.DOI:10.3969/j.issn.1003-8930.2019.04.015
电网电压不对称暂降下考虑Chopper动作的双馈风机转子电流分析
Analysis of DFIG Rotor Current Considering Chopper Protection under Asymmetrical Grid Voltage Sags
林瑞星 1马晓阳 2常晓青 1徐琳 1丁理杰 1杨洪耕3
作者信息
- 1. 国网四川省电力公司电力科学研究院,成都 610072
- 2. 四川大学电气信息学院,成都 610065
- 3. 四川大学电气信息学院,成都 610065
- 折叠
摘要
Abstract
Considering the DC Chopper circuit of doubly-fed induction generator(DFIG)triggered by unbalanced grid voltage sags,the DFIG rotor’s asymmetrical three-phase current after the switching of Chopper circuit is analyzed. The DFIG will present complex electromagnetic transient characteristics under asymmetrical fault of generator-side voltage. First,positive-and negative-sequence models of DFIG are established in forward and reverse rotating reference frames. Then,based on the sequence component superposition method,the transient component generated in the complex elec?tromagnetic transient process is decomposed into positive-sequence,negative-sequence and free components under asymmetrical fault. Moreover,the accurate analytical expressions of the rotor’s transient short-circuit current under asymmetrical fault and after Chopper protection are deduced. Through simulations using Matlab/Simulink,the asymmet?rical short-circuit current characteristics of DFIG rotor under asymmetrical voltage sags are verified.关键词
双馈感应发电机/Chopper保护/不对称故障/转子电流Key words
doubly-fed induction generato(r DFIG)/Chopper protection/unsymmetrical fault/rotor current分类
信息技术与安全科学引用本文复制引用
林瑞星,马晓阳,常晓青,徐琳,丁理杰,杨洪耕..电网电压不对称暂降下考虑Chopper动作的双馈风机转子电流分析[J].电力系统及其自动化学报,2019,31(4):106-112,117,8.
