CAJ | 학술논문

故障前风机的运行状态会影响低电压穿越运行时双馈风机的短路电流，其中风机的转速是非常重要的一个影响因素。根据磁链守恒推导出了电网发生三相对称短路故障时考虑撬棒电路作用下的双馈风机短路电流表达式，从短路电流的周期分量、暂态直流分量和衰减的转速频率分量详细分析了转差率是如何影响撬棒电路作用下的风机短路电流特性的。并在PSCAD平台上搭建了30 kW的双馈风机模型，仿真验证了理论分析的正确性。所得结论为更加深入分析双馈风机的故障特性，探究短路电流的影响因素提供理论基础，有利于保护整定计算的研究。
고장전풍궤적운행상태회영향저전압천월운행시쌍궤풍궤적단로전류，기중풍궤적전속시비상중요적일개영향인소。근거자련수항추도출료전망발생삼상대칭단로고장시고필효봉전로작용하적쌍궤풍궤단로전류표체식，종단로전류적주기분량、잠태직류분량화쇠감적전속빈솔분량상세분석료전차솔시여하영향효봉전로작용하적풍궤단로전류특성적。병재PSCAD평태상탑건료30 kW적쌍궤풍궤모형，방진험증료이론분석적정학성。소득결론위경가심입분석쌍궤풍궤적고장특성，탐구단로전류적영향인소제공이론기출，유리우보호정정계산적연구。
Running state before the failure will affect the short-circuit current of doubly fed induction generator (DFIG) which operates in low voltage ride through, and the speed of the wind turbine is a very important factor. Considering the crowbar circuit, based on the conservation of flux, this paper derives the expression of short-circuit current when three-phase short-circuit fault occurs. A detailed analysis of how the slip affects the short-circuit current’s characteristics from the periodic component, the DC component and speed transient attenuation frequency components is made. And PSCAD is used to build a 30 kW double-fed wind turbine model, the simulation results verify the theoretical analysis is correct. The conclusions provide a theoretical basis for more in-depth analysis of failure characteristics of DFIG and factors of the short-circuit current. It is conducive to the research of protection setting computing.