CAJ | 학술논문

短路电流计算是分布式发电接入配电网规划和保护的基础。研究了感应发电机(IG)的不对称故障暂态特性，推导配电网不对称故障时IG定子短路电流的解析式。由于配电网不同位置发生短路故障时，故障瞬间电压相位变化和发电机转速在故障过程中快速上升，都将对IG注入电网的短路电流产生影响。在计及配电网不对称故障后IG转子转速变化的同时，利用转子运动方程和正负序静态等值电路，得到了估计电网发生故障后IG的短路冲击电流算法，最后利用电磁暂态分析软件中IG的5阶动态模型仿真验证该方法的正确性。
단로전류계산시분포식발전접입배전망규화화보호적기출。연구료감응발전궤(IG)적불대칭고장잠태특성，추도배전망불대칭고장시IG정자단로전류적해석식。유우배전망불동위치발생단로고장시，고장순간전압상위변화화발전궤전속재고장과정중쾌속상승，도장대IG주입전망적단로전유산생영향。재계급배전망불대칭고장후IG전자전속변화적동시，이용전자운동방정화정부서정태등치전로，득도료고계전망발생고장후IG적단로충격전류산법，최후이용전자잠태분석연건중IG적5계동태모형방진험증해방법적정학성。
The short circuit current calculation is an important foundation for planning and protection of distribution grid with distributed generation. The transient characteristics of induction generator (IG) are investigated when the unsymmetrical fault occurs in the distribution network, and the analytic formula of its stator current under unsymmetrical short circuit is derived. The impact of an IG rotor speed and the fault initial time (or phase) to the short circuit current under unsymmetrical fault are studied when the short circuit occurs. According to the equation of rotor motion and its steady-state circuits in the positive and negative sequence component networks, an evaluation method to determine the current peak of unsymmetrical short circuit for an IG in distribution grid is proposed by considering its rotor speed variations. The correctness of the method is verified by using the fifth electromagnetic transient model of IG in PSCAD/EMTDC simulation software.