双馈感应发电机接入电网的三相短路电流峰值评估

发布时间：2018-01-12 13:17

本文关键词：双馈感应发电机接入电网的三相短路电流峰值评估　出处：《电力系统自动化》2014年18期 　论文类型：期刊论文

【摘要】：短路电流计算是电网规划和保护的基础,文中将双馈感应发电机(DFIG)定子磁链强制分量归算至定子侧,将定子磁链直流分量归算至转子侧,形成静态等值电路,分析转子感应磁链随转速的变化规律,研究转子电阻对故障时定子磁链直流分量动态衰减及其与转子绕组感应过程的影响,推导电网三相短路时DFIG定子短路电流解析式。比较了近端和远端故障时不同撬棒电阻对应定子短路电流特性,提出了DFIG接入电网的三相短路电流峰值评估方法。该方法能有效计算DFIG机端、馈线上下游和其他馈线故障时的三相短路电流峰值序列,采用MATLAB/Simulink软件仿真验证了所提出方法的正确性。
[Abstract]:Short circuit current calculation is the basis of power grid planning and protection, the doubly fed induction generator (DFIG) stator flux forced component reduction to the stator, the stator flux of DC component reduction to the rotor side, forming a static equivalent circuit analysis of rotor flux variations with the rotational speed of the rotor resistance of stator fault the flux of DC component of dynamic attenuation and its influence and the rotor winding of the induction process, derived when three-phase short-circuit fault DFIG stator short-circuit current formula. Comparison of the proximal and distal faults of different corresponding stator crowbar resistance short-circuit current characteristics, method of three-phase short-circuit current peak grid DFIG evaluation is proposed. This method can effectively calculate the DFIG machine at the end of the peak, three-phase short-circuit current series feeder and other downstream feeder fault, verify the correctness of the proposed method by MATLAB/Simulink simulation software.

【作者单位】：输配电装备及系统安全与新技术国家重点实验室重庆大学;广东电网公司珠海供电局;
【基金】：国家自然科学基金资助项目(51277184) 国家高技术研究发展计划(863计划)资助项目(2011AA05A107)~~
【分类号】：TM31
【正文快照】： 0引言双馈感应发电机(doubly-fed inductiongenerator,DFIG)以其灵活的控制性能,在风力发电系统中应用广泛。电网短路时DFIG机端电压下降,在定子绕组产生冲击电流,对于大部分商用DFIG机组,须在转子侧接入合适的撬棒电阻,以保护DFIG和实现低电压穿越运行[1-2]。短路电流计算是

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