考虑撬棒保护动作时间的双馈式风电机组短路电流特性

发布时间：2018-01-19 15:13

本文关键词： 双馈感应发电机不对称故障撬棒保护短路电流特性　出处：《电力系统自动化》2014年05期 　论文类型：期刊论文

【摘要】：撬棒(Crowbar)保护是否动作及动作时间会对双馈感应发电机(DFIG)短路电流特性产生影响。目前计及撬棒保护影响的相关研究均按照故障后撬棒保护瞬时动作来分析短路电流特性,但实际上机端电压跌落时,撬棒保护并非瞬时投入运行,而是根据故障严重程度带有不同的动作延时,这给短路电流的精确分析计算增加了难度。文中针对这实际问题,以机端发生不对称故障为例,将故障电流分解为正向和反向同步旋转坐标系下的正序和负序分量,并根据撬棒保护动作时刻将故障过程分解为两个阶段,通过数学解析的方法给出整个故障过程的短路电流计算表达式。通过与MATLAB/Simulink的DFIG标准模型对比,仿真验证了计算表达式的有效性,并分析了撬棒保护不同动作时间对DFIG短路电流特性的影响。
[Abstract]:Whether the action and the time of action will be applied to the DFIGG of the doubly-fed induction generator). The current characteristics of short circuit are analyzed according to the instantaneous action of crowbar protection after fault. But in fact, when the terminal voltage drops, the crowbar protection is not instantaneous operation, but according to the severity of the fault with different action delay. This makes it more difficult to analyze and calculate the short circuit current accurately. In view of this practical problem, this paper takes the asymmetric fault at the end of the machine as an example. The fault current is decomposed into positive sequence and negative sequence component in forward and reverse synchronous rotating coordinate system, and the fault process is decomposed into two stages according to the action time of crowbar protection. The calculation expression of short circuit current in the whole fault process is given by means of mathematical analysis, and compared with MATLAB/Simulink 's DFIG standard model. The validity of the expression is verified by simulation, and the influence of different operation time of crowbar protection on the short-circuit current characteristics of DFIG is analyzed.
【作者单位】：新能源电力系统国家重点实验室华北电力大学;中国电力科学研究院;
【基金】：国家高技术研究发展计划(863计划)资助项目(2012AA050208) 国家电网公司专项支持项目(国家电网科研〔2012〕515号)~~
【分类号】：TM315
【正文快照】： 0引基于双馈感应发电机(DFIG)的双馈式风电机组具有利用率高、逆变器容量小、功率可解耦控制[1]等优点。因此,被广泛应用于当前风力发电系统中。但是,双馈式风电机组的电磁暂态特性十分复杂,当电网故障导致机端电压跌落较严重时,定转子侧都会产生过电流。为了保护机组和变流

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