| 考虑撬棒保护和残压的DFIG短路电流实用计算方法及应用 |
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| 引用本文： | 王耀函,刘辉,刘吉臻,吴林林.考虑撬棒保护和残压的DFIG短路电流实用计算方法及应用[J].电力技术,2014(4):134-138. |
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| 作者姓名： | 王耀函 刘辉 刘吉臻 吴林林 |
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| 作者单位： | [1]华北电力大学控制与计算机工程学院,北京102206 [2]华北电力科学研究院有限责任公司,北京100045 |
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| 摘 要： | 电网短路故障可能导致双馈风电机组过电流保护动作,定量分析故障对机组短路电流的影响对于机组的低电压穿越具有重要意义.根据电网发生对称短路故障时双馈风电机组的暂态定、转子磁链关系,研究考虑机端残压下的双馈风电机组定子短路电流特性.在短路电流特征分析中考虑转子侧撬棒（crowbar）保护的投入策略,推导出双馈风电机组发生对称故障时的短路电流实用计算方法,讨论机组参数对短路电流特征的影响.将计算结果与现场低电压穿越试验测试数据进行比对,验证计算方法的实用性.
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| 关 键 词： | 双馈风电机组 低电压穿越 撬棒保护 暂态电流分析 |
Transient Current Analysis Method of DFIG Voltage Dip Based on Crowbar Protection |
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| Authors: | WANG Yao-han LIU Hui LIU Ji-zhen WU Lin-lin |
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| Affiliation: | 1. School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, China; 2. North China Electric Power Research Institute Co. Ltd., Beijing 100045, China) |
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| Abstract: | A doubly fed induction generator （DFIG） may be switched off by its over current protection when a short circuit fault happens in the grid connected with it. Therefor, it is very important to analyze the influence of the short current on the low voltage ride-through （LVRT） of the DFIG quantitatively. The three phase symmetrical short-current linkage characteristics of DFIG have been analyzed. The transient current calculation method with voltage dip range has been given. Then the function of crowbar circuit for LVRT of a DFIG is taken into consideration, and a practical calculation method of transient current of the DFIG for three phase voltage dipping has been given. The comparation between calculation results and the test data taken from wind field prove the feasibility of transient response calculation method. |
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| Keywords: | doubly fed induction generator （DFIG） low voltage ride-through （LVRT） crowbar protection transient current analysis |
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