引用本文:王燕萍,郑涛,王增平,等.不同转差率对双馈风机撬棒投入后的短路电流影响分析[J].电力系统保护与控制,2015,43(17):8-14.
WANG Yanping,ZHENG Tao,WANG Zengping,et al.Impact analysis of different slips on the short circuit current of DFIG after crowbar operation[J].Power System Protection and Control,2015,43(17):8-14
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不同转差率对双馈风机撬棒投入后的短路电流影响分析
王燕萍1, 郑涛1, 王增平1, 曹雅榕1, 朱时雨1, 杨国生2
1.新能源电力系统国家重点实验室，华北电力大学，北京102206;2.中国电力科学研究院，北京100192
摘要:
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。
关键词:  撬棒电路  双馈风机  转差率  短路电流  故障特性
DOI：10.7667/j.issn.1674-3415.2015.17.002
分类号:
基金项目:
Impact analysis of different slips on the short circuit current of DFIG after crowbar operation
WANG Yanping1, ZHENG Tao1, WANG Zengping1, CAO Yarong1, ZHU Shiyu1, YANG Guosheng2
1.State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China;2.China Electric Power Research Institute, Beijing 100192, China
Abstract:
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.
Key words:  crowbar circuit  DFIG  slip  short-circuit current  fault characteristics
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