摘要
含Crowbar保护的双馈风力发电机在模型上不同于普通异步发电机。首先,双馈风力发电机在转子侧连接着变流器;其次对转子侧变流器采用Crowbar保护。因此,在短路电流计算方法上,两者也必然有相应的差异。目前,在双馈风力发电机短路电流计算方面,我国采用的国家标准为GB/T15544.1《三相交流系统短路电流计算》。该标准中,没有考虑广泛采用的Crowbar电阻元件对短路电流的影响。为此,在研究建立含Crowbar保护的双馈风力发电机新模型的基础上,推导双馈风力发电机短路电流实用计算公式。文中还用PSCAD/EMTDC软件的精确模型仿真结果对提出的含Crowbar电阻的双馈风力发电机三相短路电流实用计算公式进行了验证,并比较了国家标准计算方法。研究表明:推导提出的含Crowbar保护的双馈风力发电机三相短路电流实用计算公式准确、方便,对风电场的电气安全设计具有重要意义。
Model of DFIG with crowbar protection is different from common asynchronous generator in those： firstly, DFIG rotor side is connected to converter; secondly, the converter is protected with crowbar. In calculation method, two generators also have corresponding differences. In term of short-circuit current calculation, national standard GB/T 15544.1《Short-circuit current calculation in three-phase a.c. systems》is adopted now in China. This calculation method does not consider crowbar resistance impact. Therefore, a new model of DFIG with crowbar protection was established to research practical calculation method of three-phase short-circuit current of DFIG with crowbar protection. Practical calculation method of three-phase short-circuit current was verified with PSCAD/EMTDC simulation. Comparison between national standard calculation method and practical calculation method with new model was performed. It demonstrates that practical calculation method of three-phase short-circuit current of DFIG with crowbar protection proposed in this paper is accurate and convenient. It is of great significance to electrical safety design of wind farm.
出处
《电网技术》
EI
CSCD
北大核心
2016年第7期2075-2080,共6页
Power System Technology
基金
国家自然科学基金资助项目(51377047)~~
