摘要
Abstract
The doubly-fed induction generator (DFIG) can't provide reactive power instead of absorbing it from the system for excitation which can bring about further deterioration. Aiming at the disadvantages of Crowbar protection presents a low voltage ride through the method, using DC-Chopper instead of Crowbar, at the same time, in case of failure by the decoupling control of rotor side converter, grid side control of stator to provide reactive power support, can better realize the unit fault crossing. Doubly fed inductiongenerator wind farm simulation model built in this strategy based on the PSCAD platform, verify the wind farm has the superiority of low voltage ride through capability and control strategy. On this basis, respectively, simulation analysis of fault characteristics of DFIG wind farm under different fault types. The results show that the traditional rotor Crowbar circuit input is fault current frequency for reasons of non power frequency, and the use of other non fault current frequency rotor Crowbar circuit for frequency; wind farm tie line of any type of asymmetric grounding fault, the wind farm side will show a weak source feature, single phase grounding fault performance a weak source feature is more obvious. The fault phase selection components will be seriously affected. Research findings has a certain practical value and significance of the research.关键词
双馈风电机组/控制策略/低电压穿越策略/故障特性Key words
doubly fed wind power generator/control strategy/low voltage ride through strategy/the fault characteristic分类
信息技术与安全科学
