其他摘要：Wind farms consisting mainly of doubly-fed induction generators occupy more and more proportion in power supply. There do exist big differences of output short-circuit current characteristic between the doubly-fed induction generator and the synchronous generator. Research about the fault transient analysis of doubly-fed induction generators has become a hotspot; however, current research mainly focuses on the grid-connected system with single generator. This paper analyzes the short-circuit transient process of single doubly-fed induction generator in complex frequency domain and establishes the equivalent circuits of fundamental frequency, DC and rotor- speed frequency components in transient process respectively to study the changing regularity of short-circuit current of doubly-fed wind farms. Then this paper deduces the expression of short- circuit current increment of single generator in wind farm, and based on this, this paper further uses the improved weighted method to deduce the calculation formula of doubly-fed wind farm. Accuracy of the changing regularity of short-circuit current and the calculation formula is verified through simulation.
关键词：双馈型风电场 ; 短路电流 ; 复频域 ; 等效电路 ; 补偿增量 ; DFIG Based Wind Farm ; Short-Circuit Current ; Complex Frequency Domain ; Equivalent Circuit ; Compensated Increment
其他关键词：双馈型风电场 ; 短路电流 ; 复频域 ; 等效电路 ; 补偿增量 ; DFIG Based Wind Farm ; Short-Circuit Current ; Complex Frequency Domain ; Equivalent Circuit ; Compensated Increment
