双馈感应风电机组在电网频率变化时的响应特性分析

针对风电机组双馈感应发电机在电网频率变化时给电网频率调节带来的问题,阐述了DFIG风电机组单机联网运行仿真模型和系统参数,通过仿真算例分析了双馈感应风力发电机组在电网频率突变时的频率响应特性。仿真结果表明,电网频率突变后,双馈感应风电机组的动态调节过程持续时间快于火电机组3倍;在桨距角不变、动态过程中,双馈感应风电机组能够对电网频率突变进行响应,而稳态时不能对电网频率变化进行响应。

Analysis of response characteristics of doubly -fed induction generator as the network frequency changes

Aiming at the problems of network frequency adjustment brought by the doubly - fed induction wind pow- er generator unit as the network frequency changes, this paper expounds the simulation model and system parameters of DFIG single - machine operation interconnected with power network, and analyzes the characteristics of frequency response of DFIG as the network frequency changes. Simulation result shows that after the change of network fre- quency, the lasting period of dynamic adjustment is three times faster than that of thermal power unit ; during the dy- namic process with constant propeller pitch angle, DFIG is able to respond to the sudden change of network frequen- cy, while it fails to respond to the change at the stationary state.