不同类型风电场对电网暂态稳定性的影响

Influence of Different Types of Wind Farms Integration on Power System Transient Stability

研究了采用笼式和双馈式感应发电机的大规模风电场接入对电力系统暂态稳定性的影响。从理论上分析了笼式和双馈式感应电机的稳定机理;基于不同风电场和相关电网的数学模型,计算了电网发生故障后以故障临界切除时间表征的系统暂态稳定性;通过仿真计算,揭示了不同类型风电场对电网稳定性的影响,验证了理论分析结果。最后得出结论:笼式机组风电场的接入由于吸收无功而削弱了系统的稳定性;双馈式机组风电场接入对系统稳定性的影响,主要取决于接入点、电网结构、运行方式、故障类型等多种因素,其稳定性必须经具体的仿真计算才能确定。

Influence of large scale wind farm using the models of squirrel cage induction generator and DFIG （ double-fed induction generator） on power system transient stability is studied in this paper. In theory, the transient stability mechanism of squirel cage in- duction generator and DFIG is analyzed. Based on different types of mathematical models of wind farms and related power grid, tranisent stability eharactered CCT （critical clearing time） is simulated when grid fault is occurred. Through simulation, influence of different types of wind farms on grid transient stability is revealed, and the theoretical analysis is verified. At last, two conclusions come out： one is squirrel cage induction generator weakens the transient stability of grid, the other is that whether transient stability weakens or strengthens by DFIG depends on digital simulation results related to access points, grid structures, operation modes, etal.