永磁式直驱机组风电场对电力系统暂态稳定性的影响

Effect on Transient Stability of Power System for DPMSG Wind Farm

研究了采用直驱风机的大规模风电场接入对电力系统暂态稳定性的影响。从理论上分析了直驱风机的变流器对风机特性影响的机理;基于直驱风机风场的数学模型,计算了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,揭示了直驱风机和同步机对电网稳定性的影响,验证了理论分析结果。得出结论为直驱机组风电场的接入可能增强也可能削弱所接入系统的稳定性,主要取决于输出功率,但影响程度比同步机小。

The impact of large scale wind farm using the models of DPMSG( direct-driven wind turbine with permanent magnet synchronous generators) on power system transient stability is studied in this paper. In theory,the transient stability mechanism of DPMSG is analyzed. Based on mathematical model of wind farms,transient stability charactered CCT( critical clearing time) is simulated when grid default is occurred. Through simulation,the impact of wind farms and generators on grid transient stability is revealed,the theoretical analysis is verified. There is conclusions that whether transient stability is weaken or strengthened by DPMSG depends on its output power,the impact level of DPMSG is lower than generator.