风电集中并网运行对系统电压稳定性的影响研究

摘要

Uncertainty of wind power resources and operating characteristics of the wind turbine itself makes wind turbine output power of change, which is equivalent to big power system disturbances. With the gradual increase of wind power penetration, it＇s high time to study the Voltage stability of large grid-connected wind power operation problem, it detail analyses the effect of voltage stability about wind farm under different wind speed model, installed capacity of wind power and fault clearing time. The static synchronous compensator applied to wind farms, according to the simulation results, the voltage restore rapidly after the faults cleared, so the low voltage ride through（LVRT）capability of wind turbines is improved, ensures the continuous operation of wind turbines and the security of the power network%风力资源的不确定性和风电机组本身的运行特性使风电机组的输出功率随之变化，对电力系统来说相当于一个大的扰动。随着风电穿透功率的逐步增加，大规模风电并网运行的电压稳定性问题亟待研究。利用Matlab／Simulink建立风电场仿真模型，详细分析了不同风速模型、风电场装机容量及短路故障切除时间下风电场对电压稳定性的影响。把静止同步补偿器（StaticSynchronousCompensator，STATCOM）应用到风电场中，仿真结果表明，STATCOM可以改善风电场的电压稳定性，提高了风电机组的低电压穿越能力，确保风电机组连续运行及电网安全稳定。