风电大规模并网对系统暂态稳定性的影响

Influence of Large Scale Wind Power Integration on Transient Stability

随着风电的不断发展,风电在电网的比例不断增加,风电大规模并网对电力系统暂态稳定性的影响日益突出。本次仿真研究以内蒙古某地区实际含风电厂的电网为例,使用FASTEST软件搭建出风电并网的模型,并对含风电场的电力系统进行潮流计算。在潮流计算结果收敛的基础上,主要研究风电接入的电网在三相短路故障下系统的暂态稳定性。主要包括不同风电出力的情况下系统的故障极限切除时间,故障下系统的电压稳定性,以及考虑低电压保护的系统故障对风电机组机端电压、输出的有功功率和无功功率的影响。为了提高系统稳定性,使用静止无功补偿装置(SVC)为系统提供有效的无功支持,通过仿真验证了SVC可以提高风电并网电力系统的暂态稳定性。

With the development of wind power, the pro- portion of wind power in power grid is increasing, the influence of large scale wind power integration on power system transient stability is prominent. The simulation is based on a region power grid containing wind power plant in Inner Mongolia, uses the FASTEST software to build wind power grid model, then calcu- lates load flow of the power system. The load flow calculation is convergent, then study the transient stability of the wind power grid under the three-phase short circuit fault. It mainly includes the different wind power output under the condition of system fault clearance time limit, the fault voltage stability of the sys- tem, breakdown voltage and reactive power under the condition of the low voltage protection system. In order to improve the system stability, the simulation uses static reactive compensation device for the system to provide effective reactive power sup- port, and gets the expected effect.