风电接入某地区配电网安全稳定分析

随着风电装机容量的不断增加,风电波动对网架结构薄弱的地区电网造成不利影响。首先建立适用于机电暂态仿真的双馈异步风电机组数学模型,然后利用Matlab/Simulink实现包含风电场、本地同步发电机、电网负荷等电力系统潮流计算和暂态仿真,分析了典型运行方式下风电接入对某薄弱地区电网的影响。计算分析表明,风速突变对电网影响较小,但在三相短路故障时,风电出力、风电并网点电压均急剧下降,严重情况可导致风电场与电网解列,不利于当地电网安全稳定运行,需要制定合理的安全稳定措施。

Analysis on Security and Stability of Integration of Wind Farms into Distribution Network

With the increasing share of the wind power in the power system, wind power fluctuations will cause obvious negative impacts on weak local grid. This paper firstly established electromechanical transient simulation model for doubly fed induction wind turbine, then used Matlab/Simulink to achieve power flow calculation and transient simulation of power system including wind farms, the local synchronous generator, load, etc. Finally, it analyzed wind power on the impact of the local power grid under typical circumstances. The actual calculated results indicate that wind mutation causes little effect on the power grid, but when the three-phase short circuit fault happens, active power of wind power decreases sharply and the voltage of location of wind power into the grid also drop sharply, finally wind farm split from power system. This situation is not conducive to security and stability of the local power grid. It is necessary to develop security and stability measures in the future.