中文摘要：

目前,实际的电力系统仿真计算将风电场处理为一台风电机组。随着并入输电网的风电容量持续增加,仍按照一台风机等效对系统仿真计算造成的误差不容忽视,该误差能引起风电场内部保护装置的误动作。文章针对不同风电模型对风电场电压的影响做了详细比较,并给出了量化指标。经过试验仿真分析得出以下结论：不同风电场模型对风电场出口和并网点电压的影响不同,当恒速异步风电机构成的风电场采用一台风电机等效时,将会使风电场出口的相电压计算平均误差达到16.667%。因此,为保证仿真精度与风电场保护的正确动作,在对含风电场的电力系统进行仿真计算时,应将风电场处理为若干台风电机。

英文摘要：

At present,the simulation calculation for practical power system is usually carried out by regarding the wind farm as one wind power unit.Along with the increase of the grid connected wind power capacity,the error caused by simulation calculation on one equivalent wind turbine should not be neglected,the error may result in the misoperation of the internal protecting device in the wind farm.The paper carried out the detailed comparison on the effect of different kinds of wind farm models on wind farm voltage,and gave the quantitative index.By means of computer simulation analysis,several conclusions are drawn： different kinds of wind farm models make different effects on voltage of wind farm and point of common coupling（PCC）.When regard the constant speed induction motor based wind farm as one wind power generator,the average calculation error of the phase voltage at the terminal of the wind farm could reach a value of 16.776%.As a result,for guaranteeing the simulation accuracy and the right operation of the wind farm protection device,it should regards the wind farm as several wind power units when carrying out the simulation on power system.