基于直流母线电阻的双馈风力发电机的低穿仿真分析

Simulation Analysis on the Low Voltage Ride Through Technologies of DFIG with Direct Bus Resistance

随着风电并网规模的扩大,大规模风电接入对地区电网稳定性的影响不容忽视。由于双馈风力发电机组对低电压穿越(LVRT)能力要求更高,风力发电机组尤其是双馈风力发电机组的低电压穿越技术改造已成为风电行业的重要工作。文章介绍了双馈风力发电机组在LVRT改造中应用的直流母线电阻和撬棒(Crowbar)保护技术,并对其进行了仿真建模分析,经仿真比较,证明了直流母线电阻保护的有效性。在电压跌落不是很严重的情况下,仅投入直流母线电阻即可实现低电压穿越。

With the expansion of the grid connection of wind power,the effect of wind power on the stability of grid can not be ignored. Because the requirements of DFIG on LVRT ability are higher, the transformation to LVRT of DIFG became important in wind industry. This paper introduces a technology of direct bus resistance and crowbar in transformation,and analyses its modeling and simulation. The simulation result shows that direct bus resistance pro- tection is effective. Applying direct bus resistance can be realized LVRT when the voltage drop is not serious.