采用网侧TCVR的双馈风机低电压穿越控制策略研究

随着风电并网容量的快速增加以及海上风电的发展,风电机组在故障期间的并网运行特性更加受到关注。采用了一种比较简单的双馈型风力发电机组的低电压过渡方案。在风电场变电站的低压侧安装晶闸管控制电压调节器(TCVR),当电网电压跌落时,根据电网电压下降的幅度对网侧电压进行合理补偿,提高双馈电机定子侧电压。在PSCAD/EMTDC中建立了5 MW双馈风电系统的模型,应用所提的控制方法,对风电机组在严重对称故障下的运行特性进行仿真,验证了所提方法的有效性。

Low voltage ride-through control strategy of a DFIG with grid-side thyristor controlled voltage regulator

With the rapidly increasing capacity of grid-connected wind power and the development of offshore wind power,the operating characteristics of wind turbine during the fault have drawn more concern.This paper adopts a relatively simple method to achieve low voltage ride-through(LVRT) of doubly-fed induction generator(DFIG) based wind turbine.A thyristor controlled voltage regulator(TCVR) is installed in the low-voltage side of the wind farm substation.When voltage dip occurs,the grid-side voltage is reasonably compensated according to the degree it drops to improve the stator voltage of DFIG.A 5MW DFIG wind power system model with the proposed control strategy is established in PSCAD/EMTDC to simulate the operating characteristics of the wind turbine under severe symmetrical fault to verify the validity of the proposed method.