双馈风力发电机低电压穿越控制策略研究

LVRT Control Strategy of the DFIG

以双馈感应发电机(DFIG)为主的风力发电机组在电力系统中所占的比例逐渐增大,实际应用中,必须将风力发电机与电网作为一个整体来控制,因此,需要研究在电网电压瞬间跌落时,双馈风电机组的低电压穿越(LVRT)运行能力。在此应用PSCAD/EMTDC对2 MW DFIG接入电网进行系统建模,研究对称故障时电网电压跌落对DFIG运行的影响,在转子、定子侧应用LVRT控制策略,分析了动态仿真结果,验证了控制策略的可行性。

The double-fed induction generator（DFIG） has paid a large portion of the wind turbine generator system,so the wind generator must be controlled with the power grid as a whole.It＇s necessary to study the low voltage ride through（LVRT） ability of the DFIG during the voltage sag.Taking the parameters of wind farm with 2 MW DFIG in-tegrated into the grid for example,the simulation model is developed using PSCAD/EMTDC.This thesis analyses the impacts of the symmetric fault and voltage sags on DFIG,and a LVRT control strategy is used on rotor side and sta-tor side.The simulation results prove the feasibility of this control strategy.