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为提高电网电压跌落故障情况下双馈风力发电系统不间断运行的能力,提出了一种基于无源性理论的双馈风力发电机低电压穿越控制策略.通过分析双馈风力发电机系统模型的无源性,设计了状态反馈控制器;根据双馈风力发电机在电网电压跌落故障时的运行特点,给出了一种计及电网电压变化的期望状态值计算方法,状态期望值跟随电网电压变化而迅速改变,通过状态反馈控制器可实现电机电流快速跟踪.仿真结果表明在电网电压跌落故障下所提出的控制策略可以有效的抑制双馈风力发电机定、转子过电流,并且降低了电磁转矩波动幅值.
In order to improve the capability of doubly-fed wind power generation system under uninterrupted operation under voltage sag fault, a control strategy of low voltage ride-through of doubly-fed wind turbine based on the theory of passiveity is proposed.By analyzing the model of doubly-fed wind power generator system According to the operational characteristics of doubly-fed wind turbines in the event of grid voltage sag, a method for calculating the expected state values of the grid voltage changes is given. The expected value of the state follows the change of the grid voltage Which can be quickly tracked by the state feedback controller.The simulation results show that the proposed control strategy can effectively restrain stator and rotor overcurrent of doubly-fed wind turbines and reduce electromagnetic turn Moment of fluctuation.