理想电网条件下双馈风力发电系统低电压穿越技术的控制策略研究

随着风电在电网所占比例的不断增大,提高风机在故障条件下的不间断运行能力越来越重要。通过分析交流励磁变速恒频双馈风机的运行特点,建立双馈风力发电系统的并网数学模型;针对电网电压小幅对称跌落,在不增加硬件成本的基础上,改进传统双馈发电机矢量控制策略,加入前馈补偿项来抑制电压小幅跌落时转子中的过电流,提高双馈风力发电系统的低压穿越能力。在MATLAB/SIMULINK中验证控制策略的合理性,为以后深入研究双馈风力发电系统提供了基础。

Control Strategy of the Doubly-fed Wind Power Generator System of Low Voltage Ride Through Technology Ideal Grid Conditions

As the penetration of wind power in electric power systems continues to grow,it has became very important to improve the fault ride-through capability of grid-connected wind generator.Through the analysis variable speed constant frequency doubly fed induction generator running characteristics,the precise mathematical model of DFIG has been built;In order to protect the system,an improved vector control strategy of the DFIG without using any other hardware circuit is proposed,it will reduce the rotor over-current during non-serious voltage dips,where the feed-forward compensation term has been considered.The model of doubly fed inductor wind generator has been built based on MATLAB/SIMULINK.A DFIG applying in wind power generator is under study for low voltage ride-through（LVRT）.