双馈风电机组在电网对称故障下低压穿越仿真

以双馈式风力发电机（DFIG）为主体的大型风力发电机组在电网中所占的比例快速提高，为了确保风电接入电力系统运行的可靠性、安全性与稳定性，电力系统对并网风力发电机在电网故障，特别是电网电压骤降故障下的低压运行能力提出了更高的要求。文中介绍了电网对称故障时DFIG的暂态特性，通过对转子电流与定子磁链的关系分析得出优化转子侧变换器控制策略的方案，通过配合改进网侧变流器控制方法为DFIG在电网电压跌落期间提供了一个稳定的直流母线电压，从而使电网对称故障时的定转子过电流和直流母线侧过电压的情况得到解决。在研究模型的基础上，通过改变转子侧和网侧变换器控制策略的Matlab模型进行仿真实验，结果表明该方案对于对称电压跌落故障时的LVRT有一定的可行性。

Simulation of Low Voltage Ride-Through Control of Doubly Fed Induction Generator During Grid Symmetrical Fault

The proportion of large wind turbines with doubly-fed wind generator （DFIG） in the grid has increased rapidly, in order to ensure the reliability of the Wind Power power system operation, security and stability. Power system for grid- connected wind turbines in the power grid failures, in particular, put forward higher requirements for low-voltage operation capability under the grid voltage dip fault. This paper introduces a Symmetrical Grid DFIG transient behavior of the rotor current and stator flux relationship obtained to optimize the rotor-side converter control strategy of the program, provide a stable DC bus voltage with the change into the network side converter control method for DFIG in grid voltage drop during, so that the grid symmetrical fault given rotor over-current and DC bus side over voltage situation be resolved; on the basis of careful study of the model through changes in the rotor side and grid side converter control strategy Matlab model simulation and experimental results show that the program for the symmetry the voltage drop fault the LVRT have a certain degree of feasibility.