双馈风力发电系统低电压穿越的建模与控制

为提高双馈感应风力发电机组并网的运行稳定性，研究电网故障下双馈风电机组的运行特性，使发电机在电网故障时仍能保持不间断的运行。本文主要研究了基于Orowbar保护控制的低电压穿越运行的控制策略，通过Orowbar保护电路来限制电压跌落时转子回路的最大电流，并通过仿真分析了电压跌落的程度和旁路电阻的取值对控制的影响。仿真结果验证了在电网电压骤降下Crowbar保护电路的有效性，可实现双馈风力发电机不间断的运行。

Modeling and Control of Low Voltage Ride Through of DFIG Wind Energy Generation System

To improve the doubly fed induction wind turbine operation stability of the grid, study operating characteristics under fault double-fed wind turbine, the generator can still maintain the uninterrupted operation during power failure. This paper studies the protection and control based on Crowbar low-voltage ride through of the operation of the control strategy, to limit the peak currents in the rotor during a voltage dip by Crowbar protection circuit, and the effects of voltage dip and bypass resistor values on the Crowbar protection is simulation analyzed. Simulation results show the Crowbar protection circuit in the voltage sag is effective, continuous operation of DFIG can be achieved.