【摘要】 为了优化双馈风电机组的低电压穿越(LVRT)性能,在现有LVRT技术的基础上,充分借鉴和参考了撬棒(Crowbar)保护、直流卸荷回路(Chopper)保护和定、转子变流器控制(RSC)在LVRT过程中的突出优点,提出了利用Crowbar保护抑制转子回路过流,发挥Chopper电路稳定直流母线电压的作用,及时退出Crowbar电阻并重新激发RSC,使之及时向电网提供无功支持,并结合仿真对综合保护控制策略的状态特性进行了分析。更多还原

【Abstract】 In order to optimize low-voltage ride through(LVRT) performance of double-fed wind turbines,the outstanding advantages of the Crowbar protection,DC unloading circuit(Chopper) protection and the stator and rotor converter control(RSC) in LVRT process were referenced based on the existing LVRT technology.In this paper,the Crowbar protection was used to curb rotor current,the Chopper circuit was used to stabilize the DC bus voltage,the Crowbar resistor was timely exited and RSC was re-energized so that timely provided reactive power to the grid,and the fault characteristics were analyzed combined with simulation under integrated control and protect strategy.更多还原