摘要
随着风电场大规模接入电网,新的并网规范要求风力发电机组必须具有低电压穿越能力。双馈型异步发电机(DFIG)采用转子侧并联Crowbar电阻的方式限制电压跌落时转子产生的过电流,从而实现DFIG的低电压穿越运行。文章在推导了电网电压跌落下DFIG定转子电流数学模型的基础上,分析了Crowbar电阻对DFIG运行性能的影响,完成了Crowbar电阻的优化设计,以实现DFIG在电网电压跌落下的穿越运行。最后针对1.65 MWDFIG风电机组,建立了基于Matlab/Simulink的仿真模型,分析结果验证了所提方法的正确性和有效性。
As wind farms being coupled with power grid in large-scale,the new grid code is drafted to require the condition that wind turbines must have low voltage ride-through(LVRT) capability.To realize low voltage ride-through of doubly-fed induction generator(DFIG),Crowbar resistances in parallel are usually equipped to the rotor side to limit the over-current during the voltage dipping.Based on the currents mathematic models of the DFIG stator and rotor,the impact of Crowbar resistance on the DFIG operation performance is analyzed,and the optimized design strategy of the Crowbar resistance is implemented.Finally,the simulation model based on Matlab/Simulink is set up for 1.65 MW DFIG wind turbines,which validates the correctness and effectiveness of the proposed design technology.
出处
《大功率变流技术》
2012年第1期44-49,共6页
HIGH POWER CONVERTER TECHNOLOGY
