摘要
双馈异步风电机组在电压跌落故障时多采用Crowbar保护电路以实现低电压穿越(LVRT),Crowbar阻值的选择对LVRT效果有较大影响,常规Crowbar阻值选择时需考虑转子绕组和转子侧变流器的绝缘水平。介绍了结合常规Crowbar技术和三相快速开关的低电压穿越技术方案,给出了无需考虑转子侧变流器耐压能力的Crowbar阻值的计算方法,并提出了风电机组LVRT的控制策略;基于Matlab/Simulink建立了结合开关和Crowbar保护的双馈异步风电机组机仿真模型,通过与常规Crowbar保护的仿真对比,验证了文中所提方法可有效提高双馈异步风电机组低电压穿越能力。
In the case of voltage sags in a grid, the Crowbar protection circuit is frequently adopted to implement the low vohage ride through （LVRT） of the grid connected wind-driven doubly fed induction generator （DFIG）. The LVRT effect is greatly influenced by the resistance of the Crowbar. The insulation level of rotor-side converter and rotor windings should be considered when choosing the value of the Crowbar resistance in conventional Crowbar technology. This paper introduces the new LVRT scheme which combines conventional Crowbar and three-phase high-speed switch, gives out the calculation method of the Crowbar resistance without considering the withstand voltage of the rotor-side converter, and proposes the control strategy of wind turbines LVRT. The simulation model of the wind-driven double-fed induction generator is established based on Matlab/Simulink. The simulation results show that the proposed method can effectively improve the LVRT capability of DFIG compared with the conventional Crowbar protection simulation.
作者
赵鹏
贾晶
王瑞琪
栾凤奎
于芃
李广磊
王鑫
张用
ZHAO Peng JIA Jing WANG Ruiqi LUAN Fengkui YU Peng LI Guangle WANG Xin ZHANG Yong(State Grid Shandong Electric Power Research Institute, Jinan 250002, China State Grid Corporation of China, Beijing 100043, China)
出处
《陕西电力》
2017年第3期17-22,共6页
Shanxi Electric Power
基金
国家自然科学基金项目资助(61503216)
关键词
双馈异步风电机组
CROWBAR
快速开关
低电压穿越
仿真
doubly fed induction generator （DFIG）
Crowbar
high-speed switch
low voltage ride-through
simulation
