摘要
双馈风力发电机在电网电压跌落情况下的不间断运行已成为当前研究热点,而电网电压骤升对双馈风力发电系统的运行也构成了威胁。为研究双馈风力发电机的高电压穿越特性及其控制策略,分析了电网电压骤升激起的双馈感应发电机的电磁过渡过程。针对不同转速和电网电压骤升幅度对系统的影响,提出一种基于变阻尼的转子励磁控制策略,减小了故障情况下转子电流和电磁转矩的冲击,避免了撬棒电路的频繁动作。仿真和实验结果验证了所提出控制策略的有效性,与常规的有源阻尼控制策略相比,提高了双馈风力发电机的高电压穿越能力。
The control strategy of doubly fed induction generator（DFIG） under grid voltage dips has long been a focus of research and development,grid voltage swells will also cause a lot of problems to DFIG based wind turbines.In order to study the characteristic and control strategy of high voltage ride through（HVRT） of DFIG,this paper analyzes the dynamic behavior of DFIG during grid voltage swells.Based on the above analysis,it is found that the active resistance can effectively suppress the rotor current and torque oscillation,avoiding the operation of Crowbar circuit.As to the different speed and grid voltage swell ratios,this paper proposes variable damping based control strategy,enhancing DFIG＇s HVRT capability compared with grid voltage dips.Simulation and experimental results verify the effectiveness of the variable damping based control strategy.
出处
《电力系统自动化》
EI
CSCD
北大核心
2012年第3期39-46,共8页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51077034)
安徽省高等学校省级自然科学研究项目(2011AJZR0063)
安徽省自然科学基金资助项目(090412049)~~
关键词
风力发电
双馈感应发电机
变阻尼控制
高电压穿越
wind power
doubly fed induction generator（DFIG）
variable damping based control
high voltage ride through（HVRT）
