电网电压骤升故障下双馈风力发电机变阻尼控制策略

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...

Variable Damping Based Control Strategy of Doubly Fed Induction Generator Based Wind Turbines Under Grid Voltage Swell

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.