定子侧变阻值Crowbar的DFIG高电压穿越技术

DFIG High Voltage Ride Through Technology of Stator Side Variable Resistance Crowbar

随着风电技术的发展,双馈风力发电系统高电压穿越问题日益受到研究人员的重视。针对双馈风力发电系统高电压穿越问题,详细分析电网电压骤升时双馈风力发电机运行机理,提出了定子侧变阻值撬棒电路的高电压故障主动穿越方法。对投入撬棒电路后的双馈电机电磁暂态过程进行研究,确定定子撬棒电阻的阻值范围,基于已确定的阻值范围,提出定子侧撬棒保护电路的投切控制策略。最后通过Matlab/Simulink仿真得出双馈风力发电机在电压骤升故障时能更平稳地运转,并且能应对大幅电压骤升故障。验证了定子侧变阻值撬棒电路能够有效完成高电压穿越,提高了双馈风力发电系统的稳定性。

With the development of wind power technology,the problem of high voltage ride through of doubly fed wind power generation system has been paid more and more attention by researchers.Aiming at the problem of high voltage ride through of doubly fed wind power generation system,the operation mechanism of doubly fed wind power generator when the grid voltage rises suddenly is analyzed in detail,and a high voltage fault active ride through method of stator side variable resistance crowbar circuit is proposed.The electromagnetic transient process of doubly fed machine is studied after the crowbar circuit is put into operation,the resistance range of stator crowbar resistance is determined.Based on the determined resistance range,the switching control strategy of stator crowbar protection circuit is proposed.Finally,through Matlab/Simulink simulation,it is concluded that the doubly fed wind turbine operates more smoothly in case of voltage surge fault,and can deal with large voltage surge fault.It is verified that the stator side variable resistance crowbar circuit can effectively complete the high voltage ride through and improve the stability of the doubly fed wind power generation system.