西华大学学报（自然科学版）2017，Vol.36Issue(2)：10-16,7.DOI:10.3969/j.issn.1673-159X.2017.02.03
提高DFIG低电压穿越能力的改进控制策略
Improved Control Strategy of Enhancing Low Voltage Ride Through Capability for DFIG
摘要
Abstract
When a short circuit fault occurs in the grid side connected the DFIG,the LVRT ability of DFIG based on the traditional crowbar technology is poor,and the DFIG need to absorb a mass of reactive power from the grid.Therefore,the terminal voltage is difficult to be recovered.In reaction to this technical disadvantage,an improved integrated control strategy is proposed.Firstly,through using DC-chopper in the basis of the crowbar technology,the DC bus overvoltage and the overcurrent of the rotor side can be limited during the fault stage.Secondly,a differential compensation term control of stator exciting current is introduced to the rotor side to enhance the mechanical stress of the system unit shaft.When a serious fault occurs in the grid,the improved GSC control strategy can be switched from normal operation mode to supporting mode of the reactive power,which compensates to the needed reactive power of the system and provides a part of reactive power to grid.A simulation model of grid-connected DFIG is built in the PSCAD/EMTDC platform.The experimental results show that,in different voltage dip,the proposed control strategy can improve the capability of low voltage ride through of DFIG.关键词
双馈感应发电机/DC-chopper/改进控制策略/无功支撑/低电压穿越Key words
doubly fed induction generator/DC-chopper/the improved control strategy/reactive support/low voltage ride through分类
信息技术与安全科学引用本文复制引用
杜健,卿朝进,陈洪源,童新..提高DFIG低电压穿越能力的改进控制策略[J].西华大学学报（自然科学版）,2017,36(2):10-16,7.基金项目
教育部春晖计划项目(Z2015113) （Z2015113）
四川省科技支撑计划项目(2015JY0138). （2015JY0138）
