适用于DFIG连接到直流微网的双变换器设计与实现  

Design and Implementation of Dual-converter for Connecting DFIG to DC Microgrid

作　　者：苗晓阳 李冰然 傅洪全 MIAO Xiaoyang;LI Bingran;FU Hongquan(Hebi Power Supply Company,State Grid Henan Electric Power Company,Hebi 458030,China;Skills Training Center,State Grid Jiangsu Electric Power Co.,Ltd.,Suzhou 215000,China)

机构地区：[1]国网河南省电力公司鹤壁供电公司,鹤壁458030 [2]国家电网江苏省电力有限公司技能培训中心,苏州215000

出　　处：《电源学报》2024年第5期170-181,共12页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51877084)。

摘　　要：针对双馈感应式发电机DFIG(doubly-fed induction generator)-DC连接系统电流谐波严重、双VSI连接系统损耗大等问题,设计了1种将三相DFIG连接到直流微电网的新型双变换器连接系统。首先,详细阐述了双变换器连接系统的拓扑结构、脉宽调制PWM(pulse-width modulation)测量和DFIG模型等工作原理。与传统连接系统不同,所提连接系统采用开放端绕组结构,在定子绕组的每一侧使用1个三桥臂整流器,这些桥臂通常由绝缘栅双极晶体管IGBT(insulated gate bipolar transistor)组成,为了减少控制开关的数量和降低成本,采用二极管替代了1个整流器中的IGBT;然后,给出了新型拓扑结构下SSC和RSC的控制策略;接着,与DFIG-DC连接系统和双VSI连接系统在电流谐波畸变、转矩脉动和半导体损耗等方面进行了仿真比较,说明所提方法优越性;最后,针对0.56 kW DFIG进行实验验证,结果表明了所提方法在损耗、谐波以及转矩脉动的优势。In view of the serious current harmonics in a doubly-fed induction generator(DFIG)-DC connection system and the large loss of a dual-voltage source inverter(VSI)connection system,a novel dual-converter connection system which connects a three-phase DFIG to DC microgrid is designed.First,the topology,pulse-width modulation(PWM)measurement and DFIG model of the dual-converter connection system are described in detail.Different from the traditional connection systems,the proposed connection system adopts an open-end winding structure and uses a threebridge arm rectifier on each side of the stator winding.Considering that these arms are usually composed of insulated gate bipolar transistors(IGBTs),a diode is used instead of the IGBT in the rectifier to decrease the number of control switches and reduce the cost.Second,the control strategies for a stator-side converter(SSC)and a rotor-side converter(RSC)under the new topology are given.Third,a comparison with the DFIG-DC connection system and the dual-VSI connection system is performed through simulations,and results show the advantages of the proposed method in terms of current harmonic distortion,torque ripple and semiconductor loss.Finally,experimental verification was carried out on a 0.56 kW DFIG,and results also verified the advantages of this method in terms of loss,harmonics and torque ripple.

关 键 词：双馈感应发电机 定子侧变换器 转子侧变换器 转矩脉动 电流谐波 

分 类 号：TM28[一般工业技术—材料科学与工程]