三相四桥臂辅助逆变器并联供电控制策略研究  

Research on Parallel Power Supply Control Strategy of Three-phase Four-leg Auxiliary Inverters

作　　者：姜新生 杨春宇 陈伟[2] 杨本瀚 JIANG Xin-sheng;YANG Chun-yu;CHEN Wei;YANG Ben-han(CRRC Xi'an Yongdian Jietong Electric Co.,Ltd.,Xi'an 710000,China;不详)

机构地区：[1]西安中车永电捷通电气有限公司,陕西西安710000 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力电子技术》2023年第5期5-8,共4页Power Electronics

摘　　要：轨道交通车辆传统辅助逆变器通常应用三相三桥臂逆变器拓扑,在不对称三相负载条件下导致输出电压波形的不对称。三相四桥臂逆变器通过第4桥臂提供额外的零序电流流经回路,可以实现三相对称输出电压。受特殊运行环境的限制,应采用无互联通信线的并联供电控制策略,如下垂控制。基于两台总额定功率为240 kVA的三相四桥臂逆变器,此处分析了不平衡负载条件下的协调控制策略,研究了虚拟阻抗的精确值以保证有功功率和无功功率解耦,并通过小信号建模分析设计了合适的下垂系数,以确保系统的稳定性和动态性能。最后此处给出了实验结果,以验证所提控制策略的有效性。Among traditional auxiliary inverters of rail transit vehicles,the three-phase three-leg inverters are usually installed and the asymmetric three-phase load conditions may lead to asymmetric output voltage waveforms.Threephase four-leg inverters provide an additional zero-sequence current passing loop through the fourth leg,and realizes three-phase symmetrical output voltage.Limited by the special operation environment,the parallel control strategy with no communication lines is preferred,such as droop control.Based on two three-phase four-leg inverters in parallel with a total rated power of 240 kVA,the coordinated control strategy under the unbalanced load conditions is analyzed.Then,the accurate value of virtual impedance for active and reactive power decoupling is studied.The appropriate droop coefficient is designed through small signal modeling analysis to ensure the system stability and dynamic performance.Finally,the experimental results are presented to verify the effectiveness of the proposed control strategy.

关 键 词：辅助逆变器 下垂控制 三相四桥臂逆变器 不平衡负载 

分 类 号：TM464[电气工程—电器]