基于单电流传感器的改进相电流重构技术  

Improved phase current reconstruction technology based on single current sensor

作　　者：徐航 肖曦[1] 谢玉龙 王潇 曾萍 刘志刚 XU Hang;XIAO Xi;XIE Yulong;WANG Xiao;ZENG Ping;LIU Zhigang(Department of Electrical Engineering,Tsinghua University,Beijing 100080,China;Ji’an Power Supply Company,State Grid Jiangxi Electric Power Co.,Ltd.,Ji’an 343000,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京100080 [2]国网江西省电力有限公司吉安供电分公司,江西吉安343000

出　　处：《电力自动化设备》2024年第6期96-101,共6页Electric Power Automation Equipment

基　　金：国家电网公司总部科技项目(5500⁃202199520A⁃0⁃5⁃ZN)。

摘　　要：在电机闭环控制过程中,电流传感器故障、不同电流传感器的不一致性等因素可能导致系统失稳。为提高系统的容错能力,减小故障对控制系统稳定性的影响,提出一种基于单电流传感器的改进相电流重构技术。通过移动脉宽调制的脉冲矢量来消除母线电流采样盲区,进而通过母线电流重构获得三相电流。相比于传统电流重构方法,所提改进方法重构的电流更接近真实电流值,能够减小电流总谐波,降低电磁转矩脉动,提升系统的稳态性能。通过仿真和实验对比2种重构方法,证明了所提改进方法的优势。结果表明所提改进方法能有效实现电流重构,提升系统稳态性能。In the process of motor closed-loop control,the failure of current sensors and the inconsistency of different current sensors may lead to the instability of the system.In order to improve the fault tolerance of the system and reduce the influence of faults on the stability of the control system,an improved phase current reconstruction technology based on single current sensor is proposed.By shifting the pulse vector of pulse width modulation,the sampling blind area of the bus bar current is eliminated,and then the threephase current is reconstructed through the bus bar current.Compared with the traditional current reconstruction method,the current reconstructed by the proposed improved method is closer to the real current value,which can reduce the total current harmonics and the electromagnetic torque ripple,and improve the steadystate performance of the system.Two reconstruction methods are compared by simulation and experiment,which verifies the advantages of the proposed improved method.The results show that the improved method can effectively reconstruct the current and improve the steady-state performance of the system.

关 键 词：母线电流 相电流重构 脉冲移位 单电流传感器 电流信号采样 矢量合成 

分 类 号：TM301.2[电气工程—电机]