Research on Current Loop Stability of Metro Permanent Magnet Traction System

doi:10.11985/2022.02.011

Abstract

Abstract:

In the context of metro permanent magnet traction system applications, the current control loop is prone to instability. Firstly, the current loop closed-loop transfer function of PMSM based on complex vector current controller is derived, and its decoupling performance under variable speed condition is discussed. Secondly, the influences of time delay and angle delay on the stability of the control system are analyzed according to the zero-pole diagram of the current-loop transfer function, and the stability boundary conditions are derived considering the digital control delay comprehensively. Then, the mechanical motion equation of permanent magnet synchronous motor is linearized, the closed-loop transfer function of the system is derived, the zero-pole diagram is drawn, and the stability boundary conditions under different working conditions are analyzed. Finally, experiments verify the correctness of the theoretical analysis.

Key words: Permanent magnet synchronous motor(PMSM), digital control delay, stability analysis, complex vector current controller

CLC Number:

TM351

MU Junwen, GE Xinglai, ZHU Dan. Research on Current Loop Stability of Metro Permanent Magnet Traction System[J]. Journal of Electrical Engineering, 2022, 17(2): 92-100.

Figures/Tables 19

References 17

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电机参数	数值	电机参数	数值
额定功率/kW	190	额定电压/V	926
额定电流/A	138	极对数	4
定子电阻/Ω	0.045 9	q轴电感/mH	3.96
d轴电感/mH	1.58	永磁磁链/Wb	0.683 8
额定转速/(r/min)	1 800	转动惯量/(kg·m²)	10