基于牵引PMSM的地铁直流侧振荡抑制策略探讨

Discussion on DC Side Oscillation Suppression Strategy for Metro Based on Traction PMSM

在地铁永磁牵引系统中,逆变器直流侧的负阻抗特性降低了系统阻尼,导致牵引逆变器直流侧易发生电压振荡,从而影响牵引系统的稳定性。为此,建立地铁牵引逆变器直流侧数学模型及小信号模型,得到了直流侧系统的稳定条件,进而提出基于q轴电流补偿的直流侧电压振荡抑制策略,并应用于系列化标准地铁牵引永磁同步电机(PMSM)的控制系统中。通过MATLAB/Simulink仿真及在中车大连电力牵引研发中心有限公司试验中心进行试验,表明基于q轴电流补偿的直流侧电压振荡抑制策略应用在牵引永磁同步电机控制系统中具有较好的性能,牵引变流器直流侧电压振荡得到有效抑制,直流侧电压、d轴电流和q轴电流变化平稳。

In metro permanent magnet traction system,the negative impedance characteristic of the DC side of the inverter reduces the system damping,resulting in voltage oscillation on the DC side of the traction inverter,which affects the stability of the traction system.Therefore,the mathematical model and small signal model of the DC side of the subway traction inverter are established,and the stability conditions of the DC side system are obtained.Furthermore,a DC side voltage oscillation suppression strategy based on q-axis current compensation is proposed and applied to the control system of serialized standard subway traction permanent magnet synchronous motor(PMSM).Through MATLAB/Simulink simulation and test in the test center of CRRC Dalian Electric Traction R&D Center Co.,Ltd.,it is shown that the DC side voltage oscillation suppression strategy based on q-axis current compensation has good performance in the traction permanent magnet synchronous motor control system,the DC side voltage oscillation of the traction converter is effectively suppressed,and the DC-side voltage,d-axis current and q-axis current change smoothly.