Decoupling SVPWM (space vector pulse width modulation) based fault tolerance control method for open-winding PMSM (permanent magnet synchronous motor) driving system

Abstract

The invention provides a decoupling SVPWM (space vector pulse width modulation) based fault tolerance control method for an open-winding PMSM (permanent magnet synchronous motor) driving system. The method includes when a bridge arm of double inverters has an open-circuit fault, switching on a bidirectional thyristor between a motor phase endpoint, connected with the faulted bridge arm, and a direct-current-side filter capacitor midpoint to realize reconstruction of a topological structure; performing fault tolerance control on the reconstructed topological structure on the basis of decoupling SVPWM, performing SVPWM control on the inverter on the faulted side on the basis of a 90-degree coordinate system, and performing SVPWM control on the inverter on the normal side on the basis of a three-phase coordinate system with a, b and c phases. Compared with the prior art, the decoupling SVPWM based fault tolerance control method has the advantages that procedures after fault tolerance are simplified greatly, reference voltage vectors are proportionally distributed according to effective sectors of maximum output voltages of the inverters on the normal side and on the faulted side, and the utilization ratio of direct-current-side voltages of the inverters is maximized.

Description

technical field [0001] The invention relates to a fault-tolerant control after a single bridge arm of a three-phase open-winding PMSM double-inverter drive system is opened, and belongs to the control field of permanent magnet synchronous motors. Background technique [0002] In recent years, the dual-inverter topology has been successfully used in high-power drive systems such as aerospace and electric vehicles. For the drive system, the failure of the switching tube in the inverter accounts for a large part of all faults. Therefore, the dual-inverter topology The reliability and stability of the structure are related to the reliability and stability of the entire drive system, so it is necessary to study the fault-tolerant control of the dual-inverter topology. [0003] There have been literatures on the fault-tolerant control of PMSM drive system based on dual-inverter topology. These literatures mainly focus on fault-tolerant research on single-tube open-circuit faults, ...

AI Technical Summary

Problems solved by technology

For the fault-tolerant SVPWM, it is based on the 90-degree coordinate system and partition control. The overall modulation method tends to be consistent with the traditional SVPWM control. However, due to the particularity of the fault-reconfigured topology, the entire fault-tolerant control system is complicated.

[0005] For a three-phase open-winding PMSM drive system, after a single-arm open-circuit fault occurs, it is necessary to maintain the output torque capability of the PMSM and maximize the speed output capability after fault tolerance. Under normal operating conditions, it is based on the three-phase coordinates of a, b, and c The SVPWM control of the system cannot be applied to the control of the inverter on the fault side

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