A fault-tolerant control system and control method for double permanent magnet synchronous motors

Abstract

The invention discloses a dual-permanent magnet synchronous motor fault tolerance system and a control method thereof. Windings of two three-phase motors and a two-motor fault tolerance inverter are connected through thyristors; the windings of the two three-phase motors are connected through thyristors; three-phase reference voltage of the two three-phase permanent magnet synchronous motors is detected, after open circuit fault or short circuit fault is detected to happen to a switch transistor on a certain bridge arm, a corresponding thyristor is cut off, circuit connection is cut off, a thyristor of the connected bridge arm is opened, and reconstruction of a topology structure is realized; and then, according to the mathematical model of the reconstructed dual-inverter driving system after fault, reference voltage after fault tolerance is calculated and obtained, and switching from normal operation to fault tolerance operation after fault is thus realized. Switching of the dual-permanent magnet synchronous motor system from normal operation to fault tolerance operation after fault can be completed by only changing the topology structure of the inverter and the corresponding reference value.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a double permanent magnet synchronous motor fault-tolerant control system and a control method thereof. Background technique [0002] The dual-motor synergistic drive system has been widely used in many industries such as mines, metallurgy, and ports to improve the traditional single-motor drive with low reliability, poor control performance, complex mechanical transmission mechanism of the system, and high power requirements for a single motor. As we all know, in the AC motor drive system, the power electronic device in the power converter is the link most prone to failure. Once the switching device fails, the entire control system will lose the ability to work normally. Therefore, an effective fault-tolerant The operation plan can ensure that the controller has the ability to operate stably without interruption when a fault occurs, ensuring the safe operation of importa...

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Problems solved by technology

[0002] The dual-motor coordinated drive system has been widely used in many industries such as mines, metallurgy, and ports to improve the traditional single-motor drive with low reliability, poor control performance, complex mechanical transmission mechanism of the system, and high power requirements for a single motor.

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