Fault-tolerant control method for open circuit fault of switched reluctance motor

Abstract

The invention discloses a fault-tolerant control method for open circuit faults of a switched reluctance motor, and the method is realized through a three-phase four-leg switched reluctance motor fault-tolerant control system. The three-phase four-bridge-arm switched reluctance motor fault-tolerant control system comprises a three-phase switched reluctance motor, a direct-current power supply and a four-bridge-arm inverter, a winding adopts a star-shaped connection mode, a neutral point of the winding is connected with a fourth bridge arm, and the three-phase four-bridge-arm switched reluctance motor fault-tolerant control system is used for solving the problem that a power conversion device has an open-circuit fault when a switched reluctance motor driving circuit works. Fault-tolerant control can be carried out on open circuit of a single switch tube, fault-tolerant control can be carried out on open circuit of any two tubes which are not on the same bridge arm, it is guaranteed that the performance of a motor system is basically unchanged compared with normal operation, and the fault-tolerant control circuit is simple in circuit wiring, low in cost, and high in winding utilization rate. The fault-tolerant operation of the power converter after the open-circuit fault is effectively realized, and the reliability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of power converters of switched reluctance motors, in particular to a fault-tolerant control method for open circuit faults of switched reluctance motors. Background technique [0002] The switched reluctance motor has a solid and simple structure and low cost. The three-phase switched reluctance motor system with bipolar control has simple wiring, wide speed range, and small torque ripple. It is suitable for high-speed and harsh environments. However, due to the aging of components, overcurrent and overvoltage, etc., faults are inevitable during the operation of the motor. As the central actuator of the system control, the power converter and its drive circuit are the most prone to faults in the system. The weak link of the power converter, the failure of the power converter will destroy the balance state of the drive system, and produce an irrepressible torque gap or even braking torque. Long-term fault op...

AI Technical Summary

Problems solved by technology

However, due to the aging of components, overcurrent and overvoltage, etc., faults are inevitable during the operation of the motor. As the central actuator of the system control, the power converter and its drive circuit are the most prone to faults in the system. The weak link of the power converter, the failure of the power converter will destroy the balance state of the drive system, and produce an irrepressible torque gap or even braking torque. Long-term fault operation will cause damage to the entire system. Therefore, when the power converter fails in the system It is necessary to implement fault-tolerant control

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