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Dual three-phase motor system fault tolerance control method based on five-bridge-arm inverter driving

A system fault-tolerant and control method technology, applied in the field of fault-tolerant control of dual-three-phase motor systems, can solve problems such as complex implementation, increased stator copper consumption, and large torque ripple, and achieve easy implementation, reduced torque ripple, and realization of busbars The effect of voltage utilization

Inactive Publication Date: 2018-07-24
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a fault-tolerant control method for a dual-three-phase motor system driven by a five-leg inverter, which solves the problems of increased stator copper loss, large torque ripple and complicated implementation in the prior art

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  • Dual three-phase motor system fault tolerance control method based on five-bridge-arm inverter driving
  • Dual three-phase motor system fault tolerance control method based on five-bridge-arm inverter driving
  • Dual three-phase motor system fault tolerance control method based on five-bridge-arm inverter driving

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] combine figure 1 , figure 2 As shown, the fault-tolerant control method of the dual three-phase motor system driven by the five-leg inverter is implemented according to the following steps:

[0059] step 1, figure 2 A block diagram for the implementation of the dual zero-sequence injection PWM strategy for the dual-three-phase motor drive system. First, the dual-three-phase motor system α-β and z 1 -z 2 The reference voltage of the sub-plane is decoupled and inversely transformed by the vector space to obtain the reference value of the voltage of each phase, and then a certain zero-sequence component is injected into the voltage of each phase, and finally the obtained voltage of each phase is compared with the triangular carrier to output the PWM waveform. The following steps are implemented:

[0060] The mean zero-sequence comp...

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Abstract

The invention discloses a dual three-phase motor system fault tolerance control method based on five-bridge-arm inverter driving. The concrete method comprises the steps that a five-bridge-arm inverter driving dual three-phase permanent magnet synchronous motor system dual zero sequence voltage injection PWM strategy is put forward, the mean continuous PWM (pulse width modulation) mode is adoptedand the bus voltage utilization rate is analyzed. The strategy has the advantages of easy implementation and implementation of maximum bus voltage utilization. The method can be used as a novel faulttolerance control method after failure of one phase of bridge arm of the six-bridge-arm inverter of the normal dual three-phase motor driving system. Compared with the commonly used open phase fault tolerance operation method, the method has the advantages of no increasing of stator copper loss, reducing torque ripple and easy implementation. Meanwhile, the invention also discloses the circuit topology of the dual three-phase motor for online switching from six-bridge-arm operation to five-bridge-arm operation.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a fault-tolerant control method for a dual-three-phase motor system driven by a five-bridge-arm inverter. Background technique [0002] With the rapid development of power electronic conversion technology, multi-phase (phase number > 3) motor drive systems and their control methods have received extensive attention in the field of high-power and high-reliability AC drives. Among all kinds of multi-phase motors, six-phase motors have received more attention due to their close relationship with traditional three-phase motors. The asymmetrical six-phase motor (double three-phase motor with 30° phase shift) obtained by splitting the phases of the three-phase motor with a phase belt angle of 60° has greater advantages due to smaller torque ripple. Being suitable for fault-tolerant operation is an important application characteristic of multi-phase motors. At pres...

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Application Information

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IPC IPC(8): H02P21/05H02P21/24H02P27/08H02P29/028
CPCH02P21/05H02P21/24H02P27/08H02P29/032
Inventor 周长攀周兆吉孙向东唐伟
Owner XIAN UNIV OF TECH
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