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A Phase Loss Control Method for Adaptively Suppressing Harmonic Torque

A technology of harmonic torque and control method, applied in the direction of torque ripple control, control system, control generator, etc., can solve problems such as second harmonic torque, and achieve the effect of high DC bus voltage utilization

Active Publication Date: 2022-08-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a phase loss control method for adaptive suppression of harmonic torque, which solves the second harmonic torque problem caused by inaccurate parameters in traditional feedforward compensation, thereby optimizing the performance of phase loss operation; in addition, by selecting Appropriate modulation wave maintains the voltage utilization ratio of SVPWM in the phase loss operation mode

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  • A Phase Loss Control Method for Adaptively Suppressing Harmonic Torque
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  • A Phase Loss Control Method for Adaptively Suppressing Harmonic Torque

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Embodiment Construction

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be pointed out that the following embodiments are intended to facilitate the understanding of the present invention, but do not have any limiting effect on it.

[0029] This embodiment and the accompanying drawings only describe the control method of the present invention in the lack of c-phase, but the present invention is also applicable to the open-circuit control method of other phases.

[0030] like figure 1 As shown, the present invention uses the inverter redundant topology of the three-phase four-bridge arm to realize the phase loss control of the motor. The topology has the advantages of few redundant devices, simple structure, no need for splitting capacitors, and at the same time, the original DC bus voltage utilization rate can be guaranteed.

[0031] The voltage equation for a three-phase motor in normal operation is:

[0...

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Abstract

The invention discloses a phase loss control method for adaptively suppressing the second harmonic torque. On the basis of the original current loop proportional-integral controller PI, a double-frequency resonance controller is connected in parallel and the space vector of the faulty phase is modulated. The wave SVPWM is copied to the neutral point of the motor for realization, which is suitable for the one-phase missing phase operation mode of the three-phase star-connected permanent magnet synchronous motor. The improved current-loop proportional-integral resonant controller PIR can adaptively compensate the error caused by the parameter change in the traditional feedforward compensation method. The replicated modulation wave can maintain the characteristic of high DC bus voltage utilization of SVPWM without changing the steady-state performance of the motor. With the present invention, the second harmonic torque caused by the parameter change of the traditional feedforward method can be suppressed during the phase-opening operation.

Description

technical field [0001] The invention belongs to the field of permanent magnet motor control, and in particular relates to a phase loss control method for adaptively suppressing harmonic torque caused by changes in motor parameters. Background technique [0002] In recent years, permanent magnet synchronous motors have been widely used because of their high torque density, high efficiency, and simple structure. In many fields such as military industry, aerospace and automobile, the high reliability of the motor is a crucial indicator. Therefore, the fault-tolerant operation of permanent magnet synchronous motors has gradually become one of the research hotspots, including various inverter fault-tolerant topologies and supporting fault detection and fault-tolerant operation control algorithms. Among them, the fault-tolerant topology of the three-phase four-leg inverter has attracted wide attention due to its simple structure, less redundant components, no need for split capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/10H02P21/00H02P21/20H02P27/12
CPCH02P6/10H02P21/0017H02P21/20H02P27/12
Inventor 吴立建郭昱亮方攸同
Owner ZHEJIANG UNIV