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Phase loss control method for adaptively suppressing second 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, achieve high DC bus voltage utilization, optimize phase loss The effect of running performance

Active Publication Date: 2019-10-15
ZHEJIANG UNIV
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  • 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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  • Phase loss control method for adaptively suppressing second harmonic torque
  • Phase loss control method for adaptively suppressing second harmonic torque
  • Phase loss control method for adaptively suppressing second 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 noted that the following embodiments are intended to facilitate the understanding of the present invention, but do not limit it in any way.

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

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

[0031] The voltage equation when the three-phase motor works normally is:

[0032]

[0033]...

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Abstract

The invention discloses a phase loss control method for adaptively suppressing second harmonic torque. A doubled-frequency resonant controller is connected in parallel with an original current loop proportional integral controller PI and a space vector modulating wave SVPWM of the fault phase is duplicated to the neutral point of a motor to realize the method. The method is suitable for the operating mode of a three-phase permanent magnet synchronous motor in star connection with one lost phase. The improved current loop proportional integral resonant controller PIR can adaptively compensate for errors caused by parameter variations in a conventional feedforward compensation method. The duplicate modulating wave maintains the high DC bus voltage utilization rate of the SVPWM without changing the steady-state performance of the motor. The method can suppress the second harmonic torque caused by the parameter variation of the conventional feedforward method during the phase-loss operation.

Description

technical field [0001] The invention belongs to the field of permanent magnet motor control, in particular to an open-phase control method for adaptively suppressing harmonic torque caused by motor parameter changes. 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 the advantages of simple structure, fewer redundant components, no need for split capacitors, and the utilization rate ...

Claims

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Application Information

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Patent Type & Authority Applications(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