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Open phase control method for suppressing second harmonic torque

A second harmonic and control method technology, applied in the control system, control generator, motor control and other directions to achieve the effect of suppressing the second harmonic torque

Active Publication Date: 2019-09-10
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 suppressing the second harmonic torque, which solves the problem of the second harmonic torque caused by the third harmonic counter electromotive force under the phase loss operation of the three-phase motor, thereby optimizing the phase loss operation performance

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  • Open phase control method for suppressing second harmonic torque
  • Open phase control method for suppressing second harmonic torque
  • Open phase control method for suppressing second harmonic torque

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Embodiment Construction

[0031] 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 embodiments described below are intended to facilitate the understanding of the present invention and do not have any limiting effect on it.

[0032] This embodiment and the drawings only illustrate the i d =0 The control method of the lack of c-phase under the control strategy, but the present invention is also applicable to other control strategies and other phase-opening control methods.

[0033] Such as figure 1 As shown, the present invention uses a three-phase four-leg inverter redundancy topology to realize the lack of phase control of the motor. This topology has the advantages of few redundant devices, simple structure, and can guarantee the original DC bus voltage utilization rate.

[0034] Traditional i d =0 The vector diagram of the lack of c-phase control current is as figure 2 Shown. The ab-phase current ...

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Abstract

The invention discloses an open phase control method for suppressing the second harmonic torque. The second harmonic torque is suppressed by injecting a third harmonic current into healthy phases. Thethird harmonic current is injected into the healthy phases by adding a harmonic current injection calculation module, a current proportional integral resonance controller, a zero-axis modulation voltage calculation module and a speed low-pass filter under a vector control framework. The harmonic current injection calculation module calculates a reference harmonic current to be injected in a rotating coordinate system. The current proportional integral resonance controller and the zero-axis modulation voltage calculation module realize the injection of the harmonic current. The speed low-passfilter module is used to reduce the input error of the harmonic current injection calculation module. By using the method of the invention, the problem of second harmonic torque caused by the back electromotive force of third harmonic of a three-phase motor under open-phase operation can be solved.

Description

Technical field [0001] The invention belongs to the field of permanent magnet motor control, and in particular relates to a lack of phase control method for suppressing the second harmonic torque caused by the third harmonic back electromotive force. Background technique [0002] Permanent magnet synchronous motors are widely used because of their simple structure, high efficiency, and high torque density. In recent years, the fault-tolerant control of permanent magnet synchronous motors has become one of the research hotspots, because the automotive, aviation and other fields require high reliability. A variety of fault-tolerant inverter topologies and their corresponding fault-tolerant algorithms have been extensively studied. Compared with other topologies, the three-phase four-leg inverter topology has fewer redundant components, simple structure, and maintains the advantages of the original DC bus voltage utilization rate. [0003] Motor phase loss operation is a fault-toler...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/20H02P29/50H02P29/028
CPCH02P21/14H02P21/20H02P29/028H02P29/50
Inventor 吴立建郭昱亮方攸同
Owner ZHEJIANG UNIV