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A Method for Suppressing Specified Subharmonic Current of Multiphase Induction Motor

A technology for induction motors and current suppression, which is applied in motor control, motor generator control, electronic commutation motor control, etc., and can solve problems such as application limitations

Active Publication Date: 2016-06-01
中国船舶重工集团公司第七一二研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Application is limited due to adverse effects of harmful sub-harmonic currents in polyphase induction motors
At present, there are few corresponding technical literature reports on the control strategy to solve the specified sub-harmonic current suppression of multi-phase induction motors.

Method used

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  • A Method for Suppressing Specified Subharmonic Current of Multiphase Induction Motor
  • A Method for Suppressing Specified Subharmonic Current of Multiphase Induction Motor
  • A Method for Suppressing Specified Subharmonic Current of Multiphase Induction Motor

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Embodiment 1

[0038] Embodiment 1: as figure 1 , 2Shown is a basic embodiment of the invention. A method for suppressing a specified harmonic current of a polyphase induction motor, comprising the following steps:

[0039] A. Current reference value processing: Rotor flux orientation vector control based on multi-phase induction motor multi-synchronous rotating coordinate system, according to the motor speed ω r and rotor flux linkage ψ r Proportional-integral adjustment results determine the ratio and phase relationship of the motor fundamental wave and available sub-harmonic currents, extract the current excitation components in their respective synchronous rotating coordinate systems to produce the desired flux density waveform, and obtain the fundamental wave and available sub-harmonic currents in their respective synchronous The reference value of the dq component of the rotating coordinate system And let the dq component reference value of the specified harmful sub-harmonic curre...

Embodiment 2

[0043] Embodiment 2: is the further embodiment of embodiment 1. The difference from Embodiment 1 is that the multi-phase and multi-synchronous rotating coordinate transformation in the step B is to realize the coordinate transformation from the multi-phase static coordinate system to the multi-synchronous rotating coordinate system according to the matrix T:

[0044] [i dl i ql …i dn i qn ] T =T (n+1)×m [i a i b …i m ] T

[0045] The matrix T is as follows:

[0046]

[0047] Among them, n is the highest order of the specified harmful harmonic, m is the number of phases, ζ=2π / m, is the angle between each phase, θ 1 is the phase angle between the fundamental rotor flux vector and the a-phase axis of the stationary coordinate system, θ 3 =3θ 1 , θ 5 =5θ 1 ,...=...,θ n =nθ 1 .

[0048] The inverse transformation of the multiphase and multisynchronous rotating coordinates in the step D is the inverse matrix T of the matrix T -1 Realize coordinate transformatio...

Embodiment 3

[0059] Embodiment 3: is a preferred embodiment of the present invention. Multi-phase induction motor is a five-phase sinusoidal open-winding power supply induction motor. The fundamental wave current realizes electromechanical energy conversion, and the third harmonic current does not produce electromechanical energy conversion, so it is the object of suppression. The method for suppressing the specified sub-harmonic current of a multi-phase induction motor in this embodiment includes the following steps:

[0060] A. Current reference value processing: based on the rotor flux oriented vector control of the fundamental synchronous rotating coordinate system of the five-phase induction motor, according to the motor speed ω r and rotor flux linkage ψ r Proportional-integral adjustment results, determine the reference value of the dq component of the motor fundamental wave in its synchronous rotating coordinate system And make the dq component reference value of the specified t...

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Abstract

The invention relates to a multi-phase induction motor-specific subharmonic current suppression method, which includes the following steps: (A) current reference value processing; (B) current feedback value processing; (C) current regulation; (D) voltage reference value determination. Based on the vector control of a multi-phase induction motor, the method maps the current of the multi-phase motor into a corresponding synchronous rotating reference frame of a fundamental wave and each subharmonic orthogonal to each other by multiple synchronous rotating coordinate transformations, and uses proportional-integral controllers to respectively carry out tracking with zero steady-state error and combine to form an integral current controller. The method has the advantages that trapezoidal integration is adopted to increase integral accuracy, and supplemented by variable structure control, appropriate self-adaptive compensation is introduced to resist control saturation, so that static and dynamic performance is further enhanced; the method can suppress motor loss caused by the harmful subharmonic current of the multi-phase motor and the adverse affection of torque ripple, vibration noise and the like, and can utilize the positive effect of usable subharmonic; the method takes full advantage of the multi-phase motor, and enhances system performance.

Description

technical field [0001] The invention belongs to the technical field of AC motors and their control, and in particular relates to a multi-phase induction motor specified sub-harmonic current suppression method to realize optimal control of current waveforms, which can be applied to ship propulsion, mining machinery, rail traction, steel rolling, fan pumps Such as speed regulation and other high-power AC motor drive occasions. Background technique [0002] AC motors, especially cage induction motors, have been widely used for their simple structure, easy maintenance and low cost. The increasingly prominent energy problem makes the use of variable speed drives to reduce the waste and loss of high-power AC motors that account for a large proportion of power consumption to achieve energy conservation and emission reduction, which has great economic and social significance and has attracted increasing attention. [0003] With the development of power electronics technology, multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P21/22H02P29/50
Inventor 姬凯槐博超朱军周艳红李强
Owner 中国船舶重工集团公司第七一二研究所
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