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A Control Method for Specified Secondary Current Waveform of Multi-phase Induction Motor

A technology of induction motor and control method, applied in the direction of motor generator control, electronically commutated motor control, control system, etc., which can solve problems such as application limitations

Active Publication Date: 2016-02-24
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 of the specified secondary current waveform of the multi-phase induction motor.

Method used

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  • A Control Method for Specified Secondary Current Waveform of Multi-phase Induction Motor
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  • A Control Method for Specified Secondary Current Waveform of Multi-phase Induction Motor

Examples

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Embodiment 1

[0043] Example 1: Such as figure 1 , 2 Shown is a basic embodiment of the invention. A method for controlling a specified secondary current waveform of a multiphase induction motor, comprising the following steps:

[0044] A. Current feedback value processing: the current feedback value of each phase of the motor , which contains the fundamental and is superimposed on… l sub-available harmonics, h 1 …h n Harmful sub-harmonics, after multi-phase multi-synchronous rotating coordinate transformation, are mapped to the mutually orthogonal fundamental wave and each available sub-harmonic synchronous rotating coordinate system, and determine the fundamental wave and each sub-harmonic current in the fundamental wave and each available sub-harmonic synchronous rotating coordinate system dq component feedback value ; The available sub-harmonic current refers to the low-order harmonic current that can realize electromechanical energy conversion, optimize the air-gap magneti...

Embodiment 2

[0047] Example 2: It is a further embodiment of embodiment 1. The difference from Embodiment 1 is: the specified secondary current waveform control method of the multi-phase induction motor, its step A multi-phase multi-synchronous rotation coordinate transformation is according to the matrix T Realize coordinate transformation from multi-phase stationary coordinate system to multi-synchronous rotating coordinate system:

[0048]

[0049] matrix T in the following form:

[0050]

[0051] in, m is the number of phases, , is the angle between each phase, is the fundamental rotor flux vector and the stationary coordinate system a the phase angle of the phase axis, ,... l is the available harmonic order.

[0052] In the step B, under the synchronous rotating coordinate system of the fundamental wave and each available sub-harmonic, the fundamental wave and each available sub-harmonic current dq The components are all decoupled DC flow, and the proportional-inte...

Embodiment 3

[0077] Example 3: It 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 controlling the designated secondary current waveform of a multi-phase induction motor in this embodiment includes the following steps:

[0078] A. Current feedback value processing: the five-phase current feedback value of the motor , which contains the fundamental wave and three harmful harmonics are superimposed, after five-phase synchronous rotating coordinate transformation, it is mapped to the fundamental synchronous rotating coordinate system, according to the matrix T Realize the coordinate transformation from the five-phase stationary coordinate system to the fundamental synchronous rotati...

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Abstract

The invention relates to a method for controlling a specified secondary current waveform of a multi-phase induction motor, comprising the following steps: A, current feedback value processing; B, current compound adjustment; C, voltage reference value determination. It is based on multi-phase induction motor vector control, the multi-phase motor current is transformed by multi-phase multi-synchronous rotating coordinates, and mapped to the mutually orthogonal fundamental wave and each available sub-harmonic synchronous rotating coordinate system, and the proportional integral resonance adjustment and proportional Integral adjustment and superimposition form a complete current controller; and the introduction of integral and resonance separation further improves dynamic and static performance. The invention has the advantages of: it is realized by digital control, simple and practical; it can suppress the negative effects of motor loss, torque ripple and vibration noise caused by the harmful harmonic current of the multi-phase induction motor, so that the positive effects of the available harmonics can be explored and brought into full play. Advantages of multiphase motors. It can be used in high-power AC motor drive occasions such as ship propulsion, mining machinery, and track traction.

Description

technical field [0001] The invention belongs to the technical field of AC motors and their control, and in particular relates to a method for controlling a specified secondary current waveform of a multiphase induction motor to realize optimal control of current waveforms, and can be applied to ship propulsion, mining machinery, rail traction, steel rolling, fan pumps, etc. 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 tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/22H02P6/10
Inventor 姬凯槐博超徐明龙文枫李帆
Owner 中国船舶重工集团公司第七一二研究所
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