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Polyphase induction motor appointed secondary current waveform control method

An induction motor, current waveform technology, applied in motor generator control, electronically commutated motor control, single motor speed/torque control, etc., can solve problems such as application limitations

Active Publication Date: 2014-01-01
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 of the specified secondary current waveform of the multi-phase induction motor.

Method used

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  • Polyphase induction motor appointed secondary current waveform control method
  • Polyphase induction motor appointed secondary current waveform control method
  • Polyphase induction motor appointed secondary current waveform control method

Examples

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Effect test

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 polyphase induction motor appointed secondary current waveform control method, comprising the following steps of A, current feedback value processing; B, current complex regulation; and C, voltage reference value determination. In the method, based on polyphase induction motor vector control, a polyphase motor current is mapped to a synchronous rotating coordinate system of mutually orthogonal fundamental waves and each usable subharmonic through polyphase synchronous rotating coordinate transformation, proportion integration resonance regulation and proportion integration regulation are respectively executed, and a complete current controller is formed by superposition; integration and resonance separation are respectively introduced so as to further improve the static and dynamic performances. The method has the advantages that the method is realized by digital control, and is simple and practical; the method can restrain the adverse impacts, such as motor loss, torque ripple and vibration noise, caused by a harmful harmonic current of the polyphase induction motor, can explore the positive effects of the usable harmonic, and gives full play to the advantages of the polyphase motor. The method can be used in the high-power alternating current motor driving occasions, such as marine propulsion, mining machinery and track hauling.

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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IPC IPC(8): H02P21/14H02P6/08H02M1/12
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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