Sliding-mode observer based flux linkage observation method of asynchronous motor

A technology of sliding mode observer and asynchronous motor, which is applied to the control of generators, motor generators, electronically commutated motors, etc. It can solve problems such as difficult engineering applications, discontinuous control items, and easy DC bias.

Active Publication Date: 2016-05-25
HEFEI UNIV OF TECH
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Problems solved by technology

Among them, the scheme of obtaining the rotor flux linkage based on the back electromotive force has good rotor resistance robustness, but the first-order current sliding mode observer needs to filter the control items to obtain the back electromotive force, which affects the accuracy of the flux linkage observation , and the inductance parameter robustness is poor
In response to these problems, some scholars have carried out further research on this scheme. The main methods are: 1. Design a continuous sliding mode observer to solve the problem of discontinuity in th

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  • Sliding-mode observer based flux linkage observation method of asynchronous motor
  • Sliding-mode observer based flux linkage observation method of asynchronous motor
  • Sliding-mode observer based flux linkage observation method of asynchronous motor

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Embodiment Construction

[0070] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0071] In the signal acquisition part, the stator voltage vector V and the stator current vector i are obtained by sampling the stator line voltage U ab , stator line voltage U cb , Stator A-phase current i A , Stator B-phase current i B , Stator C-phase current i C , and obtained through the transformation from the three-phase stationary coordinate system to the two-phase stationary coordinate system, the actual rotor electrical angular velocity ω r It is obtained by using a photoelectric rotary encoder. The present embodiment carries out as follows:

[0072] Step 1, collect the stator voltage vector V, stator current vector i, and rotor electrical angular velocity ω of the asynchronous motor in the stationary coordinate system αβ r ;

[0073] Step 2, establish the state space expression of the asynchronous motor under the stationary coordinate...

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Abstract

The invention discloses a sliding-mode observer based flux linkage observation method of an asynchronous motor. The flux linkage observation method is characterized by comprising the following steps of acquiring a continuous counter electromotive force e by Omega<r> through a high-order current sliding-mode observer according to a stator voltage vector v, a stator current vector i and a rotor electric angular speed, which are obtained through acquisition and operation, of the motor under a two-phase static coordinate AlphaBeta; building a state space expression of the asynchronous motor according to a relation between the counter electromotive force and rotor flux linkage; and building a flux linkage sliding mode observer according to the space expression. By the flux linkage observation method, the integral problem in flux linkage observation is solved, and relatively high robustness is generated for parameters such as rotor resistance, excitation inductance, rotor inductance and stator inductance; and meanwhile, the observer is simple in design, and engineering implementation is easy.

Description

technical field [0001] The invention relates to a flux observer, in particular to an asynchronous motor rotor flux sliding mode observer. Background technique [0002] With the gradual depletion of fossil energy and the increasingly serious problems caused by the greenhouse effect, the development and utilization of new energy has gradually become a research hotspot. In recent years, electric vehicles, as an energy-saving and environmentally friendly means of transportation, have been highly valued by the government. Induction motor (IM) has the most extensive application prospects in the field of electric vehicles due to its good stability, simple structure, maintenance-free, wide speed range and other advantages. [0003] The IM speed control system in industrial applications is generally composed of a current loop and a speed loop. The output of the speed loop is used as the setting of the current loop, so that it has better tracking performance for the speed. However, ...

Claims

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Application Information

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IPC IPC(8): H02P21/13
CPCH02P21/13
Inventor 杨淑英丁大尉李曦张兴谢震
Owner HEFEI UNIV OF TECH
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