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Asynchronous motor low-speed performance improving method and system

A technology of asynchronous motor and motor speed, which can be used in control systems, control generators, motor control and other directions, and can solve problems such as instability of speed adaptive observers.

Inactive Publication Date: 2018-06-29
SHANGHAI INST OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method and system for improving low-speed performance of an asynchronous motor, which can solve the problem of instability of the existing rotational speed adaptive observer when the motor is running at low speed

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  • Asynchronous motor low-speed performance improving method and system

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Embodiment Construction

[0054] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] Such as figure 1 As shown, the present invention provides a method for improving the low-speed performance of an asynchronous motor, including:

[0056] Step S1, select the stator current and stator flux linkage of the asynchronous motor as state variables, and establish the state equation of the asynchronous motor under the two-phase stationary coordinates;

[0057] Step S2, based on the state equation and state estimation and state feedback in modern control theory, constructing a rotational speed adaptive flux linkage observer;

[0058] In step S3, based on Lyapunov's stability law, the self-adaptive algorithm is used to obtain the self-adaptive law of the motor speed, and the speed is estimated to obtain the observed s...

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Abstract

The invention provides an asynchronous motor low-speed performance improving method and system. A stator flux linkage psi s and stator current is of a motor are adopted as state variables, an asynchronous motor state equation is constructed, state estimation and state feedback in the modern control theory are utilized, the state equation of the asynchronous motor is used for constructing a rotating speed self-adaption flux observer, and according to the Lyapunov stability law, the rotating speed self-adaption law is derived. Due to the fact that a true value of the motor rotor flux linkage cannot be obtained, a traditional rotating speed self-adaption law ignores the rotor flux linkage value, when the motor is operated at low speed, a big error can be made, and the system is not stable. Inorder to solve the problem, the rotating speed self-adaption law needs to be improved, one compensation dosage is introduced, and the self-adaption flux observer can be stably operated when the motorrotates at low speed.

Description

technical field [0001] The invention relates to a method and system for improving low-speed performance of an asynchronous motor. Background technique [0002] At present, with the continuous anti-war of science and technology, the AC speed control theory has been continuously improved and has become the main speed control method. The more practical AC speed control methods include: speed open-loop constant voltage-frequency ratio control, speed closed-loop slip frequency control, vector control and direct torque control. Among them, vector control is most widely used in high-performance speed regulation occasions of asynchronous motors. In order to realize high-performance speed control of asynchronous motors, not only flux observation but also accurate speed information are required. Generally, the speed information is obtained by installing a speed encoder, but because there are flammable and explosive substances such as high temperature and dust in some environments, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/14H02P21/18H02P21/28H02P27/08
CPCH02P21/13H02P21/14H02P21/18H02P21/28H02P27/085H02P2205/01
Inventor 宗剑卢聪聪丰飞闫娜云
Owner SHANGHAI INST OF TECH
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