Rotor electric angle speed observation method for asynchronous motor
A technology for asynchronous motors and electrical angular velocity, which is applied in the control of generators, motor generators, electronically commutated motors, etc., and can solve problems such as poor robustness of parameters, poor dynamic performance, and slow convergence speed
Active Publication Date: 2016-09-07
HEFEI UNIV OF TECH
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to propose an asynchronous motor rotor electric motor for the problems of slow convergence speed, poor dynamic performance, poor parameter robustness, poor observation accuracy and difficult engineering implementation in the existing rotor electrical angular velocity observation technology. Angular velocity observation method to improve the observation performance of the rotor electrical angular velocity
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[0095] specific implementation plan
[0096] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.
[0097] Signal acquisition part, stator voltage vector v s The component v on the α axis sα , the stator voltage vector v s The component v on the beta axis sβ , the stator current vector i s Component i on the α axis sα , the stator current vector i s Component i on the β axis sβ By sampling the line voltage U between A and B AB , Line voltage U between C and B CB , stator A-phase current i A , stator B-phase current i B , stator C-phase current i C, and obtained by transforming the three-phase stationary ABC coordinate system to the two-phase stationary αβ coordinate system, such as figure 1 , where O is the origin of the coordinates.
[0098] A method for observing the electrical angular velocity of an asynchronous motor rotor in this embodiment includes the following steps:
[0099] Step 1, collect...
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The invention discloses a rotor electric angle speed observation method for an asynchronous motor. The electric angle speed observation method comprises the following steps: simplifying a gamma-type equivalent circuit by defining an intermediate current vector im, and establishing a state equation of the intermediate current vector im; then constructing a sliding mode observer about the intermediate current vector im, observing to obtain an equivalent sliding mode control quantity Ueq as a reference model, establishing a state equation of the equivalent sliding mode control quantity Ueq as an adjustable model, and obtaining a rotor electric angle speed observation value as shown in the specification through a model reference self-adaptive method. Meanwhile, a rotor electric angle speed feedforward value as shown in the specification obtained by the equivalent sliding mode control quantity Ueq is fused into the rotor electric angle speed observation value as shown in the specification to obtain a rotor electric angle speed final observation value as shown in the specification, so that the convergence speed and dynamic performance of the model reference self-adaptive method are promoted, and the disadvantages of direct calculation method parameter robustness are also overcome. Researches show that the rotor electric angle speed observation method for the asynchronous motor provided by the invention has better steady state and dynamic performance and higher parameter robustness.
Description
technical field [0001] The invention relates to a method for observing the electric angular velocity of an asynchronous motor rotor, in particular to a method for observing the electric angular velocity of an asynchronous motor rotor based on a sliding model observer and model reference self-adaptation. Background technique [0002] Asynchronous motors have the advantages of simple structure, maintenance-free, and good stability, and are widely used in industrial fields. Rotor electrical angular velocity is the necessary information for vector control of asynchronous motors. Obtaining rotor electrical angular velocity with a rotary encoder not only increases the cost, but also reduces system reliability due to complex hardware structure. People usually hope to observe the electrical angular velocity of the rotor in real time only through the easily measured current and voltage signal data on the frequency converter, so as to realize the speed sensorless control. [0003] In...
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IPC IPC(8): H02P21/18
Inventor 杨淑英李曦丁大尉谢震李浩源曹朋朋张兴
Owner HEFEI UNIV OF TECH
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