A Direct Torque Control Method for Induction Motor Based on Non-smooth Control Technology

Abstract

The invention relates to a direct torque control method of an induction motor based on non-smooth control technology, including 1) adopting a constant stator flux linkage control method to establish an induction motor electromagnetic torque equation, analyzing the disturbance components of the system according to the electromagnetic torque equation, and determining Disturbance compensation object; 2) Realize the observation of system lumped disturbance based on finite time observer, and complete the estimation of system lumped disturbance; 3) According to the error state between the given speed and the feedback speed, establish the state equation of the error system, and use the finite Time control technology designs the feedback controller in the forward channel of the system to obtain a given electromagnetic torque; 4) establishes a direct torque control system for induction motors based on non-smooth control technology, and sets parameters reasonably. Advantages: 1) The introduction of finite time control technology accelerates the convergence speed of the system and improves the dynamic performance of the system. 2) The designed observer has simple structure, easy-to-implement algorithm, good dynamic performance and anti-jamming performance.

Description

technical field [0001] The invention is a novel induction motor direct torque control method based on non-smooth control technology, which belongs to the technical field of induction motor control. Background technique [0002] Induction motors are widely used in industrial production, transportation, metallurgy and other fields because of their simple structure, stable performance, and convenient manufacture. The control strategy of induction motor usually adopts vector control and direct torque control. Direct torque control is a speed regulation technology developed after vector control. It avoids the idea of ​​vector control current decoupling control, and uses two hysteresis comparators to control the flux and torque of the motor. It has torque It has the advantages of fast response, no need for coordinate transformation, and little dependence on motor parameters, so it is widely used in induction motor speed control systems. [0003] The induction motor is a multi-in...

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Problems solved by technology

The literature (Tianjin University. The compound speed control method of permanent magnet synchronous motor based on the continuous terminal sliding mode technology: China, CN201410520288.5[P]. 2014-9-30) adopts the continuous terminal sliding mode technology to design the feedback controller of the system. Make the system speed respond quickly, but this method involves more tuning parameters, and the algorithm implementation is more complicated

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