Induction motor feedback type indirect vector control system and control method thereof

Abstract

The invention relates to induction motor feedback type indirect vector control system and a control method thereof.The control system includes a speed controller, an Lm parameter division arithmetic unit, an addition operation controller, an integral controller, a division operation controller, a Tr parameter division arithmetic unit, a high cut-off frequency low-pass filter, a three-phase static/two-phase rotating coordinate transformation circuit, a two-phase rotating/three-phase static coordinate transformation circuit, a current hysteresis tracking PWM signal generator, a voltage source inverter and an induction motor.Compared with the prior art, the induction motor feedback type indirect vector control system needs an Lm parameter multiplication arithmetic unit and a rotor time constant Tr inertial link circuit no longer, and the high cut-off frequency low-pass filter is added, so that the problem that the rotor flux linkage vector amplitude of a traditional control system monotonically rises, dynamic response is slow and the induction motor cannot perform constant acceleration and quick starting at an accelerating-starting stage, and the dynamic response of the induction motor feedback type indirect vector control system is improved.

Description

technical field [0001] The invention relates to the field of induction motor AC speed regulation, in particular to an induction motor feedback type indirect vector control system and a control method using vector control technology. Background technique [0002] Variable speed drives are commonly used in industry. Among the control objects of speed-adjustable drives, induction motors are used most. It should be said that the standard configuration of speed control drives is induction motors, and recently permanent magnet synchronous motors have also been used. Variable speed drives are widely used in water pumps, fans, elevators, electric vehicles, heating and air conditioning, robots, wind power systems and ship propulsion. [0003] In the early days, DC motors were generally preferred for variable speed drives. However, DC motors have disadvantages such as high price, large rotor inertia and difficult maintenance of brush commutators. In addition, DC motors cannot oper...

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Problems solved by technology

[0034] The purpose of the present invention is to provide an induction motor feedback indirect vector control system and its control method to solve the problems of the traditional feedback indirect vector control system of induction motors, such as the monotonous rise of the rotor flux vector amplitude and the slow dynamic response and the inability of the electromagnetic torque. Keeping a constant maximum value and the induction motor cannot start quickly at the acceleration start stage, so that the induction motor starts at a constant acceleration and fast start like a DC double closed-loop speed control system, which improves the performance of the traditional feedback indirect vector control system of the induction motor Dynamic response, making the dynamic performance of the system reach the level of DC double closed-loop speed control system

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