Asynchronous motor stator flux linkage and torque multi-time scale double-level voltage control method

Abstract

The invention discloses an asynchronous motor stator flux linkage and torque multi-time scale double-level voltage control method. The method comprises signal acquisition, stator resistance identification, flux linkage observation, standardized torque and reactive torque calculation, rotating speed and stator flux linkage outer loop control, standardized torque and reactive torque inner loop control, voltage feedforward compensation and SVPWM modulation. According to the invention, the reactive torque is provided, the reactive torque is corresponding to the reactive action component of the electromagnetic torque along the magnetic flux direction and the reactive power, a fast-changing reactive torque regulator and a torque regulator are arranged in an inner ring, a slow-changing rotating speed and flux linkage regulator is arranged in an outer ring, and the multi-time-scale hierarchical control of the system is realized; according to the independence of reactive power and resistance, the reactive torque eta is introduced into a stator resistance identification process by combining physical measurement based on a machine end and a calculation method of a mathematical model, so thatcontrol is more accurate; feedforward compensation is carried out on output utau1 * of an inner loop controller by adopting feedback linearization of torque and reactive torque, so that torque ripplesare reduced.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a multi-time-scale double-level voltage control method for stator flux linkage and torque of an asynchronous motor. Background technique [0002] Motors are the power source and core moving parts of high-end equipment such as electric vehicles, high-speed rail, industrial robots, aerospace, and wind power generation. Their quality is an important manifestation of the country's core competitiveness. Originated from the field oriented control (FOC) method proposed by Siemens in 1971, after nearly fifty years of improvement and development, various control structures based on vector control ideas have become increasingly mature and perfect, mainly including rotor flux linkage Orientation control, direct torque control and model predictive control, etc. [0003] The main problems of these control methods are: the precise modulation of the time-varying magnetic field and flux l...

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Problems solved by technology

[0003] The main problems of these control methods are: the precise modulation of the time-varying magnetic field and flux linkage amplitude has been neglected for a long time (for example, slip FOC adopts open-loop excitation control, and DTC flux linkage control adopts the same time scale as torque control); The internal mechanism of the interaction and fusion of space harmonics and time harmonics of the motor magnetic field, the internal relationship between modulation behavior and low harmonic electromagnetic torque, the unified theory of air gap magnetic field modulation, and the precise modulation of the magnetic field of high-quality motors have not been deeply excavated and analyzed.

[0004] The observation process of the stator flux linkage needs the participation of the stator resistance parameters. During the operation of the asynchronous motor, the stator resistance will rise slowly with the increase of the winding temperature. In the case of parameter mismatch, the uncertainty of the stator resistance will give the magnet The chain observer brings errors, and its observation accuracy greatly affects the control performance of the system

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