Rotor resistance and stator resistance online identification method for induction motor used for low speed electric vehicles

Abstract

The invention provides a rotor resistance and stator resistance online identification method for an induction motor used for low speed electric vehicles. The identification for rotor resistance and the identification for stator resistance are realized based on an improved rotor flux linkage model and an improved stator flux linkage model respectively, and the identification precision is improved through interactive updating of the rotor resistance and the stator resistance. The rotor flux linkage voltage model is optimized by using a high-pass filter with variable cut-off frequency on the basis of the advantages of the rotor flux linkage model, so that the problems of direct current bias and integral saturation caused by a pure integral link are effectively avoided. Moreover, based on theonline identification of the improved stator flux linkage model for stator resistance, the identified stator resistance is fed back to the rotor flux linkage voltage model, so that the problem that the identification precision of rotor resistance is reduced by the change of the stator resistance is avoided. The method is applied to rotor flux linkage oriented vector control systems, so that the rotor flux linkage orientation is more accurate, efficient operation of a control system for the induction motor used for vehicles is guaranteed, and the dynamic property and reliability of the whole vehicle are improved.

Description

technical field [0001] The invention belongs to the field of motor control, and relates to a motor parameter identification method, in particular to an online identification method for the rotor resistance and stator resistance of an induction motor used in a low-speed electric vehicle. Background technique [0002] In recent years, as environmental pollution and energy problems have become increasingly serious, traditional fuel vehicles have been unable to meet the development trend of new-age vehicles due to their disadvantages such as low thermal efficiency and high pollution. Many countries have formulated fuel ban timetables, and my country is also formulating related plans. The state's support for electric vehicles and the release of related policies further indicate that pure electric vehicles have become one of the strategic development directions of my country's automobile industry. Electric vehicles are divided into high-speed vehicles and low-speed vehicles accord...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of reducing the overall performance of the induction motor control system for electric vehicles due to changes in motor parameters, and to find a simple and effective motor parameter identification scheme

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