On-line Identification and Optimization Method of Traction Motor Rotor Parameters Oriented to Vector Control System

Abstract

The invention relates to an on-line identification optimization method for traction motor rotor parameters for a vector control system. The on-line identification optimization method comprises the following steps that (1) an initial value of the traction motor parameters is obtained in an off-line stationary state; (2) a voltage component and a current component in a two-phase rotating coordinatesystem are obtained in a normal operation state, and the rotor speed of a motor is converted into the angular speed; (3) a state equation is obtained according to a voltage of the traction motor and aflux linkage equation; (4) the state equation is converted into a matrix form after derivation, and the parameter identification of the recursive least-squares method is carried out; (5) the motor isin the state of the speed fluctuation, a voltage type flux linkage observation model is taken as a reference model, a current flux linkage observation model is taken as an adjustable model, a self-adaptive mechanism is constructed for the identification after the designed models refers to the self-adaptive law of the self-adaptive method, and a rotor resistance value is obtained. Compared with the prior art, the on-line identification optimization method has the advantages of high adaptability, high practicability, reliability and safety, high anti-disturbance capability and the like.

Description

technical field [0001] The invention relates to the field of vector control of traction motors, in particular to an online identification and optimization method for rotor parameters of traction motors oriented to vector control systems. Background technique [0002] In the traction drive system of high-speed trains, AC asynchronous traction motors are widely used because of their simple structure, good mechanical properties, and low maintenance. However, due to the electromagnetic characteristics of high-order nonlinear strong coupling of the traction motor, its control is difficult. At present, the control methods of the traction motor AC speed control system mainly include constant voltage frequency ratio control (V / F control), slip frequency control, vector control, direct torque control, etc. Among them, the rotor field oriented vector control technology can realize the flux linkage and the rotation speed. At the same time, its control method is simple, with good dynam...

AI Technical Summary

Problems solved by technology

In addition, with the development of intelligent control theory, some intelligent algorithms such as fuzzy control method, neural network method, genetic algorithm, etc. have also been applied to the field of parameter identification, which have good accuracy, convergence and robustness. performance, but the amount of calculation is too large, the method is too complicated, and the requirements for the processor are quite high, which makes it have great shortcomings in practicability and feasibility, and related methods and technologies need to be further improved.

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