Permanent magnet traction motor control method based on hybrid multilevel inverter

Abstract

The invention discloses a permanent magnet traction motor control method based on a hybrid multilevel inverter. The method comprises the steps of: controlling a system according to train information;acquiring the control target of a permanent magnet traction motor; determining an operation mode of a hybrid multilevel inverter, respectively establishing a discretization model and a prediction model by adopting a multi-objective optimization model prediction control strategy, predicting a change condition of a control variable in a predetermined time period, determining an optimal switching state by minimizing a cost function, and driving a corresponding power switching tube to be switched on and switched off. Switching devices of different power units of the hybrid multilevel inverter arecontrolled to work in a low-frequency switching mode and a high-frequency switching mode respectively, the switching loss of the inverter is reduced, and the comprehensive optimization of switching frequency, flying capacitor voltage balance and output current harmonics is achieved at the same time, so that the control requirements of the high-speed rail permanent magnet traction system in a full-speed region and under various operating conditions are met.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet traction motor control, and in particular relates to a control method of a permanent magnet traction motor based on a hybrid multilevel inverter. Background technique [0002] The traction system is the "heart" of a high-speed train, and its performance determines the starting, braking and maximum speed of the train. Green and high efficiency is the eternal goal of the development of rail transit traction systems. Compared with asynchronous motor traction systems, permanent magnet synchronous motor traction systems have become the next generation due to their significant advantages such as low loss, high efficiency, good starting characteristics, strong acceleration performance and low noise. The development direction of the traction system is becoming the focus of global rail vehicle technology innovation. The permanent magnet traction system is mainly composed of traction transformer, ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the common problem of inverters in the permanent magnet traction system of high-speed trains in the prior art, the present invention provides a permanent magnet traction motor control method based on hybrid multilevel inverters to solve the problem of switching frequency of existing traction inverters. Low transmission efficiency and output power quality are difficult to further improve

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