A speed pulsation suppression method for rail transit based on flux switching linear motor

Abstract

The invention discloses a flux-switching linear motor based rail transit velocity fluctuation inhibition method. Metro vehicles can operate in variable speeds and constant speeds during operation; in order to achieve the purpose of inhibiting positioning forces and velocity fluctuation, when the metro vehicles operate in variable speeds, a novel control strategy that a method of a position x-domain repetitive controller in combination with an R-PI regulator is used to inhibit the positioning forces is provided, wherein the method comprises the steps that firstly, a time-varying t-domain signal is converted into an x-domain signal with a fixed cycle, and the x-domain signal is subjected to designing of the repetitive controller; when the metro vehicles operate in constant speeds, the method of a time t-domain repetitive controller in combination with the R-PI regulator is used; meanwhile, in order to accurately obtain position and speed information of a linear flux-switching permanent magnet motor (LFSPM), a position recursive control algorithm is provided for replacing position sensor technology.

Description

technical field [0001] The invention relates to a rail transit speed pulsation suppression method based on a magnetic flux switching linear motor. According to the different speeds of rail vehicles, an x-domain repetitive controller or a t-domain repetitive controller is switched, and at the same time combined with a position recursive control algorithm, finally To achieve the purpose of suppressing positioning force and speed pulsation, and at the same time realize the non-position sensor technology. Background technique [0002] It has been more than 140 years since the world's first subway (6km) was put into operation in London, England in 1863. According to the Japan Metro Association, at present, more than 120 cities in more than 40 countries and regions around the world have subways, with a total operating mileage of more than 7,000km. Subways have become the mainstream mode of urban rail transit vehicles. In addition, light rail, trams, suburban commuter vehicles and...

AI Technical Summary

Problems solved by technology

The literature compensates the magnetic groove positioning force of the permanent magnet synchronous motor under ideal conditions by changing the q-axis current, and has achieved some results in low-speed operation occasions. The literature proposes a method that generates additional rotation components by injecting corresponding harmonic currents. , so that it is equal to the amplitude of the fundamental wave and the higher harmonic component in the positioning force, and the phase is opposite, which can cancel each other out, so as to achieve the purpose of compensating the positioning force, but the above two methods will generate additional harmonics due to the injection of harmonic current positioning force, and the harmonic current injection process is relatively cumbersome

In recent years, extensive research has been done on suppressing repeated constant periodic thrust fluctuations in the time t domain. Since the positioning force is a non-constant periodic signal in the t domain, and the LFSPM motor often works in a non-constant speed state, it is obvious for Suppression of periodic positioning forces with a period of position is not suitable for

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