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Hybrid multi-level inverter for permanent magnet traction system and control method thereof

A hybrid multi-level and inverter technology, applied in the field of traction systems, can solve the problems of poor fault tolerance, large volume and weight, and low switching frequency, and achieve the effect of strong fault tolerance, high fault tolerance, and reduced quantity

Pending Publication Date: 2020-02-21
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, a hybrid multilevel inverter and its control method and high-speed rail permanent magnet traction system provided by the present invention solve the problems of low switching frequency, large volume and weight, and fault tolerance of the existing inverter. bad question

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  • Hybrid multi-level inverter for permanent magnet traction system and control method thereof
  • Hybrid multi-level inverter for permanent magnet traction system and control method thereof
  • Hybrid multi-level inverter for permanent magnet traction system and control method thereof

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Embodiment Construction

[0029] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0030] Such as figure 1 and image 3 As shown, the hybrid multilevel inverter includes at least one single-phase bridge arm 2 and a DC input circuit 1 that provides a DC voltage to the single-phase bridge arm 2; during implementation, the preferred DC side input circuit of this solution includes electrolytic capacitors coupled in series C d1 and electrolytic capacitor C d2 , electrolytic capacitor C d1 The positive term...

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Abstract

The invention discloses a hybrid multi-level inverter and a control method thereof, and a high-speed rail permanent magnet traction system. The inverter comprises at least one single-phase bridge armand a direct-current input circuit for providing a direct-current voltage for the at least one single-phase bridge arm. Each single-phase bridge arm comprises a high-voltage low-frequency unit and a low-voltage high-frequency unit which are cascaded; each high-voltage low-frequency unit comprises a two-level upper bridge arm and a two-level lower bridge arm which are coupled in series; the power switching devices in the two-level upper bridge arm and the two-level lower bridge arm are operated in a fundamental frequency mode; each low-voltage high-frequency unit comprises an intermediate connection unit and at least one T-shaped three-level unit which are sequentially cascaded, the intermediate connection unit is composed of two complementary power switching devices, and the last T-shapedthree-level unit of each low-voltage high-frequency unit is connected with an independent output; the intermediate connection unit is in cascade connection with the midpoints of the two-level upper bridge arm and the two-level lower bridge arm; and the power switching devices of the intermediate connection units and the T-shaped three-level units are operated in a high-frequency switching mode.

Description

technical field [0001] The invention relates to a traction system in a high-speed rail, in particular to a hybrid multilevel inverter, a control method thereof, and a permanent magnet traction system for a high-speed rail. 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. The traction system of high-speed trains has undergone a transformation from DC motors to AC asynchronous motor drives. Compared with induction motor drives, permanent magnet synchronous motors have low loss, high efficiency, high power density, good starting characteristics, and strong acceleration performance. With significant advantages such as low noise, it has the technical potential to gradually replace AC induction motors. [0003] The permanent magnet traction system mainly includes traction transformer, traction converter (rectifier, inverter and intermediate DC link), permane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/48H02M1/32H02P27/00H02P6/04H02P5/74H02P25/022
CPCH02M7/483H02M7/4807H02M1/32H02P27/00H02P6/04H02P5/74H02P25/022H02P2207/05H02M1/325H02M1/007
Inventor 马光同徐帅孙振耀张晗
Owner SOUTHWEST JIAOTONG UNIV
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