A multi-topology conversion inverter and a control method thereof

Through the design and control methods of multi-topology inverters, flexible topology switching of the inverter under different operating conditions is realized, which solves the downtime problem of existing three-phase inverters when switching devices fail, improves operational reliability and harmonic characteristics, and reduces spare parts inventory.

CN116317505BActive Publication Date: 2026-06-26CRRC YONGJI ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
CRRC YONGJI ELECTRIC CO LTD
Filing Date
2022-12-06
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

The existing topology of three-phase inverters cannot be changed according to actual conditions or operating conditions, resulting in shutdown when switching devices fail, affecting the reliability and operating efficiency of locomotives, and failing to achieve good harmonic characteristics with limited cooling capacity.

Method used

The inverter design employs multi-topology transformation, including a DC support module, an AC conversion module, a circuit conversion device, a pre-charge device, and a controller. Through pulse conversion and control of the circuit conversion module, the inverter's main circuit topology can be flexibly transformed. Combined with different control algorithms (such as two-level, NPC, and ANPC), it can adapt to different operating conditions, achieving redundant design and modular optimization.

Benefits of technology

It improves the flexibility and reliability of the inverter, reduces the number of modules, lowers the inventory of spare parts, ensures normal operation even when switching devices fail, and improves the reliability and harmonic characteristics of the system.

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Abstract

The present application belongs to the field of rail transit conversion technology application, and particularly relates to a novel multi-topology conversion inverter and a control method thereof. The present application solves the technical problem that the basic main circuit topology structure of the three-phase inverter is determined in the design, and cannot be changed according to the actual situation or working condition. When a switching device in the power module is damaged, the three-phase inverter has to be stopped, resulting in power loss, and having a great influence on the reliability and operation efficiency of the locomotive. The present application optimizes the design of the three-phase inverter main topology, adopts modular design, reduces the types of power modules, reduces the inventory of spare parts, and the main topology structure of the three-phase inverter can be flexibly changed according to the demand. When a switching device is damaged, the normal operation of the three-phase inverter can still be realized through topology switching. The present application is redundantly designed for different application environments and application requirements, and improves the reliability and operation efficiency of the three-phase inverter.
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