Power electronic transformer

Abstract

The invention provides a power electronic transformer, relates to the technical field of electrified railway traction power supply, and solves the problems of dynamically controlling negative-sequence current, compensating reactive power and electrical sectioning of a traction network. The power electronic transformer is an input cascade structure two phase-single phase power electronic transformer, which is formed by cascading n converter modules; when the power electronic transformer is cooperated with a Scott transformer, an alpha phase output A1P' is connected with a positive input end A1P of a single-phase power electronic transformer A by a linking reactor LA; a beta phase output B1P' is connected with a positive input end B1P of a single-phase power electronic transformer B by a linking reactor LB; a negative input end AnN of the transformer A is connected with a negative input end BnN of the transformer B; when a parallel output structure is used, a positive output end a1P of the transformer A is connected with the positive output end b1P of the transformer B; the negative output end anN of the transformer A is connected with the negative output end bnN of the transformer B; the negative output end anN of the single-phase power electronic transformer A is connected with a rail; and, the positive output end b1P of the transformer B is connected with a contact system by the reactor.

Description

technical field [0001] The invention relates to the technical field of electric railway traction power supply. Background technique [0002] At present, there are a large number of single-phase loads in China, especially the traction power supply system in my country. The electrified railway adopts single-phase power frequency AC system. The traction power supply system is connected to the power system through the traction substation. The core equipment of the traction substation is Traction transformer. In recent years, traction transformers with Vv wiring in direct supply mode, traction transformers with Vx wiring in AT mode, Ynvd traction transformers, Scott (Scott) traction transformers, etc. have realized three-phase-two-phase conversion, but the traction power supply system in my country There are two main problems: electricity split phase problem, negative sequence problem. The problem of electric phase separation makes the power supply line have no electricity area, ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a power electronic transformer, which can effectively solve the problems of dynamic control of negative sequence current, compensation of reactive power and phase separation of traction network

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