A cascaded through-type in-phase power supply system without input and output transformers

An output transformer, in-phase power supply technology, applied in power lines, transportation and packaging, vehicle components, etc., can solve the problems of limited power supply capacity, reactive power and harmonics, low reliability, etc., to reduce construction costs and maintenance costs, The effect of reducing floor space and reducing operating costs
CN104786872BActive Publication Date: 2017-01-25成都拓及兴通科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
成都拓及兴通科技有限公司
Publication Date
2017-01-25

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Abstract

The invention discloses a cut-through type cophase power supply system for cascaded input-free and output-free transformers. The system is mainly composed of a power electronics conversion device with three phases connected in parallel after each being cascaded with one or more AC-DC-AC converters of single phase-single phase structures. The three phases of the cascaded power electronics conversion device are directly connected with a traction contact net after being connected in parallel. The single phase-single phase AC-DC-AC converters can bear high voltage levels through the multi-module cascaded structure; meanwhile, the voltage levels output by converters are improved; thus, input and output transformers can be omitted, power required for locomotive loads is borne by the three phases on average, and energy can flow in two directions. Due to the fact that amplitude values, phases and frequencies of the output voltage can be controlled, contact nets close to substations can be directly connected to form a cut-through traction power supply network. By means of the cut-through type cophase power supply system, the input and output transformers of the traction substations can be omitted, the defects that the transformers in the traction substations are large in size, heavy in weight, troublesome to overhaul and high in manufacturing cost are overcome, the capacity of the traction substations is easily improved, and the running cost of the substations is reduced.
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Description

technical field

[0001] The invention relates to a cascaded three-phase-single-phase converter device, especially its application in a through-type in-phase power supply system without excessive phase intervals. Background technique

[0002] At present, electrified railways in many countries in the world basically adopt a three-phase-two-phase (out-of-phase) power supply mode, and its structure is as follows figure 1 shown. The substation takes power from the three-phase power grid through the traction transformer and then divides it into two power supply arms to output power for the traction network. Since the voltage phase, amplitude and frequency of the power supply arms are difficult to be completely consistent, electric phase splitting must be set between the power supply arms. With the development of high-speed and heavy-haul railways, the following problems will become more prominent:

[0003] (1) Power quality problem: The single-phase load of the existing out-of-p...

Claims

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