Three-level power electronic traction transformer of non-power frequency transformer

A technology without power frequency transformers and traction transformers, applied in instruments, electrical components, regulating electrical variables, etc., can solve problems such as low voltage level, reduced system reliability, control and implementation difficulties, etc. The effect of improving work efficiency and power quality

Inactive Publication Date: 2014-12-31
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, due to the withstand voltage limit of the switch tube IGBT, the voltage level of each module is low when the traction network is in n

Method used

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  • Three-level power electronic traction transformer of non-power frequency transformer
  • Three-level power electronic traction transformer of non-power frequency transformer
  • Three-level power electronic traction transformer of non-power frequency transformer

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specific Embodiment approach

[0028] image 3 It is shown that a specific embodiment of the present invention is: a three-level power electronic traction transformer without a power frequency transformer, which realizes vehicle-mounted power transformation after being connected to the traction network (V) through an input reactor L, and consists of n The same functional block (M 1 -M n ), the module is a power electronic device of an AC-DC converter with a single-phase structure, characterized in that the power electronic device is mainly composed of a single-phase diode embedded three-level rectifier circuit, a half-bridge three-level two-way straight The converter consists of:

[0029] a. The left traction network (V) is connected to one end of the input reactor (L); the other end of the input reactor (L) is connected to the module 1 (M 1 ) The left bridge arm series switch tube (S 1 , S 2 , S 3 , S 4 ) midpoint a 1 ;Module 1(M 1 ) The right bridge arm series switch tube (S 5 , S 6 , S 7 , S ...

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Abstract

The invention discloses a three-level power electronic traction transformer of a non-power frequency transformer. An input reactor L is connected with a traction network (V) to realize the vehicle-mounted power transformation, n identical function modules (M1-Mn) which are connected by input serial connection and output parallel connection are adopted, and each module is a power electronic device of an alternating current-direct current converter with a single-phase structure. The transformer is characterized in that a power electronic device consists of a single-phase diode inserting type three-level rectifying circuit and a half-bridge three-level bidirectional direct current-direct current converter. The transformer has the advantages that the structure is concise, and the requirement of the resonance is not necessary to meet ; the size of the system is greatly reduced, the working efficiency and electric energy quality are improved, the system is controllable, and the easiness in adverse effects, such as resonance, is avoided; the three-level output is realized, the current returning energy in the single switch cycle is reduced, and the energy transmission efficiency is greatly improved.

Description

technical field [0001] The invention relates to a power electronic traction transformer, in particular to a locomotive-mounted power electronic traction transformer without a power frequency transformer in the traction network. Background technique [0002] figure 1 Shown is the circuit structure of the transformer model of the traditional vehicle-mounted converter system. The figure includes AC traction network, three-winding power frequency transformer, single-phase pulse rectifier and traction inverter. The traction network is connected to the beginning of the primary winding of the three-winding power frequency transformer; the two secondary windings are respectively connected to two PWM pulse rectifiers, and the output side of the rectifier is connected in parallel and connected to the traction inverter. The traditional traction transformer traction chain is very heavy, the efficiency is relatively low, the power quality is not high, and additional harmonic compensati...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M3/335
Inventor 舒泽亮何晓琼况祖杭宋莎莎王世涛马伟天
Owner SOUTHWEST JIAOTONG UNIV
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