A three-arm compensation device for reactive power and asymmetry compensation of electrified railway
A technology for electrified railways and compensation devices, applied in reactive power compensation, output power conversion devices, reactive power adjustment/elimination/compensation, etc. Cost-effective, flexible effects
Inactive Publication Date: 2016-03-30
北京思源清能电气电子有限公司
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a compensation device for reactive power and asymmetry compensation of electrified railways, which solves the problem that the current compensation device occupies a large area, has a large loss, and needs to be loaded with a single-phase transformer to connect to the power grid. high cost defect
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[0025] Below in conjunction with specific embodiment, further illustrate the present invention.
[0026] The present invention aims at the above-mentioned deficiencies in the prior art, and proposes a new technical solution on the basis of the above-mentioned patents, and connects the dynamic compensation device of the three-arm structure to the side of the 27.5kV traction grid, and applies it to the electric railway The reactive power and negative sequence compensation of the system has one less bridge arm than the four bridge arm structure of the above patent. The three bridge arms have a common DC bus, which can output a variety of compensation currents. In addition to reactive currents, they can also directly output negative sequence currents and harmonic currents, thus having higher cost performance. This scheme can be adapted to various traction transformers, and is connected to the power supply arm through a reactor or a transformer, so the application is more flexible....
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The invention relates to a power electronic compensation device for an electrified railway and belongs to the field of electrified railway power supply. The compensation device for reactive power and non-symmetrical compensation for the electrified railway is characterized in that the device comprises three inverter bridge arms sharing a DC bus and a device detection and control unit, wherein the AC outgoing lines of the three inverter bridge arms are connected to an electric traction system through a connection reactor or a connection transformer; the AC outgoing line of the first bridge arm is connected onto the leading phase of the electric traction system; the AC outgoing line of the second bridge arm is connected onto the lagging phase of the electric traction system; the AC outgoing line of the third bridge arm is connected onto the return cable of the electric traction system; the device detection and control unit is used for collecting and analyzing all signals, and calculating and controlling a device to output compensating current. According to the invention, the dynamic compensation structure of three bridge arms is adopted and the three bridge arms share the same DC bus, so that various compensating currents can be output, and besides reactive current, negative sequence current and harmonic current can also be output directly.
Description
technical field [0001] The invention relates to a power electronic compensation device for electrified railways, which can be used for reactive power and asymmetric compensation of electrified railway loads, and can control low harmonics at the same time. A three-arm compensation device for reactive power and asymmetry compensation of electrified railways. Background technique [0002] With the rapid development of the national economy, the electrified railway has developed rapidly, which brings people fast and efficient transportation, but also brings serious power quality problems. Locomotives are single-phase power supply loads, and electrified railway traction substations often use three-phase-two-phase transformers, including VV transformers, VX transformers, Ynd11 transformers, SCOTT transformers, etc. The primary side is a three-phase 110kV / 220kV system, and the secondary side is Two single phase 27.5kV systems. Different traction transformers have different relatio...
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IPC IPC(8): H02J3/18H02M7/483
CPCY02E40/30
Inventor 陈晋辉张秀娟刘定坤
Owner 北京思源清能电气电子有限公司