Direct net suspension mode for implementing homophase traction power supply based on high voltage synthetic compensating gear
A technology of comprehensive compensation and traction power supply, applied in reactive power compensation, reactive power adjustment/elimination/compensation, power lines, etc., can solve problems such as cost increase and efficiency reduction, and achieve low cost, small footprint, and low loss small effect
Inactive Publication Date: 2009-05-13
BEIJING JIAOTONG UNIV
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[0003] The technical problem to be solved by the present invention is to solve the volume, cost increase and efficiency reduction problems caused by the use of power frequency transformers in the existing traction power supply system, and to provide a direct-connection system based on a high-voltage comprehensive compensation device to realize the same-phase traction power supply. net way
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[0011] The present invention will be further described in conjunction with accompanying drawing:
[0012] The comprehensive compensation device mentioned in the present invention is the high-voltage comprehensive compensation device proposed in the patent application number 200810226792.9, titled "straight-mounted high-voltage comprehensive compensation device for traction power supply".
[0013] figure 1 It is a schematic diagram of the straight-mounted high-voltage comprehensive compensation device for traction power supply proposed in the patent application 200810226792.9. It includes 2 K-level cascaded bridge arms, 2K energy storage capacitors, and K isolated bidirectional DC converters 2; The frequency isolation transformer 5 is connected to form; the DC outlet terminals of the K rectification-side voltage converters 3 pass through the energy storage capacitor C in sequence A1 、C A2 ...C AK and the power unit A of the left K-level cascaded bridge arm 1-1 1 、A 2 ...A...
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The invention discloses a directly network-attaching method based on a high-pressure comprehensive compensation device for achieving cophase traction power supply, and relates to a traction power supply method. A leading-out terminal (x1) at a first alternating current side of a comprehensive compensation device (1) is connected into a connection point (a) of a traction network contact line (7) and a traction transformer (6) through a first alternating current reactor (11); a leading-out terminal (x2) on the second alternating current side is connected into the connection point (b) of a steel rail (8) and a transformer (6); and the leading-out terminal (x3) at the third alternating current side and a leading-out terminal (x4) at the fourth alternating current side are connected into a secondary winding (cd) on the secondary side of the traction transformer (6) through the leading-out terminal (x2) together. The invention achieves cophase supply in a compensating form, and solves the problems of volume and cost increment and efficiency reduction caused by employing an industrial frequency transformer.
Description
technical field [0001] The invention relates to a traction power supply mode, in particular to a direct grid-connection mode for realizing in-phase power supply without a traction network high-voltage comprehensive compensation device coupled with a power frequency transformer. Background technique [0002] As a large-capacity single-phase nonlinear load, when an electric locomotive is connected to a three-phase symmetrical power system through a traction transformer, a large amount of negative sequence current, harmonic current and reactive component are usually injected into it, which affects the power quality of the power supply system. China's traction power supply system is a different-phase power supply mode. The commonly used phase sequence rotation technology and the use of balancing transformer technology can only improve the influence of negative sequence current within a certain range. Due to the randomness of traction loads in space and time distribution, they Th...
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IPC IPC(8): B60M3/00B60M3/06H02J3/18
CPCY02E40/30
Inventor 郑琼林杨晓峰贺明智王琛琛林飞黄先进孙湖张立伟郝瑞祥游小杰杨中平
Owner BEIJING JIAOTONG UNIV