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Power transmission system for improving transmission capability of alternating-current circuit through using voltage source current converting technology

A voltage source converter, using voltage technology, applied in the field of power transmission system, can solve the problems of difficulty in new lines, load growth in large cities, etc., and achieve the effect of increasing the flexibility and reliability of system operation

Active Publication Date: 2013-11-13
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a power transmission system that adopts the voltage source commutation technology to improve the transmission capacity of the AC line. It solves the problems of wire utilization and reactive power compensation when AC lines are transformed into DC lines, and is of great significance to solve the contradiction between the increasing load in large cities and the increasingly difficult new lines

Method used

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  • Power transmission system for improving transmission capability of alternating-current circuit through using voltage source current converting technology
  • Power transmission system for improving transmission capability of alternating-current circuit through using voltage source current converting technology
  • Power transmission system for improving transmission capability of alternating-current circuit through using voltage source current converting technology

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Embodiment 1

[0039] The present invention adopts the voltage source commutation technology to improve the topology of the power transmission system of the three-phase AC line transmission capacity:

[0040] The topological structure of the power transmission system that uses the voltage source commutation technology to improve the transmission capacity of the three-phase AC line provided by the present invention is as follows: figure 1 As shown, the structure includes three transmission lines L1, L2, L3, two switching devices, six voltage source converters VSC1, VSC1', VSC2, VSC2', VSC3 and VSC3', and the DC of the voltage source converter Clamp capacitors C1, C1', C2, C2', C3, and C3', and AC system 1, AC system 2.

[0041] The two ends of the wire L1 are connected to the positive poles of the DC clamp capacitors C1 and C1', the two ends of the wire L2 are connected to the negative poles of the DC clamp capacitors C2 and C2', and the two ends of the wire L3 are connected to the switching ...

Embodiment 2

[0047] The present invention adopts the voltage source commutation technology to improve the working principle of the power transmission system of the three-phase AC line transmission capacity:

[0048] The schematic diagram of the working principle of the power transmission system that adopts the voltage source commutation technology to improve the transmission capacity of the three-phase AC line provided by the present invention is as follows Figure 4 shown. By periodically changing the magnitude of the three pole currents, the transmission power of the DC system can be increased under the same heating limit. By periodically changing the polarity of the voltage and current of the third pole, the periodic sharing of the current of the first pole and the second pole is realized. The magnitude of the current in the first pole and the second pole changes periodically between Imax and Imin, but the direction does not change; the magnitude of the current in the third pole does n...

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Abstract

The invention relates to the field of a power electronic technology and particularly relates to a power transmission system for improving the transmission capability of an alternating-current circuit through using a voltage source current converting technology. The power transmission system uses three lead wires, and voltage source converters at both ends of each lead wire so as to form a tri-polar wiring manner. According to the power transmission system provided by the invention, the problems of lead wire use ratio, passive compensation and the like caused by that the alternating-current circuit is improved to a direct-current circuit, can be well solved by using bidirectional conduction capability of the voltage source converters and matching with a switch converting device, so that the power transmission system has important meanings on overcoming the paradox that the load of large-size cities is continuously increased and the difficulty of newly building circuits is increased.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a power transmission system that adopts voltage source commutation technology to improve the transmission capacity of an AC line. Background technique [0002] The continuous increase of urban electricity load requires the continuous development of grid scale and transmission capacity. However, new transmission corridors face more and more economic and environmental constraints, especially in large urban center areas. The addition of traditional overhead transmission lines does not meet the requirements of urban planning. , New underground cables are also subject to various restrictions. Since the insulation of the AC system is designed according to the peak voltage, and the transmission capacity is determined by the effective value of the voltage, and the capacitive current will occupy the entire effective load capacity of the cable core wire in the long-distance AC ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/18
CPCY02E60/60Y02E40/30
Inventor 郭剑波荆平周飞宋洁莹
Owner STATE GRID CORP OF CHINA
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