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

A technology for power transmission systems and AC lines, applied in the field of power transmission systems, can solve problems such as load growth in large cities and difficulties in building new lines, and achieve the effects of reducing demand, increasing economy, and reducing costs

Active Publication Date: 2012-10-17
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of power transmission system uses the current bidirectional conduction capacity of the voltage source converter and the bidirectional thyristor converter, and cooperates with the switch switching device to solve the problems of wire utilization and reactive power compensation when the AC line is transformed into a DC line. It is of great significance to solve the contradiction between the increasing load of large cities and the increasingly difficult construction of new lines

Method used

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

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Embodiment 1

[0054] The structural scheme of the power transmission system that adopts the hybrid commutation technology to improve the transmission capacity of the AC line provided by the present invention is as follows: figure 2 As shown, the transmission system includes three transmission lines L1, L2, L3, two switching devices, four current source converters CSC1, CSC1', CSC2, CSC2', two voltage source converters VSC3, VSC3 ', the DC clamping capacitors C3 and C3' of the voltage source converter, and the AC system 1 and AC system 2.

[0055] The two ends of the wire L1 are connected to the positive poles of CSC1 and CSC1', the two ends of the wire L2 are connected to the negative poles of CSC2 and CSC2', the two ends of the wire L3 are connected to the switching device, and then connected to the positive poles of the DC clamping capacitors C3 and C3' or connected to the negative pole. The common ground point is connected to the negative poles of CSC1 and CSC1', and the positive poles...

Embodiment 2

[0061] The structure scheme 2 of the power transmission system that adopts the hybrid commutation technology to improve the transmission capacity of the AC line provided by the present invention is as follows: Figure 5 As shown, the transmission system includes three transmission lines L1, L2, L3, four voltage source converters VSC1, VSC1', VSC2, VSC2', DC clamping capacitors C1, C1', C2 of the voltage source converter , C2', two current source converters CSC3 and CSC3' such as bidirectional thyristor switches, and AC system 1 and AC system 2.

[0062] Both ends of the wire L1 are connected to the positive poles of the DC clamping capacitors C1 and C1', both ends of the wire L2 are connected to the negative poles of the DC clamping capacitors C2 and C2', and both ends of the wire L3 are connected to the CSC3 and CSC3'. The common ground point is connected to the negative poles of C1 and C1', the positive poles of C2 and C2', and the ground poles of CSC3 and CSC3'.

[0063] T...

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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 mixed current converting technology. The power transmission system adopts a tri-polar wiring manner; each-polar wiring comprises a lead wire and converters respectively connected with both ends of the lead wire; and each converter comprises a voltage source converter and a current source converter. The invention designs the mixed power transmission system with sensitivity and economical efficiency by combining the advantages of strong controllability of a voltage source converter, high capacity of the current source converter and low cost. 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 converter and a bidirectional transistor converter, 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 present invention relates to the technical field of power electronics, and in particular to a power transmission system that adopts hybrid commutation technology to improve the transmission capacity of AC lines. Background technique [0002] Newly added transmission corridors are facing more and more economic and environmental restrictions, especially in the central areas of large cities. The addition of traditional overhead transmission lines does not meet the requirements of urban planning. At the same time, new underground cables are also subject to various restrictions. Converting the AC line to DC operation can not only eliminate the limitation of the AC system on the power flow, but also increase the transmission capacity. Facing the increasingly difficult contradictions of new transmission corridors and increasing load levels, the conversion of existing AC lines to DC operation can improve the power transmission capacity while eliminating th...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 荆平郭剑波周飞宋洁莹
Owner STATE GRID CORP OF CHINA
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