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DC voltage compensation in a multi-terminal hvdc power transmission network

A power transmission and network technology, applied in the field of active voltage source devices, can solve problems such as high cost

Active Publication Date: 2012-03-14
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] HVDC (High Voltage Direct Current) power transmission is generally used when there is a need to transmit power over long distances, since the higher cost of HVDC equipment at long distances is compensated by the reduced losses compared to AC power transmission

Method used

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  • DC voltage compensation in a multi-terminal hvdc power transmission network
  • DC voltage compensation in a multi-terminal hvdc power transmission network
  • DC voltage compensation in a multi-terminal hvdc power transmission network

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Embodiment Construction

[0031] figure 1 A multi-terminal HVDC power transmission network 10 is shown in the form of a non-mesh network and in particular in the form of linear interconnections. Assume that initially there are three double-ended HVDC links and these three double-ended HVDC links are operated independently of each other, wherein the first HVDC link comprises a converter station 1 and a converter station 2. The second HVDC link includes converter station 3 and inverter station 4 interconnected by transmission line 20 , while the third HVDC link includes inverter station 5 and inverter station 5 interconnected by transmission line 18 Station 6. Afterwards, the first HVDC link and the second HVDC link are connected by introducing a transmission line 14 between the converter station 2 and the converter station 3, while between the converter station 4 and the converter station 5 A transmission line 16 is introduced between the second HVDC link and the third HVDC link. The result obtained ...

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Abstract

In a multi-terminal HVDC power transmission network (10) comprising at least three HVDC converter stations (1 to 6) interconnected by at least two transmission lines (12, 14, 16, 18, 20), where at least one of the transmission lines is a long line, an active voltage source device (30) is series connected to one of the transmission lines (20), which maintains the DC voltage of the transmission lines of the network to be within a predefined voltage range by injecting an additional DC voltage in series with the one transmission line (20).

Description

technical field [0001] The invention relates to a multi-terminal HVDC power transmission network comprising at least three HVDC converter stations interconnected by at least two transmission lines, wherein at least one of the transmission lines is a long line. The invention also relates to a method of operating such a network and to an active voltage supply arrangement. Background technique [0002] HVDC (High Voltage Direct Current) power transmission is often used when there is a need to transmit power over long distances, since the higher cost of HVDC equipment is compensated at long distances by the reduced losses compared to AC power transmission. Long-distance or long-distance lines are understood below to mean distances of approximately 500 km or more. [0003] In the prior art, mainly known are point-to-point HVDC links or double-ended HVDC links, ie HVDC transmission systems comprising two power converter stations, one at each end of the power transmission line. f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60H02J1/10
Inventor 拉尔斯-埃里克·尤林
Owner HITACHI ENERGY SWITZERLAND AG
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