Neutral device, converter station and DC power transmission system

A technology for power transmission and converter stations, which is applied in the direction of power transmission AC network, circuit device, AC power input conversion to AC power output, etc. It can solve the problems of potential risk of fault handling failure due to increased insulation level, etc., to allow fault handling, To avoid the effect of voltage stress increases

Active Publication Date: 2021-07-16
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Additionally, an increase in insulation levels could significantly increase fault handling, given that the neutral line voltage under normal operation may be close to zero or below 10kV in the worst case of unipolar operation, but may rise above 500kV during transients potential risk of failure

Method used

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  • Neutral device, converter station and DC power transmission system
  • Neutral device, converter station and DC power transmission system
  • Neutral device, converter station and DC power transmission system

Examples

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Embodiment Construction

[0030] The invention relates to a converter station for a direct current (DC) power transmission system and a neutral device in such a converter station.

[0031] exist figure 1 A DC power transmission system in which an inverter with a neutral device may be provided is schematically shown in .

[0032] In one example, the converter system is a bipolar modular multilevel converter (MMC) based multi-terminal high voltage direct current (HVDC) system with multiple direct current (DC) power sources becoming a true meshed DC grid circuit.

[0033] In FIG. 1, the first converter 10 of the first sending station SS1 via the first pole P1 3 connected to the first converter 14 of the regulating station AS, and the second converter 12 of the first sending station SS1 via the second pole P2 3 connected to the second converter 16 of the adjusting station AS, wherein the neutral line NL3 connects the junction between the first and second converters 10 and 12 of the first sending station...

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PUM

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Abstract

The invention relates to a neutral arrangement (NA) for a converter station (RS) of a DC power transmission system, such a converter station and such a system, the converter station comprising a first converter (22). Neutral device (NA) including surge arrester (SA NB1 、SA NB2 、SA NB3 、SA NB4 、SA NB5 、SA NB6 、SA NL1 、SA NL2 、SA NLn ) and a set of neutral buses, wherein each surge arrester is connected between a neutral bus (NB1, NB2, CNB) of the set of neutral buses and ground, wherein the first insulation of the neutral device The zone is a high-voltage isolated zoom zone (NZOOMH) containing the first set (SAA) of surge arresters, and the second isolated zone of the neutral device is a low-voltage isolated zoom zone containing the second set (SAB) of surge arresters ( NZOOML), where the surge arresters (SA) in the first group (SAA) NB1 、SA NB2 , SA NB4 、SA NB5 ) has more than the surge arrester (SA) in the second group (SAB) NB3 、SA NB6 , SA NL1 、SA NL2 、SA NLn ) Higher arrester reference voltage.

Description

technical field [0001] The present invention generally relates to high voltage equipment. More specifically, the invention relates to a neutral device, a converter station and a DC power transmission system including such a neutral device. Background technique [0002] In some cases, attention has been paid to multi-terminal high-voltage direct current (HVDC) systems using bipolar modular multilevel converters (MMCs) with several direct current (DC) power circuits becoming truly meshed DC grids . [0003] An exemplary system is a 4 terminal system or grid comprising 2 sending stations, 1 receiving station and 1 regulating station. Therefore, unlike other existing multi-terminal HVDCs, the system described above is based on a bipolar MMC converter configuration and will form multiple DC power loops that become a true mesh DC grid. Therefore, the above-mentioned system has historical significance for the future DC grid and will also face new challenges. [0004] In a bipol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H9/04H02J3/36
CPCH02H7/268H02H9/042H02J3/36Y02E60/60H02J3/001H02H9/04H02M5/4585
Inventor 英·江-赫夫纳
Owner HITACHI ENERGY SWITZERLAND AG
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