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Communicationless control of a converter station

A converter station and current technology, applied in the field of converter stations, can solve the problems of increased cost and overall complexity of the HVDC transmission system, and achieve the effects of eliminating demand, reducing cost, and reducing demand

Active Publication Date: 2020-08-21
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this can lead to increased cost and overall complexity of the HVDC transmission system, there is a need for both improved converter stations and improved methods of operating converter stations

Method used

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  • Communicationless control of a converter station
  • Communicationless control of a converter station
  • Communicationless control of a converter station

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0037] refer to figure 1 , the HVDC transmission system is described next.

[0038] figure 1 An HVDC transmission system 100 is illustrated. The HVDC transmission system 100 includes a DC transmission link 110 having a first end 112 and a second end 114 . The first converter station 120 is connected to the DC transmission link 110 at the first end 112 and the second converter station 130 is connected to the DC transmission link 110 at the second end 114 . The DC transmission link 110 may eg comprise one or more DC (transmission) lines in which DC current may flow.

[0039] The first converter station 120 comprises a HVDC converter 122 connected to an AC grid 140 via a transformer 124 . The transformer 124 may be part of the first converter station 120 . It is contemplated that the first converter station 120 may contain more than one HVDC converter 122 and it is also contemplated that there may be more than one transformer 124 in order to connect the first converter stati...

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PUM

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Abstract

A method is provided for operating a converter station (120) in a HVDC transmission system including a DC transmission link (110) having a first end (112) at which the converter station (120) is connected and a second end (114) at which a second converter station (130) is connected. The method may include sensing, at the first end of the DC transmission link, a DC current and a DC voltage of the DC transmission link; determining, based on the sensed DC current and the sensed DC voltage, whether a phase-to-ground fault has occurred at the second converter station (130), and reducing, on the basis (152) that it is determined that the phase-to-ground fault has occurred, a power delivered by the converter station (120) to the second converter station (130) via the DC transmission link (110). Aconverter station and a HVDC transmission system are also provided.

Description

technical field [0001] The present disclosure relates to a method of operating a converter station in a high voltage direct current (HVDC) transmission system. More generally, the present disclosure relates to a method of operating a direct current (DC) converter station during an at least phase-to-ground fault at a second HVDC converter station connected to the HVDC converter station via such a transmission link. Background technique [0002] In HVDC transmission systems, it may be advantageous to use one or more voltage source converters (VSCs) at the inverting (ie receiving) end of the DC transmission link. Such advantages may eg include greater freedom in control, the ability to avoid commutation failures, and / or enhanced possibilities for connection to eg passive alternating current (AC) loads. [0003] However, during a phase-to-ground fault at the AC terminals of the VSC, the VSC may experience high overvoltage stress. In order to avoid such overvoltage stresses cau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12G01R31/52H02M1/32H02H7/125
CPCH02M1/32H02H7/1213H02H7/1257G01R31/52H02M7/4835H02J3/36H02H9/02
Inventor S·罗伊-乔杜里英·江-赫夫纳G-K·卡萨尔M·穆罕默迪马茨·安德森
Owner HITACHI ENERGY SWITZERLAND AG
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