HVDC converter system and control method therefor and HVDC system using the same

A converter and controller technology applied in the field of HVDC systems

Active Publication Date: 2019-01-04
HITACHI ENERGY SWITZERLAND AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • HVDC converter system and control method therefor and HVDC system using the same
  • HVDC converter system and control method therefor and HVDC system using the same
  • HVDC converter system and control method therefor and HVDC system using the same

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Embodiment Construction

[0024] While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will be described herein in detail. It should be understood, however, that the drawings and detailed description thereto are not intended to limit the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention , as defined in the appended claims. Note that headings are used for organizational purposes only and are not meant to limit or interpret the specification or claims. Also, please note that in this application, the word "may" is used in a permissive sense (ie, has the meaning of being able to), rather than a mandatory sense (ie, must). The term "comprising" and its derivatives mean "including but not limited to". The term "connected" means "connected directly or indirectly"...

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Abstract

It provides an HVDC converter system, a method therefor and an HVDC system using the same. The HVDC converter system includes a plurality of VSCs (110,111,120,121) being coupled at their DC sides in series, wherein two terminals of the series connection are configured to be coupled with HVDC network; a plurality of by-pass breakers (112,113,122,123), each being in parallel coupled with the DC sideof the corresponding one of the plurality of VSCs (110,111,120,121) and being closed where its corresponding VSC is blocked; and a controller (15), being adapted to control current following throughthe closed by-pass breaker to reach zero and subsequently control the closed by-pass breaker to open. By controlling the by-pass breaker associated with the VSC to be taken in to reach zero current inthe first place and then opening the by-pass breaker and deblocking the VSC, the by-pass breaker can be opened in a reliable way independent of zero-crossing of the by-pass breaker naturally would have generated, otherwise, by using converter system built up of LCCs. Therefore, a blocked VSC of converter system of a converter station for HVDC transmission system can be reliably taken into operation, while the other VSC is still operating.

Description

technical field [0001] The present invention relates to HVDC systems, and more particularly to HVDC converters arranged for operation in series, eg for voltage doubling. Background technique [0002] A high voltage direct current (HVDC) transmission system comprises converter stations at each end of the HVDC network for connecting said network to an alternating current (AC) system, each said station comprising a series connection of at least two converters, so The direct current (DC) side of the converter is connected on the one hand to the poles of the network at high potential and on the other hand to the neutral bus at zero potential via ground, the first of the converter stations adapted to operate as a rectifier and the other (the second) as an inverter, each converter having a bypass breaker forming a bypass for said converter when said breaker is closed connected in parallel in the current path of the circuit, each converter station comprising means adapted to contro...

Claims

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Application Information

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IPC IPC(8): H02M7/757
CPCH02M7/7575H02J3/36H02M7/757Y02E60/60
Inventor 马茨·安德森苑春明张利东杨晓波
Owner HITACHI ENERGY SWITZERLAND AG
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