Application of HVDC Light to power system enhancement

Asplund, Gunnar

doi:10.1109/pesw.2000.847202

Cited by 129 publications

(47 citation statements)

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“…On the other hand, the VSC-HVDC does not need to reverse direct voltage polarity to change the power flow direction, which enables it as a promising solution for constructing MTDC systems. VSC-HVDC technology can also address other conventional grid issues, such as bulk power transmission, asynchronous grid interconnections, back-to-back AC system linking, and voltage/ frequency support [20][21][22] and it is also suited to facilitate the large-scale integration of renewable energy sources into the grid [23]. With this dawn of VSC-HVDC technology, the dream of implementing large-scale integrated MTDC systems/grids can become a reality in a near future.…”

Section: High-voltage and Mtdc-the State Of Playmentioning

confidence: 99%

Multi-terminal DC grids: challenges and prospects

Rodríguez

Rouzbehi

2017

J. Mod. Power Syst. Clean Energy

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A few multi-terminal direct current (MTDC) systems are in operation around the world today. However, MTDC grids overlaying their AC counterpart might a reality in a near future. The main drivers for constructing such direct current grids are the large-scale integration of remote renewable energy resources into the existing alternative current (AC) grids, and the promotion and development of international energy markets through the socalled supergrids. This paper presents the most critical challenges and prospects for such emerging MTDC grids, along with a foreseeable technology development roadmap, with a particular focus on crucial control and operational issues that are associated with MTDC systems and grids.

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Section: High-voltage and Mtdc-the State Of Playmentioning

confidence: 99%

Multi-terminal DC grids: challenges and prospects

Rodríguez

Rouzbehi

2017

J. Mod. Power Syst. Clean Energy

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“…With strong controllability and high reliability, the VSC-based high voltage direct current (VSC-HVDC) technology has broad application prospects in the integration of large-scale renewable sources, interconnection of AC networks, power supply of islands, long-distance power transmission and so on [3,4]. Interconnection of high voltage networks via a VSC-HVDC interconnector can realize power supply among different AC networks without increasing short-circuit currents, which is helpful to make full use of the power supply capacity of each network and enhance the reliability of power systems.…”

Section: Introductionmentioning

confidence: 99%

The Applicability of Traditional Protection Methods to Lines Emanating from VSC-HVDC Interconnectors and a Novel Protection Principle

et al. 2016

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Abstract:Voltage source converter (VSC)-based high voltage direct current (VSC-HVDC) interconnectors can realize accurate and fast control of power transmission among AC networks, and provide emergency power support for AC networks. VSC-HVDC interconnectors bring exclusive fault characteristics to AC networks, thus influencing the performance of traditional protections. Since fault characteristics are related to the control schemes of interconnectors, a fault ride-through (FRT) strategy which is applicable to the interconnector operating characteristic of working in four quadrants and capable of eliminating negative-sequence currents under unbalanced fault conditions is proposed first. Then, the additional terms of measured impedances of distance relays caused by fault resistances are derived using a symmetrical component method. Theoretical analysis shows the output currents of interconnectors are controllable after faults, which may cause malfunctions in distance protections installed on lines emanating from interconnectors under the effect of fault resistances. Pilot protection is also inapplicable to lines emanating from interconnectors. Furthermore, a novel pilot protection principle based on the ratio between phase currents and the ratio between negative-sequence currents flowing through both sides is proposed for lines emanating from the interconnectors whose control scheme aims at eliminating negative-sequence currents. The validity of theoretical analysis and the protection principle is verified by PSCAD/EMTDC simulations.

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“…Among them the Alternate Arm Converter (AAC) [4] which involves the combination of the MMC concept [6] with the 2-level converter concept [12]. If the MMC and the AAC are based on a parallel connection of phases on the DC side, another family of converters can be developed based on a series connection configuration on the DC side [3,13].…”

Section: Introductionmentioning

confidence: 99%

The series bridge converter (SBC): Design of a compact modular multilevel converter for grid applications

Amankwah¹,

Costabeber²,

Watson³

et al. 2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

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Access from the University of Nottingham repository:http://eprints.nottingham.ac.uk/37544/1/The%20Series%20Bridge%20Converter%20SBC %20Design%20of%20a%20Compact%20Modular%20Multilevel%20Converter%20for %20Grid%20Applications.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the University of Nottingham End User licence and may be reused according to the conditions of the licence. For more details see: http://eprints.nottingham.ac.uk/end_user_agreement.pdf A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Abstract-This paper presents a novel hybrid modular multilevel voltage source converter suitable for grid applications. The proposed converter retains the advantages of other modular multilevel topologies and can be made more compact making it attractive for offshore stations and other footprint critical applications like city infeeds. In this paper, the basic operating principle and design criteria for the converter implementation are presented. The submodule capacitor requirements which have significant influence on the size of a converter station are also evaluated and compared to the MMC.The performance of the converter is supported by simulation results from a representative medium voltage scaled demonstrator.

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Application of HVDC Light to power system enhancement

Cited by 129 publications

References 0 publications

Multi-terminal DC grids: challenges and prospects

Multi-terminal DC grids: challenges and prospects

The Applicability of Traditional Protection Methods to Lines Emanating from VSC-HVDC Interconnectors and a Novel Protection Principle

The series bridge converter (SBC): Design of a compact modular multilevel converter for grid applications

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