The Gotland HVDC Light project - experiences from trial and commercial operation

Axelsson, Urban; Holm, Anders; Liljegren, Christer; Åberg, Marcus; Eriksson, Kjell; Tollerz, Ove

doi:10.1049/cp:20010675

Cited by 61 publications

(28 citation statements)

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“…This precluded supplying DC to remote and distant locations lacking power generation, which was one reason (amongst several) for needing inverters with self-commutation capability using Turn-off Devices (ToDs) such as GTOs or transistors [4].…”

Section: Historymentioning

confidence: 99%

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On the Potential of IGCTs in HVDC

Ladoux

Serbia

Carroll³

2015

IEEE J. Emerg. Sel. Topics Power Electron.

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In today's VSC HVDC solutions, IGBTs (Insulated Gate Bipolar Transistors) are used exclusively, generally in module form where the Modular Multilevel C o n v e r t e r ( M M C ) i s c o n c e r n e d ; t h i s e n t a i l s a n u m b e r o f protective measures which increases complexity and cost. As w e m o v e t o h i g h e r t r a n s m i t t e d p o w e r s , t h e u s e o f I G C T s (Integrated Gate-Commutated Thyristors) would allow both higher voltages and currents while simultaneously reducing l o s s e s , f a i l u r e r a t e s a n d c o s t s , a s t h i s p a p e r w i l l t r y t o demonstrate by comparing current production IGCTS with both current module and press-pack IGBTs. Index Terms-HVDC transmission, Power semiconductor devices, Thermal analysis, AC-DC power converters, MMC2168-6777 (c)

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Section: Historymentioning

confidence: 99%

“…N e v e rthe le s s , a 5 0M W inverter was put into service in 1999 by ABB, supplying power from mainland Sweden to the island of Gotland [4]. Thus 1999 heralded the advent of VSCs in HVDC although classic LCCs have continued to dominate the market for their raw power transmission capabilities (of up to 3GW).…”

Section: Historymentioning

confidence: 99%

On the Potential of IGCTs in HVDC

Ladoux

Serbia

Carroll³

2015

IEEE J. Emerg. Sel. Topics Power Electron.

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“…Particularly, VSC appears as a suitable technology for multi-terminal dc (MTDC) systems/grids [6]. The developments of VSC-based MTDC can be found in [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Unified reference controller for flexible primary control and inertia sharing in multi‐terminal voltage source converter‐HVDC grids

Rouzbehi

Zhang

Candela

et al. 2017

IET Generation, Transmission & Distribution

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Multi-terminal dc (MTDC) grids are expected to be built and experience rapid expansion in the near future as they have emerged as a competitive solution for transmitting offshore wind generation and overlaying their ac counterpart. The concept of inertia sharing for the control and operation of MTDC grids, which can be achieved by the proposed unified reference controller. The control objectives of the MTDC grids voltage source converter (VSC) stations are no longer limited to the stabilisation of MTDC grid, instead, the requirements of ac side are also met. The interaction dynamics between the ac and dc grid is analysed to illustrate the proposed concept. In addition, the voltage source converter stations can work in different operation modes based on the proposed unified control structure, and can switch among the operation modes smoothly following the secondary control commands. Simulation results exhibit the merits and satisfactory performance of the proposed control strategy for stable MTDC grid operation.

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“…HE initial form for Voltage Source Conversion based High Voltage Direct Current power transmission (VSC HVDC) was based on the six pulse bridge in which the converter valves are composed of long strings of series connected IGBT devices [1], [2] and [3]. This method was very successful in achieving a commercial HVDC system but because of the need to repeatedly switch all the devices in a valve, in addition to the need for passive components to ensure voltage sharing between the series connected devices, the system had high losses compared to conventional thyristor based HVDC schemes and also required significant screening and filtering to eliminate both airborne and conducted radio frequency interference.…”

Section: Introductionmentioning

confidence: 99%

Modular Multilevel Converter Design for VSC HVDC Applications

Oates¹

2015

IEEE J. Emerg. Sel. Topics Power Electron.

117

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The Modular Multilevel Converter (MMC), originally proposed by Professor Marquardt, has made it practical to realise converters with ratings up to 1000MW using standard components developed for variable speed drives. With the power electronics packed into individual "sub-modules", the ability to realise a converter where the AC and DC voltages are under direct control and have very little distortion appears to be an ideal; however, while there have been several papers published covering the design considerations required to ensure these converters operate correctly from an academic perspective, the method of specifying the design of a fully rated MMC, where several hundred sub-modules may be required for each valve to meet all conditions in service have not been discussed. The paper outlines a procedure for calculating the values of the transformer turns ratio, the transformer reactance and the valve reactance before considering how the ripple that appears on the submodule voltage affects the operating performance of the converter. This ripple limits the sub-modules from being able to fully utilise their capability so the principal operators that affect the ripple voltage are considered. The main independent variables available are the sub-module capacitor value, the number of sub-modules per valve and the average capacitor voltage setting, which is set as a servo demand within the control. All these inputs have an effect on all aspects of the converter performance and so must be set together while considering other system variables such as the variation in the AC voltage.

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The Gotland HVDC Light project - experiences from trial and commercial operation

Cited by 61 publications

References 0 publications

On the Potential of IGCTs in HVDC

On the Potential of IGCTs in HVDC

Unified reference controller for flexible primary control and inertia sharing in multi‐terminal voltage source converter‐HVDC grids

Modular Multilevel Converter Design for VSC HVDC Applications

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