Comparison of HVDC Light (VSC) and HVDC Classic (LCC) Site Aspects, for a 500MW 400kV HVDC Transmission Scheme

Sellick, R L; Åkerberg, M

doi:10.1049/cp.2012.1945

Cited by 81 publications

(53 citation statements)

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“…The low harmonic content of currents and voltages in the VSC HVDC systems allow these filters to be small and simple [34].  Back-to-back HVDC systems [17,33]  Bipolar HVDC systems (bipole, bipole with metallic return, bipole with series-connected converters) [17,33,55]  Multi-terminal HVDC systems [17,33,55] Figure 3: HVDC system topologies…”

Section: Capacitors and Filtersmentioning

confidence: 99%

Review of VSC HVDC connection for offshore wind power integration

Korompili

Zhao

2016

Renewable and Sustainable Energy Reviews

128

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Voltage Source Converter (VSC) High Voltage Direct Current (HVDC) connection has become a new trend for long distance offshore wind power transmission. It has been confirmed by a lot of research that the maximum distance of a High Voltage Alternative Current (HVAC) sub-marine cable transmission system is limited due to surplus charging current of the cables. The VSC HVDC transmission system has the ability to overcome the limitation and offers other advantages over the HVAC transmission system. This paper is to review the VSC HVDC transmission technology and its application for offshore wind power integration. Firstly, the main components, configuration and topology of the VSC HVDC transmission system are described.Secondly, the converter control system and control strategies are presented. Following that, the capabilities of the VSC HVDC technology are described. Finally, the focus is given on the control methods of the VSC HVDC transmission system for fulfilling grid code requirements concerning Low Voltage Ride-Through (LVRT) and frequency regulation.

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Section: Capacitors and Filtersmentioning

confidence: 99%

Review of VSC HVDC connection for offshore wind power integration

Korompili

Zhao

2016

Renewable and Sustainable Energy Reviews

128

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“…Figure 5 displays the simulation results when the UHVDC link in Figure 4 is initially operated as a symmetrical triple pole, with ground transfer breakers GSB 1 and GSB 2 open, when each Station 1 MMC is commanded to exchange 360MW with G 1 (total of 3360MW), while they autonomously participating in ac voltage regulation at PCC 1 . At time t=1s, a permanent pole-to-ground dc fault is applied at point 'F' and is cleared after 20ms having opened dc circuit breakers CB 11 and CB 12 . MMC 11 and MMC 21 which are connected to the faulty pole are permanently blocked at t=1s and MMC 11 output power is reduced to zero.…”

Section: B) Topology a -Tri-pole Uhvdc Linkmentioning

confidence: 99%

“…Proper operation of an LCC-UHVDC link with such large power rating requires the inverter side to be connected to a strong ac network in order to prevent converter commutation failure during ac network disturbances [10,11]. LCC-HVDC links consumes large reactive power that can reach to 50% or 60% of the transmitted dc power, and it varies with the magnitude of dc power being exchanged between two ac networks [9,12,13]. Filter capacitors plus dedicated switched shunt capacitors are widely used to compensate the reactive power of the LCC in a discrete fashion, but this has proven to cause significant instantaneous reactive power mismatch at the filter bus that can create large over-voltages in weak ac networks.…”

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confidence: 99%

Multi‐pole voltage source converter HVDC transmission systems

Ased

Williams

2016

IET Generation, Transmission & Distribution

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Abstract-This paper connects several modular multilevel converters to form multi-pole VSC-HVDC links which are suited for bulk power evacuation, with increased resiliency to ac and dc network faults. The proposed arrangements resemble symmetrical and asymmetrical HVDC links that can be used for bulk power transfer over long distances with reduced transmission losses, and for the creation of multi-terminal super-grids currently being promoted for transitional dc grids in Europe. The technical feasibility of the proposed systems is assessed using simulations on symmetrical and asymmetrical tri-pole VSC-HVDC links, including the case of permanent pole-to-ground dc faults. I. INTRODUCTIONSeveral ultra-high voltage dc (UHVDC) transmission systems based on the current source line commutating converter (LCC) with dc operating voltages up to ±800kV (800kV per pole) and 7200MW rated power have been installed to supply mega cities [1][2][3][4][5][6][7][8][9]. The choice of LCC is mainly driven by the established track record of LCC in bulk power evacuation over long distances for over 50 years. Proper operation of an LCC-UHVDC link with such large power rating requires the inverter side to be connected to a strong ac network in order to prevent converter commutation failure during ac network disturbances [10,11]. LCC-HVDC links consumes large reactive power that can reach to 50% or 60% of the transmitted dc power, and it varies with the magnitude of dc power being exchanged between two ac networks [9,12,13]. Filter capacitors plus dedicated switched shunt capacitors are widely used to compensate the reactive power of the LCC in a discrete fashion, but this has proven to cause significant instantaneous reactive power mismatch at the filter bus that can create large over-voltages in weak ac networks. This drawback has been avoided in recent LCC-HVDC transmission links installations by replacing the switched capacitors with a line commutating dynamic reactive power compensator that autonomously and seamlessly adjusts its reactive power output in an attempt to maintain constant voltage at the filter bus [6-8, 12, 14-21].A self-commutated voltage source converter high-voltage dc (VSC-HVDC) transmission system presents a competitive alternative to the LCC-HVDC transmission system, for transmitting power over long distances, without the commutation failure shortcoming of the LCC systems. But converter topologies employed in the early VSC-HVDC transmission systems limit their power rating and dc operating voltage to 500MW and ±200kV (symmetrical mono-pole), which are much lower than that of LCC-HVDC links [9,[22][23][24][25][26][27][28][29][30][31]. To increase the power handing and dc operating voltage of VSC-HVDC transmission systems, modular and hybrid multilevel voltage source converters have been adopted in preference to traditional two-level and neutral-point clamped (NPC) converters [32][33][34][35][36][37][38]. Modular and hybrid multilevel converters allow dc operating Multi-Pole Voltage Source Converter HVDC Transmissi...

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“…The use of IIC has such drawbacks as high laboriousness of analysis of oscillograms of emergency processes with low observability of the EPS, the limited application of results when the configuration of this EPS is changed and in other power systems, in cases of occurrence of previously disturbed effects and a large time expenditure due to the inability to conduct large-scale full-scale tests in EPS [1,2,3]. Thereby, the main analysis tool of the electric power systems' work is simulation.…”

Section: Introductionmentioning

confidence: 99%