Converter Stations for 800 kV HVDC

Astrom, U.; Lescale, V.

doi:10.1109/icpst.2006.321754

Cited by 18 publications

(5 citation statements)

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“…Also, according to the mentioned principles, the IGBT pair and its paralleled MOVs within the auxiliary breaker are designed to withstand the on-state voltage drop sum of the NFB/NUFBS series-connected FB-SMs within one unit. If configured, the transformer TX should be designed for the same rated voltage and power as those of the CHB converter, whereas isolation and insulation are necessary for such HVDC applications [1], [32]. In general, for the given ac network impedances L and R, active and reactive power of the station ac grid (Pg and Qg) are controlled through the ac grid current, which can be regulated by modifying the phase and magnitude of the station output ac voltage vC based on:…”

Section: Energy Storage System Sizingmentioning

confidence: 99%

A Novel Converter Station Structure for Improving Multiterminal HVDC System Resiliency Against AC and DC Faults

Wang

Ahmed

Adam

et al. 2020

IEEE Trans. Ind. Electron.

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In an effort to minimize the power disruption between a dc grid and ac grids that host power converters during ac and dc network faults, this paper proposes a novel converter station structure to improve ac and dc fault ride-through performance of the multiterminal HVDC grid. The proposed structure consists of two independent ac and dc interfacing circuits, which are a half-bridge modular multilevel converter and a cascaded Hbridge (CHB) based energy storage system. Taking the advantages of high controllability and flexibility of the independent CHB converter and ease of integrating energy modules, a decoupled power relationship between the ac and dc sides is achieved, which is important for enhancing ac and dc fault performance. Operation of the proposed converter station under normal conditions and during ac and dc faults is explained, with the control system presented. Simulation validation of the proposed structure on a three-terminal HVDC grid confirms the enhanced performance, including the continuous operation during ac and dc faults with negligible power transfer disruption.

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Section: Energy Storage System Sizingmentioning

confidence: 99%

A Novel Converter Station Structure for Improving Multiterminal HVDC System Resiliency Against AC and DC Faults

Wang

Ahmed

Adam

et al. 2020

IEEE Trans. Ind. Electron.

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“…The graph partition is an optimal process to divide the original graph, 0 ( , ) into smaller sub-graphs ( , ) , ( , ),…, ( , ) in parallel to minimize the total cut edges between sub-sets, subject to the sizes of sub-graphs are closed to equal as shown as follow. 1 ( ,..., ) , 1,...,…”

Section: Graph Partitionmentioning

confidence: 99%

“…LCC, comparing to voltage source converter (VSC) is advantageous with higher transmission voltage and larger transmission capacity. LCC based HVDC projects have been built in the past decades [1] and are expected to be built more in the future [2]. Power flow analysis on the AC/DC hybrid system is fundamental for system planning, operation, and control.…”

Section: Introductionmentioning

confidence: 99%

A Graph Computation based Sequential Power Flow Calculation for Large-Scale AC/DC Systems

Feng

Yuan

et al. 2019

2019 IEEE Power &Amp; Energy Society General Meeting (PESGM)

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This paper proposes a graph computation based sequential power flow calculation method for Line Commutated Converter (LCC) based large-scale AC/DC systems to achieve a high computing performance. Based on the graph theory, the complex AC/DC system is first converted to a graph model and stored in a graph database. Then, the hybrid system is divided into several isolated areas with graph partition algorithm by decoupling AC and DC networks. Thus, the power flow analysis can be executed in parallel for each independent area with the new selected slack buses. Furthermore, for each area, the node-based parallel computing (NPC) and hierarchical parallel computing (HPC) used in graph computation are employed to speed up fast decoupled power flow (FDPF). Comprehensive case studies on the IEEE 300-bus, polished South Carolina 12,000-bus system and a China 11,119-bus system are performed to demonstrate the accuracy and efficiency of the proposed method.

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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 .…”

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

confidence: 99%

“…Several 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.…”

Section: Introductionmentioning

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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Converter Stations for 800 kV HVDC

Cited by 18 publications

References 0 publications

A Novel Converter Station Structure for Improving Multiterminal HVDC System Resiliency Against AC and DC Faults

A Novel Converter Station Structure for Improving Multiterminal HVDC System Resiliency Against AC and DC Faults

A Graph Computation based Sequential Power Flow Calculation for Large-Scale AC/DC Systems

Multi‐pole voltage source converter HVDC transmission systems

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