Recent Advances in HVDC and UHVDC Transmission [Happenings]

Keim, Tom; Bindra, Ashok

doi:10.1109/mpel.2017.2760110

Cited by 7 publications

(5 citation statements)

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“…Being a mature technology used for decades and more suitable for overhead high-power transmissions [8,54], the number of LCC based projects is significantly higher than their VSC counterparts. Although the latter provides more technical advantages.…”

Section: Main Hvdc Converter Suppliersmentioning

confidence: 99%

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HVDC Transmission: Technology Review, Market Trends and Future Outlook

Alassi

Bañales

Ellabban

et al. 2019

Renewable and Sustainable Energy Reviews

281

104

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HVDC systems are playing an increasingly significant role in energy transmission due to their technical and economic superiority over HVAC systems for long distance transmission. HVDC is preferable beyond 300-800 km for overhead point-to-point transmission projects and for the cable based interconnection or the grid integration of remote offshore wind farms beyond 50-100 km. Several HVDC review papers exist in literature but often focus on specific geographic locations or system components. In contrast, this paper presents a detailed, up-to-date, analysis and assessment of HVDC transmission systems on a global scale, targeting expert and general audience alike. The paper covers the following aspects: technical and economic comparison of HVAC and HVDC systems; investigation of international HVDC market size, conditions, geographic sparsity of the technology adoption, as well as the main suppliers landscape; and high-level comparisons and analysis of HVDC system components such as Voltage Source Converters (VSCs) and Line Commutated Converters (LCCs), etc. The presented analysis are supported by practical case studies from existing projects in an effort to reveal the complex technical and economic considerations, factors and rationale involved in the evaluation and selection of transmission system technology for a given project. The contemporary operational challenges such as the ownership of Multi-Terminal DC (MTDC) networks are also discussed. Subsequently, the required development factors, both technically and regulatory, for proper MTDC networks operation are highlighted, including a future outlook of different HVDC system components. Collectively, the role of HVDC transmission in achieving national renewable energy targets in light of the Paris agreement commitments is highlighted with relevant examples of potential HVDC corridors.

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Section: Main Hvdc Converter Suppliersmentioning

confidence: 99%

“…Currently, VSC-HVDC station losses vary based on the adopted topology, with a typical magnitude of 1% per station (varies depending on the topology and switching frequency, and estimated to be less by some recent sources [54]). Notably, it is predicted that new MMC station losses could approach LCC losses range by 2020.…”

Section: Modular Multilevel Convertersmentioning

confidence: 99%

HVDC Transmission: Technology Review, Market Trends and Future Outlook

Alassi

Bañales

Ellabban

et al. 2019

Renewable and Sustainable Energy Reviews

281

104

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“…The converter valve is an essential part of HVDC transmission project to achieve AC/DC and DC/AC power conversion [1]. The saturable reactor plays an important role in the thyristor-based line-commutated converter (LCC) to ensure the thyristors' reliable operation under various voltage and current stresses [2][3][4][5][6][7][8][9][10][11]. The operating thermal characteristics of the saturable reactor are critical factors affecting its long-term operating reliability and aging characteristics.…”

Section: Introductionmentioning

confidence: 99%

Research on Losses and Heat Dissipation of Saturable Reactor Used in Converter Valve

Liu¹,

Li²,

Chang³

et al. 2022

IEEE Access

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Based on the analysis of the principle and structure of a saturable reactor used in a converter valve of HVDC transmission, this paper analyzes its power loss composition and summarizes and derives the power loss equations. According to finite element analysis, the saturable reactor is modeled, its transient electromagnetic characteristics are simulated, and the core loss density distribution is studied. The influence of the cooling circuit and air on the heat dissipation of the saturable reactor is studied. The power loss density obtained by the electromagnetic field finite element analysis is mapped as the heat source to the finite fluid element for thermal simulation in order to obtain the spatial temperature distribution of the saturable reactor. The maximum temperature of the case is about 68.5℃, while the maximum temperature of the iron core is about 87.9℃. The converter valve operation test validates the accuracy of the heat dissipation analysis and temperature field simulation. The research results can serve as a reference for the design of saturable reactors used in converter valves.

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“…High voltage direct current (HVDC) transmission technology is an efficient approach to deliver bulk renewable power over long distance [1] [2]. As the increased commission of line-commutated converter (LCC) based HVDC projects, two or more HVDC links tend to feed into one regional power grid and form a multi-infeed HVDC system, such as the East China Power Grid and the Southern China Power Grid.…”

Section: Introductionmentioning

confidence: 99%

A Cascaded Converter Interfacing Long-Distance HVdc and Back-to-Back HVdc Systems

Xiang

Ren-gang

Chang

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract-This paper proposes a cascaded converter dedicated to long-distance HVDC infeed and asynchronous back-to-back interconnection of receiving grids. The cascaded converter is consisted of MMCs in series and parallel connection, meeting the high DC voltage and power demand of HVDC system. It realizes hierarchical feeding and asynchronous interconnection of receiving grids, optimizing the multi-infeed short circuit ratio and improving the flexibility of the receiving grids. The topology and operating characteristics of the cascaded converter are introduced in detail. The multi-infeed short-circuits ratio (MISCR) and the maximum power infeed of the cascaded converter based HVDC systems are analyzed. Various feasible operating modes with online switching strategies of the cascaded converter are studied to improve the operational flexibility of the system. The simulation results verify the effectiveness of the control strategy of the HVDC system embedding the cascaded converter. The DC faults clearing strategy and operating modes switching strategies are also validated.

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Recent Advances in HVDC and UHVDC Transmission [Happenings]

Cited by 7 publications

References 0 publications

HVDC Transmission: Technology Review, Market Trends and Future Outlook

HVDC Transmission: Technology Review, Market Trends and Future Outlook

Research on Losses and Heat Dissipation of Saturable Reactor Used in Converter Valve

A Cascaded Converter Interfacing Long-Distance HVdc and Back-to-Back HVdc Systems

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