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2021 | OriginalPaper | Chapter

6. HVDC in the Future Power Systems

Authors : Quanyu Zhao, Javier García-González, Aurelio García-Cerrada, Javier Renedo, Luis Rouco

Published in: Transmission Expansion Planning: The Network Challenges of the Energy Transition

Publisher: Springer International Publishing

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Abstract

High-voltage direct current (HVDC) systems are called to play an important role in future power systems, and therefore, transmission system operators (TSOs) are keen to explore design and analysis tools for those systems embedded in traditional high-voltage alternating current (HVAC) systems. This chapter presents the fundamentals of HVDC systems and illustrates how optimal power flow (OPF) calculations can be carried out in hybrid AC/DC systems when the two sides are interfaced through voltage source converters (VSCs), which is an arrangement with a promising future for its many advantages. Tools for OPF studies could help TSOs assess the profitability of modern high-voltage AC/DC systems at the transmission expansion planning (TEP) stage and to operate them optimally once they are installed. The OPF algorithm presented in this chapter can deal with large-scale hybrid power networks with a fairly detailed representation of the generation and transmission systems (both AC and DC) including detailed loss models. Two alternative formulations of the algorithm are described here in detail: (a) a nonlinear approach to OPF and (b) a linear one. The two alternatives are compared thoroughly in a case study. Results obtained with the nonlinear OPF model are more accurate than those obtained with the linear OPF model, but the latter presents a much lower computational burden. The linear OPF model could be useful when analyzing large-scale systems in which only active power flows are of interest.

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previous chapter Offshore Grid Development as a Particular Case of TEP

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August Uno Lamm (May 22, 1904 to June 1, 1989) was a Swedish electrical engineer and inventor. During his career, Lamm obtained 150 patents.

With a back-to-back HVDC configuration, two independent neighboring systems with different and incompatible electrical parameters (frequency, voltage level, short-circuit power level) are connected via a DC link. Both rectifier (conversion from AC to DC) and inverter (conversion from DC to AC) are located in the same station.

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Title: HVDC in the Future Power Systems
Authors: Quanyu Zhao
Javier García-González
Aurelio García-Cerrada
Javier Renedo
Luis Rouco
Publisher: Springer International Publishing
Book: Transmission Expansion Planning: The Network Challenges of the Energy Transition
Print ISBN: 978-3-030-49427-8

Electronic ISBN: 978-3-030-49428-5

Copyright Year: 2021
DOI: https://doi.org/10.1007/978-3-030-49428-5_6