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Initialisation of a hybrid AC/DC power system for harmonic stability analysis using a power flow formulation

High Voltage 2020年第5期5卷 534-542页

作者： Aleksandra Lekić Hakan Ergun jef beerten Department of Electrical Engineering(ESAT-ELECTA) KU LeuvenLeuvenBelgium

This study presents the initialisation of a hybrid alternating current/direct current(AC/DC)power system to determine the operation point around which the system is linearised as a starting point for an electromagnetic or harmonic stability *** this end,each AC or DC power system component is modelled in the Fourier transform domain and further adjusted to a simplified representation compatible with a power flow *** study also presents how voltage source converter(VSC)high-voltage DC-based systems can be analysed when the different VSC controls are *** result of the power flow solution is then used for the power converters’initialisation.

关键词： AC/DC system formulation

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Frequency domain based DC fault analysis for bipolar HVDC grids

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Journal of Modern Power Systems and Clean Energy 2017年第4期5卷 548-559页

作者： Mian WANG jef beerten Dirk Van HERTEM EnergyVille/Electa Research Group Electrical Engineering Department ESATKU Leuven3001 HeverleeBelgium

This paper proposes a frequency domain based methodology to analyse the influence of High Voltage Direct Current(HVDC) configurations and system parameters on the travelling wave behaviour during a DC fault. The method allows us to gain deeper understanding of these influencing parameters. In the literature, the majority of DC protection algorithms essentially use thefirst travelling waves initiated by a DC fault for fault discrimination due to the stringent time constraint in DC grid protection. However, most protection algorithms up to now have been designed based on extensive time domain simulations using one specific test system. Therefore, general applicability or adaptability to different configurations and system changes is not by default ensured, and it is difficult to gain in-depth understanding of the influencing parameters through time domain simulations. In order to analyse the first travelling wave for meshed HVDC grids, voltage and current wave transfer functions with respect to the incident voltage wave are derived adopting Laplace domain based component models. The step responses obtained from the voltage transfer functions are validated by comparison against simulations using a detailed model implemented in PSCADTM. Then, the influences of system parameters such as the number of parallel branches, HVDC grid configurations and groundings on the first travelling wave are investigated by analysing the voltage and current transfer functions.

关键词： HVDC grids DC grid protection Travelling wave Frequency domain analysis Transfer function

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Review and Outlook of HVDC Grids as Backbone of Transmission System

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 797-810页

作者： Mian Wang Ting An Hakan Ergun Yuanliang Lan Bjarne Andersen Marcio Szechtman Willem Leterme jef beerten Dirk Van Hertem KU Leuven/Energy Ville Belgium Global Energy Interconnection Research Institute SGCCBeijing 102209China Andersen Power Electronic Solutions Ltd Bexhill on SeaUnited Kingdom Eletrobras Brazil

HVDC technology has undergone many major developments in the past decades,resulting in higher power ratings,increased efficiency,and the availability of effective means for HVDC grid *** developments have made overlay HVDC grids a viable option to shift towards a carbon-free power system,by enabling optimal use of renewable *** particular,overlay HVDC grids greatly increase the prospect of building(trans-)continental supergrids to facilitate global economic ***,overlay HVDC grids still encounter challenges due to the distance and amount of power *** paper focuses on analyzing the readiness of the current technologies and the challenges associated with overlay HVDC *** in-depth analysis is carried out to evaluate the applicability of current technologies for overlay HVDC *** on the review of recent research and development efforts,the gaps and challenges towards the realization of a global HVDC grid are summarized.

关键词： Global energy interconnection(GEI) overlay HVDC grid renewable energy supergrid

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