The Effects of Filter Capacitors on Cable Ripple at Different Sections of the Wind Farm Based Multi-Terminal DC System

Xiaoyun Rong, Jonathan K. H. Shek, D. Ewen Macpherson and Phil Mawby
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Xiaoyun Rong: School of Engineering, University of Warwick, Library Rd, Coventry CV4 7AL, UK
Jonathan K. H. Shek: Institute for Energy Systems, School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, UK
D. Ewen Macpherson: Institute for Energy Systems, School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, UK
Phil Mawby: School of Engineering, University of Warwick, Library Rd, Coventry CV4 7AL, UK

Energies, 2021, vol. 14, issue 21, 1-19

Abstract: In most DC power systems, power electronic devices can introduce ripple content into the DC grid, where large input ripple currents on the DC link can have a negative influence. Under these circumstances, DC side filters play an important role in the reduction of ripple content. In this paper, based on a full detailed closed loop model of the entire offshore wind farm multi-terminal DC network, the effect of filter capacitors connected at different sections of the system on the limitation of the AC ripple content, particularly in the DC cables, is studied. In contrast to other work on HVDC for offshore wind, where simplified or equivalent circuits are mainly used while concentrating on the power and control system, this study can be regarded as the specific study of filter capacitors operating within a detailed system model. Utilising the advantages of PLECS, which is a highly effective tool in the simulation of power electronic circuits, no small-signal or simplified equivalent models are used in the system, and the entire study is based on detailed and accurate models of the semiconductor elements and transformers, which help to provide more realistic simulation results and a better understanding of the system. Another novel point in this paper is a new concept, relative losses, which is proposed to simplify extensively the calculation of losses in this research. Finally, the size of the filter capacitors at different sections of the system under different situations is suggested.

Keywords: DC side capacitors; DC-DC converter; FFT analysis; relative losses; total harmonic distortion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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