Detailed Equivalent VSC-HVDC Modelling for Time Domain Harmonic Stability Studies in Wind Power Plants

Research output: Research - peer-reviewJournal article

Abstract

This paper presents a detailed equivalent modelling approach of the modular multi-level cascaded converter (MMCC) voltage source converter high voltage direct current (VSC-HVDC) in electromagnetic transient programs (EMTPs). The presented MMCC model will be evaluated based on comparison with the conventional modelling approach of the converter in terms of simulation speed
and accuracy. The paper introduces the least mean square error as a figure of merit of the accuracy of the presented model. It will be shown that the simulation run time is decreased by an order of more than 1250 for a one converter system with 201 voltage levels, without loss of accuracy compared to
conventional modelling of the converter. Harmonic stability is a core concern for both existing and future offshore wind power plants (OWPPs). A harmonic stability study will be undertaken with focus on the number of wind turbine generators in service, as this is known to influence the harmonic stability in OWPPs. The paper demonstrates the necessity of the inclusion of a detailed equivalent model of the HVDC converter for harmonic stability studies in the time domain. By implementation of active filtering in the converters it will be shown that possible harmonic instability can be successfully supressed.
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This paper presents a detailed equivalent modelling approach of the modular multi-level cascaded converter (MMCC) voltage source converter high voltage direct current (VSC-HVDC) in electromagnetic transient programs (EMTPs). The presented MMCC model will be evaluated based on comparison with the conventional modelling approach of the converter in terms of simulation speed
and accuracy. The paper introduces the least mean square error as a figure of merit of the accuracy of the presented model. It will be shown that the simulation run time is decreased by an order of more than 1250 for a one converter system with 201 voltage levels, without loss of accuracy compared to
conventional modelling of the converter. Harmonic stability is a core concern for both existing and future offshore wind power plants (OWPPs). A harmonic stability study will be undertaken with focus on the number of wind turbine generators in service, as this is known to influence the harmonic stability in OWPPs. The paper demonstrates the necessity of the inclusion of a detailed equivalent model of the HVDC converter for harmonic stability studies in the time domain. By implementation of active filtering in the converters it will be shown that possible harmonic instability can be successfully supressed.
Original languageEnglish
JournalEnergies
Number of pages24
ISSN1996-1073
StateSubmitted - 2018
Publication categoryResearch
Peer-reviewedYes

    Research areas

  • Active filtering, Harmonic stability, Multi-level cascaded converters (MMCCs), Offshore wind power plants (OWPPs), PSCAD/EMTDC, Total inter-harmonic distortion (TIHD) index, Voltage source converter high voltage direct current (VSC-HVDC), Wind turbine generators (WTG)
ID: 222291682