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  • 1.
    Shakerighadi, Bahram
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Johansson, N.
    Eriksson, R.
    Mitra, P.
    Bolzoni, A.
    Clark, Angel
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Nee, Hans-Peter
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    An overview of stability challenges for power-electronic-dominated power systems: The grid-forming approach2022In: IET Generation, Transmission & Distribution, ISSN 1751-8687, E-ISSN 1751-8695Article in journal (Refereed)
    Abstract [en]

    Inverter-based generators (IBGs) are becoming popular in modern power systems. When the penetration of IBGs is increasing in power systems, new stability, protection, and monitoring challenges are introduced in the grid. Grid-forming (GFM) control of converters is seen as a promising solution for future power grids to overcome particular stability challenges. Here, the technical challenges of the GFM-based IBGs are reviewed from the point of view of TSOs and academic research. The properties of different GFM methods are studied for different GFM-based IBGs for a single grid-tied IBG and using the IEEE 9-bus test system. Simulation results are provided by using the PSCAD-EMT simulation software. 

  • 2.
    Clark, Angel
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Mitra, Pinaki
    Johansson, Nicklas
    Ghandari, Mehrdad
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Development of a Base Model in RMS and EMT Environment to Study Low Inertia System2021In: IEEE General Meeting Power& Energy Society, Institute of Electrical and Electronics Engineers (IEEE) , 2021Conference paper (Refereed)
    Abstract [en]

    This research performs a detailed comparison of fundamental frequency positive sequence (RMS) and electromagnetic transient (EMT) based simulations of a two-area four-machine system with power-electronics based non-synchronous generation (NSG). The RMS based simulations are performed in PowerFactory and the equivalent EMT simulations are performed in PSCAD. Parity between the two-area four-machine model constructed in PSCAD and PowerFactory is rigorously established. The default fully rated wind converter model from PowerFactory with fault ride through is adopted in PSCAD, utilizing the same control strategy. The transient stability of the two-area four-machine model with NSG in PSCAD and PowerFactory is evaluated with respect to one another. Specific RMS modeling limitations are also discussed in this paper.

  • 3.
    Clark, Angel
    et al.
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    Mitra, Pinaki
    Johansson, Nicklas
    Ghandari, Mehrdad
    KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Electric Power and Energy Systems.
    EMT and RMS Analysis of a Two-Area System with Wind Power Generation2020Conference paper (Refereed)
    Abstract [en]

    In this work, a two-area four-machine system with wind power generation is developed in parallel in bothRMS and EMT environments. The fundamental frequency positive sequence (RMS) model is developed in DIgSILENTPowerFactory and the electromagnetic transient (EMT) model, in PSCAD. Specifically, this paper focuses on the systematicdevelopment of the comparable converter model in both environments. To model the wind farm, a PSCAD EMTvoltage source converter model is reconfigured and simplified to replicate the control of the default PowerFactory convertermodel that is used. The performance of the two models is assessed within a simple system, before integrating the windfarm into the two-area system. The selection of the control parameters is chosen in both models to provide a comparableresponse for a step change to the reference power. The default fault ride through (FRT) control is enabled in PowerFactoryand a FRT control strategy is developed in PSCAD to achieve a realistic response. A three-phase short circuit fault on a paralleltransmission line segment and a 100 MW load step change are independently applied in order to compare the dynamicresponse of both models. The specific limitations of converter modelling in RMS simulations are discussed.

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