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  • 1.
    Hasan, Md Rokibul
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Vanfretti, Luigi
    KTH, School of Electrical Engineering (EES), Electric Power Systems. SF, Norwegian Transmission System Operator, Norway .
    Li, Wei
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Khan, Naveed Ahmad
    Generic High Level VSC-HVDC Grid Controls and Test Systems for Offline and Real Time Simulation2014In: 9th International: 2014 Electric Power Quality and Supply Reliability Conference, PQ 2014 - Proceedings, IEEE Computer Society, 2014, p. 57-64Conference paper (Refereed)
    Abstract [en]

    This article describes generic high level control models for VSC-HVDC grid systems. An average value model of the voltage source converter (VSC) is used; it includes the vector current control strategy. As an improvement to traditional conventional high-level control systems, this paper includes dc voltage, negative sequence current and dc voltage droop control loops. To validate the controller's performances, two tests systems were developed: a point-to-point link and a four-terminal DC grid. Both offline and real-time simulations are carried out for several test scenarios. A methodology for calibrating controller parameters is presented and used to tune the controls of each test system considering the different scenarios presented. All simulation models were developed in SimPowerSystem/Simulink and prepared using the RT-LAB software from Opal-RT for real-time simulation; real-time simulation performance of the simulation models is also discussed.

  • 2.
    Vanfretti, Luigi
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Khan, N. A.
    Li, Wei
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hasan, Md Rokibul
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Haider, A.
    Generic VSC and low level switching control models for offline simulation of VSC-HVDC systems2014In: 9th International: 2014 Electric Power Quality and Supply Reliability Conference, PQ 2014 - Proceedings, IEEE Computer Society, 2014, p. 265-272Conference paper (Refereed)
    Abstract [en]

    This article proposes and implements generic and detailed voltage source converter (VSC) models, and low-level switching control models for simulation of HVDC networks using Modular Multilevel Converters (MMCs) or conventional two-level converters. The low level control approaches for both MMCs and two-level converters are explained. The behavior of the test HVDC networks is analyzed with the detailed model of both types of converter. In addition, high level controls are briefly explained, focusing on their application in DC grids. The simulation results of test networks validate the proposed high level controls and low level switching controls for simulation with detailed models of MMCs and conventional two-level converters.

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