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Blar i NTNU Open på forfatter "Freytes, Julian"

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    • Analysis of MMC Dynamics in DQZ Coordinates for Vertical and Horizontal Energy Balancing Control 

      Bergna-Diaz, Gilbert; Freytes, Julian; Guillaud, Xavier; D'Arco, Salvatore; Suul, Jon Are Wold (Chapter, 2018)
      This paper presents a control system implementation in dqz-coordinates for equalizing the average energies stored in each arm of a Modular Multilevel Converter (MMC); a control objective that is typically referred to as ...
    • Generalized Voltage-based State-Space Modelling of Modular Multilevel Converters with Constant Equilibrium in Steady-State 

      Bergna-Diaz, Gilbert; Freytes, Julian; Guillaud, Xavier; D'Arco, Salvatore; Suul, Jon Are Wold (Journal article; Peer reviewed, 2018)
      Abstract: This paper demonstrates that the sum and difference of the upper and lower arm voltages are suitable variables for deriving a generalized state-space model of an MMC which settles at a constant equilibrium in ...
    • Improving Small-Signal Stability of an MMC with CCSC by Control of the Internally Stored Energy 

      Freytes, Julian; Bergna Diaz, Gilbert; Suul, Jon Are Wold; D'Arco, Salvatore; Gruson, Francois; Colas, Frederic; Saad, Hani; Guillaud, Xavier (Journal article; Peer reviewed, 2017)
      The DC-side dynamics of Modular Multilevel Converters (MMCs) can be prone to poorly damped oscillations or stability problems when the second harmonic components of the arm currents are mitigated by a Circulating Current ...
    • Small-signal model analysis of droop-controlled modular multilevel converters with circulating current suppressing controller 

      Freytes, Julian; Bergna Diaz, Gilbert; Suul, Jon Are Wold; D'Arco, Salvatore; Saad, Hani; Guillaud, Xavier (Chapter, 2017)
      This paper presents a small signal eigenvalue analysis applied to a droop-controlled HVDC terminal based on the Modular Multilevel Converter (MMC) topology. The applied linearised model is derived from previous modelling ...
    • State-space modelling with steady-state time invariant representation of energy based controllers for modular multilevel converters 

      Freytes, Julian; Bergna-Diaz, Gilbert; Suul, Jon Are Wold; D'Arco, Salvatore; Saad, Hani; Guillaud, Xavier (Chapter, 2017)
      The average value model of the Modular Multilevel Converter (MMC) is in general non-linear with time periodic variables. Recent developments demonstrated how the MMC model can be transformed into a a Steady-State Time ...

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