1 citations · 2 across the 10 of their papers we have counts for
11 papers
Improved Droop Control in DC Microgrids via Voltage-Locked Loop Synchronization
Ognjen Stanojev, Jovan Krajacic, Enea Bianda +2
DC microgrids are low- or medium-voltage networks designed to connect and manage DC-based sources and loads. A key challenge in operating DC microgrids is maintaining the DC voltag…
Disturbance-Observer-Based Grid-Forming Control for Unbalanced Grids
Juho Määttä, Marko Hinkkanen, Tuure Nurminen +4
This article proposes a grid-forming control method for operation under unbalanced grid-voltage conditions. The method regulates the positive-sequence active power delivered to the…
A Feedback Stability Theorem for Frequency-dependent Compensation of Excess and Lack of Passivity
Pol Jane-Soneira, Gösta Stomberg, Ognjen Stanojev +2
This article studies the stability of feedback interconnections of linear time-invariant systems based on frequency-dependent passivity indices. Using these frequency-dependent pas…
Exploring Converter Control Duality in Microgrids: AC Grid-Forming vs DC Droop Control
Jovan Krajacic, Ognjen Stanojev, Mario Schweizer +3
Power electronic converters are fundamental building blocks of both AC and DC microgrids, enabling the integration of renewable energy sources, energy storage systems, electronic l…
Grid-Forming Characterization in DC Microgrids
Jovan Krajacic, Ognjen Stanojev, Mario Schweizer +3
DC microgrids are converter-based electrical networks that are increasingly being used in various applications, including data centers and industrial distribution systems. A centra…
The role of VSG parameters in shaping small-signal SG dynamics
Ferdinand Geuss, Orcun Karaca, Mario Schweizer +1
We derive a small-signal transfer function for a system comprising a virtual synchronous generator (VSG), a synchronous generator (SG), and a load, capturing voltage and frequency…
Grid-Forming Vector Current Control FRT Modes Under Symmetrical and Asymmetrical Faults
Ognjen Stanojev, Orcun Karaca, Mario Schweizer
Recent research has shown that operating grid-connected converters using the grid-forming vector current control (GFVCC) scheme offers significant benefits, including the simplicit…
Robust black start of an offshore wind farm with DRU based HVDC link using power synchronization control
Orcun Karaca, Ioannis Tsoumas, Mario Schweizer +2
This paper introduces a universal power synchronization controller for grid-side control of the wind turbine conversion systems in an offshore wind farm with a diode rectifier in t…
On the input admittance of a universal power synchronization controller with droop controllers
Orcun Karaca, Irina Subotic, Lennart Harnefors +1
Recent work has proposed a universal framework that integrates the well-established power synchronization control into vector current control. Using this controller for the paralle…
On the SDP Relaxation of Direct Torque Finite Control Set Model Predictive Control
Luca M. Hartmann, Orcun Karaca, Tinus Dorfling +2
This paper formulates a semidefinite programming relaxation for a long horizon direct-torque finite-control-set model predictive control problem. In parallel with this relaxation,…
Damping Wind Farm Resonances with Current Based Model Predictive Pulse Pattern Control
Orcun Karaca, Ioannis Tsoumas, Tinus Dorfling +2
It is well-established that a proportional current control gain emulates a resistor in the converter output impedance. Even though this resistance can provide additional damping to…