12 citations · 25 across the 20 of their papers we have counts for
22 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…
Limitations of RMS-based Stability Assessment of Converter-based Grids: A Case Study
Pol Jane-Soneira, Ognjen Stanojev, Francisco Canales Perez +3
The increasing penetration of power electronic converters in industrial grids introduces stability challenges at frequencies well above the electromechanical range of traditional p…
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…
Dynamic Optimization of Virtual Inertia and Damping in Converter-Based Power Systems
Jovan Krajacic, Maitraya Avadhut Desai, Ognjen Stanojev +1
The transition towards a sustainable power system is enabled by the replacement of conventional synchronous generators with converter-interfaced renewable energy sources. However,…
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…
EMT and RMS Modeling of Thyristor Rectifiers for Stability Analysis of Converter-Based Systems
Ognjen Stanojev, Pol Jane Soneira, Gösta Stomberg +1
Thyristor rectifiers are a well-established and cost-effective solution for controlled high-power rectification, commonly used for hydrogen electrolysis and HVDC transmission. Howe…
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…
Effect of Dispatch Decisions on Small-Signal Stability of Converter-Dominated Power Systems
Maitraya Avadhut Desai, Ognjen Stanojev, Simon Muntwiler +1
Small-signal stability of modern converter-dominated power systems has been the subject of extensive research, particularly from the perspective of device-level control design for…
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…
A Stiffness-Oriented Model Order Reduction Method for Low-Inertia Power Systems
Simon Muntwiler, Ognjen Stanojev, Andrea Zanelli +2
This paper presents a novel model order reduction technique tailored for power systems with a large share of inverter-based energy resources. Such systems exhibit an increased leve…
Privacy-Preserving Distributed Market Mechanism for Active Distribution Networks
Matthias Franke, Ognjen Stanojev, Lesia Mitridati +1
Amidst the worldwide efforts to decarbonize power networks, Local Electricity Markets (LEMs) in distribution networks are gaining importance due to the increased adoption of renewa…
Safe Reinforcement Learning for Strategic Bidding of Virtual Power Plants in Day-Ahead Markets
Ognjen Stanojev, Lesia Mitridati, Riccardo de Nardis di Prata +1
This paper presents a novel safe reinforcement learning algorithm for strategic bidding of Virtual Power Plants (VPPs) in day-ahead electricity markets. The proposed algorithm util…
Tractable Identification of Electric Distribution Networks
Ognjen Stanojev, Lucien Werner, Steven Low +1
The identification of distribution network topology and parameters is a critical problem that lays the foundation for improving network efficiency, enhancing reliability, and incre…
Sparse Structure Design for Stochastic Linear Systems via a Linear Matrix Inequality Approach
Yi Guo, Ognjen Stanojev, Gabriela Hug +1
In this paper, we propose a sparsity-promoting feedback control design for stochastic linear systems with multiplicative noise. The objective is to identify a sparse control archit…
Fast Mapping of Flexibility Regions at TSO-DSO Interfaces under Uncertainty
Alice Patig, Ognjen Stanojev, Petros Aristidou +2
The gradual decommissioning of fossil fuel-driven power plants, that traditionally provide most operational flexibility in power systems, has led to more frequent grid stability is…
Online Feedback Droop Scheduling in Distribution Grids for Frequency and Local Voltage Control
Ognjen Stanojev, Yi Guo, Gabriela Hug
This paper presents a novel framework for collective control of Distributed Energy Resources (DERs) in active Distribution Networks (DNs). The proposed approach unifies the commonl…
Multiple Ancillary Services Provision by Distributed Energy Resources in Active Distribution Networks
Ognjen Stanojev, Yi Guo, Petros Aristidou +1
The electric power system is currently experiencing radical changes stemming from the increasing share of renewable energy resources and the consequent decommissioning of conventio…
Improving Stability of Low-Inertia Systems using Virtual Induction Machine Synchronization for Grid-Following Converters
Ognjen Stanojev, Uros Markovic, Petros Aristidou +1
This paper presents a novel strategy for the synchronization of grid-following Voltage Source Converters (VSCs) in power systems with low rotational inertia. The proposed synchroni…
A Reinforcement Learning Approach for Fast Frequency Control in Low-Inertia Power Systems
Ognjen Stanojev, Ognjen Kundacina, Uros Markovic +3
The electric grid is undergoing a major transition from fossil fuel-based power generation to renewable energy sources, typically interfaced to the grid via power electronics. The…
MPC-Based Fast Frequency Control of Voltage Source Converters in Low-Inertia Power Systems
Ognjen Stanojev, Uros Markovic, Petros Aristidou +3
A rapid deployment of renewable generation has led to significant reduction in the rotational system inertia and damping, thus making frequency control in power systems more challe…