Browsing NTNU Open by Author "Bergna-Diaz, Gilbert"
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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 ... -
Avoiding AC/DC grid interaction in MMC based MTDC Systems
Endegnanew, Atsede Gualu; Bergna-Diaz, Gilbert; Uhlen, Kjetil (Chapter, 2017)In this paper, the interaction between ac and dc grids is studied for two types of MMC control structures; conventional and non-conventional control structures. Linear analysis methods that are based mode shapes and ... -
Control of HVDC systems based on diode rectifier for offshore wind farm applications
ida, Flåten; Bergna-Diaz, Gilbert; Sanchez Acevedo, Santiago; Tedeschi, Elisabetta (Journal article; Peer reviewed, 2017)The transfer of energy from offshore wind farms using HVDC technology is highly dependant on the converter technology used. The conversion through HVDC has conventionally been done by Line Commutated Converters (LCC) or ... -
Control Strategies of a Converter-Fed Synchronous Machine for Variable Speed Hydropower
Stavnesli, Jørgen Hagset (Master thesis, 2020)Pumpekraftverk vert sett på som ei effektiv form for storskala energilagring, og har i long tid vore brukt for utjevning av forbruk og etterspørsel på dagsbasis. Framtidas kraftnett vil sjå eit auka behov for kontrollerbare ... -
Distributed Control and Optimization of DC Microgrids: A Port-Hamiltonian Approach
Abdolmaleki, Babak; Bergna-Diaz, Gilbert (Peer reviewed; Journal article, 2022)This article proposes a distributed secondary control scheme that drives a dc microgrid to an equilibrium point where the generators share optimal currents, and their voltages have a weighted average of nominal value. The ... -
Dynamics and Stability of Meshed Multiterminal HVDC Networks
Sanchez Acevedo, Santiago; Bergna-Diaz, Gilbert; Tedeschi, Elisabetta; Garces Ruiz, Alejandro (Journal article; Peer reviewed, 2018)This paper investigates the existence of an equilibrium point in multiterminal HVDC grids, assesses its uniqueness and defines conditions to ensure its stability. An offshore multiterminal HVDC system including two wind ... -
Energy Control of Complex Cyber-Physical Microgrids: Robustness against Cyber Attacks
Skaga, Cornelia (Master thesis, 2022)Denne masteroppgaven sammenfatter modellering og design av komplekse cyber-physical (CP) mikro-nettverk (MGs) som tidligere presentert i tilhørende prosjektoppgave. Port Hamiltonian teori er brukt i modelleringsprosessen, ... -
Energy-Based State-Space Representation of Modular Multilevel Converters with a Constant Equilibrium Point in Steady-State Operation
Bergna-Diaz, Gilbert; Suul, Jon Are Wold; D'Arco, Salvatore (Journal article; Peer reviewed, 2017)The internal currents and voltages of Modular Multilevel Converters (MMCs) contain multiple frequency components in steady state operation and remain time-periodic even when transformed into a synchronously rotating reference ... -
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 ... -
HVDC meshed multi-terminal networks for offshore wind farms: Dynamic model, load flow and equilibrium
Garces, Alejandro; Sanchez Acevedo, Santiago; Bergna-Diaz, Gilbert; Tedeschi, Elisabetta (Chapter, 2017)This paper presents sufficient conditions for the existence of an equilibrium point of multi-terminal HVDC (MT-HVDC) network for offshore applications. Newton's method is used both as a computational tool and as the basis ... -
Impedance computation for power electronic converters with Hilbert transform
Sanchez Acevedo, Santiago; Tedeschi, Elisabetta; Bergna-Diaz, Gilbert; D'Arco, Salvatore; Sanz, Marina (Chapter, 2017)The Hilbert transform (HT) is widely used in signal processing and it has been found as a good tool to understand some physical phenomena in electrical systems. This paper presents a methodology to derive the input impedance ... -
Interfacing Multi-Megawatt Offshore Wind Turbines with Modular Multilvel Converters.
Morozovska, Kataryna (Master thesis, 2015)The aim of the master thesis was to investigate the effect of Modular Multilevel Converter (MMC) on wind energy electrical system. In different literature sources MMC is used at the grid side of the turbine. This thesis ... -
Modular Multilevel Converter Control for HVDC Operation: Optimal Shaping of the Circulating Current Signal for Internal Energy Regulation
Bergna-Diaz, Gilbert (Doctoral thesis at NTNU;2015:143, Doctoral thesis, 2015)ELECTRICITY will most probably be the dominant form of energy in the upcoming future. Triggered by the decline of fossil fuels along with their elevated and volatile prices, the threat that they represent to national ... -
Networked Control of Complex Cyber-Physical DC Microgrids: On the Potential of Scalable Stability Features of PI Consensus Estimators
Folgerø, Kamilla Bakkane (Master thesis, 2023)Denne masteroppgaven bygger videre på arbeidet som ble utført i forbindelse med det tilhørende spesialiseringsprosjektet ved å fortsette på analysen av et cyber-fysisk DC mikronett som ble foreslått i en forskningsartikkel. ... -
On the Tuning of Fractional Order Resonant Controllers for a Voltage Source Converter in a Weak AC Grid Context
Haro-Larrode, Marta; Bergna-Diaz, Gilbert; Eguia, Pablo; Santos-Mugica, Maider (Peer reviewed; Journal article, 2021)This paper proposes a method for tuning the fractional exponent of different types of fractional order resonant controllers for a voltage source converter in a weak AC grid context. The main objective is to ensure the ... -
Optimal Shaping of the MMC Circulating Currents for Preventing AC-side Power Oscillations from Propagating into HVDC Grids
Bergna-Diaz, Gilbert; Suul, Jon Are Wold; Berne, Erik; Vannier, Jean-Claude; Molinas Cabrera, Maria Marta (Journal article; Peer reviewed, 2019)A constrained optimization problem based on the Lagrange multipliers method is formulated to derive the circulating current references of Modular Multilevel Converters (MMC) directly in abc coordinates. The resulting ... -
Overview of Consensus Protocol and Its Application to Microgrid Control
Ferreira, Daniele; Silva, Sidelmo; Silva, Waner; Brandao, Danilo; Bergna-Diaz, Gilbert; Tedeschi, Elisabetta (Peer reviewed; Journal article, 2022)Different control strategies for microgrid applications have been developed in the last decade. In order to enhance flexibility, scalability and reliability, special attention has been given to control organisations based ... -
Particle Swarm Optimization Tuning of Modular Multilevel Converters in a Time-Invariant Framework
Bergna-Diaz, Gilbert; Formentini, Andrea; Zanchetta, Pericle; Tedeschi, Elisabetta (Chapter, 2019)This work investigates the Particle Swarm Optimization (PSO) algorithm as a tool to tune the control parameters of a Modular Multilevel Converter (MMC) in a single-terminal HVdc configuration. More precisely, due to its ... -
PI Passivity-Based Control and Performance Analysis of MMC Multiterminal HVDC Systems
Bergna-Diaz, Gilbert; Zonetti, Daniele; Sanchez Acevedo, Santiago; Ortega, Romeo; Tedeschi, Elisabetta (Journal article; Peer reviewed, 2019)In this paper, a decentralized PI passivity-based controller is applied to modular multilevel converters to ensure global stability of a multiterminal high-voltage direct current system. For the derivation of the controller, ... -
PI Passivity-based Control of Modular Multilevel Converters for Multi-Terminal HVDC Systems
Bergna-Diaz, Gilbert; Zonetti, Daniele; Sanchez Acevedo, Santiago; Tedeschi, Elisabetta; Ortega, Romeo (Chapter, 2017)In this work, a decentralized PI passivity-based controller (PI-PBC) is applied to the Modular Multilevel Converters (MMCs) to ensure global asymptotic stability of a multiterminal MT-HVDC system. Since continuous MMC ...