A5088147998- Microgrid Control and Optimization
- Smart Grid Energy Management
- HVDC Systems and Fault Protection
- Islanding Detection in Power Systems
- Optimal Power Flow Distribution
- Multilevel Inverters and Converters
- Power Quality and Harmonics
- Supercapacitor Materials and Fabrication
- Advanced DC-DC Converters
- Smart Grid Security and Resilience
- Advanced Battery Technologies Research
- Power System Optimization and Stability
- Electric Vehicles and Infrastructure
- Magnetic Properties and Applications
- Electromagnetic Compatibility and Noise Suppression
- Real-time simulation and control systems
- Frequency Control in Power Systems
- High-Voltage Power Transmission Systems
- Magnetic confinement fusion research
- Power Systems and Technologies
- Energy Harvesting in Wireless Networks
- Power System Reliability and Maintenance
- Superconducting Materials and Applications
- Electric Power Systems and Control
- Power Systems and Renewable Energy
Universidad de Sevilla
2016-2025
Eindhoven University of Technology
2022
This study presents and thoroughly compares different alternatives to create DC links in distribution networks by means of voltage source converters (VSC). Such give rise fully controllable loops nowadays radially operated systems, allowing higher levels distributed generation penetration. Suitable VSC-based devices are reviewed compared from several points view, including topologies, degrees freedom, operating ranges performance. Several case studies, involving actual urban rural networks,...
The growing penetration of converter-interfaced distributed renewable energy sources (CI-DRES) has posed several challenges into the electric power systems, e.g., instability caused by intermittent nature primary sources, quality issues, etc. Several algorithms have been proposed to mitigate CI-DRES fluctuations and reduce high active ramp-rates (RRs) at point common coupling (PCC) with grid using storage systems (ESS). However, these present some drawbacks. In this article, a new ramp-rate...
A new spherical tokamak, the SMall Aspect Ratio Tokamak (SMART), is currently being designed at University of Seville. The goal machine to achieve a toroidal field 1 T, plasma current 500 kA and pulse length ms for with major radius 0.4 m minor 0.25 m. This contribution presents design coils power supplies machine. foresees central solenoid, 12 8 poloidal coils. Taking waveforms these set as starting point, each them has been withstand Joule heating during tokamak operation time. An...
This paper analyzes the feasibility and convenience of applying efficient discrete Fourier transform (DFT) techniques for computation reference currents in active power filters. Existing methods designed this purpose rely on a high-pass filter order to obtain harmonic components load current be filtered. Among these methods, stationary frame (SRF) method reveals itself as most accurate one because its inherent immunity distorted voltage conditions. In paper, two different implementations...
Today's electricity paradigm requires that the notion of active distribution systems be introduced at both undergraduate and graduate curricula. This involves not only customary theoretical foundations but also a suitable power engineering laboratory, where flexible enough affordable resources allow students researchers to carry out hands-on experiments reinforcing concepts explained in classroom. paper describes smart grid laboratory Power Engineering Group University Seville, composed...
Voltage source converters are presented as the key devices for future massive integration of distributed renewable energy resources in network. This article presents a novel approach to control three-phase four-leg voltage converter grid-forming operation. The objective controller is generate balanced with given amplitude and frequency at point common coupling. proposed algorithm works over stationary axes. It based on full state feedback law combination resonant loop tuned fundamental order...
The ever-growing penetration of Converter-Interfaced Renewable Energy Sources (CI-RES) and the gradual decommission synchronous generators (SGs) are posing several challenges to guarantee stability robustness electric power system. A possible solution overcome foreseen problems is enable provision ancillary services (AS) by advanced CI-RES emulating SG performance. However, given fact that most operate at maximum point, it will be required rely on energy storage systems (ESS) deal with...
DC Links are proposed in the literature as a mean to enhance system performance and facilitate integration of dispersed generators distribution grids. Their operation relies on centralized controller which gathers measurements acquired along network compute their adequate set points. This architecture provides several technical benefits but strongly depends communication infrastructures (meters, data concentrators, etc.) may fail. When this happens links not work properly, even forcing...
The smart-grid era is characterized by a progressive penetration of distributed energy resources into the power systems. To ensure safe operation system, it necessary to evaluate interactions that those devices and their associated control algorithms have between themselves pre-existing network. In this regard, Hardware-in-the-Loop (HIL) testing approaches are step before integrating new actual However, HIL device-oriented approach with some limitations, particularly considering possible...
The massive integration of distributed energy resources is strongly linked to the development voltage source converters responsible for connecting them grid. These will have provide a series services that facilitate their into future distribution network. Among them, it important highlight need improve wave quality voltages which can be distorted by increase nonlinear and unbalanced loads in system. This paper presents control strategy grid-forming converter able compensate harmonics...
The increased penetration of Distributed Renewable Energy Sources (DRES) has posed several challenges into the electric power systems, most important which is instability caused by intermittent and stochastic nature primary sources (wind, sun). Since System Operators have started to specify limits for restriction Ramp-Rate (RR) at Point Common Coupling (PCC) DRES with grid, algorithms been proposed mitigate fluctuations using energy storage systems (ESS). Some drawbacks are: high...
This study presents the dynamic modelling and proposes two control strategies for an AC-link shunt-series power flow controller (ShSPFC) based on a class of matrix converter termed vector switching (VeSC). topology is intended regulating between buses in system by synthesising adjustable voltage inserted series to transmission line. The includes principle operation this detailed abc dq coordinates. Based model are proposed: (i) classical proportional integral (PI) approach (ii) alternative...
The ever-growing penetration of Converter-Interfaced Distributed Renewable Energy Sources (CI-DRES) and the gradual decommission synchronous generators (SGs) has posed several challenges related to stability robustness electric power systems. Since main interface CI-DRES with grid are Voltage Source Converters (VSCs), there been a major shift in VSC control philosophy, where absence SGs is compensated by Ancillary Services (ASs) provided new generation CI-DRES. In order make these ASs...
This paper assesses the behaviour of active distribution networks with high penetration renewable energy sources when control is performed in a centralised manner. The assets are on-load tap changers transformers at primary substation, reactive power injections sources, and exchanged between adjacent feeders they interconnected through DC link. A scaled-down network used as testbed to emulate an system massive resources. laboratory involves hardware devices, real-time control, communication...
In the last decade, distribution systems are experiencing a drastic transformation with advent of new technologies. fact, networks no longer passive systems, considering current integration rates agents such as distributed generation, electrical vehicles and energy storage, which greatly influencing way these operated. addition, intrinsic DC nature components, interfaced to AC system through power electronics converters, is unlocking possibility for topologies based on AC/DC networks. This...
This paper proposes a new reference frame, namely Reduced Reference Frame (RRF), specially suited for unbalanced three–phase four–wire systems which improves the performance of classical Fortescue, Clarke and Park transformations. The RRF transfomation allows to represent any sinusoidal magnitude with just two components even if zero–sequence component is present. For doing so, transformation takes into account that <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The massive penetration of electric vehicles may create local problems on the LV distribution systems where charging stations are located. Most solutions proposed in specialized literature based centrilized algorithms which applied to traditional systems. This paper proposes a new station multiterminal DC-link. infrastructure, flexible link between radial feeders, allows maximizing use current assets and optimizing network operation by an equalization involved MV/LV transformers.
The massive integration of distributed renewable energy resources is a reality in the current power system. In this new context with greater volatility on generation side it required to incorporate assets provide additional flexibility system accommodate as much possible. Among these assets, DC or AC flexible links could play key role managing flows within radial distribution systems. These connected between feeders may regulate active flow controlled manner and contribute network voltage...
The high penetration of renewable energy sources (RES) interfaced with power electronics along the increase non-linear loads may create quality problems in distribution systems. Harmonics can be mitigated by applying active filtering techniques using a virtual impedance technique and set resonant controllers tuned to specific harmonics compensated. However, these do not usually consider thermal limits converters, especially those based on approach. contribution this paper relies adjusting...
The increasing penetration of renewable energy sources is strongly linked to the development voltage source converters used in their connection grid. As a result, near future an inverter-dominated power system it will be requirement for generation provide ancillary services order compensate absence synchronous generation. In this scenario, use storage systems along with advanced control algorithms mimicking dynamic behaviour traditional generators utmost importance. This paper deals...