Browsing by Author "Matas Alcalá, José"
Now showing items 1-20 of 56
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A comparative study of smart THD-based fault protection techniques for distribution networks
(2023-05-01)
Article
Open AccessThe integration of Distributed Generators (DGs) into distribution systems (DSs) leads to more reliable and efficient power delivery for customers. However, the possibility of bi-directional power flow creates new technical ... -
A comprehensive model for the design of a microgrid under regulatory constraints using synthetical data generation and stochastic optimization
(2020-10-26)
Article
Open AccessAs renewable energy installation costs decrease and environmentally-friendly policies are progressively applied in many countries, distributed generation has emerged as the new archetype of energy generation and distribution. ... -
A distributed real-time power management scheme for shipboard zonal multi-microgrid system
(2022-07-01)
Article
Open AccessThe increasing demands of reducing fuel consumption for marine transportation have motivated the use of high fuel efficiency power plants and the development of power management systems (PMS). Current studies on shipboard ... -
A family of gradient descent grid frequency estimators for the SOGI filter
(2017-09-04)
Article
Restricted access - publisher's policyThis paper applies the adaptive gradient descent method to the second-order generalized integrator (SOGI) filter in order to find an online estimation algorithm for the grid frequency, which leads to the proposal of three ... -
A fast power calculation algorithm for three-phase droop-controlled-inverters using combined SOGI filters and considering nonlinear loads
(2022-10-07)
Article
Open AccessThe power calculation is an indispensable element in droop-controlled inverters because the bandwidth of the measured power has a direct impact on the controller performance. This paper proposes a fast and accurate power ... -
A new "doctor and patient" optimization algorithm: An application to energy commitment problem
(MDPI, 2020-08-21)
Article
Open AccessRegular assessments of events taking place around the globe can be a conduit for the development of new ideas, contributing to the research world. In this study, the authors present a new optimization algorithm named doctor ... -
A new LPF-based grid frequency estimation for the SOGI filter with improved harmonic rejection
(2018)
Conference lecture
Open AccessThis paper proposes a new method for the estimation of the grid voltage frequency using a low-pass filter (LPF) approach. The estimated frequency is used to tune a second order generalized integrator (SOGI) filter commonly ... -
A new THD measurement method with small computational burden using a SOGI-FLL grid monitoring system
(Institute of Electrical and Electronics Engineers (IEEE), 2020-06-01)
Article
Open AccessThis article proposes a new method for obtaining the total harmonic distortion (THD) using few math operations, a low-pass filter (LPF), and a grid monitoring system able to provide the fundamental and harmonics components ... -
A power calculation algorithm for single-phase droop-operated-inverters considering linear and nonlinear loads HIL-assessed
(2019-11-01)
Article
Open AccessThe active and reactive powers, P and Q, are crucial variables in the parallel operation of single-phase inverters using the droop method, introducing proportional droops in the inverter output frequency and voltage amplitude ... -
A robust THD based communication-less protection method for electrical grids with DGs
(Elsevier, 2024-01-01)
Article
Open AccessIn this paper, a protection method with two cascaded algorithms is proposed to face fault events in Electrical Distribution Systems (EDSs). The first algorithm uses the Total Harmonic Distortion (THD), the estimates of the ... -
A THD-based fault protection method using MSOGI-FLL grid voltage estimator
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-01-14)
Article
Open AccessThe rapid growth of the distributed generators (DGs) integration into the distribution systems (DSs) creates new technical issues; conventional relay settings need to be updated depending on the network topology and ... -
Active damping control for a three phase grid-connected inverter using sliding mode control
(2013)
Conference report
Restricted access - publisher's policyThis paper proposes a ne w active damping method based on virtual resistors for three-phase grid connected voltage source inverters (VSI) with LCL filter. The use of this filters is a standard solution to provide the ... -
Advanced synchronization control for inverters parallel operation in microgrids using coupled Hopf oscillators
(2020-09)
Article
Open AccessA simple high-performance decentralized controller based on Hopf oscillator is proposed for three-phase parallel voltage source inverter (VSI) in islanded Microgrid. In aß frame, the oscillators equations corresponding ... -
An adaptive prefiltering method to improve the speed/accuracy tradeoff of voltage sequence detection methods under adverse grid conditions
(Institute of Electrical and Electronics Engineers (IEEE), 2013-07-23)
Article
Restricted access - publisher's policyThis paper deals with the improvement of the transient response and harmonic, subharmonic, and dc-offset voltage rejection capability of a grid voltage sequence detection scheme based on a second-order generalized integrator ... -
Analysis of the net metering schemes for PV self-consumption in Denmark
(2021-04-03)
Article
Open AccessThe current Danish regulatory framework BEK 999/2016 for hourly net settled new PV facilities is analysed in detail, evaluating the technical and economic differences between the several envisioned schemes. In addition to ... -
Assessing the 2014 retroactive regulatory framework applied to the concentrating solar power systems in Spain
(2018-02-15)
Article
Open AccessThe RD 413/2014 new economic and regulatory framework applied to the concentrating solar power plants (CSPP) in Spain has been here analysed and its new remuneration scheme has been formulated, becoming evident its high ... -
Comparison between different droop based control techniques and a virtual control oscillator
(2023-03-15)
Article
Open AccessThis work presents a literature review about control techniques for parallel connected power inverters under microgrid applications. Some control strategies, based on droop control for parallel inverters of distributed ... -
Control design for multiphase synchronous buck converters based on exact constant resistive output impedance
(Institute of Electrical and Electronics Engineers (IEEE), 2013-11)
Article
Restricted access - publisher's policyThis paper describes a control design methodology based on output impedance analysis for multiphase synchronous buck converters. This design leads to an optimal output voltage transient response. Two design alternatives ... -
Control scheme for photovoltaic three-phase inverters to minimize peak currents during unbalanced grid-voltage sags
(2012)
Article
Restricted access - publisher's policyNowadays, the majority of the photovoltaic (PV) power sources are connected to the public grid. One of the main connection problems occurs when voltage sags appear in the grid due to short circuits, lightning, etc. ...
