A new methodology called dice game optimizer for capacitor placement in distribution systems

Purpose. Shunt capacitors are installed in power system for compensating reactive power. Therefore, feeder capacity releases, voltage profile improves and power loss reduces. However, determination optimal location and size of capacitors in distributionsystems is a complex optimization problem. In order to determine the optimum size and location of the capacitor, an objective function which is generally defined based on capacitor installation costs and power losses should be minimized According to operational limitations. This paper offers a newly developed metaheuristic technique, named dice game optimizerto determine optimal size and location of capacitors in a distribution network. Dice game optimizer is a game based optimization technique that is based on the rules of the dice game.Цель. Шунтирующие конденсаторы в энергосистеме устанавливаются для компенсации реактивной мощности. Следовательно, снижается емкость фидера, улучшается профиль напряжения и снижаются потери мощности. Однако определение оптимального местоположения и размера конденсаторов в системах распределения является сложной задачей оптимизации. Чтобы определить оптимальный размер и расположение конденсатора, целевую функцию, которая обычно определяется на основе затрат на установку конденсатора и потерь мощности, следует минимизировать в соответствии с эксплуатационными ограничениями. Данная статья предлагает недавно разработанный метаэвристический метод, называемый оптимизатором игры в кости, для определения оптимального размера и расположения конденсаторов в распределительной сети. Оптимизатор игры в кости – это игровой метод оптимизации, основанный на правилах игры в кости

Nos vemos en la calle, del documento al documental etnográfico

"Nos vemos en la calle" es un documento audiovisual que forma parte de un proyecto de investigación sobre agrupaciones ilegales o callejeras del Carnaval de Cádiz. La elaboración de un documento en soporte audiovisual se concebía, en origen, como complemento de una propuesta más amplia que culminaba en la ejecución de un informe analítico-descriptivo sobre el tema de estudio, considerando el registro audiovisual como una importante aportación documental a la investigación etnográfica. Esta premisa condicionó de manera fundamental el proceso de producción de la película y sus resultados. El posterior desarrollo del trabajo de realización del documental en sí mismo y las dimensiones que éste fue adquiriendo, como forma de conocimiento y expresión propia, han modificado la "naturaleza primera" de este material, adquiriendo autonomía (aunque siempre vinculada al contexto de la investigación), convirtiéndose en algo más que un método de registro y material audiovisual del tema de estudio con mero valor documental para su posterior análisis

A Harmonic-based Fault detection algorithm for Microgrids

The trend toward Microgrids (MGs) is significantly increasing by employing Distributed Generators (DGs) which leads to new challenges, especially in the fault detection. This paper proposes an algorithm based on the Total Harmonic Distortion (THD) of the grid voltages to detect the events of faults in MGs. The algorithm uses the THD together with the estimate amplitude voltages and the zero-sequence component for the detection and identification of the faults. The performance is evaluated by using MATLAB/Simulink simulations to validate the capability for detecting different fault types in the least possible time.Comment: Proc. of the Interdisciplinary Conference on Mechanics, Computers and Electrics (ICMECE 2022) 6-7 October 2022, Barcelona, Spai

Plan de gestión de redacción de proyectos : estudio de caso

[ES] Este Trabajo Fin de Grado trata de desarrollar cómo se lleva a cabo el diseño de proyectos en una oficina técnica en cualquier parte del mundo. Se ha realizado un proyecto de gestión sobre la puesta en valor de unas cuevas que engloba la planificación, la organización, el control y la dirección. Este trabajo es una simulación en que se asumen las atribuciones del responsable del proyecto, quien debe demostrar a la dirección de empresa cuáles son las necesidades en relación a recursos humanos, recursos económicos y materiales, así como cuál es la previsión temporal, planificando las fases y tareas. También se deben exponer las acciones preventivas ante los posibles riesgos que puedan acontecer. Este trabajo se ha planteado a modo de un manual que explique cómo se organiza la redacción de un proyecto con un gran nivel de detalle.[EN] This Bachelor's Thesis intends on explaining how to carry out a project design in a project management office anywhere in the world. A management project about the conservation of some caves has been performed. This project comprises the areas of planning, organisation, project control, information and direction/leadership.This paper shows the project manager duties, who must estimate the firm's investments in human, economic and material resources. Labor time control and risk analysis are also important activities in order to achieve a successful closure of the project. This work is a handbook explaining how to draft a project with a great level of detailGhadban Guerrero, SA. (2015). Plan de gestión de redacción de proyectos : estudio de caso. http://hdl.handle.net/10251/60547TFG

A comparative study of smart THD-based fault protection techniques for distribution networks

The 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 problems for protection schemes. This poses a threat to conventional strategies because the relay settings have to be adjusted depending on the network topology and operational mode. As a solution, it is important to develop novel fault protection techniques to ensure reliable protection and avoid unnecessary tripping. In this regard, Total Harmonic Distortion (THD) can be used as a key parameter for evaluating the grid’s waveform quality during fault events. This paper presents a comparison between two DS protection strategies that employ THD levels, estimated amplitude voltages, and zero-sequence components as instantaneous indicators during the faults that function as a kind of fault sensor to detect, identify, and isolate faults. The first method uses a Multiple Second Order Generalized Integrator (MSOGI) to obtain the estimated variables, whereas the second method uses a single SOGI for the same purpose (SOGI-THD). Both methods rely on communication lines between protective devices (PDs) to facilitate coordinated protection. The effectiveness of these methods is assessed by using simulations in MATLAB/Simulink considering various factors such as different types of faults and DG penetrations, different fault resistances and fault locations in the proposed network. Moreover, the performance of these methods is compared with conventional overcurrent and differential protections. The results show that the SOGI-THD method is highly effective in detecting and isolating faults with a time interval of 6–8.5 ms using only three SOGIs while requiring only 447 processor cycles for execution. In comparison to other protection methods, the SOGI-THD method exhibits a faster response time and a lower computational burden. Furthermore, the SOGI-THD method is robust to harmonic distortion, as it considers pre-existing harmonic content before the fault and avoids interference with the fault detection process.Peer ReviewedPostprint (published version

Cooperative Control of Multi-Master-Slave Islanded Microgrid with Power Quality Enhancement Based on Conservative Power Theory

Made available in DSpace on 2018-11-26T16:04:54Z (GMT). No. of bitstreams: 0 Previous issue date: 2018-07-01Cooperative control of power converters in a microgrid offers power quality enhancement at sensitive load buses. Such cooperation is particularly important in the presence of reactive, nonlinear, and unbalanced loads. In this paper, a multi-master-slave-based control of distributed generators interface converters in a three-phase four-wire islanded microgrid using the conservative power theory (CPT) is proposed. Inverters located in close proximity operate as a group in master- salve mode. Slaves inject the available energy and compensate selectively unwanted current components of local loads with the secondary effect of having enhanced voltage waveforms while masters share the remaining load power autonomously with distant groups using frequency droop. The close proximity makes it practical for control signals to be communicated between inverters in one group with the potential to provide rapid load sharing response for mitigation of undesirable current components. Since each primary source has its own constraints, a supervisory control is considered for each group to determine convenient sharing factors. The CPT decompositions provide decoupled current and power references in abc-frame, resulting in a selective control strategy able to share each current component with desired percentage among the microgrid inverters. Simulation results are presented to demonstrate the effectiveness of the proposed method.Colorado Sch Mines, Dept EECS, Golden, CO 80401 USAAalborg Univ, Dept Energy Technol, DK-9220 Aalborg, DenmarkPetr Inst, Dept Elect Engn, Abu Dhabi 2533, U Arab Emirate