Browsing by Issue Date, starting with "2015-05-27"
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- Reconfigurable power quality analyserPublication . Fazendeiro, João Fernando de Aguiar; Figueiredo, Mónica Jorge Carvalho de; Oliveira, Filipe Tadeu SoaresElectronic power supplies are found in almost all electrical equipment. They are sensitive to power quality disturbances but they themselves are causers of interference. This becomes more prominent with their wider use which means that these disturbances have a tendency to aggravate in future. One of the results will be that additional losses will occur and end-users will also be penalised for it by paying more. There is a need to revert this tendency also in an effort to help lower pollution. Another consequence of disturbances is the added difficulty that power grid operators will have to maintain the network stable. Everyone would therefore benefit from more efficient electricity consumption. A power quality disturbance can be measured with a power quality analyser to help the technician find its cause. This is the first step to finding a solution to resolve the disturbance. The objective of this project was to implement digital signal processing algorithms on a FPGA for the analysis of power quality disturbances. The motive for choosing the FPGA was that it allowed a processor, used for lower demanding processing tasks, and dedicated hardware, used for time-critical operations, to be integrated into a single integrated circuit. The implementation of these algorithms in dedicated hardware permitted obtaining high-resolution measurements and the exploitation of parallelism to increase the quantity of information available to the user. The FPGA is a versatile component, ideal to implement the reconfigurable power quality analyser that is upgradable in future. The project resulted in the successful measurement of the fundamental frequency and the magnitude of the signal at the input. The device was able to detect and measure harmonic and inter-harmonic components. Positive and negative peak values were measured and the root mean square value both for full-cycle and half-cycle were calculated making stationary signal variation evaluation possible. Time aggregation of values was also done. The generation of an internal signal made it possible for the comparison with the input signal, resulting in event isolation for further verification and classification by the controller.
- Electronic interface board to monitor and control CERN´s sputter ion pumpPublication . Roda, Marco André Felício; Mendes, Luís Miguel Moreira; Faria, Sergio Manuel MacielThis report presents the work developed during the master internship at the European Organization for Nuclear Research (CERN). The described work resulted from two initial objectives: improvement of the control system of vacuum sectors and the development of a new Pro bus-DP intelligent slave interface board for sputter ion pump controllers. Since the objectives were distinct, the work was split into two di erent projects. In the rst project, the control system for vacuum sectors of Large Hadron Collider, Super Proton Synchrotron and Complex Proton Synchrotron was improved. A new control rmware based in VHDL was developed, tested and upgraded for the control cards. The second project presented in this report involved the development of an electronic card for sputter ion pump controllers. Currently, the communication between the Pro bus network and the ion pump controllers is performed by a remote input-output station based on the ET200 module from Siemens. The operation and status information of the ion pumps and their controllers provided to the network are limited since the remote input-output station does not acquire all the available signals. Moreover, the physical connections between the remote input-output station and each ion pump controller is done with a dedicated cable, which is prone to connection malfunctions. In order to reduce the complexity, improve the signal integrity and upgrade the monitoring and control of the ion pumps system, a new Pro bus-DP intelligent slave interface was developed. It aims to provide direct Pro bus connection to the ion pump controller and to give to the Pro bus master access to all its control signals, improving the controllers usability and exibility. In this report, the card topology, its internal modules, the rmware, the LabVIEW application and assessment tests are presented and described.
- SGTC: sistema de gestão técnica centralizadaPublication . Cipriano, Ruben Tomás Camilo; Ribeiro, Eliseu Manuel Artilheiro; Dias, Luís; Jorge, FernandoO presente relatório surge na sequência do trabalho desenvolvido, durante um período de estágio, efetuado na empresa Jorinstel em conjunto com a Domebus no âmbito da implementação de um sistema de gestão técnica centralizada num edifício multifuncional na zona de Fátima. A Jorinstel é uma empresa da área das instalações elétricas, concebendo toda a eletrificação dos equipamentos do sistema, assim como a eletrificação dos respetivos quadros elétricos. A Domebus é uma empresa dedicada à programação e comercialização de Sistemas de Gestão Técnica Centralizada (SGTC) com tecnologia Distech Controls, e à integração dos vários equipamentos existentes no edifício de forma a criar um controlo estável, eficiente e apelativo ao utilizador apresentando interfaces gráficas de acordo com o sistema implementado. Foi tida sempre uma participação ativa em todas as atividades desenvolvidas na empresa, conseguindo-se assim estar sempre a par das inovações tecnológicas e aprofundar os conhecimentos adquiridos durante o percurso académico de uma forma prática. As ações, efetuadas durante o estágio, incidiram-se, numa primeira fase, em obter informação dos tipos de equipamentos instalados num sistema de gestão técnica, contendo os equipamentos de Aquecimento, Ventilação e Ar Condicionado, assim como todos os constituintes destes equipamentos. Numa segunda fase foi calculada a distribuição dos módulos de controlo da Distech Controls de acordo com os equipamentos apresentados em projeto de execução. Por fim numa terceira e última fase foi elaborada uma programação dos módulos controladores e realização do ambiente gráfico para a interação do utlizado.