Encontrados 10 documentos, a visualizar página 1 de 1
Single-Phase Induction Motor Controller For Photovoltaic Powered Water Pump
Foito, Daniel; Guerreiro, M.; Pires, V. FernãoCom o apoio RAADRI. ; The objective of this paper is to present a centrifugal pump control system driven by a single-phase induction motor (SPIM) that is supplied by a photovoltaic generator. The study system consists of a PV array, a DC/DC converter, a DC/AC converter and a single-phase AC motor. The DC/DC converter is controlled in order to ensure the maximum power of the PV array. For the maximum power poin...
A Neuro-Fuzzy Based System for Fault Detection and Diagnosis of 3-Phase PFC Rec...
Foito, Daniel; Pires, V. Fernão; Amaral, T. G.; Martins, J. F.Com o apoio RAADRI. ; Fault diagnosis in PFC rectifiers is becoming more and more important in many industrial applications. PFC rectifiers allow high power factor operation in AC/DC conversion. This power converter is normally the first interface between the ac power system network and the electronic equipment. In this way a good diagnosis system can avoid unplanned standstill. Under this context, this work p...
Implementation of a low cost data acquisition board for photovoltaic arrays ana...
Sousa, Sérgio; Onofre, Maicon; Antunes, Tiago; Branco, Cláudio; Maia, José; Inacio-Rocha, Jose; Pires, V. FernãoTesting PV modules are one of the important procedures to ensure the conformity with the standards and quality of this equipment’s. To implement some of the PV modules tests a data acquisition system is required. This paper presents the design and implementation of a data acquisition system for photovoltaic systems. The developed system is characterized by a low cost board based on a microcontroller. The descri...
Road Motion Control Electric Vehicle with Speed and Torque Observer
Foito, Daniel; Gaspar, Manuel; Pires, V. FernãoThis paper presents an electric vehicle (EV) with two independent rear wheel drives and with an electric differential system. A model of the vehicle dynamic model is presented. The electric differential was implemented assuring that, in straight right trajectory, the two wheels drives roll exactly at same velocity and, in curve, the difference between the two velocities assure a vehicle trajectory. A speed and ...
A Control Structure for a Photovoltaic Supply System with Power Compensation Ch...
Pires, V. Fernão; Martins, J. F.; Silva, J. FernandoCom o apoio RAADRI. ; A system controller for a three-phase gridconnected inverter for photovoltaic applications is presented. The active and reactive currents will both be controlled in order to realize active power supply and reactive power compensation. The three-phase inverter will be controlled by a fast and robust sliding mode controller. The active and reactive current references will be calculated in o...
A computer-based testing system to evaluate protective relays as a tool in powe...
Martins, L. Sousa; Fortunato, Carlos; Pires, V. FernãoTeaching power system relaying is a fundamental issue in a power system high-level course. However, for an effective instruction of this topic an experience with real equipments can be considered as fundamental. To achieve this purpose, in this paper a new approach for the practical learning of power system relaying is presented. This consists of a computer-based testing system of relay-operating characteristic...
Current differential line protection using a pattern recognition method
Pires, V. Fernão; Fortunato, CarlosThis paper presents a new approach to a numerical current differential protection for the transmission lines. The current differential algorithm uses a pattern recognition method. First the acquired current signals are transformed into “dqo” components by applying the Park transformation. The transformed currents will originate typical patterns according the fault type. Using a pattern recognition algorithm the...
Transmission lines protection based on the current eigenvalues differential con...
Pires, V. Fernão; Guerreiro, M.; Fortunato, Carlos; Martins, L. SousaThis work presents a new approach for a current differential protection of the transmission lines. The proposed approach is based on the Clarke-Concordia transformation and principal component analysis. First the acquired current signals are transformed into “αβo” components by applying the Clarke-Concordia transformation. This allows obtaining typical patterns. To identify these patterns a principal component ...
A current differential line protection using a synchronous reference frame appr...
Martins, L. Sousa; Fortunato, Carlos; Pires, V. FernãoThis paper presents a new approach for a current differential protection of the transmission lines. This approach is based on the Park transformation or ABC-dqo transformation. Using the ABC-dqo transformation the three phase quantities are transformed into a synchronous rotating reference frame. In this way, the line currents of the three phase system are measured and transformed into three dc components. So, ...
A power amplifier system for testing of distance relay operating characteristic
Marçal, Rui; Rodrigues, Ricardo; Fortunato, Carlos; Martins, L. Sousa; Pires, V. FernãoThis paper describes a power amplifier system for testing of distance relay operating characteristic. This power amplifier is based on two three phase inverters with a neutral wire. The output power currents and voltages are controlled by a sliding mode controller. A developed matlab/simulink digital simulator generates the test signals. This test signals are converted in current and voltage references using a ...
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