Navegando por Assunto "Sistema de controle digital"

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Acesso aberto (Open Access)
Controle Fuzzy aplicado à melhoria da estabilidade dinâmica em sistemas elétricos de potência
(2005-06) BARRA JUNIOR, Walter; BARREIROS, José Augusto Lima; COSTA JÚNIOR, Carlos Tavares da; FERREIRA, André Maurício Damasceno
This work presents a fuzzy control strategy which can be applied to improve the dynamic stability of electric power systems. The gains of fuzzy controller are smoothly adjusted by using interpolation among the gains of a set of previously designed local controllers, according to the current plant operating condition. In this way, the parameters of the fuzzy controller are automatically adjusted on-line, in order to cope with changes in the power system operating conditions. The performance of the fuzzy strategy was assessed by simulation studies, using a nonlinear machine infinite bus bar dynamic model. The results show that it is possible to improve the power system dynamic performance under time-variable operating conditions.in english. Please notice that the abstract in english comes first.
Acesso aberto (Open Access)
Estabilizador de sistemas de potência digital aplicado a uma unidade geradora da UHE de Tucuruí
(2011-10) NOGUEIRA, Fabrício Gonzalez; BARRA JUNIOR, Walter; COSTA JÚNIOR, Carlos Tavares da; BARREIROS, José Augusto Lima; NASCIMENTO FILHO, Paulo Sergio; MORAES, Anderson Roberto Barbosa de; GOMES, Marcus Ciro Martins; LANA, Jânio José de
This paper presents the development and results of field tests of a digital power system stabilizer (PSS), designed for the damping of electromechanical oscillations in interconnected systems. Experimental tests were performed in a 350 MVA hydrogenerator unit, of the Tucurui Power Plant. The PSS damper control law was embedded in a digital hardware system based on a digital signal controller (DSPIC 30f5011). The structure of the control law is in discrete time RST canonical form, and the controller parameters were calculated using the pole shifting technique. For purposes of the controller design, the dynamics of the plant, in the considered operating point, was represented by a parametric model, which was estimated from data measured in the field. The experimental results showed an excellent performance of the damping of electromechanical modes observable UHE Tucurui by digital PSS.
Acesso aberto (Open Access)
Implementação e testes de campo de um ESP digital
(Universidade Federal do Pará, 2010-05-18) GOMES, Marcus Ciro Martins; BARREIROS, José Augusto Lima; http://lattes.cnpq.br/1246564618922453; BARRA JUNIOR, Walter; http://lattes.cnpq.br/0492699174212608
This work presents the development and implementation as well as the results of field tests of a power system stabilizer (PSS) designed with digital control method for damping electromechanical modes of oscillation observed for signs of electrical power measured in a generating unit of 350 MVA of Tucuruí power plant. It is presented and applied the methodology of identifying linear parametric models such as auto regressive with exogenous inputs (ARX) for estimation of models with the ability to capture the relevant information (natural frequency and damping) of dominant electromechanical modes of the system. In possession of ARX parametric model is done then the synthesis of digital damper control law for the ESP, using the technique of pole displacement of the closed loop transfer function. For the synthesis of digital control law, we used a canonical structure type RST. For the field tests, the control law digital ESP buffer was coded in C language and embedded in a hardware prototype of which is based on model DSPIC 30F3014 microcontroller, which incorporates a large number of peripherals for data acquisition and communication. In order to evaluate the performance of the digital PSS developed, experimental tests were performed in a generating unit of 350 MVA power house number 1 from Tucuruí power plant. The stabilizer acts carried out by adjusting the reference voltage regulator automatic voltage of the respective generating unit in accordance with the oscillations observed by measuring the electrical power generator stator. The results of field tests showed an excellent performance of ESP digital damping of electromechanical mode of natural frequency of approximately 1.7 Hz, observed in the field trial.