http://repositorio.ufc.br/handle/riufc/474 2026-04-06T09:22:17Z http://repositorio.ufc.br/handle/riufc/68821 Título: Hybrid position controller for an indirect field-oriented induction motor drive Autor(es): Souza Júnior, Antônio Barbosa de; Fernandes Neto, Tobias Rafael; Honório, Dalton de Araújo; Diniz, Eber de Castro; Barreto, Luiz Henrique Silva Colado; Reis, Laurinda Lúcia Nogueira dos Abstract: This paper presents the study and implementation of a hybrid position controller for an indirect field-oriented induction motor drive. In order to improve the position tracking performance of an induction motor drive, a design procedure of a hybrid controller is developed based on the conventional Proportional (P) controller and the Generalized Predictive Control (GPC) controller. The fuzzy logic is utilized to achieve the hybridization between the P and GPC controllers. The P is adopted because its parameter values can be simple chosen with an aggressive tuning (fast response), while the GPC controller enhances the robustness and has a moderate controller action. Then, the position control loop is regulated with the hybrid controller, while the speed and currents loops incorporate PI (Proportional Integral) controllers. The proposed controller, simulations, implementation data, and test results with step, trapezoidal, triangular position profiles and step change in load, are given, discussed and verified. It is shown that the proposed position hybrid controller has a fast tracking capability to industrial robotics applications and it is robust to load disturbance. Tipo: Artigo de Evento 2015-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/68813 Título: Testing the influence of the quality of the supply voltage on the performance of a numerical relay Autor(es): Leão, Ruth Pastôra Saraiva; Colaço, Ana Lúcia Gondim; Melo, Nelber Ximenes; Almada, Janaína Barbosa; Azevedo, Robson Alencar; Sampaio, Raimundo Furtado; Barroso, Giovanni Cordeiro; Silveira, José Giordane Abstract: To ensure consistent reliability and proper operation, protective relay equipment must be evaluated and tested. This paper presents the requirements for testing the ac and d.c. auxiliary power supply of protective relays and the test results. The test severity levels, test set-up, test procedures and test report are presented according to the IEC60255-11 Ed.2.0. A numerical relay commonly found in the power distribution systems is used for testing. The tests are carried out to determine the ability of the relay to withstand a variety of disturbances as specified in the international standard. Tipo: Artigo de Evento 2010-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/68809 Título: Decentralised energy management system to virtual power plants Autor(es): Almada, Janaína Barbosa; Leão, Ruth Pastôra Saraiva; Lima, Carlos Felipe Parente; Rêgo, Marcos César Oliveira do; Antunes, Fernando Luiz Marcelo Abstract: This paper focuses on the steady-state analysis of location and control of distributed power generators encompassing a virtual power plant (VPP). The significant increase worldwide in distributed generation from renewable energy has been largely due to the concern with the environment, the grid access and the strong support policies for the promotion of renewable electricity. Deployment of distributed power plants has contributed to the new concept of VPP as a solution to handle the mix of conventional and distributed energy sources. Produced energy from even small scale generators will be utilized in energy markets and can contribute to the enhancement of the electrical power system. When aggregated, the group of DG would gain access and visibility across the energy markets and the system operation will benefit from optimal use of all available capacity and increased efficiency of operation. Tipo: Artigo de Evento 2010-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/68791 Título: Controllogger: A remote monitoring system for decentralized renewable energy sources Autor(es): Brito, Fábio Timbó; Jucá, Sandro César Silveira; Carvalho, Paulo Cesar Marques de Abstract: The development of a remote monitoring and control system for decentralized renewable energy plants is described in the present paper. The system has a microcontroller-based unit for local storing and data transmission to internet by a GSM modem and a database server to store the data. The proposed architecture is easily extended for controlling a decentralized renewable energy plant by a remote operator. Correlations and performance tests are used to compare the data collected by the system prototype with data collected by a commercial data acquisition system. The results indicate that the Root Mean Square Error (RMSE) is 0.103 m/s for the wind speed measurement and the correlation factor is greater than 0.9996. Overall, the low errors rates indicate that the data have been stored in a similar form to what would be expected with the use of a commercial data logger. Tipo: Artigo de Evento 2012-01-01T00:00:00Z