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This article describes the development of a R&D project of a distribution transformer with integrated electricity measuring system. The system has as main objective the energy measurement of the transformers customer consumption and offers various information related to electrical distribution network to the utility and informs in real time the occurrence of any event. This R&D project was...
In this paper, the formulation of a stochastic model and its subsequent incorporation into a predictive control of a balls mill grinding circuit, is presented. The apparition of stochastic variables is a consequence of variables interaction by which is impossible to know a well-defined determinist mathematical methodology. Thus, the perceived dynamics is simulated by emphasizing those possible scenarios...
This work presents an electronic system in order to provide a simplified and efficient alternative for plants physiology experiment as well as for its utilization in greenhouses. Initially, it is shown a brief description regarding the artificial lighting and plants cultivation interaction, aiming the interpretation about plants behavior in botanic studies and to help the oriented and commercial crops...
This paper has as aim to present a comparative study between the classic power capacitors model implemented in the software dedicated to power quality analysis and the real power capacitors response tested in a controlled laboratory environment. This classic model is composed by a resistance connected in series with a capacitive element and is not sensitive to harmonic distortion. MATLAB — Simulink...
The primary sources of renewable energies such as sun and wind are intermittent. Therefore, the electricity provided by these sources can compromise stability and reliability of the electric system when operating at the interconnected mode. These sources are often underutilized or they stay idle when used in stand-alone systems and in periods of low demand. The use of energy storage in conjunction...
Motivated by the need of testing control strategies, where students can observe the importance of practical test in control theories, and the high price of testing platforms, this study target the classic inverted pendulum control system construction and implementation using wasted components from printers and hard drives, electronic components and an open source microcontroller, resulting in a low...
Remote microgrids are a viable option for electrification where the main grid expansion is either impossible or not economical. Typically, remote microgrid consists of diesel generator as a primary source of energy which has a high fuel cost. Renewable energy sources can be used to reduce the fuel consumption with proper coordination and scheduling methods. Storage devices, usually battery, used in...
This article presents a methodology for detection of high impedance faults (HIF). HIF occurs when e.g. a cable makes contact with objects of high electric resistance, resulting in a nonsignificant increase in current. Such faults cannot be detected by traditional protection devices that operate due to overcurrent. The developed methodology is based on making use of variables from a power quality meter...
Flywheel systems are attractive in hybrid and electric vehicles due to their ability to handle power during acceleration and braking. The combination of a flywheel device with a battery source has several advantages such as high peak power capacity, high energy density and reduction of the number of charge/discharge cycles of the battery. The novelty of the system in development at the Uppsala University...
Reliable frequency estimation is considered crucial for several industrial applications, such as power control, power system protection and monitoring. In certain applications is required an accurate and fast frequency estimations of the sinusoidal signals. Several algorithms are found in literature able to solve this task. However, their responses under low Signal to Noise Ratio (SNR) are not reliable...
This paper presents the model and the control of the rotor current loop a double-fed induction generator based on a robust generalized predictive controller. The controller is designed to minimize the control signal and ensure the reference tracking quickly and with a minimum of overshoot. Furthermore, it is proposed a new methodology for controller tuning based on a single parameter that allows a...
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