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The PROFIBUS (Process Field Bus) DP is the most popular field bus communication used in the worldwide industry. Many factors contribute for its popularity: protocol simplicity and flexibility in baud rate, cable length and number of equipments by network. This flexibility causes huge acquisition time and reaction time variations for different network setups. This work shows an analog process variable...
A power control scheme for doubly-fed induction generator for variable speed wind power generation was proposed. Using deadbeat controller and by using stator field oriented, the algorithm calculates the voltage vector to be supplied to the rotor in order to eliminate the active and reactive power errors in each period. Experimental results are presented for validation of the deadbeat controller operation.
This paper presents a classifier based on a net neural MLP (Multiple Layers Perceptron) using the algorithm of Levenberg-Marquardt to do the identification of the load of vehicles through the magnetic profile collected in equipment of control of traffic.
The robot presented in this paper was designed to find damages to the external sheath of offshore pipelines. The pipeline section subject to inspection is known as “riser” and connects the pipe running on the seabed to the production facility at the platform or “floating production, storage and offloading” ship (FPSO). When compared to the current tools used to perform this work, the main advantage...
This paper presents study of a DC-DC converter based on three-state cell for application in Electric Vehicles (EVs). The converter is designed to operate in mode Boost and mode Buck. The presented topology enables the bidirectionality of energy, with situations that the current is returned by the load to the bus formed by a group of batteries. A analysis converter is done, the converter is designed...
This work proposes a design and tuning method for PI regulators, based on the three-phase induction motor mathematical model complex transfer function to be used in induction motor direct torque control when the machine operates at low speed which is a problem so far. The PI controller was designed and tuned by frequency-response function of the closed loop system. The PI gain controller presents...
This paper presents a controlled power converter for three-phase grid connected systems. When the power converter operates connected to the grid the current/power is used as control variable. However, if the power converter is operating in stand alone mode (on contingency or islanding mode) the control variable must be changed to voltage. Finally, the paper analyzes the effects of different loads...
This paper proposes a model based predictive controller for direct power control of DFIG. The control law is derived by optimization of an objective function that considers the control effort and the difference between the predicted outputs (active and reactive power) and the specific references, with predicted outputs calculated using a linearized state-space model. Because the generator leakage...
This paper describes the development and a real application of a new digital self-tuning control scheme when applied to a damped pendulum system for trajectory tracking. The proposed control technique is derived from the optimization of a quadratic performance index which includes an additional weighted derivative term. The self-tuning control action is implemented with a recursive identification...
This paper intends to present a mathematic model of operation of a headbox designed for papermaking, analyzing possible setups of the productive process through stock jet speed, as well as the variables of lip opening and jet-to-wire ratio. On the progress of this work are simulated the control regulators of pressure and jet speed, permitting its optimization in amplitude, and performance evaluation...
This article presents the application of a new concept for collision detection into robotic virtual environments. This concept, named Semantic Coherence, aims to make an earlier evaluation of the virtual environment as a mean to foresee true cases of non-collision or situations of major probabilities of collision. The proposed approach was implemented in two case study environments: (i) an isolated...
This paper presents a five-level bridge inverter based on a commutation cell of three states. The principle of operation of this inverter is described and the main theoretical waveforms are presented, as well as the experimental results. The proposed inverter has the following advantages over classical converter: the output voltage has five levels, the frequency in the output filter is four times...
The presence of friction and other non-linearities is a cause of oscillations in control loops, with negative effects on quality and cost of goods. The method of describing function is traditionally used to predict the period and amplitude of cycles limit control loops. This method is used in this article for detection and quantification of nonlinearities, using for this usual process data and an...
The treatment of swine manure using anaerobic digesters provides the formation of biogas, a fuel gas composed, mainly, of methane and carbon dioxide. One form of exploitation of biogas is its use in power generation. This paper aims to evaluate the performance of an engine-generator set powered by biogas regarding the power quality under various loading conditions. Using a power analyzer, were recorded...
This paper discusses a new method to describe movements by fuzzy predictors and to design new open loop fuzzy controllers, for multilinked vehicles or mobile robots, using constant step approximators to model complex maneuvers with delays that vary with the robot's configuration. The “Wang & Mendel” technique for automatic modeling is tested and an ad hoc heuristic is proposed to fulfils the deficiencies...
Electrical energy from photovoltaic panels (PV) has became an increasing viable alternative because of the great concern for environmental preservation and the possibility of the reduction of the conventional fuels, and this natural energy source is free, abundant and clean. In addition, Brazil is a privileged country because of the high levels of irradiation throughout its territory all over the...
This article presents the process of research and development of OpenVisionBot. The OpenVisionBot is a project for developing a platform for mobile robots. The mechanical project, the electro-electronics project and the software algorithms of phase I were performed in the Mechatronics Research Group of Federal Institute of Santa Catarina (IF-SC). The goal of OpenVisionBot is to be a platform with...
The compressed air systems represent plot expressive of energy consumption of an industrial plant. However, the use and inadequate maintenance cause reduction in the overall performance featuring a constant source of waste. Thus, this work is directed to the development and proof of techniques to analyze the energy efficiency of compressed air systems. The analysis will be conducted in the compressor...
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