A Study about solar tracker for the performance of photovoltaic plants Barros e Silva, Manuella R. M. F.; Albuquerque, Kaique R. de A.; de Araujo, Jose V. S. ...
2022 6th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT),
2022-Aug.-22
Conference Proceeding
Solar energy represents 2.6% of the electricity matrix in Brazil, according to 2022 data from Operador Nacional do Sistema Elétrico (ONS), a significant increase compared to 2020, when the ...representation was 2.0%. In addition to the desire to expand this sector, it is necessary to seek different ways to improve generation performance, such as, for example, the search for techniques that enhance energy generation through panels. This article aims to present a simulation study on the characteristics and productivity comparisons between mono and two-face photovoltaic panels, as well as comparisons on the generation of horizontal modules or with the use of trackers, with the Study and Analysis of an Automatic Control System of Trackers - analysis of the functioning of a conventional tracking system to observe functional aspects of interest.The study was carried out using data available in the National Renewable Energy Laboratory (NREL) database on climate information regarding the location of the roof of the CEAR (Center Alternative and Renewable Energies) laboratory located at the Federal University of Paraíba in the city of João Pessoa. The state of Paraíba was chosen because the simulations were carried out to predict the performance of the system that will be assembled in the city of João Pessoa.
Hybrid Radiometric Location of Partial Discharge Sources Duarte, R.M.; Villanueva, J.M.M.; de Souza Neto, J.M.R. ...
2019 4th International Symposium on Instrumentation Systems, Circuits and Transducers (INSCIT),
2019-Aug.
Conference Proceeding
One way to diagnose the wear of electrical equipments is to identify the occurrence of partial discharges. From the detection of partial discharges, the maintenance of defective equipment can be ...programmed. Thus, the reliability of the system is increased and the chances of interruption decrease. Additionally, the information provided by partial discharge signals can be used to estimate the location of the source. In this work, we present a hybrid radiometric localization based on the energy and time of arrival of these signals. Using a two-dimensional ray tracing simulation model loaded with the map of a high voltage substation, this new technique was compared with two techniques based on the difference of the time-of-arrival of the signal at different receivers. Despite the reduced complexity, the hybrid technique has lower performance than those based on arrival times.
Partial discharges measurements are an important tool for the determination of the degradation level of high voltage apparatus. If partial discharge is found in insulating systems then it is ...important to identify its character, i.e. internal discharge, surface discharge, corona etc. The aim of this paper is present a methodology for the generation of partial signals with different characteristics using two developed partial discharge cell, that allows the generation of well defined PD pulses, that can be used in creation of patterns that allow the automatic (aid computer) defects classification based on the employment of artificial intelligence techniques.
Partial Discharge (PD) is characterized by high frequency current pulses that occur in the interior of high voltage (HV) apparatus. It involves gas ionization processes within insulators and can ...therefore indicate insulation defects. Low levels of PD are not necessarily of urgent concern in the context of safe operation of plant but they may gradually increase with the time, until complete discharge (flashover) occurs causing catastrophic plant failure. PD levels and their occurrence are therefore monitored (usually periodically) during the operational lifetime of HV equipment. This paper compares PD measurements made using three different techniques: the `classical' method described in IEC 60270 1, the high frequency current transformer (HFCT) method and a free-space radiometric (FSR) method. The comparison is made with a view assessing the practicality of replacing the classical quantitative method with other more convenient/cheaper methods.
