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2nd IEEE Conference on Control Technology and Applications, CCTA 2018

作者： Da Silva Moreira, Lucas José Acioli, George Barros, Péricles Rezende Post-Graduate Program in Electrical Engineering PPgEE COPELE Federal University of Campina Grande UFCG Campina Grande PB58429-900 Brazil Electrical Engineering Department DEE Federal University of Campina Grande UFCG Campina Grande PB58429-900 Brazil

ISBN: (纸本)9781538676981

This paper is about a data-driven frequency domain PID retuning from the initial controller parameters. It uses data collected from a specific closed-loop experiment to estimate frequency response points. The data-driven retuning method is applied to make a process matches with the defined reference model using a convex optimization technique that minimizes modified cost function. The proposed strategy is demonstrated in laboratory scale thermal plant based on Peltier effect, using crossover and critical frequencies estimations. © 2018 IEEE.

关键词： Frequency estimation

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High Impedance Fault Detection based on Stockwell Transform

High Impedance Fault Detection based on Stockwell Transform

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： Erica Mangueira Lima Rodrigo de Almeida Coelho Nubia Silva Dantas Brito Benemar Alencar de Souza Electrical Engineering Post Graduate Program Federal University of Campina Grande Campina Grande Brazil

A high impedance fault (HIF) detection method is proposed in this paper. Several parameters are extracted using the Stockwell transform, which is a relatively new multi-resolution tool with the ability to provide good resolution on both time and frequency domain, simultaneously. Those parameters are used to identify a HIF occurrence and distinguish it from other common disturbances such as capacitor banks switching, feeder energizing and solid faults. Two databases are used to validate the method, one with simulated data and one with real HIF oscillographic records, obtained from field experiments. A brief analysis of parameters behavior is also presented, since it is necessary for method's development. Results show the method is able to detect HIF on both simulated and real data in viable time, using only the substation as observation point. Also it can distinguish the fault from other tested disturbances.

关键词： Frequency-domain analysis Transforms Harmonic analysis Capacitors Solids Databases Impedance

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The Effect of Grounding Resistance about Back Flashover on 150 KV Tranmission Network in Main Station of Sungguminasa - Tallasa (Makassar)

The Effect of Grounding Resistance about Back Flashover on 1...

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International Conference on Computation in Science and engineering, ICCSE 2017

作者： Lembang, Naomi Manjang, Salama Kitta, Ikhlas Electrical Engineering Department Jl. Perintis Kemerdekaan KM. 10 Makassar Sulawesi Selatan90245 Indonesia Post Graduate Program of Hasanuddin University Jl. Perintis Kemerdekaan KM. 10 Makassar Sulawesi Selatan90245 Indonesia

Lightningsurge on transmission network is a natural problem that affecting electricity voltage. This impact on the occurrence of equipment damages as result of back flashover. Back flashover causes an impulse wave due to the increase of voltage on the transmission and has a large grounding resistance value. There has been a disturbance in the transmission system SULSELRABAR causing black out on Tuesday, January 19th, 2016 at 14:13 pm. The disturbance occurred along with the rain and strong winds accompanied by lightning which caused the load loss of 746 MW. The research was conducted to determine the occurrence of direct lightning strikes on each tower, the effect of grounding resistance to back flashover on150 kV transmission network in main station of Sungguminasa - Tallasa, using modeling simulation of peak menara transmission network 150 kV in main station of Sungguminasa - Tallasa with software ATPDraw (Alternative Transient program). The simulation results depicting one of the phase wire reach the peak current of 359.89 MA. In this condition occurs disruption that causing the impulse voltage and back flashover with disturbance current 22.65 kA. The large of grounding resistance has an average voltage exceeding the capacity limit from 1001.54 kV to 1042.31 kV. Based on the calculation, the impulse voltage obtained is 5.271 MV close to simulation result of ATPDraw(Alternative Transient program) by 4.530 MV. The calculation of the current wave when there is lightning disturbance in the transmission line with a peak current of 60 kA and the wave front time of 1 set, obtained the highest value that is on the tower 39 the grounding value of 5.4 Ω, the grounding value obtained reflection coefficient of -0.937 and insulator voltage at 957.036 kV, the results of this research held the measurement of tower 39 using Megger Det4tcr and obtained the grounding value on the tower feet of 12.22 and 9.97 ohm. What makes this case interesting is that the installation is located

关键词： Electric grounding

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Appropriateness of Water Hyacint and Rice Husk as Filler Materials for Resin Polymer Insulation

Appropriateness of Water Hyacint and Rice Husk as Filler Mat...

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International Conference on Computation in Science and engineering, ICCSE 2017

作者： Fitriah, Trisna Amelia Manjang, Salama Kitta, Ikhlas Electrical Engineering Department Jl. Perintis Kemerdekaan KM. 10 Makassar Sulawesi Selatan90245 Indonesia Post Graduate Program of Hasanuddin University Jl. Perintis Kemerdekaan KM. 10 Makassar Sulawesi Selatan90245 Indonesia

The use of natural fibers as a filler in the industry still continue to be developed, given its eco-friendly and contains material which is great. This research was conducted to find out the influence of boiled water and rice husk as filler material in epoxy resins. The making of the specimen using the method of hand lay-up with each variation of filler 10%-40% of the total weight of material test and the specimen without filler 0% for contrast. Polymer materials used i.e. epoxy resins. Testing is done namely pull-test, test volume resistivity and surface resistivity. Pull-test is performed using standard ASTM D-638 and resistivity test using standard ASTM D 257. The test results showed that the maximum volume resistivity values reached in the levels of water hyacinth 20% whereas on rice husk volume resistivity increase continues to occur until levels of 40% of the epoxy resins. Surface resistivity continues to increase in the levels of water hyacinth reaches 20% on epoxy resins as well as the addition of a filler rice husk. The tensile strength of the epoxy resins materials has decreased with the addition of water hyacinth and rice husk. The value of the maximum attainable tensile strength on the composition of the filler is 20%. With increasing levels of water hyacinth and rice husk in epoxy resins, the nature of the material brittle epoxy resins increase or an increase in the hardness of epoxy resin resulting in fragility. © Published under licence by IOP Publishing Ltd.

关键词： Epoxy resins

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Identifying irregularity electricity usage of customer behaviors using logistic regression and linear discriminant analysis 3

Identifying irregularity electricity usage of customer behav...

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3rd International Conference on Science in Information Technology, ICSITech 2017

作者： Lawi, Armin Wungo, Supriyadi La Manjang, Salama Department of Computer Science Post-graduate Program of Electrical Engineering Dept. Electrical Engineering Universitas Hasanuddin Makassar Indonesia

ISBN: (纸本)9781509058662

This study aims to implement a machine learning technique in identifying the irregularities of customer behavior on the use of prepaid electricity pulses. The methods used are Linear Discriminant Analysis and Logistic Regression. The performance of the classification system will be evaluated using the 10-fold cross-validation technique. Validation results are measured using accuracy, precision and recall values. In this research shows that the use of machine learning technique has a good performance in classification of electrical consumption behavior. Experimental results with the different amount of data testing indicate that Logistic Regression method has high accuracy, precision, and recall value when compared with Linear Discriminant Analysis that is 100%. This is due to Logistic Regression method can predict irregularities accurately because the addition of the amount of data does not affect the performance of the method. © 2017 IEEE.

关键词： Regression analysis

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Application of a Robust Relay Feedback Structure for TITO Processes

Application of a Robust Relay Feedback Structure for TITO Pr...

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IEEE Conference on Control Technology and Applications

作者： Moisés T. da Silva Péricles R. Barros Post-Graduate Program in Electrical Engineering Federal University of Campina Grande Campina Grande PB Brazil Electrical Engineering Department Federal University of Campina Grande Campina Grande PB Brazil

In this paper, a relay feedback structure which is robust to disturbances is applied to estimate multiple frequency points of processes with two-inputs two-outputs (TITO). The relay structure is composed of a block to remove static disturbance or drift followed by a relay. This block consists of a simple high-pass filter followed by a relay plus an integrator. Since the relay structure used is able to reject disturbance, during the relay feedback test, a step change and a periodic square wave with frequency lower than the ultimate frequency are applied at the process input. Thus, these frequencies information are used to estimate a FOPTD model in a wider frequency region. The proposed approach is illustrated using the Woody-Berry distillation column model. Simulation examples illustrate that the robust relay structure ensures a symmetric oscillation of the TITO process output, even under disturbances.

关键词： Application Robust Relay Feedback Structure TITO Processes

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Two-phase open-end winding induction motor drive using improved current source inverter 9

Two-phase open-end winding induction motor drive using impro...

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9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017

作者： De Costa, Louelson A.L.A.C. Vitorino, Montiê A. Braga-Filho, Edgar R. Corrêa, Maurício B.R. Fernandes, Darlan A. Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Brazil Campina Grande - PB Brazil Joao Pessoa - PB Brazil

ISBN: (数字)9781509029983

ISBN: (纸本)9781509029983

In this work it is presented a two-phase open-end winding induction motor (IM) driven by an improved current source inverter (CSI). The proposed inverter has independent full quadrant operation, lower DC-link current value, high magnetics power density, 25% more efficient and high AC output voltage waveform quality compared to conventional CSI solutions. A back-to-back AC-DC-AC current source converter is used to drive the two-phase open-end winding IM, where in the AC-DC portion it is used a conventional three-phase three-leg rectifier, and the proposed two-phase inverter is used in the DC-AC portion. The two-phase IM model is also presented. Two motor drive methods for the improved CSI are used: Volts/Hertz and modified q-axis indirect flux oriented control. Simulation and experimental results are provided in order to validate the theoretical approach. © 2017 IEEE.

关键词： Induction motors

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Development of concept essential in kinematic topics

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Journal of Physics: Conference Series 2020年第2期1521卷

作者： R Ekawati A Setiawan A R Wulan D Rusdiana Department of Vocational Electrical Engineering Education Universitas Sultan Ageng Tirtayasa Jl. Raya Jakarta Km. 4 Serang 42124 Indonesia Science Education Program School of Post Graduate Studies Universitas Pendidikan Indonesia Jl. Setiabudhi No. 229 Bandung 40154 Indonesia

Essential concepts were important aspects in physics education, especially in the study of learning development, student evaluation, and curriculum planning. Several types of concept analysis models are commonly applied in the context of physics, i.e. sematic network techniques, concept formation (concept analysis), concept maps, and representing substantive structure. The stages of essential concept development were concept analysis, concept map and essential concept. The research method used development research. The stages of development research included (1) the preliminary study phase, (2) the development study phase, (3) the evaluation phase. The main results of this study were essential concepts on the topic of Kinematics.

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The modeling of 80 mm diameter cross flow turbine runner for mini/microhydro environmentally friendly power plant

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Journal of Physics: Conference Series 2019年第1期1217卷 012013-012013页

作者： Purwanto Budiyono Hermawan Environmental Doctorate of Diponegoro University Post Graduate Program Semarang Indonesia Vocational School of Diponegoro University Semarang Indonesia Electrical Engineering Department Faculty of Engineering Diponegoro University Semarang Indonesia

Indonesian river’s potentials on Mini or Microhydro fuelled power plants has not been maximally explored despite its big potentials of utilization. The 500 MW energy potentials of Mini or Microhydro throughout Indonesia have only reached the point of 4.5% while National Energy Management Blueprint in 2050 targeted 31% of renewable energy (RE) is coming from Micro hydro energy. The applications of 80 mm diameter cross flow turbine in a household scale have drawn an increase in its experience with 450 Watts of power produced through small discharge of 20 liters/second and 3-meter head. Cross flow turbines testing in 130 mm length and 80 mm diameter conducted using Mini / micro hydropower Plant in environmentally friendly power House drum. Lower investment and operational design cost also to be made on its aim to reach community group or individual segments.

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Fuzzy Preference Relations: Methods and Power engineering Applications

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OPSEARCH 2017年第1期39卷 34-45页

作者： Petr Ya. Ekel Luiz D. B. Terra Post Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil

Two classes of problems are considered within the framework of a general approach to solve optimisation problems with fuzzy coefficients, referred to as and models in the literature. This paper is concerned with the latter and proposes an approach which replaces the initial problem by a set of associated mutually interrelated models. To reduce the decision uncertainty region, the problem is converted to a multicriteria decision problem in a fuzzy environment using two methods. The first method reduces the region sequentially through a step-by-step comparison of alternatives. The second method analyses membership functions of a subset of non-dominated alternatives, considering all criteria simultaneously. The results have general applicability and are being used in power engineering planning in Brazil.

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