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Sep 14, 2017Open    AccessArticle

A New Strategy for BLDC Sensorless Control System and Its Application in Horizontal Well Tractor

Shuhan Yu, Yongjun Chen
The positionless brushless DC motor has the advantages of simple structure, good speed performance and high efficiency. It has become the best choice for horizontal well tractor. This paper introduces a set of brushless DC motor control system, gives the hardware structure of the system and brushless DC motor without Hall sensor control flow chart and the host computer communication interface protocol which solves the problem of p

Jul 21, 2017Open    AccessArticle

Review on the Coordination and Energy Management of Microgrids Broad Based on PQ Controller and Droop Control. Some Useful Information Is Given in This Paper

Aphrodis Nduwamungu
The integration of distributed Energy Resources (DER) is challenging electrical network quality which is the main vital and ubiquitous all over the world. Coordination and energy management of microgrids in grid connected and in islanded mode is one of solutions of distribution power quality with best reliability, and stability to ensure power system resilience. In this review, the coordination and energy management of microgrids

Jun 20, 2017Open    AccessArticle

Design of the Brushless DC Motor Driving System Based on STM32

Haoran Jin, Xiang’e Sun
As a mechanical and electrical integration product, brushless DC motor has better controllability and wide speed range. According to its characteristics, a brushless DC motor control system based on STM32F103ZET6 MCU is designed and realized, and then the control system was analyzed and discussed. Adopted GPIO module, PWM module, timer module, etc., coupled with efficient PID algorithm, three main functions of this system have bee

May 03, 2017Open    AccessArticle

Design and Development of Maximum Power Point Tracker for Solar Module Using Microcontroller

M. Tabassum, M. A. Aziz Jahan, N. Jahan, M. M. Rahman, M. N. Sadik
The main objective of this paper is to design and develop a Maximum Power Point Tracker (MPPT) for solar modules using microcontroller. Maintaining a solar panel or an array of panels without an MPPT will often result in power loss, which in return requires installing more panels for the same power requirement. This will also result in premature battery failure or capacity loss. This is why the controllers of all solar power syste

Jan 20, 2017Open    AccessArticle

Testing through Fall of Potential with High Current Injection in Grounding System in Transmission Line of 500 kV of Santo Antonio HPS

Carlos Magno B. Araújo, Luiz H. P. C. Trondoli
This paper presents the application of grounding resistance measurement by fall of potential with high current injection, applied to the Transmission Line (TL) of 500 kV of Santo Antonio Hydroelectric Power Station (HPS), located in the city of Porto Velho/RO, for the commissioning of the power house grounding system in Generation Group (GG2) and TL during construction of the referred project. Based on measurements obtained in fie

Nov 11, 2016Open    AccessArticle

Battery Explosions and High Current Bursts during Short Circuit Events on Conducting Paths with Curvature

Christos D. Papageorgiou, T. E. Raptis
Experimental results of linear and curved conducting thin wires’ disintegration under high power but low energy electrical discharges are reported. Microscopic origin of the anomalous energy release is traced into the lattice interaction with the strong transient radiation field causing the appearance of a strong Stark effect out of the polarization of the metallic surface. The possible role of the wire curvature is also explored

Sep 30, 2016Open    AccessArticle

The Pacific Submarine Cable and Its Impact on Japan in the 19th Century

Tomoko Hasegawa
The submarine cable served as one of the most important tools of the western powers in their quest for empire-building and commercial profits in the 19th century. Thus the construction of a submarine cable across the Pacific Ocean became a priority for the western powers, especially the United States and the United Kingdom, in pursuit of their commercial and political interests into the Asian market. The construction of the Pacifi

Jul 26, 2016Open    AccessArticle

Ringing and Voltage Overshoot Analysis of a Proposed DC/AC Converter

Gierri Waltrich
This research presents a study of the ringing and voltage overshoot analysis of a proposed DC/AC converter. This overvoltage is generated due to the resonance between three passive components: transformer leakage inductances, switch capacitances, and wiring resistances. By applying simple RLC circuit equations, it proves possible to determine the analytic equations and reproduce the voltage across the switche

Jul 26, 2016Open    AccessArticle

Inductances Design of High-Frequency Coaxial Transformers

Gierri Waltrich
In this paper is proposed a methodology to properly determine the leakage and magnetizing inductance of a single-phase high-frequency coaxial transformer. Both, leakage and magnetizing inductance equations are determined considering the transformer dimensions, the ferromagnetic characteristics, and the number of turners. Finite element methods (FEM) and a low scale prototype are also used to validate the equations

Jul 20, 2016Open    AccessArticle

LPC for Signal Analysis in Cellular Network Coverage

Koffi Agbeblewu Dotche, Francois Sekyere, Walter Banuenumah
This paper introduces a novelty method of using a Linear Prediction Coefficient (LPC) filter, a digital signal processing (DSP) tool to get accurate signal measurement in noisy mobile environment. By measuring the received power of a mobile radio, it also measures the coverage of an area served by several base stations. For results’ validation, the mobile received power at user end of two Code Division Multiple Acccess-2000 (CDMA2