American Journal of Electrical and Electronic Engineering

Managers of large scale industry like the electricity generation are challenged at many fronts because the tasks involved are complex, influenced by unexpected events and evolve in time. Currently the application of computer methods in this industry has produced tremendous positive results. In this regard, the study presents an effort developed to solve optimal power flow (economic dispatch) problem by minimizing the cost of generation using the lagrangian multiplier method. A decision support system ‘Lantool’ is presented. The approach is validated by lagrangian method found in technical literatures. The system will assist operators in thermal power plants with the task of planning generation in the most economic way. A result obtained from the application explains the important role decision support systems can play in the management of the electricity generation industry.

American Journal of Electrical and Electronic Engineering. 2014, 2(1), 21-26. DOI: 10.12691/ajeee-2-1-5
Pub. Date: January 17, 2014

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Selective Harmonic Elimination (SHE) for 3-Phase Voltage Source Inverter (VSI)

by V. Karthikeyan, V.J. Vijayalakshmi and P. Jeyakumar

Review Article

The Selective Harmonic Elimination (SHE) for 3-Phase Voltage Source Inverter (VSI) is presented here. The projected work investigates the Selective Harmonic Elimination (SHE) to eliminate harmonics produced by Pulse Width Modulation (PWM) inverter. The selective harmonic elimination method for three phase Voltage Source Inverter (VSI) is generally based on ideas of opposite harmonic injection. In this proposed scheme, the lower order harmonics (3rd, 5th, 7th, and 9th) are eliminated by the dominant harmonics of same order generated in opposite phase by Sinusoidal Pulse Width Modulation (SPWM) inverter and by using this scheme the Total Harmonic Distortion (THD) is reduced. Analysis of Sinusoidal Pulse Width Modulation (SPWM) technique and Selective Harmonic Elimination (SHE) is simulated using MATLAB/SIMULINK model.

American Journal of Electrical and Electronic Engineering. 2014, 2(1), 17-20. DOI: 10.12691/ajeee-2-1-4
Pub. Date: January 16, 2014

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Comparison between the Vector Control Based on Anti-saturation Capability with the Sensorless Vector Control in PMSM

by Behzad Salmani, Fariborz Lohrabi Pour and Mohammad Bagher Bana Sharifian

Original Research

This paper investigates a comparison between the sensorless vector control method based on MRAS (Model Reference Adaptive System) using SVPWM (Space Vector Modulation) and the control method of the PMSM (Permanent Magnet Synchronous Motor) Based on anti-saturation current controller. MRAS algorithm is based on comparison between the estimators. The error between the estimated quantities obtained by the two models is used to evaluate the rotor speed that started in order to create an optimum vector control method. This method is compared with vector control based on anti-saturation current control block. That created in order to reduce the ripple in vector control current. These two control method were simulated in MATLAB and after comparing the current THD(Total Harmonic Distortion) of the two methods, it was observed the vector control based on anti-saturation block with shaft encoder has bigger volume, less current ripple and more cost than sensorless method.

American Journal of Electrical and Electronic Engineering. 2014, 2(1), 11-16. DOI: 10.12691/ajeee-2-1-3
Pub. Date: January 12, 2014

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High Gain, Two-Stage, Fully Differential Audio Amplifier with 0.18μm CMOS Technology

by Siavash Heydarzadeh and Ramezan Ali Sadeghzadeh

Original Research

The two-stage, fully differential audio amplifier with 0.18μm CMOS technology and TSMC process is proposed. Telescopic amplifier created stage one and common emitter structure used to provide high gain in stage two. The amplifier has a ±1.2V differential output swing and a gain greater than 127dB while consuming power less than 10mW from 1.8V supply voltage. The step response of the audio amplifier is about 0.04us and the gain-bandwidth of the circuit is near 1.1GHz. Hspice software used to produce simulation results.

American Journal of Electrical and Electronic Engineering. 2014, 2(1), 6-10. DOI: 10.12691/ajeee-2-1-2
Pub. Date: January 12, 2014

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A Comparative Study on Induced Currents in Steel Reinforced Building Due to a Nearby Lightning Strike to Ground and a Strike to Nearby Elevated Object

by Vishwanath Hegde and Vinoda shivanand

Original Research

In the present work a study is carried out to determine the magnitude and nature of the induced current in the steel of a steel reinforced concrete building due to a nearby lightning stroke to ground and strike to nearby elevated objects. A comparison of the two is presented. For the study, buildings of three different heights with number of floors are considered. The vertical down conductor of different heights is considered as nearby elevated object. Lightning channel of length 1 km is employed. Two velocities of propagation of channel current, one equal to velocity of light and another of 1/3 of velocity of light are considered. A current source model for the source is employed for the study. Electromagnetic model is employed and Numerical Electromagnetic Code-2 (NEC-2) is used for the numerical field computations. It is found that when lightning strikes the elevated object which is nearby to the building, induces more currents in steel parts of the building rather than the current due to nearby strike to ground. The height of the elevated object also has significant effect on the magnitude of the induced current.

American Journal of Electrical and Electronic Engineering. 2014, 2(1), 1-5. DOI: 10.12691/ajeee-2-1-1
Pub. Date: January 10, 2014

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