by Oyeleye M. O. and Ayoola S. A.
Original Research
The need for power increases every day and problems encountered with the use of generating sets characterized with noise pollution, environmental pollution and the need for regular servicing call for the need for a system that eliminate all of the aforementioned problems. This research focus on design and construction of 1.5 kVA modified sine wave MOSFETs driver inverter to power critical loads in offices and homes. In order to achieve the focus of this research, load survey of the critical loads was done and other necessary components of the inverter were sized based on the designed loads using the appropriate equations. The load was classified into two categories namely: load A (694A) and B (593A) which were non inductive and inductive respectively. The inverter was designed to power the loads A and B (1287A) at the same time. The inverter powered critical loads A and B between 90.4 % and 91.7% efficiency respectively when it is individually connected. Also, the inverter powered the critical load A and B at the same time with efficiency of 84%. The inverter is in operation for over twelve months to date. The result showed that as the load increases, the voltage output decreases and so also the efficiency decreases. The designed inverter is suitable for all connected loads. The designed inverter can be used as a backup in case of main utility power failure for homes and offices. Higher power output could be further researched into.
American Journal of Electrical and Electronic Engineering. 2020, 8(1), 35-42. DOI: 10.12691/ajeee-8-1-5
Pub. Date: March 01, 2020
7333 Views1011 Downloads
by Mohamad Saleh Sanjari Nia, Mohammad Altimania, Pourya Shamsi and Mehdi Ferdowsi
Original Research
The principal object of this paper is to provide a comprehensive approach for parallel processing of potential and electric field calculations. The approach investigated under dry and wet conditions for two types of insulators, the ceramic cap and pin and the polymeric, in three different high voltages: 230 kV, 400 kV, and 765 kV account for the two design factors: towers and bundled conductors. Moreover, corona is an important phenomenon associated with all transmission lines that causes the surrounding air molecules to ionize, or undergo a slight localized change of electric charge. As such, the effects of the corona rings on the insulators considering potential and electric field distribution are other objects of this paper. Decisively, this requires accurate and efficient modeling of the proposed insulators on the tower conductors of the transmission lines which is derived by a detailed localized potential and electric field distribution approach that combines the different aspects of the transmission high voltages. The corona rings' optimization for six individual insulators is another object of this study.
American Journal of Electrical and Electronic Engineering. 2020, 8(1), 26-34. DOI: 10.12691/ajeee-8-1-4
Pub. Date: January 11, 2020
9224 Views962 Downloads
by Marwa Fathalla Mostafa, Guanghui Wang and Asmaa Ibrahem Abo Seada
Original Research
In view of the shortcomings of particle swarm optimization such as premature convergence to local optimization, particle swarm optimization algorithm based on quantum gate and particle swarm optimization algorithm based on quantum behavior are studied in this paper. The first algorithm uses the random observation method of quantum bit coding particles to simulate quantum particle collapse for generating a population and uses the quantum rotating gate to generate a new population. The adaptive mutation operator is used for ensuring the diversity of the population, effectively reducing the impact of local optimization; therefore, the robustness of the algorithm is improved. The second algorithm uses the probability density function of quantum computation to make the particles jump out of the local extreme points and fulfils the global search, which is more suitable for continuous optimization. The results of computational experiments show that both the two particle swarm optimization algorithms based on quantum technology have a good global convergence.
American Journal of Electrical and Electronic Engineering. 2020, 8(1), 21-25. DOI: 10.12691/ajeee-8-1-3
Pub. Date: January 05, 2020
7145 Views1981 Downloads6 Likes
by Manoj Kumar Jain, V. K. Singh and Raj Senani
Original Research
This paper presents a state-variable synthesis of a class of electronically-controllable sinusoidal oscillator circuits which employ Multiple output second generation controlled current conveyors (CCCII) as active elements, do not require any external passive resistors and employ only two grounded capacitors (GC). The systematic synthesis yields a class of fourteen new oscillators all of which provide independent electronic controls of both the frequency of oscillation and condition of oscillation through separate external bias currents. All the aforementioned features make the synthesized oscillators attractive from the view point of integrated circuit implementation. The workability of the derived circuits has been confirmed from SPICE simulations and some sample results are included. Based upon their performance, evaluated through simulations, the new circuits have been compared with those previously known as well as among themselves and the best circuits of the derived set have been identified.
American Journal of Electrical and Electronic Engineering. 2020, 8(1), 11-20. DOI: 10.12691/ajeee-8-1-2
Pub. Date: January 03, 2020
10362 Views1555 Downloads
by Dharmesh Kumar Srivastava, Vinod Kumar Singh and Raj Senani
Original Research
A class of second order sinusoidal oscillators is presented which employs a single Current feedback-operational amplifier, four capacitors and four to five resistors which can be realized by CMOS linear voltage controlled resistors (VCR). The proposed circuits are simultaneously single resistance controlled oscillators (SRCO) as well as single capacitor controlled oscillators (SCCO) providing independent control of condition of oscillation and frequency of oscillation through independent resistors as well as independent capacitors. To the best knowledge of the authors, any single-CFOA-based oscillators which are simultaneously SRCOs as well as SCCOs have not been reported in the literature earlier. SPICE simulation results using 0.18μm CMOS technology have been given which confirm the validity of the proposed circuits.
American Journal of Electrical and Electronic Engineering. 2020, 8(1), 1-10. DOI: 10.12691/ajeee-8-1-1
Pub. Date: December 29, 2019
12292 Views1416 Downloads1 Likes