by Kunzang Chophel, Tshewang Lhendup, Roshan Chhetri and Pravakar Pradhan
Original Research
The global shift of vehicular transportation from conventional cars to electric vehicles present yet another challenge for the power utilities in meeting the growing demand for Electric Vehicles (EV). Large penetration of electric vehicles can have numerous impacts on the electric grid if left unaddressed. This paper presents the assessment of the impact of EV charging on the electricity distribution network at different penetration levels. A model of an existing electricity distribution network of Thimphu, the capital city of Bhutan was developed in DIgSILENT power factory simulation software. The impact of EV charging on the existing electricity distribution network was analysed based on three hypothetical assumptions, current status-quo, low uptake level, and high uptake level. The impacts were evaluated on two key parameters, the voltage stability, and the transformer loading. The load flow simulation indicated that a low voltage violation was triggered even at a low penetration level of 0.28% and the maximum penetration level is attained at 37.68% where the whole system is likely to breakdown due to severe voltage collapse on the distribution system. Based on the simulation results, a mitigation technique for voltage correction has been discussed.
American Journal of Electrical and Electronic Engineering. 2020, 8(4), 131-137. DOI: 10.12691/ajeee-8-4-6
Pub. Date: October 25, 2020
5588 Views267 Downloads
by Aleksei Stafeev
Review Article
The issues of suppression of impulse (non-Gaussian) disturbances in the receiving devices are considered. The analysis of the generalized-Gaussian distribution law was made. The amplitude characteristics of non-linear elements are calculated. A comparison of the effectiveness of pulse interference suppression was made. It is shown that the amplitude characteristics of non-linear devices should relate to the density of the noise distribution.
American Journal of Electrical and Electronic Engineering. 2020, 8(4), 125-130. DOI: 10.12691/ajeee-8-4-5
Pub. Date: October 22, 2020
4899 Views284 Downloads1 Likes
by Soumya Mourya and Raj Senani
Letter To Editor
In this communication, a new CMOS circuit configuration is proposed to realize a voltage-controlled negative resistance (VCNR) which has been implemented using only eight MOS transistors- all working in the saturation region. The value of the realized negative resistance is controlled by two identical and opposite external DC voltages. The workability of the proposed circuit has been confirmed by Cadence Virtuoso simulations and some sample results have been given. The proposed VCNR circuit has been shown to exhibit good linearity, has good variable negative resistance range from -1.05kΩ and -300Ω and offers a good operational frequency range up to around 100 MHz with total power dissipation between 0.5mW- 8.73mW only.
American Journal of Electrical and Electronic Engineering. 2020, 8(4), 120-124. DOI: 10.12691/ajeee-8-4-4
Pub. Date: September 10, 2020
4004 Views478 Downloads
by Ching-Sung Wang, Bai-Yi Zhou and Jia-Hua Gu
Case Presentations
The purpose of this study is to design a device that can handle emergency situations when the vehicle is overturned, abnormal gas is generated, or it is accidentally flooded by water. The device is fixed in the corner of the front passenger seat, uses the vehicle power supply as the device power, and uses Bluetooth to connect to the mobile phone. Once one of the above three situations occurs, the device will open the window glass and urgently call for rescue operations. The sensor is divided into two stages to prevent errors in detecting the water level or abnormal gas concentration. The first alarm is a basic judgment that enables the personnel in the car to react to the situation. Once the second alarm occurs, the system will determine that the signal has reached the warning value, the personnel in the vehicle are in danger and the window glass should be opened immediately. This design ensures the safety of the people in the car in the event of a dangerous or unexpected situation, and also prevents unnecessary damage to the car.
American Journal of Electrical and Electronic Engineering. 2020, 8(4), 116-119. DOI: 10.12691/ajeee-8-4-3
Pub. Date: September 08, 2020
4061 Views469 Downloads
by Dr. Francisco Bulnes, A J. C. García-Limón, L. A. Ortiz-Dumas and V. A. Sánchez-Suarez
Original Research
The torsion as observable of electromagnetic field interacting with matter is studied under geometrical invariance and its corresponding energy spectra, using in this last, an adaptation of censorship device of matter for Hall Effect sensor considering the kinematic invariance of the particle in movement. After are developed and obtained some application of studied field torsion.
American Journal of Electrical and Electronic Engineering. 2020, 8(4), 108-115. DOI: 10.12691/ajeee-8-4-2
Pub. Date: September 01, 2020
5472 Views541 Downloads
by Yuqi Pang, Xiaotian Xu, Xunyu Liu and Xinyuan Zhang
Original Research
Dynamic voltage restorer (DVR) is a series compensation device with energy storage device, which can compensate reactive power and active power. DVR is composed of power module, action module, control module and sampling module. The core of the research lies in its topology and control strategy. This paper starts from the above two aspects, studies the working principle and structural characteristics of the dynamic voltage restorer, and analyzes the topological structure and the function of the structure of the dynamic voltage restorer. A voltage and current double closed-loop control strategy is proposed, which can effectively compensate the transient voltage. A DVR model is built in Matlab/Simulink, and power failure and three-phase short circuit are simulated. A double closed-loop control strategy based on voltage and current is applied. The simulation results show the feasibility and effectiveness of the control strategy.
American Journal of Electrical and Electronic Engineering. 2020, 8(4), 102-107. DOI: 10.12691/ajeee-8-4-1
Pub. Date: August 23, 2020
4571 Views524 Downloads