Hasil untuk "Electrical engineering. Electronics. Nuclear engineering"

John A. Adebisi, Leokadia N.P. Ndjuluwa

Ramin Barati

Faculty of Electrical and Electronics Engineering, Vinh Long University of Technology Education, Vietnam, Loc Phuoc Nguyen, Hiếu Thanh Bùi et al.

Multi-level inverters have drawn much intention from researchers and industry, in which 3-level inverters have been widely used in practice. One of the most interesting issues is to increase the number of levels to achieve higher performances such as large power, high voltage and low harmonic distortion. Basic multilevel inverter configurations such as neutral point clamping diodes, flying capacitor clamping, and cascaded inverters have their own disadvantages when increasing the number of levels. To overcome these problems, different hybrid multilevel inverters have been proposed. As results, there are a lot of five-level hybrid inverters designed for practical applications. This paper proposes a new hybrid 5-level neutral point clamped inverter by adding auxiliary DC source. The novel hybrid inverter shows its performances comparable to the ideal NPC inverter fed by 4 ideal DC sources, and requires hardware simpler than cascaded and flying multilevel inverters. It has a good ability of self-balancing of the voltages across the DC capacitors. Consequently, simple and effective PWM control strategies can be utilized that enables achieving high working performances. The paper content consists of analyzing of the proposed hybrid inverter configuration, investigating the voltage balance on the DC capacitors, validating control characteristics and studying output performance when applying the carrier based pulse width modulation control. The analysis and characteristics of the proposed configuration are verified through simulation results using MATLAB/SIMULINK.

Gang Li

Associate Professor,Department of Electrical and Electronics Engineering, Kumaraguru College of Technology Coimbatore, T.N. India., D. Rajalakshmi, R. Kavitha et al.

Induction furnaces are widely applied for heating and melting purpose in Iron and steel industries. Induction furnace injects significant amount of harmonics when operated under varying load conditions.This leads to power loss and affects the performance of adjacent loads. The aim of the paper is to analyze the harmonic profile of induction furnace in steel industry and suggest solution to mitigate the harmonics using a Unified Power Quality Conditioner (UPQC). The experimental voltage and current harmonics of the induction furnace are analyzed using power quality logger for a steel industry. From the experimental analysis, simulation is performed in MATLAB/SIMULINK and solutions are presented to mitigate the harmonics using UPQC.

SHARMA NITIN, Undergraduate Scholar, Department of Electrical and Electronics and Communication Engineering, DIT University, Uttarakhand, India., KHARE SHIVANG JITENDRA et al.

S Choudhary, S Qureshi