Journal of Science Engineering Technology and Management Science

A simulation technique examined the quality output of a single phase PWM (pulse width modulated) voltage source inverter incorporated with series-parallel resonant inverter configuration. The output voltage and current harmonic contents helped evaluate the inverter performance both with and without filter implementation. Researchers have designed and tested two variations of single phase PWM inverter with an evaluated LLCC (series-parallel) filter. The inverter requires an RMS value controller as its subsequent element to secure steady output signals. The proposed work yields beneficial effects on inverters that need minimum THD percentages alongside high-quality AC output.

Keywords : Series parallel filter, THD, PWM inverter, and resonant inverter

Author : Raja Sekhar Reddy

Title : Evaluation of a Single-Phase Resonant Inverter's Quality

Volume/Issue : 2025;02(03)

Page No : 01-05

The project implements unified power quality conditioner (UPQC) power quality improvement devices for addressing the voltage and current quality issues of sensitive loads. The UPQC contains series and shunt converters that operate through a standard dc junction. The shunt converters cleanse the nonlinear load side of current harmonics and the series converters do the same for supply-side voltage sag. The researched technique of generating reference signals (phase-locked loop) provides a basis for developing controllers for series converters and shunt converters. The fuzzy-logic controllers form the basis for controlling the dc link operation. The new sag indication method outperforms the dq-transformed conventional approach. The control system includes a rapid detector for sags. MATLAB/SIMULINK serves as the platform to conduct simulated tests which validate the effectiveness of this proposed system.

Keywords : fuzzy-logic controller reference signal creation, active filter, UPQC or unified power quality conditioner

Author : Shanmukh

Title : Design and Simulation of a UPQC Based on a Phase-Locked Loop Controller with Nonlinear Loads

Volume/Issue : 2025;02(03)

Page No : 06-09

This document demonstrates the process of building a sector-independent Space Vector Modulation (SVPWM) system using a DSP processor in fundamental motor drive systems. The implementation of traditional space vector modulation proves complex because it includes extensive calculations. Before moving forward, it is essential to determine the magnitude of voltage vectors according to speed specifications and Volts/Hz data in software and hardware domains. Computing the phase angle and quadrant and sector determination enables the calculation of switching time segments based on decomposition matrices. This proposed algorithm dissipates all computational requirements that exist in traditional approaches. The closed loop control system achieves precise switching period control through fixed compare register values which it implements using the Volts/Hz principle. Through its built-in Space Vector Pulse Width Modulation hardware module, the TI TMS320LF2407A generates PWM pulses that include four switching states within one PWM period. The performance evaluation of the 4-hp induction motor supplied by IGBT-based inverter modules generated through DSP processor control pulses showed promising results.

Keywords : PWM Volts/Hz concept, Space vector, DSP processor, and Closed loop control

Author : Mohit

Title : A Basic DSP Processor-Based Sector-Independent Space Vector Modulation

Volume/Issue : 2025;02(03)

Page No : 10-13

The authors introduce an ac–dc front-end power factor correction solution for PHEV battery charging operations. The system design enables accurate dc output delivery and minimizes harmonic content in the ac input and improves power quality through power factor regulation. The research introduces a boost converter topology which operates in continuous conduction mode to minimize significantly input current harmonics. The system achieves digital power factor correction by implementing control functions through an inexpensive digital signal controller. The research continues with theoretical and experimental implementation of the suggested converter and its control methodology through digital control system development. A detailed approach for converter operation and universal ac input voltage control from 150–340V to produce 480V dc output at 5.0 kW load is described using both theoretical and experimental measurement data with a power factor surpassing 0.84. Experimental findings show that the new control approach provides plug-in hybrid electric vehicle (PHEV) battery charging applications with both advantageous features and operational flexibility.

Keywords : Microcontroller, fuzzy logic, hybrid electric car, Power factor adjustment and power converter

Author : Sneha Reddy

Title : Plug-In Hybrid Electric Vehicle Battery Chargers Using a Single Phase PFC Converter

Volume/Issue : 2025;02(03)

Page No : 14-17

Wide variations in load torque are experienced by process equipment with more demanding duty cycles. Torsional oscillations are a drawback of these, which frequently require a large flywheel for torque equalization. As a result, mechanical power transmission components become worn out, which eventually leads to equipment failure and extended, frequent downtime, which costs money. This article suggests a more straightforward and suitable substitute. Low moment of inertia and properly monitored VVVf drives provide a far superior option for significantly enhancing system behavior. The VVVf control-system enables power input management to the main electric drive which results in nearly identical demand torque output. The torque matching can be enhanced by employing a smaller flywheel. The presented study calculates the minimum requirement for flywheel moment of inertia to reduce the supply torque gap relative to the required torque characteristics. The energy calculations focus on the net transactions between all the components. The flywheel must absorb and release the same quantity of energy through one complete torque variation cycle.

Keywords : VVVf-drives, flywheels, process machines, and demand torque characteristics

Author : Lakshmi Rai and Satish Naidu

Title : Bulky Flywheel with a Smaller Flywheel and a Controlled Motor

Volume/Issue : 2025;02(03)

Page No : 18-23

Variations in wind speed cause the wind turbine's produced torque to fluctuate, increasing turbine blade fatigue and electric machine overloads. This study examines how changing the rotor resistance affects the rotor current control of a wind turbine-powered wound rotor induction generator in various operating modes. The machine's turbine produces a steady thrust by measuring and regulating the rotor current. Wind speed changes, particularly at high wind speeds, are the modes under study. Additionally, the impact of the suggested control on critical fault clearing time and short circuit is examined. Pitch regulator chores will be relieved, the machine will start softly, and torque and power variations will be decreased with this strategy.

Keywords : Generator, Wind energy conversion, Wound rotor induction, Rotor resistance control

Author : Mohini

Title : Wound Rotor Induction Generator on the Efficiency of the Wind Turbine

Volume/Issue : 2025;02(03)

Page No : 24-30