Browsing by Author "R.K. Saket"

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A Unified mode transition between Grid-tied and Islanded modes in a RBVSG using Uninterrupted Switching Scheme
(Institute of Electrical and Electronics Engineers Inc., 2023) Sameer Kumar Behera; Anup Kumar Panda; N. Venkataramana Naik; R.K. Saket
This article presents a three-phase single-stage photovoltaic energy conversion system (PECS) that connects residential buildings (RB) to the power grid. Unlike the traditional use of RBs as power consumers, this system treats RBs as power generators. However, PECS lacks inertia, making integrating with the power grid challenging. Addressing the issue, the virtual synchronous generator (VSG) technique is used to add inertia to the PECS-based system. The main focus of the article is to enhance the grid's interactivity by introducing Residential Building Virtual Synchronous Generators (RBVSG). RBVSG is tested under distorted grid voltage and varying load conditions, proving its ability to provide distortion-free, balanced grid currents with adjustable power factor while maintaining power quality. In low solar power availability, RBVSG continues to enhance power quality and imports power from the utility grid to meet local demands. Furthermore, under such conditions, the PECS power reduces or has a huge deviation in voltage; the dc-link voltage adjusts adaptively by following the variations in grid voltage, thereby increasing RBVSG system reliability and reducing operating losses. The system's efficacy is checked in MATLAB/Simulink platform and experimentally validated by a laboratory prototype. © 2023 IEEE.
Design and characteristics investigation of novel dual stator pseudo-pole five-phase permanent magnet synchronous generator for wind power application
(Institute of Electrical and Electronics Engineers Inc., 2020) Raja Ram Kumar; Priyanka Devi; Chandan Chetri; Aanchal Singh S. Vardhan; Rajvikram Madurai Elavarasan; Lucian Mihet-Popa; R.K. Saket
The main focus of this paper is to design and assess the characteristics investigation of Novel Dual Stator Pseudo-Pole Five Phase Permanent Magnet Synchronous Generator (NDSPPFP-PMSG) for wind power application. The proposed generator has a dual stator and two sets of five phase windings which enhance its power density and fault tolerant capability. The novelty of this generator is based on the fact that, eight magnetic poles are formed using only four poles of actual magnets on both the surfaces of the rotor. For the designing and optimal electromagnetic performance of the proposed generator, a Dynamic Magnetic Circuit Model (DMCM) is reported. To validate the results obtained from DMCM, Finite Element Method (FEM) has been opted owing to its high accuracy. For showing the performance superiority, the proposed generator is compared with two conventional generators namely, Dual Stator Embedded-Pole Five Phase (DSEPFP) and Single Stator Single Rotor Five Phase (SSSRFP) PMSG. To compare their performances, FEM results are considered. The electromagnetic performance namely, generated Electromotive Force(EMF), percentage(%) Total Harmonic Distortion(THD) of generated EMF, generated EMF vs speed, terminal voltage vs load current, electromagnetic torque developed on rotor vs time, %ripple content in the torque, and %efficiency vs load current are investigated for all the three generators. From these investigations, it is found that the power density (power to weight ratio) of the proposed generator is maximum. © 2020 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.
Design modification in single-tooth winding double-stator switched reluctance motor for torque ripple mitigation
(Institute of Electrical and Electronics Engineers Inc., 2021) Tripurari Das Gupta; Kalpana Chaudhary; Rajvikram Madurai Elavarasan; R.K. Saket; Irfan Khan; Eklas Hossain
Double-stator switched reluctance motors (DSSRMs) with single-tooth winding topology possesses high torque density when compared to conventional switched reluctance motors (SRMs). However, their inherent high torque ripple is still an issue for industrial applications. In SRMs, the torque shared by the outgoing phase reduces significantly in the commutation region. However, at the same time, the incoming phase does not achieve sufficient torque generation. This results in a high torque ripple in this region. In this paper, several design procedures are discussed to improve the performance of the radial flux DSSRM with single-tooth winding topology. Firstly, the pole arc equations of stator pole and rotor segments for the higher difference between aligned and unaligned inductance are derived for high output torque and based on this, the selection of the number of stator slots/rotor segments is discussed. Furthermore, the influence of winding polarities on the core loss and output torque of DSSRM is discussed. Finally, the design modification in rotor structure is proposed with an angular shift in the alternate rotor segments in the direction of rotation to mitigate the torque ripple. To investigate the effectiveness of the proposed design modification, a finite-element model of a 3-phase 12/10/12 pole radial flux DSSRM is developed in ANSYS/MAXWELL software, and simulation results are presented. It is observed that a 40% reduction in the torque ripple is achieved in the case of the proposed motor. The proposed design modification improves the torque generating capability of the incoming phase in the commutation region, which reduces the torque dip in this region and subsequently reduces the torque ripple. © 2013 IEEE.
Improved Stability Criteria for Time-Varying Delay System Using Second and First Order Polynomials
(Institute of Electrical and Electronics Engineers Inc., 2020) Sharat Chandra Mahto; Rajvikram Madurai Elavarasan; Sandip Ghosh; R.K. Saket; Eklas Hossain; Shyam Krishna Nagar
This article concerns the problem of stability analysis of systems with time-varying delay. Recent developments in this direction involves approximation of a second order polynomial function of time-delay. This article proposes a new Lyapunov-Krasovskii Functional that does not introduce the second-order polynomial and thereby avoid the approximation involved in obtaining the stability criterion. Two stability criterion are presented, one introduces the second-order polynomial and the other one does not. A comparison using numerical examples shows that the avoidance of second-order polynomial formulation leads to improved results. © 2013 IEEE.
Performance Analysis of Single-Stage and Two-Stage VSI-Fed Induction Motor Drives for Solar Water Pumping Applications
(Institute of Electrical and Electronics Engineers Inc., 2024) Jyoti Maurya; R.K. Saket; R.K. Srivastava
This paper describes a comparative performance analysis of single-stage and two-stage voltage source inverter (VSI) fed induction motor (IM) drive for water pumping systems used in agricultural applications. The comprehensive analysis with illustrative descriptions of proposed research is conducted to evaluate the system's economic viability for a solar pump based irrigation system. These two setups share common components, including photovoltaic (PV) system, battery with bidirectional converter and VSI-fed IM drives with pump load. In both configurations, incremental conductance (INC) maximum power point tracking technique (MPPTT) is employed to extract maximum power from the PV array. In two stage system, a DC/DC boost converter is integrated to elevate the input voltage for VSI and meet the system's load requirements. On the other hand, in single-stage system, PV array is directly connected to VSI, which provides power to entire IM drive integrated with pump. A direct torque control (DTC) strategy is utilized for speed regulation of IM drive in both setups, ensuring that the characteristics of PV array-fed IM drive with pump load are maintained. An insightful efficiency versus load analysis has been presented for power electronics system and IM drive, which shows comparative efficiency and thermal characteristics between both configurations, shedding light on optimal system design for enhanced performance. Typhoon HIL 404 software is used for modelling and simulation of the systems. The real-time hardware results have been taken by using HIL Device and 4 Series B mixed signal oscilloscope (MSO) for validation of the simulation results. The comparative performance analysis, graphical illustrations and performance descriptions between a single-stage PV fed IM drive and two-stage PV fed IM drive are described in simulation results and experimental validation sections. © 1972-2012 IEEE.
Performance Enhancement of STATCOM Integrated Wind Farm for Harmonics Mitigation Using Optimization Techniques
(Springer Science and Business Media Deutschland GmbH, 2021) Mohamed Hamdy; Mahmoud A. Attia; Almoataz Y. Abdelaziz; Sachin Kumar; Kumari Sarita; R.K. Saket
Renewable energy generation is growing every day all over the world. This injects the grids with harmonics and increases the total harmonics distortion of the systems. In the other hand, Flexible AC transmission systems (FACTS) are used in the different power systems for the enhancement of the stability of these systems. In this paper, Flexible AC transmission systems (FACTS) shall be used not for the enhancement of the stability of the system as usual, but to mitigate the harmonics of the system and decrease the Total harmonics distortion (THD). The Static Synchronous Compensator (STATCOM) performance is compared using The Harmony Search Optimization Algorithm (HSA) and the Invasive Weed Optimization (IWO) trying to achieve better results. MATLAB/SIMULINK is used to create a power system model of wind generation system and then is used to compare the two techniques. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
Power system components modelling and reliability evaluation of generation capacity
(Inderscience Publishers, 2009) R.K. Saket; R.C. Bansal; Gurmit Singh
This paper describes a methodology based on safety factor concept and peak load considerations for a reliability evaluation of a generation system. This paper also refers to major research papers presented for the evaluation of reliability of power systems, reliability indices and modelling of power system components. Load models are considered as a straight line and a stepped load duration curve is used for reliability evaluation of system using Simpson's 1/3rd rule. The probability of load exceeding the generating capacity has also been considered in Loss of Load Probability (LOLP) evaluation. Copyright © 2009, Inderscience Publishers.
Predicting solar power potential via an enhanced ANN through the evolution of cub to predator (ECP) optimization technique
(Springer Science and Business Media Deutschland GmbH, 2024) Morteza Azimi Nasab; Mohammad Zand; Mohsen Miri; P. Sanjeevikumar; Josep M. Guerrero; R.K. Saket; Bassem Khan
Forecasting plays a vital role in solar power generation and skillfully managing renewable energy resources. The traditional artificial neural network (ANN) has certain limitations with its pre-defined network structure in predicting solar power potential and not suitable because traditional ANN must be configured. Configuring the ANN model is time-consuming through manual process or trial and error. Therefore, this work evaluates the combination of different optimization techniques for ANN model configuration. In other techniques, the forecast performance is between 84.9 and 91.6% on average. Experience in handling the traditional methods helps develop a novel evolution of cub to predator (ECP) optimization technique. The investigation revealed that incorporating optimization results in superior performance over the traditional ANN, whereas the proposed ECP unveils 97.2%, which is an excellent result of contest optimization techniques. At the same time, the proposed model with the lowest MSE = 0.0029, and MRE = 0.0809. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.