http://10.9.150.37:8080/dspace//handle/atmiyauni/323 2026-04-27T18:50:45Z http://10.9.150.37:8080/dspace//handle/atmiyauni/2296 Title: Virtual Inertia Issue and its Mitigation Technique in Integration of Renewable Energy with Grids Authors: Kathad, Shilpa Keshubhai; Pandya, Dharmesh J. Abstract: The penetration of Renewable Energy Sources (RESs) into microgrids is gaining huge significance in recent times. RESs are integrated with conventional grid systems to meet the growing energy demand and to enhance the power quality. The increasing penetration of RES into the grid system affects the stability of frequency in microgrids due to the stochastic nature of photovoltaic (PV) and wind energy generation. Unlike in traditional power generation systems, the lack of rotational inertia in microgrids is one of the critical concerns which affects the integration of RES with the grid system through power electronic converters. This introduces more uncertainties into the system and hence the operation and control of such a system becomes more complicated. In order to maintain the stability of microgrids and to effectively utilize RESs and distributed generation (DG) systems, it is essential to control virtual inertia. Proper inertia control improves the flexibility of microgrid operation and as a result various controlling strategies have been proposed in the past to control the virtual inertia. This work presents a new virtual inertia control (VIC) approach with a multi power level controller (MPLC) for RES integrated microgrids. Considering the high-level penetration of RES, the proposed approach is designed to enhance the system performance under sudden load variations and frequency variations. The efficiency of the proposed control approach is validated with and without MPLC. Results show that the controller achieves better frequency stability with MPLC. Advanced control algorithms can be used to create virtual inertia, which can mimic the stabilizing effect of traditional rotating mass in conventional power systems. An interconnected power framework's complete framework inertia might be impressively decreased because of a sharp ascent in utilization of renewable energy sources (RESs) based on force converter, making a framework more vulnerable to framework instability. This work recommends another use of virtual inertia control to further develop recurrence dependability of the connected power framework because of high entrance level of RESs. We present the subsidiary control approach, expected for more significant level virtual inertia imitating applications. The suggested virtual inertia control circle has a second-request hallmark that further enhances recurring dependability and strength. Δf values differ between 17.4215 and 20.3621 with significant frequency variations due to conventional control. Equally, virtual inertia control exhibits a high level of efficiency in reducing frequency deviations; The Δf values were consistently smaller between 0.0236 and 0.0369 than the conventional control. 2024-07-01T00:00:00Z http://10.9.150.37:8080/dspace//handle/atmiyauni/1409 Title: A Novel fault-tolerant structure for a single-phase seven-level cascaded Hh bridge multilevel inverter Authors: Patel, Monika Devrajbhai; Dr. Dharmesh, J. Pandya Abstract: Cascaded H-bridge multilevel inverter (CHBMLI) is the most popular topology for high power and high voltage applications. There are total 4m numbers of power electronic switches in a CHBMLI having m numbers of modules (m2). Because of higher number of switches; the possibility of faults in switches is more. A CHBMLI is said to be “reliable”; if it continues delivering output voltage; even after fault in switches of m-1 number of modules. A fault-tolerant structure is proposed for CHBMLI having 3 modules. Wherein; any 1 out of 3 modules gets faulty; the remaining 2 healthy modules will continue delivering output voltage with the same amplitude and the same voltage level as in case of normal operation having all the 3 modules are healthy. When any 2 out of 3 modules get faulty; the remaining 1 healthy module will continue delivering output voltage with the same amplitude and reduced voltage level. In this way, the proposed fault-tolerant structure of CHBMLI improves the system reliability by preventing the breakdown of the whole system till at least 1 module is healthy. 2023-12-20T00:00:00Z http://10.9.150.37:8080/dspace//handle/atmiyauni/1350 Title: Optimal Allocation of SVC TCSC and UPFC using Kinetic Gas Molecular Optimization and Cuckoo Search Algorithm Authors: Bhayani, Kishan Jivandas; Dr. Dharmesh, Pandya Abstract: Electrical power systems, which are controlled by electrical and mechanical systems, are critical components of modern society. Economic dispatch is a critical process in the operation of a power system that aims to allocate power generation to match load demand at the lowest possible cost while satisfying all generators and system constraints. The increasing use newlineof sensitive equipment in modern power systems necessitates a strong emphasis on power newlinequality. Quality issues such as voltage sags, swells, surges, interruptions, and harmonic newlineproblems cause significant economic loss in the power industry and necessitate immediate newlineaction. FACTS (Flexible Alternating Current Transmission Systems) can manipulate and newlineimprove the fundamental components of an electrical system used in conveyance to ensure the newlinereliable and stable operation of the power system. The FACTS device solves critical issues such newlineas voltage stability, line overloading, power loss, power flow, and so on. The FACTS device is newlineimportant in improving power system operations, whether static or dynamic, and requires a newlinecapital investment. As a result, the FACTS device can be optimized in terms of position and size to improve the performance of the power system. In the power system, four different FACTS devices such as series, shunt, combine series and shunt, combine shunt and series newlinedevices are selected to place in suitable locations to raise the voltage level and reduce power losses. The effects of FACTS devices on various bus network parameters such as generation cost, power loss, and voltage stability, among others, are assessed. To reduce power loss and maintain a voltage level, the FACTS devicesand#39; size and location must be improved. Voltage instability has recently been identified as a critical issue in the transmission line system due to its dynamic load pattern and increasing load demand. Flexible AC Transmission Systems newline(FACTS) devices are used to reduce voltage instabilities by controlling real and reactive power via the transmission line system. 2023-01-31T00:00:00Z