Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Department of Electrical Engineering

This paper focuses on control design of three phase neutral point clamped multilevel inverters (NPC-MLI) interconnected with PV array to the existing grid together equipped with boost converter. To achieve synchronized pulse width modulation and nominal harmonic performance space vector modulation (SVM) is adopted. The controller method of feed forward as well as integrator anti-windup is adopted for the proportional integral (PI) controllers to minimize the degradation problem. The synchronization and stability of the tracking performance of the controllers are verified by the bode diagram. In the proposed method harmonic current from filter capacitance is tracked and transformed to dq controller to reduce the total harmonic distortion (THD). Different three phase transformer-less inverter topologies with the proposed controller are compared with the traditional method. The reliability of the converters is determined by the thermal behavior of the semiconductor devices which equally affects the robustness and cost of the converters. Therefore a simulation platform is developed in a Matlab/Simulink and PLECS simulation environment to analyze the dynamics of the system. The controllers examine feasible option for three phase grid connected PV inverters. © 2015 Elsevier Ltd. All rights reserved © 2015 Elsevier Ltd. All rights reserved.

VIT Unitversity

School of Electrical Engineering

Vellore Campus

Department of Energy and Power Electronics

Journal of Building Engineering

Modeling and control strategy of three phase neutral point clamped multilevel PV inverter connected to the grid

This paper discusses the development of real-time simulation platform using digital signal processor (DSP) for photovoltaic (PV) system to study maximum power tracking algorithms in the laboratory. In this paper, PV module is simulated and deployed in TMS320F28335 to emulate the characteristics of PV at different temperature and irradiation with two DC voltage source. Further, maximum power point tracking (MPPT) of PV module with statistical method is developed. In order to evaluate the performance of the proposed MPPT control algorithm, the authors propose a real-time PV simulation system consisting of a PV module with a buck converter using a DSP and two DC voltage source to emulate the temperature and irradiation. Further, the proposed statistical MPPT is compared with the performance of the existing perturb and observe MPPT algorithm. Also, the performance of MPPT algorithms is tested with PV and a buck converter at different temperature and irradiation using hypothetical source. This scheme is validated with that of standard conditions given on the PV data sheet. This work may enable more researchers to study the integration of renewable energy sources and power electronics circuits at a low-cost without damaging the system. © Institution of Engineers Australia, 2015.

Department of Control and Automation

Australian Journal of Electrical & Electronics Engineering

Study and development of digital signal processor based real-time simulation platform for photovoltaic system with buck converter for maximum power tracking

Healthiness of a power transformer is very vital in today’s developing world for ensuring reliable and quality power supply to consumers. Transformer insulation fails mainly due to ingress of moisture and various traditional methods have been utilized to determine the moisture content in oil. Yet, identification of moisture which impregnates into the paper/ pressboard insulation or mechanical displacements of transformer windings due to accumulated short circuit forces during electrical faults, through a nondestructive technique is still a complex task. Polarization Depolarization Current (PDC) analysis is an emerging and a reliable technique with which these flaws can be clearly identified and can even be effectively discriminated (whether it is in oil or pressboard) while the conventional methods (like Breakdown Voltage Test on oil sample) identify moisture in oil only. In this research study an attempt has been made to develop a simplified insulation model of a transformer and an experimental setup is implemented for acquiring the PDC waveforms of the transformer model at different insulation conditions. The flaws have represented through their possible impacts on the dielectric capacitance and resistance of insulation. Careful analysis of the observed variations in PDC patterns indicate and signify the behavioral changes of the flawed transformer dielectric systems. © Research India Publications.

World University root node

International Journal of Applied Engineering Research

Polarization and depolarization current measurement – An effective technique for detection and analysis of mechanical displacement of transformer windings

In this paper a three phase two level Voltage Sourced Inverter based D-STATCOM and Dynamic Voltage Restorer (DVR) is used as the compensators for regulating the system voltage from sag. D-STATCOM and DVR, a shunt and a series based distribution side FACTS compensator, plays a major role in regulating the load voltage by injecting current and voltage respectively against the load parameter. A carrier based Space vector modulation technique is used for efficient utilization of DC bus Voltage. The performance comparison of both the devices is presented for resistive (R), resistive-inductive (RL) and motor load by simulation through MATLAB/Simulink software. © Research India Publications.

Performance of D-STATCOM and DVR on system voltage regulation by SVPWM technique

As global energy problem is becoming more significant, energy companies worldwide are resorting Time of Use (ToU) tariff. The project aims at developing a smart Home Energy Management System (HEMS) that helps consumers to manage their loads according to the time of use tariff system and in turn help in bringing down the cost incurred. RFID (Radio Frequency Identification) is the method chosen to identify the devices plugged in at home and this information is displayed on a mobile application. When the rates of energy consumption are high during particular periods during the day, the smart HEMS notifies the user through the mobile application about the energy being consumed during higher tariff periods and the corresponding cost incurred. © Research India Publications.

Smart home energy management system

Today a significant growth is observed in the manufacturing of composite materials. Intensively developed polymer composite materials (PCM) are used in different sectors of industry and technology. They are successfully replacing traditional construction materials and also permit the conditions that exclude use of metals. By industrial production of basalt fibers on the basis of new technologies their cost is equal and even less than cost of glass fiber, moreover basalt fibers and materials on their basis have the most preferable parameter, a ratio of quality and the price in comparison with glass &amp; carbon fibers, and other types of fibers. Though Basalt fiber has good wear resistance still increasing the wear resistance, decreasing friction coefficient, and increasing the hardness also gives more applications to basalt fiber like car brakes, interior decorations, car headliner, etc. more over increase in basalt fiber's tensile strength will give more applications to basalt fiber like bridges, underground tunnels, etc. From the results, it can be concluded that adding titanium oxide, silicon carbide and barium sulphate to the fiber matrix shows the increase in the above said properties, thus the above said mixture are added to the basalt fiber. The previous literature survey shows that adding titanium oxide, silicon carbide and barium sulphate to the fiber matrix shows the increase in the above said properties, thus the above said mixture are added to the basalt fiber. The tensile test will be conducted as per the ASTM standards on the Instron machine, the impact testing will be done on the charpy impact testing machine and the hardness testing will be conducted on the Rockwell hardness machine. © 2015, Sphinx Knowledge House. All rights reserved.

Department of Design and Automation

School of Mechanical Engineering

International Journal of ChemTech Research

Prediction of tensile strength on hybrid composite of basalt fiber with titanium oxide, barium sulphate and silicon carbide

This article deals about reduction of power drawn from the supply system in smart grid environment during un-certainties in the power generated by the source. Supply system in this work consists of an intermittent power source and a storage system, to support whenever there is deficit in power generation by the renewable generator. A micro grid systemis considered for thestudy which has critical and non-critical load present in it along with storage system and Electric spring. An attempt is made to study the performance of Electric spring in reducing the power drawn from the supply system under different non-critical loads during un-certainties or power deficit conditions of the source. The effect of reactive component in the non-critical loadis examined separately for the considered battery storage system. All the simulation models have been developed in MATLAB.

International Journal of Renewable Energy Research

Performance analysis of electric springs in reducing the power drawn from supply system during generation uncertainties

This exertion explains the method to improve the efficiency of photovoltaic based dynamic voltage restorer (DVR) used for reduction of voltage sink and other transients in Power distribution. Local grid Model with DVR powered from Photo Voltaic (PV) system and Zeta Inverter is developed. The Zeta inverter with reduced number of switches enhances the efficiency of DVR by effectively removing the harmonic distortion in the distribution voltage profile. In order to enhance the effectiveness of the PV system, perturb and observe (P&amp;O) algorithm based Maximum Power Point Tracker (MPPT) is connected. This Proposed system is modeled and simulated by MATALB Simulink. The replacement of conventional Voltage Source Converter or multilevel inverter by Zeta inverter in DVR improves the system performance and yields a cost effective solution for power quality enhancement. ï¿½ Research India Publications.

Efficiency enhancement of PV based dynamic voltage restorer using Zeta converter

This paper presents an approach to the application of Support Vector Machines (SVM) in estimating market power with the perspective of generation companies (Gencos). By choosing proper attributes and criterion for classification, SVM can be effectively used as a tool for market power estimation in the deregulated electricity market. In this paper, an analysis has been made to infer how effective the SVM technique is in predicting whether market power can be exercised by an entity or not. The person who is handling the technique i.e. Gencos decides the attributes chosen and the classifying criterion. Nodal Must Run Share Index is used in estimating market power. A simple three bus system with two generators and one load/two loads is chosen for the study. Performance of both linear and non-linear kernels is also compared. © Springer India 2015.

Lecture Notes in Electrical Engineering Power Electronics and Renewable Energy Systems

Application of SVM as Classifier in Estimating Market Power Under Deregulated Electricity Market

Herein, we suggest a simple chemical precipitation method for the preparation of bare and different levels of Zn doped MnO2  nanoparticles as electrodes for supercapacitors.