Faculty Publications

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Author: search.filters.author.Vinatha Urundady, V.

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    Grid integration of wind and photovoltaic hybrid energy system
    (Universitatea Politehnica din Timisoara blucretiu@yahoo.com, 2014) Vinatha Urundady, V.; Vittal, P.K.
    Hybrid energy system usually consists of two or more renewable/nonrenewable energy sources. Currently hybrid systems involving wind power as one of the constituent along with fuel cell and/or photovoltaic power are more appealing. The main purpose of such hybrid power systems is to overcome the intermittency and uncertainty of wind energy and to make the power supply more reliable. Hybrid wind power with fuel cell can avoid the drawback of wind power intermittency, since fuel cell can act as an energy barrier and adjust the power output effectively. Wind power and solar energy can be combined into a hybrid system, especially for the power supply for remote areas where the cost of transmission line is too high. Another advantage of this kind of hybrid system is that they are both renewable energies, which is compatible to the environment. In order to deliver the stable power to the load, a substantial battery bank is needed, which enhances the size of the system, cost and also causes environmental pollution. The deployment of battery can be avoided by directly connecting the hybrid system to the grid. The work presented in this paper consists of modeling and simulation of wind and photovoltaic hybrid energy system inter-connected to electrical grid through power electronic interface. The power conditioning system is implemented to control power electronic circuits and system performance is evaluated for different input power levels and load variation.
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    Power control strategy for grid connected permanent magnet synchronous generator of a distributed generation unit
    (Inderscience Enterprises Ltd., 2014) Vinatha Urundady, V.; Vittal, P.K.
    This paper describes the studies on the operation and control of a variable speed wave energy conversion system. The wave energy conversion system considered is oscillating-water-column (OWC) based Wells turbine driven permanent magnet synchronous generator connected to the grid by means of fully controlled frequency converter. In such systems primary aim is to achieve a low distortion, high power quality power export from the converter with the objective to regulate the power flow or power factor optimisation. In this paper wave energy conversion system is modelled and control schemes are implemented for regulating the dc link voltage for varying input conditions and for regulating the grid current entering the distribution network and hence the power flow into the grid. Response of the system is investigated under steady state, dynamic and transient conditions. In each case the grid current distortion and the dynamic performance of the converter control schemes are evaluated. © © 2014 Inderscience Enterprises Ltd.
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    One-Cycle Controlled Bridgeless SEPIC with Coupled Inductors for PAM Control-Based BLDC Drive
    (Springer Verlag, 2019) Prabhu, P.; Vinatha Urundady, V.
    This paper presents a novel approach for the speed control of BLDC motor for residential air conditioning application, using pulse amplitude modulation (PAM) control of voltage source inverter (VSI). PAM control of VSI is accomplished by using a bridgeless SEPIC converter embedded with coupled inductors at the front end and adopting one-cycle control (OCC) technique in the inner voltage control loop. The DC reference voltage required for inner voltage control loop is obtained using a PI controller in the outer speed control loop and speed feedback signal. The PAM control (DC supply voltage control) of VSI reduces switching losses by allowing the operation of VSI at fundamental frequency. Bridgeless SEPIC with coupled inductors is designed to enable PAM control for VSI and is operated in discontinuous conduction mode (DCM) for the complete range of DC link voltage. DCM operation simplifies power factor correction control scheme to a simple voltage follower approach, since it has inherent input current shaping feature. The introduction of coupled inductors in the bridgeless SEPIC converter lowers the overall count of components, allows better integration and lowers the requirement of inductance, compared to conventional bridgeless SEPIC. OCC which is a nonlinear control technique, used in the voltage control loop, enhances the performance with improved startup and transient state response. It also improves the quality of supply current drawn by reducing the distortion compared to PI control technique. The proposed BLDC motor drive is modelled and simulated using MATLAB/Simulink. The performance of proposed system is evaluated for a wide range of speed control. The experimental prototype for bridgeless SEPIC with coupled inductors is implemented. The inherent power factor correction for supply voltage variations is validated using the results. The bridgeless operation of the converter with coupled inductor configuration is also described with experimental waveforms at rated supply voltage of 220 V. © 2019, King Fahd University of Petroleum & Minerals.