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S. Krithiga

Bio: S. Krithiga is an academic researcher from VIT University. The author has contributed to research in topics: Photovoltaic system & Inverter. The author has an hindex of 7, co-authored 22 publications receiving 346 citations. Previous affiliations of S. Krithiga include National Institute of Technology, Tiruchirappalli.

Papers
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Journal ArticleDOI
TL;DR: In this article, a fuzzy logic controller has been developed for interfacing PV array with utility grid through a three-phase line-commutated inverter for the first time.

139 citations

Journal ArticleDOI
N. Sujitha1, S. Krithiga1
TL;DR: In this paper, a review on different power converter topologies which can be used in PV-EV and WTG-EV battery chargers is presented, and various power converters that can be employed for interfacing the battery charger with the utility grid.
Abstract: Electric Vehicles (EV) are emerging due to ever increasing concerns on the energy issues and greenhouse gas effects. Also, due to the depletion of fossil fuels, electricity generated from Renewable Energy Sources (RES) like Photovoltaic (PV) arrays and Wind Turbine Generators (WTG) are used for charging the EV batteries which reduces the utility grid overload. A review on different power converter topologies which can be used in PV-EV and WTG-EV battery chargers are presented in this paper. Also, this paper reviews the various power converters which can be employed for interfacing RES-EV battery charger with the utility grid. This paper enlightens the researchers in the selection of appropriate power converters suitable for the stand-alone and grid-connected RES-EV battery charging systems.

83 citations

Journal ArticleDOI
TL;DR: In this paper, a simple photovoltaic (PV) system capable of operating in both grid-connected mode and stand-alone mode using multilevel boost converter (MBC) and line commutated inverter (LCI) has been developed for extracting the maximum power and feeding it to a single phase utility grid and single-antenna system simultaneously.
Abstract: A simple photovoltaic (PV) system capable of operating in both grid-connected mode and stand-alone mode using multilevel boost converter (MBC) and line commutated inverter (LCI) has been developed for extracting the maximum power and feeding it to a single phase utility grid and stand-alone system simultaneously. Theoretical analysis of the proposed system is done and the duty ratio of the MBC is estimated for extracting maximum power from PV array. For a fixed firing angle of LCI, the proposed system is able to track the maximum power with the determined duty ratio which remains the same for all irradiations. This is the major advantage of the proposed system which eliminates the use of a separate maximum power point tracking (MPPT) controller. Experiments have been conducted on a 80 V, 9.4 A PV array feeding a 110 V single phase grid and a 230 V, 100 W DC motor. The MBC extracts maximum power from the PV array and feeds the major portion of power to the single phase utility grid via LCI and the remaining power to separately excited DC motor. It was found that the theoretical analysis, simulation and experimental results closely correlate with each other and proves the effectiveness of the proposed configuration.

66 citations

Journal ArticleDOI
TL;DR: Compensation circuit topologies, types of core for magnetic coupled inductors, different converters and controllers used for wireless power transfer (WPT) system, design aspects of an static wireless EV battery charging system along with its equivalent circuit analysis is presented.
Abstract: Abstract Electric vehicles (EV) are found to be a good alternative for the conventional internal combustion (IC) engine vehicles in transportation sector due to its various advantages. Now-a-days, wireless charging of EV battery is preferred among the various methods used for charging EV battery. In this paper, extensive review is carried out on various methods used for wireless charging of an EV battery. Different techniques used for transferring power in wireless mode to charge the EV battery are static EV charging technique and dynamic EV charging technique. Static wireless EV battery charging technique adopts inductive and capacitive method for transferring power whereas, dynamic wireless EV battery charging technique adopts only inductive method for transferring power. These techniques are discussed thoroughly in this paper and broad review is carried out with a focus on the compensation circuit topologies, types of core for magnetic coupled inductors, different converters and controllers used for wireless power transfer (WPT) system. Also, design aspects of an static wireless EV battery charging system along with its equivalent circuit analysis is presented in this paper. Challenges and future development in wireless charging of EV battery is also explained in this paper.

30 citations

Proceedings ArticleDOI
07 Mar 2011
TL;DR: In this article, the authors proposed a new adjustable speed drive (ASD) system based on the high-performance Z-source inverter, which eliminates the possibility of the DC-link voltage aberrances; simplify the Zsource network inductor and controller design.
Abstract: A new adjustable-speed drives (ASD) system based on the high-performance Z-source inverter. It can overcome limitations of conventional Z-source inverter system. The proposed system can operate at wide range load with small inductor. It eliminates the possibility of the DC-link voltage aberrances; simplify the Z-source network inductor and controller design. It increase the inverter modulation index M and decrease the ripple current by changing the magnitude and distribution of the harmonics and then decrease the iron loss of the motor. The IGBT switch is controlled in such a way that it is in off state when inverter is in shoot-through state and switch is in on state when inverter is in non-shoot through state. The v/f ratio is maintain constant to maintain DC link voltage constant and control the modulation index of PWM gate pulses of the inverter. The operating principle and analysis has been carried out and proposed model is simulated. The simulation result verifies the validity of the proposed high-performance Z-source inverter adjustable speed drives system.

20 citations


Cited by
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01 Jan 1992
TL;DR: In this paper, a multilevel commutation cell is introduced for high-voltage power conversion, which can be applied to either choppers or voltage-source inverters and generalized to any number of switches.
Abstract: The authors discuss high-voltage power conversion. Conventional series connection and three-level voltage source inverter techniques are reviewed and compared. A novel versatile multilevel commutation cell is introduced: it is shown that this topology is safer and more simple to control, and delivers purer output waveforms. The authors show how this technique can be applied to either choppers or voltage-source inverters and generalized to any number of switches.<>

1,202 citations

Journal ArticleDOI
TL;DR: In this article, a state of the art review on various maximum power point techniques for solar PV systems covering timeworn conventional methods and latest soft computing algorithms is presented to date critical analysis on each of the method in terms of tracking speed, algorithm complexity, dynamic tracking under partial shading and hardware implementation is not been carried out.
Abstract: In recent years solar energy has received worldwide attention in the field of renewable energy systems Among the various research thrusts in solar PV, the most proverbial area is extracting maximum power from solar PV system Application dof Maximum Power Point Tracking (MPPT) for extracting maximum power is very much appreciated and holds the key in developing efficient solar PV system In this paper, a state of the art review on various maximum power point techniques for solar PV systems covering timeworn conventional methods and latest soft computing algorithms is presented To date critical analysis on each of the method in terms of (1) tracking speed, (2) algorithm complexity, (3) Dynamic tracking under partial shading and (4) hardware implementation is not been carried out In this regard the authors have attempted to compile a comprehensive review on various solar PV MPPT techniques based on the above criteria Further, it is envisaged that the information presented in this review paper will be a valuable gathering of information for practicing engineers as well as for new researchers

358 citations

Journal ArticleDOI
TL;DR: A modified incremental conductance algorithm is proposed that responds accurately when the solar irradiation level increases and shows zero oscillation in the power of the solar module after the maximum power point (MPP) is tracked.

356 citations

Journal ArticleDOI
TL;DR: The results indicate that, FLC performed best among compared MPPT techniques followed by P&O, INC, and, HC MP PT techniques in both dynamic response and steady-state in most of the normal operating range.

355 citations

Journal ArticleDOI
TL;DR: The near optimum design for membership functions and control rules were found simultaneously by genetic algorithms (GAs) which are search algorithms based on the mechanism of natural selection and genetics which are easy to implement and efficient for multivariable optimization problems such as in fuzzy controller design.

240 citations