KARTHIKEYAN VASUDEVAN | Amet University (original) (raw)

Papers by KARTHIKEYAN VASUDEVAN

Circuits and Systems, 2016

In this paper, a Binary Coded Decimal (BCD) topology of modular multilevel inverter with reduced ... more In this paper, a Binary Coded Decimal (BCD) topology of modular multilevel inverter with reduced component count is proposed. For the control of this inverter, hybrid control strategy is used. The proposed modular multilevel inverter uses asymmetrical dc sources and reduced number of switches topology. This hybrid modulation technique uses the multicarrier based Pulse Width Modulation (PWM) and the fundamental frequency modulation strategy. The hybrid modulation algorithm is implemented with "NUC140" micro-controller. In comparison with the conventional and some of the recently reported inverter topologies, the proposed inverter topology is able to generate high number of voltage levels in the output by using minimum number of components such as dc sources, power switches and driver circuits. This inverter offers significant performance with less number of components. The feasibility of the proposed topology is confirmed by simulation and experimental results.

India, as part of its international commitments on climate change, is in rapid pace in the renewa... more India, as part of its international commitments on climate change, is in rapid pace in the renewable energy segment. India has set a goal to attain 100GW solar energy generation all the way through grid-tie solar PV system but out of which 40GW is planned to attain from roof-top solar PV systems by 2022. Roof-top solar PV system attain the familiarity due to different rewards like low development period, island mode operation and grid stability. This paper presents the study on the yield analysis of the 20kW on-grid roof-top solar photovoltaic unit installed at AMET Deemed to be University, Chennai, India. The data collected from this plant is used to calculate the annual energy generation and capacity factor. The study proves that, this 20kW grid-connected solar PV system achieve better performance record of energy generation over a year as 29.7MWh and the capacity factor of 17%.

In this paper, a 9-level symmetrical modified multi-level cascaded H-bridge inverter with reduced... more In this paper, a 9-level symmetrical modified multi-level cascaded H-bridge inverter with reduced switch count is considered. The operation and control of 9-level inverter is discussed. This multi-level inverter uses four symmetrical DC input sources and twelve unidirectional power semiconductor switches. The basic operation with equal width modulation and resistive and Resistive-Inductive loads are verified with the help MATLAB simulation. The simulation outputs are presented and confirm the operation of nine level inverter operations. Together with the traditional topologies and some other inverters, this inverter topology is capable to produce more number of output voltage levels by means of less number of power switches and driver circuits. Simulation results confirm the probability of this inverter topology

A Matlab/Simulink/SRDaS environment to simulate a 6/4-Switched Reluctance Motor is presented in t... more A Matlab/Simulink/SRDaS environment to simulate a 6/4-Switched Reluctance Motor is presented in this paper. The proposed simulation model of the Switched Reluctance Motor for its linear inductance profile is instigated. All simulations are completely documented by their block diagrams and corresponding Matlab functions. The developed simulation model results were compared with SRDaS software packaged SRM model and its performance were analyzed.

This paper investigates and analyses the phase disposition pulse width modulation (PDPWM) based R... more This paper investigates and analyses the phase disposition pulse width modulation (PDPWM) based Reduced Switch Reverse Voltage (RSRV) multi level inverter. This inverter has been designed with lesser number of components. Enhancement of output power quality using PDPWM is discussed with respect to the amplitude and frequency modulation index values. This PDPWM based 9-level inverter with reduced components and odd valued frequency modulation index value, produces better harmonic spectrum. All the lower order harmonics are well within the limit defined by the IEEE-519 standard. The simulation model of PDPWM based asymmetrical 9-level inverter with reduced number of components is built to validate its operation and the results are presented.

Now-a-days, solar energy is the alternate energy solution for many applications. It may be a isol... more Now-a-days, solar energy is the alternate energy solution for many applications. It may be a isolated standalone solar system to provide power to the inaccessible area or it may be grid connected system. The isolated solar PV system is forever connected to a storage device to store the excess power when the generated power output is more than sufficient. Whereas grid connected solar PV systems are more trustworthy. As the solar PV energy system is directly injected to the grid so a lot of issues arise during the interconnection because of intermittent nature of the input energy. The main reasons for fluctuations of power are change in irradiance and temperature. In this paper, simulation analyses as well as a case study are carried out to discover the effect of irradiance on the yield factor of the grid connected solar PV system.

The International Maritime Organization (IMO) sets protocols for marine vessels to insure safety ... more The International Maritime Organization (IMO) sets protocols for marine vessels to insure safety and prompt response to various demands. When it comes to an unmanned vessel it has been done with Proportional-Integral-Derivative (PID) controllers in which it operates massive number of variables. In order to effortlessness the operation of an unmanned vessel, we used an Arduino Uno Controller to monitoring and transferring the data to shore base station. The function of this controller is giving the particular location of the vessel and a real stream image of the situation surrounding the vessel. For that it's essential to have GPS, GSM & WEBCAM in which an Arduino Controller control and operate the system (input/output). The remote terminal is giving a signal to the controller to ON the motor and adjusts the particular degree to move at that exact time the signal will be given to GPS System and further to GSM and the location and real image of the vessel will be recorded. This paper ensures an accurately and real response to dangerous situations like piracy or oil leakage/spill as a surveillance method.

Magnesium ions incorporated calcium phosphate was synthesized by wet chemical route and followed ... more Magnesium ions incorporated calcium phosphate was synthesized by wet chemical route and followed by microwave assisted method. XRD analysis was confirmed that the presence of calcium phosphate (hydroxyapatite). TEM analysis was exhibited rod-like morphology. XRF results were showed the percentage of calcium, phosphate, magnesium and oxygen. There was a slight blue shift observed in magnesium ions based samples. Higher magnesium (0.1 Mg-HAp) was revealed the greater discharging time with capacitance voltage (0.55 V). Magnesium based calcium phosphate was showed prolonged rate of drug release. At higher frequency, the Nyquist plot was showed the electrochemical behavior, however at lower frequency, revealed mass transfer process. Magnesium ions tailor the specific capacitance of calcium phosphate. Therefore, magnesium ions based phosphate samples could be an outstanding multifunctional candidate for drug release and supercapacitor applications.

Applications of multi-level inverters have been generally accepted for high power high quality pu... more Applications of multi-level inverters have been generally accepted for high power high quality purposes. In this paper a multi-level inverter with reduced components has been designed. The power quality of the output waveforms is controlled by the multicarrier pulse width modulation (MCPWM). Different MCPWM methods are reviewed and the outputs are analyzed. The simulation model of 9-level asymmetrical inverter with reduced components is built to validate its operation and the results are presented. Simulation results of different modulation methods are compared. Out of these methods, the phase disposition pulse width modulation (PDPWM) of MCPWM provides better performance in terms of total harmonic distortion (THD).

Applications of multi level inverters have been broadly accepted for high power AC drives purpose... more Applications of multi level inverters have been broadly accepted for high power AC drives purposes. In this paper a multi level inverter with reduced number of components has been designed. The power quality of the output waveforms are controlled by proper selection of switching angles for different levels of the output. A simplified optimal THD modulation algorithm is used to calculate the proper switching angles of the output. This algorithm greatly reduces the computational efforts required than the conventional computation methods and also produces better output performances. The simulation model of 9-level asymmetrical inverter with reduced number of components is built to validate its operation and the results are presented.

In this paper a symmetrical reduced switch reverse voltage (RSRV) multi-level inverter which is c... more In this paper a symmetrical reduced switch reverse voltage (RSRV) multi-level inverter which is comparable to the conventional multilevel inverter is presented. With reduced number of switches, the performance of the conventional multi-level inverter is achieved. Switching angles of each switch are found by using the simple algorithm based on the property of sine wave. Finally a model of 13level multi-level inverter is build and presented. The simulation results of this topology inverter are included.

A New multilevel inverter with reduced number of switches and unequal DC sources is presented. Co... more A New multilevel inverter with reduced number of switches and unequal DC sources is presented. Compared to conventional inverter this inverter produces higher number of output levels with less number of switches and thus harmonics are reduced and the power quality is improved. The switching angles of each level in the output are determined using simple sine property to reduce the output harmonics. The simulation of 33-level asymmetrical multilevel inverter with reduced number of switches is performed using MATLAB/Simulink and the results are presented. The output voltage and current harmonic contents thus reduced are brought to the IEEE standards.

Applications of multilevel inverters have been widely accepted for high-power and high-voltage in... more Applications of multilevel inverters have been widely accepted for high-power and high-voltage industry purposes. Their performance is very much superior to that of traditional two-level inverters due to reduced harmonic distortion and lower electromagnetic interference. In this paper a multilevel inverter circuit with reduced number of switches and symmetric voltage sources has been designed for hybrid generation system. The switching angles for various levels of the output are obtained by using the simple sine property. Finally, the 11-level inverter model is built using Matlab/ Simulink to validate this topology. The simulation results are presented.

Renewable energy is derived from natural resources and most commonly used renewable energy system... more Renewable energy is derived from natural resources and most commonly used renewable energy system is photovoltaic cells. DC-DC boost converter serves many purposes and usually required in many applications which has a low output voltage such as batteries, photo-voltaic cell. In this paper interleaved boost converter (IBC) topology is discussed for solar energy generation. IBC have better performance characteristics compared to a conventional boost converter due to increased efficiency. DC-DC IBC have been considered and analyzed by input current ripple and output current ripple and output voltage ripple. The waveforms of voltage and current ripples and the output voltage are obtained by using MATLAB/SIMULINK are presented. The design of inductor, capacitor and analysis of ripples has been presented.

In recent years, shipping industries are directed towards energy-efficient ships with less pollut... more In recent years, shipping industries are directed towards energy-efficient ships with less pollution. The conventional ship uses diesel generators to drive the propulsion motors. Implementation of hybrid microgrids to the shipboard power systems (SPSs) reduces the cost of propulsion and increases the efficiency of ship system. In this regard, research works focus on integrating renewable energy sources such as solar PV and wind with conventional diesel generators, batteries, fuel cells, etc. The various energy sources in shipboard power systems have to be managed technically as well as eco-friendly. Hence an energy management system is mandatory in the ships to control and observe the overall performance of the SPSs. This paper proposes the integration of wind energy systems with high-frequency power electronic converter in SPSs.

Circuits and Systems, 2016