Kartick Chandra Jana

Hardware design and implementation of Unity Power Factor Rectifiers using microcontrollers

In this work, a hardware design of phase controlled rectifier has been implemented in an economical manner in power electronics laboratory using microcontroller. Various observations are recorded in this field in centuries but introducing microcontroller in this arena would be a new phase in this field of research, thus making the process more precise with faster response. Microcontroller is used to generate gate pulses to SCR. Zero Crossing Detector is employed for synchronizing the input with firing pulses in order to have controlled DC output. Detailed description and functioning of individual blocks is explained with the relevant waveforms. All waveforms obtained from 200MHz DSO at different stages are included along with the output waveforms obtained on PSIM Software. Phase controlled rectifiers are better than uncontrolled rectifier in the aspect of harmonics generated as well as controlled DC output.

Comparative study of asymmetrical configuration of multilevel inverter for different levels

Industrial appliances requires wide range of voltage as well as power levels. Multilevel inverter became popular in the arena of medium voltage and higher power rating application as the better solution. It generates higher staircase output voltage levels employing lower value of voltage sources with required number of power electronics switches. Switching losses reduces in-return provides better power factor by increasing the levels of output voltage. This work is focused on achieving minimum harmonic distortion with the minimum number of power supplies at low switching frequency using nearest level modulation control strategy for three phase asymmetrical cascaded H-bridge configuration. A comparative study has been done in MATLAB/SIMULINK environment at different levels.

A Novel Single-Phase Multilevel Inverter Topology with Reduced Component Count

Multilevel inverter has developed as a superior elective for different applications (medium and also high power) meeting the standards. When compared with the basic 2-level voltage source inverters, the multilevel inverter has been found superior due to reduced electromagnetic compatibility and lesser harmonic distortion. In this paper, a novel multilevel inverter, which uses fewer numbers of total components as compared with the existing inverters (especially for higher levels), has been suggested. Hence, the total cost is reduced and complexity is also reduced for higher voltage levels. The comparison has been done regarding number of DC sources, switches, and diodes. The topology is simulated for 19-level employing SPWM as the control strategy, being simulated in MATLAB/SIMULINK environment and validated this simulation by using real-time digital simulator (OP-5600).

Multilevel Inverter with Optimal Reduction of Power Semi-conductor Switches

Multilevel Converters is the most emerging topic of research now-a-days due to its enormous various industrial applications like cement factory, ceramic industry, aerospace applications, marine applications and many more. Besides this multilevel inverter enables the usage of renewable energy sources i.e. wind, photovoltaic, fuel cells that can be easily interlinked to a multilevel converter system for the higher power rating applications. In this paper, a novel 9-level and 17-level single phase multilevel inverter has been designed, analyzed, described, and verified in MATLAB/Simulink environment. The prototype model is developed in laboratory and the simulated results of 9-level inverter is confirmed by the corresponding experimental results. In this paper, the comparison chart between the proposed topology and some recent proposed topologies (both the symmetrical and asymmetrical topologies) has been included as well in relations of the total number of power semi-conductor devices, driver circuits, DC supply sources/capacitors and the total components required.

Comprehensive study of various configurations of three-phase Multilevel inverter for different levels

In the arena of power conversion technology, Multilevel inverter topology has emerged as a significant substitute. With increase in voltage levels at the output, total harmonics distortion reduces resulting good power quality and reduced switching losses. In this paper, a broad study of multilevel inverters (three phase) i.e. cascaded H-bridge multilevel inverter, Neural point clamped multilevel inverter, Flying capacitor multilevel inverter. It mainly focused on THD spectrum of each mentioned configuration with increase in number of voltage levels at the output, being simulated in MATLAB/SIMULINK environment.

Operation and control of three-phase multilevel inverter with reduced component

A generalized three-phase multilevel inverter with reduced number of switches have been presented. The number of output voltage levels can be increased to a significant value by incorporating additional switches and the DC voltage sources. The detailed analysis of the recommended multilevel inverter has been accomplished for a seven-level inverter. Modelling and simulations of the proposed generalized three-phase inverter are carried out using MATLAB/SIMULINK. The simulation results of the proposed multilevel configuration corresponding to the different voltage levels as well as at different modulation index are presented under speed control of induction motor using constant voltage-frequency method.