Umer Ali Khan is seeking a position utilizing his electrical engineering skills. He has a BSC in Electrical Engineering (Power) from Wah Engineering College University of Wah. His experience includes an internship at Pakistan Ordnance Factory Wah Cantt working with steam turbines, gas turbines, electrical workshops, and PLC control systems. His final year project involved designing a Wi-Fi based home automation system to remotely control appliances. He has technical skills in AutoCAD, MatLab, power simulations, and programming.
Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower ...Asoka Technologies
This paper proposes a new method of generating higher number of levels in the voltage waveform by stacking multilevel converters with lower voltage space vector structures. An important feature of this stacked structure is the use of low voltage devices while attaining higher number of levels. This will find extensive applications in electric vehicles since direct battery drive is possible. The voltages of all the capacitors in the structure can be controlled within a switching cycle using the switching state redundancies (pole voltage redundancies). This helps in reducing the capacitor size. Also, the capacitor voltages can be balanced irrespective of modulation index and load power factor. To verify the concept experimentally, a 9-level inverter is developed by stacking two 5-level inverters and an induction motor is run using V/f control scheme. Both steady state and transient results are presented.
Voltage unbalance and harmonics compensation for islanded microgrid invertersAsoka Technologies
Voltage source inverters (VSIs) are usually used for all kinds of distributed generation interfaces in a microgrid. It is the microgrid’s superiority to power the local loads continuously when the utility fails. When in islanded mode, the voltage and frequency of the microgrid are determined by the VSIs; therefore the power quality can be deteriorated under unbalanced and non-linear loads. A voltage unbalance and harmonics compensation strategy for the VSIs in islanded microgrid is proposed in this study. This method is implemented in a single synchronous reference frame (SRF) and is responsible for both the voltage unbalance and harmonic compensation. Furthermore, the virtual impedance loop is modified to improve the compensation
effect. The impedance model of the VSI is built to explain the compensation ability of the proposed strategy. The whole control system mainly includes power droop controllers, a modified virtual impedance loop and inner SRF-based voltage unbalance and harmonics compensators. The proposed strategy is demonstrated in detail and validated with simulations and experiments.
Presently Multilevel inverters are extensively used for high-voltage applications and their execution is exceptionally better to that of regular two-level inverters due to minimized harmonic distortion, lower electromagnetic interference and larger DC link voltages. Nevertheless certain shortcomings are faced such as adding in number of components and voltage balancing problem. In order to overcome these, a seven-level hybrid inverter has been proposed. This topology requires a lesser number of power switches which results in the decrease of multifaceted nature, add up to cost and weight of the inverter. Finally this can be able to generate near sinusoidal voltages and approximately fundamental frequency switching. The simulation and the experimental results of a modified cascaded seven level H bridge inverter with and without LC filter are presented for validation.
Of late, electric vehicles (EVs) have attracted much attention owing to their use of clean energy. Large progress in lithium-ion battery has propelled the development of EVs.However, the challenge is that growing number of EVs leads to huge demand in electric power, which will aggravate the power grid load. This leads to an exploration for alternative and clean sources of energy to charge EVs. This project implements solar energy system to erect a charging station for EV application. The charging station employs multi-port charging by providing a constant voltage DC bus. The charging controllers are operated based on the concept of power balance, and constant current/constant voltage charging. Performance of the charging system is validated with simulation and experimental results.
Generation of Higher Number of Voltage Levels by Stacking Inverters of Lower ...Asoka Technologies
This paper proposes a new method of generating higher number of levels in the voltage waveform by stacking multilevel converters with lower voltage space vector structures. An important feature of this stacked structure is the use of low voltage devices while attaining higher number of levels. This will find extensive applications in electric vehicles since direct battery drive is possible. The voltages of all the capacitors in the structure can be controlled within a switching cycle using the switching state redundancies (pole voltage redundancies). This helps in reducing the capacitor size. Also, the capacitor voltages can be balanced irrespective of modulation index and load power factor. To verify the concept experimentally, a 9-level inverter is developed by stacking two 5-level inverters and an induction motor is run using V/f control scheme. Both steady state and transient results are presented.
Voltage unbalance and harmonics compensation for islanded microgrid invertersAsoka Technologies
Voltage source inverters (VSIs) are usually used for all kinds of distributed generation interfaces in a microgrid. It is the microgrid’s superiority to power the local loads continuously when the utility fails. When in islanded mode, the voltage and frequency of the microgrid are determined by the VSIs; therefore the power quality can be deteriorated under unbalanced and non-linear loads. A voltage unbalance and harmonics compensation strategy for the VSIs in islanded microgrid is proposed in this study. This method is implemented in a single synchronous reference frame (SRF) and is responsible for both the voltage unbalance and harmonic compensation. Furthermore, the virtual impedance loop is modified to improve the compensation
effect. The impedance model of the VSI is built to explain the compensation ability of the proposed strategy. The whole control system mainly includes power droop controllers, a modified virtual impedance loop and inner SRF-based voltage unbalance and harmonics compensators. The proposed strategy is demonstrated in detail and validated with simulations and experiments.
Presently Multilevel inverters are extensively used for high-voltage applications and their execution is exceptionally better to that of regular two-level inverters due to minimized harmonic distortion, lower electromagnetic interference and larger DC link voltages. Nevertheless certain shortcomings are faced such as adding in number of components and voltage balancing problem. In order to overcome these, a seven-level hybrid inverter has been proposed. This topology requires a lesser number of power switches which results in the decrease of multifaceted nature, add up to cost and weight of the inverter. Finally this can be able to generate near sinusoidal voltages and approximately fundamental frequency switching. The simulation and the experimental results of a modified cascaded seven level H bridge inverter with and without LC filter are presented for validation.
Of late, electric vehicles (EVs) have attracted much attention owing to their use of clean energy. Large progress in lithium-ion battery has propelled the development of EVs.However, the challenge is that growing number of EVs leads to huge demand in electric power, which will aggravate the power grid load. This leads to an exploration for alternative and clean sources of energy to charge EVs. This project implements solar energy system to erect a charging station for EV application. The charging station employs multi-port charging by providing a constant voltage DC bus. The charging controllers are operated based on the concept of power balance, and constant current/constant voltage charging. Performance of the charging system is validated with simulation and experimental results.
A generalized multilevel inverter topology with reduction of total standing v...Asoka Technologies
This paper presents a new multilevel inverter topology with reduced active switches
and total standing voltage. The proposed topology can generate a high number of voltage levels in the symmetric configuration. This topology intuitively generates positive and negative cycles without an additional H-bridge unit, which considerably reduces the total standing voltage of the inverter. A cascaded structure is developed from the proposed topology to create higher voltage levels. To show the novelty of the proposed topology, a thorough comparison between the available and the proposed topologies in terms of the number of switches, standing voltages, and dc-sources is presented. Furthermore, he power loss analysis is carried out for various load values. The feasibility of the proposed nine-level inverter is verified with simulation and experimental results.
A generalized multilevel inverter topology with reduction of total standing v...Asoka Technologies
This paper presents a new multilevel inverter topology with reduced active switches
and total standing voltage. The proposed topology can generate a high number of voltage levels in the symmetric configuration. This topology intuitively generates positive and negative cycles without an additional H-bridge unit, which considerably reduces the total standing voltage of the inverter. A cascaded structure is developed from the proposed topology to create higher voltage levels. To show the novelty of the proposed topology, a thorough comparison between the available and the proposed topologies in terms of the number of switches, standing voltages, and dc-sources is presented. Furthermore, he power loss analysis is carried out for various load values. The feasibility of the proposed nine-level inverter is verified with simulation and experimental results.
関東LibreOffice勉強会とは/ What's Kanto LibreOffice Study PartyNaruhiko Ogasawara
第1回関東LibreOffice勉強会開催にあたり、その趣旨を説明した資料です。
--
This slide describes "Kanto LibreOffice Study Party," one of Japanese area (near by Tokyo) local event of LibreOffice; it's target, focus and goal.
An integrated boost resonant converter for photovoltaic applicationsAsoka Technologies
Effective photovoltaic power conditioning requires efficient power conversion and accurate maximum power point tracking to counteract the effects of panel mismatch, shading, and general variance in power output during a daily cycle. In this paper, the authors propose an integrated boost resonant converter with low component count, galvanic isolation, simple control, as well as
high efficiency across a wide input and load range. Provided is a discussion of the converter synthesis, key operational features, converter design procedure, and loss analysis, as well as experimental verification by way of a 250-W prototype with a California Energy Commission efficiency of 96.8%.
This is Janardhan pursued Master of Engineering in Power Electronics. Currently working as a part time project engineer in Maxine Tec Research and Development Institute with having industry experience in Bharat Heavy Plate and Vessels Ltd. Published and Presented an IEEE paper on control of DFIG connected to variable speed wind turbine.
(Actively Seeking for Job Opportunity in Core Domain)
I have hands-on working experience on the following equipments:
• SIEMENS S7-300,400,200 PLC.
• B&R PLC.
• ALLEN BRADLEY PLC.
• OMRAN PLC.
• MARTS (OPTIC FIBRE) PLC.
• ERGO BLOCK KRONES LINE
• Erection, Commissioning and Installation of ERGO Block KRONES Line at the speed of 36000 bottles per hour.
• Erection, Commissioning and Installation of Checkmates at Can Line.
• Repairing, Maintenance and Trouble shooting of all types of INVERTERS (Danfoss, ABB, Sew, Carpanalli, Siemens, LG, Mitsubishi etc).
• Repairing, Maintenance and Trouble shooting of SERVO DRIVES (Sew, Acopos, Cosmos).
• Repairing, Maintenance, Trouble shooting and calibration of level transmitter, level probes, level switches, pressure transmitter, pressure switches, I/P converter, positioners, flow meters, proportional valves, temp controller, sensors, encoders, solid state relays, PT 100, thermo couple.
• Repairing, Maintenance and Trouble shooting of SERVO DRIVES (Sew, Acopos, Cosmos).
• Practical work experience on different Communication Protocols like Profibus, Asi-net, Ethernet etc.
• I have experience of installation, erection and commissioning of beverage plants with foreign experts (German, Italian and Chinese -- recent are Krones S14 blow mold, labbler and complete combi line)
• Hold working experience on Sidle, Simonazi, Krones, Sympack,Vander Molen and Techlong Company plants.
1. 1 | P a g e
UMER ALI KHAN
ualikhan39@gmail.com
Contact # 0310-5452725
House # B-69 street #12 shahwali colony Wah Cantt.
NIC NO – 37406-7330830-3
OBJECTIVE To work In an environment where I can utilize my engineering development skill,
perform challenging assignment for the organization and excel my abilities.
EDUCATION BSC ELECTRICAL ENGNEERING (POWER) - WAH ENGNEERING COLLEGE UNIVERSITY OF WAH
(2012-2016)
INTERMEDIATE- F.G SCIENCE DEGREE COLLEGE WAH CANTT
(2010-2012)
MATRIC - P.O.F MODEL HIGH SCHOOL WAH CANTT
(2000-2010)
EXPERIENCE INTERNEE – PAKISTAN ORDINANCE FACTORY WAH CANTT
Steam Turbine.
Gas Turbine.
Electrical Workshop.
PLC control system.
Diesel Engine generators (Standby Generator) capacity to give all power to the Plant
TECHNICAL &
PROFESSIONAL
SKILLS
AutoCAD.
Mat Lab.
Power Word Simulators (Designing of Electrical Busses).
Electrical drawing.
MS Word & Excel.
HTML programming.
Arduino Configuration and Net Surfing.
2. FINAL YEAR
PROJECT
WI-FIBASED HOME AUTOMATIONSYSTEM
Main objective is to remotely control home appliances through WI-FI. System has a router and
Arduino and application designed on WEB server. Router generates the signal, connectivity with
laptop or Android phone, display the window on which appliances are shown and through signal
of WI-FI easily hold these appliances by turned them ON/OFF.
PROJECTS COUPLED 12V DC MOTOR WITH GENRATOR TO PRODUCE POWER.
MODELS OF TRANSMISSIONTOWERS.
COMPLETE MODEL OF 132KV TRANSMISSION LINE AND GIVE LINE OF 65KV TO
INDUSTRYAND 33 KV TO SUBSTATION.
TRANSMISSIONLINE FAULT ANALYSISBY MATLAB SIMULATION.
CONVERT THE SINGLEPHASE SUPPLYTO THREE PHASE SUPPLY.
THE AUDIO VOICELEDS INDICATOR ON HIGH/LOW SIGNALSON PC THROUGH
MICROCONTROLER.
VOICECONTROL SENSORS TO TURN THE L.E.D ON/OFF.
MODEL OF DC MOTOR.
HEAT RECOVERYVENTILATION SYSTEM(HRVS).
ACHIEVEMENT Attend Seminar for IEEE.
Attend Seminar for MATLAB Simulations.
Attend Seminar on Renewable Energy at PEC.
PERSONAL
SKILLS
Comprehensive problem solvingabilities.
Good verbal and written communication skills.
Team facilitator and hard worker.
Extrovert positive attitude and friendly in nature.
INTRESTS
REFERENCE
Talk shows
Music listening
Reading books
Will be furnished upon request.