Jaedo Park, PhD

Ongoing research projects

Renewable Energy Harvester for Microbial Fuel Cells 

Microbial fuel cell (MFC) is an emerging technology for sustainable energy production. However, the electric energy currently generated from MFCs is not directly usable due to the low voltage and current output. This research seeks to develop a steady and efficient energy harvesting technology for MFCs using power electronics switching converters. Dr. Park's projects have been sponsored by the National Science Foundation (NSF) and the U.S. Navy. A research outcome on MFC powered Christmas Tree has been featured in ABC news "Christmas Lights Powered By Poop Research At UC Denver Proves Viability Of Waste As Energy Source". [Link]

Power Management Systems for Thermoelectric Generators

Thermoelectric generators (TEGs) have been actively investigated to use where long lifetime and high reliability are required. A TEG is a semi-conductor device that converts thermal energy to electrical energy without any mechanical moving part. It is small, light, reliable, and eco-friendly. This research focuses on harvesting efficiency improvement and energy management system development for wider usage of TEG as an energy source.

DC-Bus Microgrid System

Distributed generation systems have recently been intensively researched and developed, especially in conjunction with renewable energy sources such as wind turbines and photovoltaic systems. As a way to realize the distributed generation system, a "microgrid" system that combines distributed energy sources and loads as a small-scale power system can be used. The microgrid approach reduces or eliminates central dispatch and enhances the power quality to sensitive loads. The research topics include control, integration, and optimization of individual microgrid components.

High-Speed Synchronous Generator Control for Microturbine

Microturbine generator is one of the emerging technologies in power and energy field. A microturbine usually has permanent magnet synchronous generator connected to the gas turbine operating in very high-speed ranging from 50,000 to 100,000 rpm. This research investigates high-performance controller for microturbine synchronous generator.

 

Patents

U.S. Patents

• Apparatus and method for the generation of transmission signals (Co-inventer, Provisional patent pending, 2017)
• Fault detection and isolation in low voltage DC bus microgrid system (Sole inventer, US 9,007,735, 2015)

Korean Patents

• Current Control method for Three Phase AC Motor (1004469620000, 2004)
• Current Control method for Three Phase AC Motor (1004594710000, 2004)
• Operation Control Equipment of Multi-Inverter Type Elevator (1001863730000, 1998)

Book Chapters

*Student advised by Jae-Do Park

Jae-Do Park, Bhanu Babaiahgari*, Md Habib Ullah*

Coordinated Protection of DC Microgrids in DC Distribution Systems and Microgrids
The institution of Engineering and Technology (IET), In press, 2018

Papers

​​​​Publications including journal and conference/workshop papers. 

*Student advised by Jae-Do Park

Md Habib Ullah*, Jae-Do Park
Distributed Energy Trading in Smart Grid Over Directed Communication Network
IEEE Transactions on Smart Grid, Accepted, 2021.

Md Habib Ullah*, Jae-Do Park
A Two-Tier Distributed Market-Clearing Scheme for Peer-to-Peer Energy Sharing in Smart Grid
IEEE Transactions on Industrial Informatics, In press, 2021.

Bhanu Babaiahgari*, Yeonho Jeong and Jae-Do Park
Dynamic Control of Region of Attraction using Variable Inductor for Stabilizing DC Microgrids with Constant Power Loads
IEEE Transactions on Industrial Electronics, In press, doi: 10.1109/TIE.2020.3026270.

Md Habib Ullah*, Bhanu Babaiahgari*, Anas Alseyat* and Jae-Do Park
A Computationally Efficient Consensus-Based Multi-Agent Distributed EMS for DC Microgrids
IEEE Transactions on Industrial Electronics, Vol. 68, no. 6, pp 5425-5435, June 2021.

Md Habib Ullah*, Jae-Do Park
P2P2G Coordinated Energy Sharing in Grid-Interactive Transactive Systems
IEEE Power and Energy Society General meeting (PESGM) 2021, Aug. 2-7, 2021.

Yeonho Jeong, Min-Su Lee, Jae-Do Park, Jae-Kuk. Kim and Ronald Rorrer
Hold-up Time Compensation Circuit of Half-Bridge LLC Resonant Converter for High Light-load Efficiency
IEEE Transactions on Power Electronics, Vol. 35, No. 12, pp.13126-13135, Dec. 2020.

Md Habib Ullah*, Anas Alseyat*, Jae-Do Park
Distributed Dynamic Pricing in Peer-to-Peer Transactive Energy Systems in Smart Grid
IEEE Power and Energy Society General meeting (PESGM) 2020, Aug. 2-7, 2020.

Yeonho Jeong, Jae-Do Park, Ronald Rorrer, Keon-Woo Kim, and Byoung-Hee Lee
A Novel Multi-input and Single-output DC/DC Converter for Small Unmanned Aerial Vehicle 2020
IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 1302-1308, Mar. 15, 2020.

Seungwhan. Ko, Yeonho Jeong, Ronald Rorrer and Jae-Do Park
High Efficiency Asymmetric Dual Active Clamp Forward Converter with Phase-Shift Control for Small Conduction Loss 2020
IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 1866-1871, Mar. 15, 2020.

Bhanu Babaiahgari*, Yeonho Jeong, Jae-Do Park
Stability Enhancement Method for DC Microgrids with Constant Power Loads using Variable Inductor 2020
IEEE Applied Power Electronics Conference and Exposition (APEC), pp. 2236-2240, Mar. 15, 2020.

Yeonho Jeong, Jae-Do Park, Gun-Woo Moon
An Interleaved Active-Clamp Forward Converter Modified for Reduced Primary Conduction Loss without Additional Components
EEE Transactions on Power Electronics, Volume 35, No. 1, pp.121-130, April 2019

Bhanu Babaiahgari*, Md Habib Ullah*, and Jae-Do Park
Coordinated Control and Dynamic Optimization in DC Microgrid Systems
International Journal of Electric Power and Energy, Volume 113, Pages 832-841, December 2019

Jae-Do Park, Songjun Lee
Single-Transistor Sub-1-V Self-Startup Voltage Boost Energy Harvesting System for Microbial Fuel Cells
Journal of Power Sources, Vol.418, pp.90-97, 2019.

Muhannad Alaraj*, Jae-Do Park
Net Power Positive Maximum Power Point Tracking Energy Harvesting System for Microbial Fuel Cell
Journal of Power Sources, Vol.418, pp.225-232, 2019.

Md Habib Ullah*, Anas Alseyat*, Jae-Do Park
Multi Agent System-based Distributed Energy Management in Smart Grid Under Uncertainty
IEEE Energy Conversion Congress and Exposition (ECCE) 2019, Sept. 28-Oct. 3, 2019.

Bhanu Babaiahgari*, Yeonho Jeong, and Jae-Do Park
Stability Analysis for Power Management Between Standalone DC Microgrids with Constant Power Loads
IEEE Energy Conversion Congress and Exposition (ECCE) 2019, Sept. 28-Oct. 3, 2019.

Md Habib Ullah*, Jae-Do Park
Peer-to-Peer Energy Arbitrage in Prosumer-based Smart Residential Distribution System
IEEE Energy Conversion Congress and Exposition (ECCE) 2019, Sept. 28-Oct. 3, 2019.

Yeonho Jeong, Jae-Do Park, Ronald Rorrer, Jae-Sang Kim
A Novel Control Scheme for High Efficiency Fuel Cell Power Systems in Parallel Structure
IEEE Energy Conversion Congress and Exposition (ECCE) 2019, Sept. 28-Oct. 3, 2019.

Md Habib Ullah*, Jae-Do Park
Multi Agent-based Distributed Energy Arbitrage in Residential Distribution System
IEEE Power and Energy Systems Society General Meeting 2019, August 4-8, 2019

Anas Alseyat* and Jae-Do Park
Multi-Agent System using JADE for Distributed DC Microgrid System Control
2019 North American Power Symposium (NAPS). IEEE, 2019.

Bhanu Babaiahgari*, Jae-Do Park
WIP: Development of Advanced Electric Drive Systems Laboratory
American Society of Engineering Education (ASEE) Annual Conference 2019, June 16-19, 2019.

Md Habib Ullah*, Jae-Do Park
Distributed Energy Optimization in MAS based Microgrids using Asynchronous ADMM
2019 IEEE PES Innovative Smart Grid Technologies Conference, Feb. 217-20, 2019.

Jae-Do Park, ​Md Habib Ullah*, Timberley M. Roane, Shuo Feng*
Optimal Operating Point for Energy Harvesting from Microbial Fuel Cell with Finite Initial Energy
Journal of Power Sources, Vol. 400, pp. 183-189, October 2018​
[Link]

Bhanu Babaiahgari*, Zizhuo Chen*, Jae-Do Park
Design and Implementation of Electric Drives Laboratory using Commercial Microcontroller Development Kits​ 
2018 American Society of Engineering Education (ASEE) Annual Conference & Exposition, Jun. 24-27, 2018
[Link]

Md Habib Ullah*, Jae-Do Park
Intelligent Real Time Electricity Price Forecasting for Energy Management in Grid-Tied MTDC Microgrids 
IEEE Energy Conversion Congress and Exposition (ECCE) 2018, Sept. 23-27, 2018

Jessica Romero*, Timberley Roane, Jae-Do Park
Enhancing the Electrogenic Conditions in a Wastewater Microbial Fuel Cell
American Society of Microbiology (ASM) Annual Conference 2018, Jun. 6, 2018

Sungho Hwang, Yong-Soon Im, Hanchoon Song, Jae-Do Park
Real Time Emulation of IEC 61850 SV, GOOSE and MMS using NS-3
Journal of Engineering and Applied Science, Vol.13, No.3, pp.634-638, 2018​

Bhanu Babaiahgari*, Md Habib Ullah*, Jae-Do Park
Coordinated Control and Optimization of DC Power Systems
IEEE Energy Conversion Congress and Exposition (ECCE) 2017, pp.2618-2624, Oct. 2017
[Link]

Jessica Romero, Timberley Roane, Jae-Do Park
Microbial Fuel Cell Design to Increase Power Production by Microbial Electrogens in Wastewater
Society for Industrial Microbiology and Biotechnology (SIMB) Annual Meeting 2017, #34326, July 30-Aug. 3, 2017
[Link​]

Muhannad Alaraj*, Feng Shuo*, Timberley M. Roane, Jae-Do Park
Effect of power shape on energy extraction from microbial fuel cell
Journal of Power Sources, Vol. 366, pp. 86-92, 2017
[Link​]​​

Jae-Do Park, Timberley M. Roane, Zhiyong Jason Ren, Muhannad Alaraj*
Dynamic modeling of a microbial fuel cell considering anodic electron flow and electrical charge storage 
​Applied Energy, Vol. 193, Pages 507-514, 2017
[Link​]​

Muhannad Alaraj*, Miloje S. Radenkovic, Jae-Do Park
Intelligent energy harvesting scheme for microbial fuel cells: Maximum power point tracking and voltage overshoot avoidance 
Journal of Power Sources, Vol. 342, pp.726-732, 2017
[Link​]

Miloje S. Radenkovic, Jae-Do Park
Almost sure convergence of extremum seeking algorithm using stochastic perturbation
Systems & Control Letters, Vol. 94, pp 133-141, Aug. 2016 
[Link​]

Jaejin Yeo, Khurram Javed, Jaeseong Lee, Jeongjin Roh, Jae-Do Park
A capacitorless low-dropout regulator with enhanced slew rate and 4.5-uA quiescent current
Analog Integrated Circuits and Signal Processing, pp. 1-9, doi:10.1007/s10470-016-0869-z, 2016
[Link​]

X. Wang, L. Zhou, L. Lu, F.L. Lobo, N. Li, H. Wang, Jae-Do Park, and Z. Jason Ren
Alternating Current Influences Anaerobic Electroactive Biofilm Activity
Environmental Science & Technology, In Press, 2016
[Link​]

Keoni Hutton*, Bhanu Babaiahgari*, Jae-Do Park
A Comparative Study on Electrical Distribution Systems for the U.S. Coast Guard’s 270-ft Medium Endurance Cutter​
North America Power Symposium 2016, Sep. 2016 

Mustafa Sen*, Muhannad Alaraj*, Jae-Do Park
Open Circuit Fault Detection and Localization in Modular Multilevel Converter
North America Power Symposium 2016, Sep. 2016 ​

​Miloje Radenkovic, Jae-Do Park
Almost Sure Convergence of Extremum Seeking Algorithm using Stochastic Perturbation 
Systems & Control Letters, Volume 94, August 2016, Pages 133-141, 
[Link]

Jae-Do Park
Ground Fault Detection and Location for Ungrounded DC Traction Power Systems
IEEE Transactions on Vehicular Technology, Vol.64, No.12, pp.5667-5676, Dec. 2015
[ Link ]​

Matthew Bond*, Jae-Do Park
Current Sensorless Power Estimation and MPPT Implementation for Thermoelectric Generators
IEEE Transactions on Industrial Electronics, Vol.62, No.9, pp.5539-5548, Sept. 2015
[ Link ]

Heming Wang, Jae-Do Park, Zhiyong Ren
Practical Energy Harvesting for Microbial Fuel Cells: A Review
Environmental Science & Technology Letters, Vol. 49, No. 6, pp.3267-3277, 2015
[ Link ]

Bu-Il Kang*, Jae-Do Park
Application of Thyristor-Controlled Series Reactor for Fault Current Limitation and Power System Stability Enhancement 
International Journal of Electric Power and Energy Systems, Vol. 63, pp. 236-245, 2014 
[ Link ]

Jae-Do Park, Hohyun Lee, Matthew Bond*
Uninterrupted Thermoelectric Energy Harvesting using Temperature-Sensor-Based Maximum Power Point Tracking Circuit 
Energy Conversion and Management, vol. 86C, pp. 233-240, 2014 
[ Link ]

Muhannad Alaraj*, Jason Ren, Jae-Do Park
Microbial Fuel Cell Energy Harvester using Flyback Converter 
Journal of Power Sources, pp. 636-642, February 2014 
[ Link ]

Jae-Do Park, Jared Candelaria*, Liyuan Ma*, Kyle Dunn*
DC Ring-Bus Microgrid Fault Protection and Identification of Fault Location 
IEEE Transactions on Power Delivery, vol.28, no.4, pp.2574-2584, Oct. 2013  [ Link ]

Jae-Do Park, Jared Candelaria* 
Fault Detection and Isolation in Low-Voltage DC-Bus Microgrid System
IEEE Transactions on Power Delivery, Vol. 28, No. 2, pp. 779-787, April 2013.  [ Link ]

Heming Wang*, Zhiyong Ren, Jae-Do Park
Power Electronics Converters for Microbial Fuel Cell Energy Extraction: Effect of Inductance, Duty Ratio, and Switching Frequency 
Journal of Power Sources, Vol. 220, pp. 89-94, 2012  [ Link ]

Jae-Do Park, Zhiyong Ren 
Hysteresis-Controller-Based Energy Harvesting Scheme for Microbial Fuel Cells With Parallel Operation Capability 
IEEE Transactions on Energy Conversion, Vol. 27, No. 3, pp. 715-724, September 2012.  [ Link ]

Heming Wang*, Jae-Do Park, Zhiyong Ren 
Active Energy Harvesting from Microbial Fuel Cells at the Maximum Power Point without Using Resistors 
Environmental Science and Technology, Vol. 46, No. 9, pp. 5247-5252, May 2012.  [  Link ]

Jae-Do Park, Zhiyong Ren  High Efficiency Energy Harvesting from Microbial Fuel Cells using a Synchronous Boost Converter 
Journal of Power Sources, Vol. 208, pp. 322-327, 2012.  [ Link ]

Jae-Do Park, Zhiyong Ren 
Hysteresis Controller Based Maximum Power Point Tracking Energy Harvesting System for Microbial Fuel Cells
Journal of Power Sources, Vol. 205, pp. 151-156, 2012  [ Link ]

Jae-Do Park
Design and Implementation of a Fundamental Electric Machine Laboratory using Industrial Devices 
Conference Proceedings of American Society of Engineering Education (ASEE) Annual Conference 2012  [ Link ]

Bu-Il Kang*, Jae-Do Park
Wind Power Technologies from the Perspective of System Operator 
IEEE Symposium on Power Electronics and Machines in Wind Applications (PEMWA) 2012  [ Link ]

Jae-Do Park, Zhiyong Ren 
Efficient Energy Harvester for Microbial Fuel Cell using DC/DC Converters 
Conference proceedings of IEEE ECCE 2011, September 2011  [ Link ]

Jared Candelaria*, Jae-Do Park 
VSC-HVDC System Protection: A Review of Current Methods 
Conference proceedings of IEEE PSCE 2011, March 2011  [ Link ]

Jae-Do Park 
Simple Flywheel Energy Storage using Squirrel-Cage Induction Machine for DC Bus Microgrid Systems 
Conference proceedings of IEEE IECON 2010, Nov. 2010  [ Link ]

Jae-Do Park, Claude Kalev, Heath Hofmann 
Modeling and Control of Solid-Rotor Synchronous Reluctance Machine Considering Rotor Flux Dynamics 
IEEE Transactions on Magnetics, Vol.44, No.12, pp.4639-4647, Dec. 2008  [  Link ]

Jae-Do Park, Claude Kalev, Heath Hofmann 
Control of High-Speed Solid-Rotor Synchronous Reluctance Motor/Generator for Flywheel-Based Uninterruptible Power Supplies 
IEEE Transactions on Industrial Electronics, Vol.55, No.8, pp.3038-3046, August 2008  [ Link ]

Jae-Do Park, Claude Kalev, Heath Hofmann 
Analysis and Reduction of Time Harmonic Rotor Loss in Solid-Rotor Synchronous Reluctance Drive 
IEEE Transactions on Power Electronics, Vol.23, No.2, pp. 985-992, March 2008  [ Link ]

Jae-Do Park, Claude Khalizadeh, Heath Hofmann 
Design and control of high-speed solid-rotor synchronous reluctance drive with three-phase LC filter 
Conference Record of the IEEE Industry Applications Conference 2005, 40th IAS Annual Meeting. Vol.1, pp. 715-722, 2-6 Oct. 2005  [ Link ]

Jae-Do Park, Heath Hofmann, Claude Khalizadeh 
Feedforward Control of High-Speed Solid-Rotor Synchronous Reluctance Machines With Rotor Dynamics Model 
Conference Record of the IEEE Industry Applications Conference 2004, 39th IAS Annual Meeting. Vol.1, pp. 298~306, 3-7 Oct. 2004  [ Link ]

Jae-Do Park, Gyu-Shik Che, Hai-Won Yang 
A Study on the Water Level Control of Nuclear Power Plant Steam Generator using Adjustable Level Setting at Low Power 
Transactions of KIEE, Vol.41, No.11, 1992, pp. 1305~1315

Jae-Do Park, Gyu-Shik Che, Hai-Won Yang 
Design of a Feed Water Control System (FWCS) using Neural Networks for a Nuclear Power Plant Steam Generator 
Conference Record of the KIEE Fall Annual Conference 1992, KIEE Fall Annual Conference, pp. 400~402, 1992

Courses

• ELEC 3164 - Energy Conversion
• ELEC 4164/5164 - Electric Drive Systems
• ELEC 4170 - Electric Drive Systems Laboratory
• ELEC 5710 - Advanced Electric Drive Systems
• ELEC 5720- Practical Drive Systems
• ELEC 5725- Advanced Electric Machinery

Course descriptions

ELEC 4164/5164 - Electric Drive Systems 

Covers power electronics drives for rotating electric machinery. Topics include mechanical system requirements for drives, typical load characteristics, electric circuits review, magnetic circuits review, power converter fundamentals, electromechanical energy conversion principles, introduction to DC, synchronous and induction machine drives. Prereq: ELEC 3164 Energy Conversion or equivalent. Cross-listed with ELEC 5174. Semester Hours: 3 to 3

ELEC 4170 - Electric Drive Systems Laboratory

Offers hands-on experience on rotating electric machine drives. Experiments include diode rectifier, pulse-width modulation (PWM) inverter, induction, DC, and synchronous machine drives. Up-to-date industrial equipment and advanced computer controller will be utilized. Prereq or Coreq: ELEC 4164 Electric Drive Systems or equivalent. Semester Hours: 1 to 1

ELEC 5710 - Advanced Electric Drive Systems 

Covers advanced theory and control techniques for electric machine drives. The course offers theories and techniques for graduate researches and engineering jobs in related fields. Topics include field oriented control theory, pulse-width modulation (PWM) techniques, detailed dynamic modeling and simulation of induction machine/drive system, advanced control algorithms and controller design. Matlab programming is used for simulations. Prereq: ELEC 4164 Electric Drive Systems or equivalent. Semester Hours: 3 to 3

ELEC 5720 - Practical Drive Systems

Practical electric machine drive design and implementation techniques using industrial hardware and software are covered. Topics include electric machine and control theory review, power electronics converter control, induction machine speed controller design and actual implementation of an induction machine drive using up-to-date microcontroller. Prereq: ELEC 1520 Embedded Systems Engineering I or equivalent, ELEC 4164/5164 Electric Drive Systems or equivalent. Semester Hours: 3 to 3

ELEC 5725 - Advanced Electric Machinery

In-depth theoretical principles, physical insight and analysis techniques for electromechanics and electric machines are covered focused on rotating machinery. The course is advanced sequel of ELEC 3164 Energy Conversion for graduate level students. Topics include magnetic circuits, electromechanical energy conversion principles, various electric machine definitions such as DC, induction, and synchronous machines, their properties and analysis, software tools, and examples. Prereq: ELEC 3164 Energy Conversion or equivalent. Semester Hours: 3 to 3

Education

PhD Electrical Engineering, 2007
Pennsylvania State University, University Park, PA 

MS Electrical Engineering, 1994
Hanyang University, Seoul, Korea 

BS Electrical Engineering, 1992
Hanyang University, Seoul, Korea 

Industry Experience

Rotonix USA, Newbury Park, CA
Engineering Consultant, 2012 present

• Electric machine drive system development

Advanced Turbine Designes, El Segundo, CA
Engineering Consultant, 2009

• Control system development for prototype microturbine controller

Pentadyne Power Corporation, Chatsworth, CA
Controls Software Engineer/Manager, 2004 2009

• Digital magnetic bearing controller development
• Control system development for synchronous reluctance motor
• Firmware development for DSP board using TI TMS320F28335, F2812 and C6711

LG Industrial Systems Co. Ltd., R&D Center, Anyang, Korea
Research Engineer/Manager, 1994-2001

• Low-cost inverter system development
• High-performance vector control inverter development
• Performance improvement of general purpose inverter system
• Inverter development for high-speed elevator system
• Firmware development using Motorola DSP56F803, TI TMS320C31, C32, F240, Intel 80186
• GUI development for inverter system using NI LabWindows/CVI 
• Collaborated on development of graphical code generation tool for inverter systems 

Energy Conversion Research Force (ECRF)

 

Current Students

• Bhanu Babaiahgari, Ph.D., Electrical Eng., "DC Power System Control and Protection"
• Anas Alseyat, Ph.D., Electrical Eng., "DC Power System Control and Protection"
• Md. Habib Ullah, Ph.D., Electrical Eng., "DC Power System Optimization"
• Feng Shuo, Ph.D., Electrical Eng., "Bioelectricity Energy Harvesting"
• Hwanmin Jeong, M.S., Electrical Eng., "Multi-Agent System for DC Power Systems"
• Zizhuo Chen, M.S., Electrical Eng., "BLDC Drive System"

 

Graduates

• Muhannad Alaraj, Ph.D., Electrical Eng., "Microbial Fuel Cell Energy Harvesting Systems"
• Feng Shuo, M.S., Electrical Eng., "Bioelectricity Energy Harvesting"
• Keoni Hutton, M.S., Electrical Eng., "Shipboard Power Systems"
• Mustafa Sen, M.S., Electrical Eng., "Fault Detection and Location for MMC System"
• Bhanu Babaiahgari, M.S., Electrical Eng., "Motor Control System Implementation using Matlab Code Generator"
• Matthew Bond, M.S., Electrical Eng., "Current Sensorless Energy Harvesting System for Thermoelectric Generator"
• Thiago Alves Lima, B.S., Electrical Eng., "Autonomous Bootstrap Circuit"​
• Liyuan Ma, M.E., Electrical Eng., "Fault Protection System for Data Center"
• Bu-Il Kang, M.S., Electrical Eng., "Application of Thyristor-Controlled Series Reactor for Fault Current Limitation and Power System Stability Enhancement", Won Outstanding Graduate Student Award 2013.
• Abdulaziz Alateeq, M.S., Electrical Eng., "Active Disturbance Rejection Control"
• Heming Wang, Ph.D., Civil Eng., University of Colorado Denver (Co-advising with Prof. J. Ren)
• Abdela Esmeail, M.S., Electrical Eng., "Induction Mahcine Torque Control"
• Jiannin Song, M.S., Electrical Eng., "Wind Turbine Related Grid Fault Analysis"
• Casey Clark, M.E., Electrical Eng., "Induction Machine Driven Pump Station Design and Implemtation"
• Ayman Saed, M.S., Electrical Eng., "PV-driven Water Pumping System with MPPT Technique"
• Sejal Metha, M.S., Electrical Eng., "Control of Grid-Tied PWM Converter"
• Subesh Aryal, M.S., Electrical Eng., "Grid-connected PV Control System"
• Jared Candelaria, M.S., Electrical Eng., "Protection of VSC-based Low-Voltage DC Systems", May 2012, Won Outstanding Graduate Student Award 2012.
• Manasa Ramaraju, M.S., Electrical Eng., "Interpretation of Operational Faults in an Inverter fed Induction machine"
• Abdulsalam Benaissa, M.S., Electrical Eng., "Comparative Study of Induction Motor and Permanent Magnet Synchronous Motor"
  

Jae-Do Park, Zhiyong Ren 
Energy Harvesting System for Microbial Fuel Cells with Maximum Power Point and Parallel Operation Capability 
IEEE Transactions on Energy Conversion, In press, doi:10.1109/TEC.2012.2196044 
[ Full Text ]

Microbial fuel cell (MFC) is an emerging technology for sustainable energy production. An MFC employs indigenous microorganisms as biocatalysts and can theoretically convert any biodegradable substrate into electricity, making the technology a viable solution for sustainable waste treatment or autonomous power supply. However, the electric energy currently generated from MFCs is not directly usable due to the low voltage and current output. Moreover, the output power can fluctuate significantly according to the operating conditions, which makes stable harvest of energy difficult. This paper presents an MFC energy harvesting scheme using a hysteresis controller and two layers of DC/DC converters. The proposed energy harvesting system can capture the energy from multiple MFCs at individually controlled operating point and at the same time form the energy into a usable shape. 


Heming Wang*, Jae-Do Park, Zhiyong Ren 
Active Energy Harvesting from Microbial Fuel Cells at the Maximum Power Point without Using Resistors 
Environmental Science and Technology, In press, doi:10.1021/es300313d 
[ Full Text ]

Microbial fuel cell (MFC) is a new approach to accomplish simultaneous waste treatment and alternative energy production. An MFC employs exoelectrogenic bacteria to directly convert biodegradable substrates to electricity. The electricity production from MFCs can be maximized at a certain operating condition, which is defined as the maximum power point (MPP). However, it is difficult to maintain an MFC at its MPP during operation, because the power output from MFCs fluctuates constantly due to the changes of microbial activities or environmental conditions. This study developed a maximum power point tracking (MPPT) technique using digitally controlled potentiometers for hysteresis controller based energy harvesting system. Results with lab scale MFC reactors have shown that the system can track the MPP and maintain the maximum energy harvesting in real-time, suggesting that the proposed system can capture the most available energy from MFCs at the most efficient operating point. 


Jae-Do Park, Zhiyong Ren 
High Efficiency Energy Harvesting from Microbial Fuel Cells using a Synchronous Boost Converter 
Journal of Power Sources, In press, doi: 10.1016/j.jpowsour. 2012.02.035 
[ Full Text ]

Microbial fuel cells (MFCs) convert chemical energy stored in biodegradable substrates into direct electricity, which can be used to power remote sensors or offset the energy used during wastewater treatment. Power electronics converters have been developed to replace external resistors and harvest and store energy from MFCs, which is a significant improvement in MFC studies because external resistors only demonstrate power generation potential without actually capturing usable energy. However, the efficiency of conventional diode based energy harvester is low due to the high power loss of the diode. This study presents a synchronous boost converter based MFC energy harvester using a P-channel MOSFET, which improved the system efficiency by 73%, from 43.8% to 75.9%. A modified hysteresis controller was developed to provide precise control during energy harvesting and operating and also prevented reverse current flows. 


Jae-Do Park, Zhiyong Ren 
Hysteresis Controller Based Maximum Power Point Tracking Energy Harvesting System for Microbial Fuel Cells
Journal of Power Sources, In press, In press, doi: 10.1016/j.jpowersour.2012.01.053 
[ Full Text ]

Microbial fuel cell (MFC) is a new approach to accomplish simultaneous waste treatment and alternative energy production. An MFC employs exoelectrogenic bacteria to directly convert biodegradable substrates to electricity. The electricity production from MFCs can be maximized at a certain operating condition, which is defined as the maximum power point (MPP). However, it is difficult to maintain an MFC at its MPP during operation, because the power output from MFCs fluctuates constantly due to the changes of microbial activities or environmental conditions. This study developed a maximum power point tracking (MPPT) technique using digitally controlled potentiometers for hysteresis controller based energy harvesting system. Results with lab scale MFC reactors have shown that the system can track the MPP and maintain the maximum energy harvesting in real-time, suggesting that the proposed system can capture the most available energy from MFCs at the most efficient operating point. 


Jae-Do Park
Design and Implementation of a Fundamental Electric Machine Laboratory using Industrial Devices 
Forthcoming on Conference Proceedings of American Society of Engineering Education (ASEE) Annual Conference 2012 
[ Full Text ]

The design and implementation of the instructional electric machine laboratory is described in this paper. The objectives of this project are to upgrade 50-year old laboratory equipment and to provide students with hands-on experience on up-to-date electric machines, drives and instruments, as well as to improve their understanding of the theory learned from lectures. Instead of the systems especially designed for educational purpose, off-the-shelf industrial devices have been selected for the experiments to make them more realistic and thus closer to work situations, as well as more cost effective. Experiments, hardware components, instruments and student feedback about the laboratory course offered are presented.


Bu-Il Kang*, Jae-Do Park
Wind Power Technologies from the Perspective of System Operator 
Forthcoming on IEEE Symposium on Power Electronics and Machines in Wind Applications (PEMWA) 2012 
[ Full Text ]

Various wind turbines have been developed and operated in distribution systems and transmission systems. The usage of wind power is now rapidly growing worldwide and some leading countries in wind power technologies have been developing new strategies and enhanced requirements for power system security and electrical power quality. But most of power systems have not prepared for them yet. Given the fact that the renewable energy sources, such as wind power, photovoltaic, fuel cells will be getting more importance for the future energy systems with the benefit of emission trading, most of developing countries and power systems that are not preparing for such movement should make their future plan not only for the power system security, but also for their economic development. In this paper, wind power technologies, which is one of the most promising alternative energy sources, is summarized from the viewpoint of power system operation and control.


Jae-Do Park, Zhiyong Ren
Efficient Energy Harvester for Microbial Fuel Cell using DC/DC Converters 
Conference proceedings of IEEE ECCE 2011, September 2011 
[ Full Text ]

Microbial fuel cell (MFC) is an emerging technology for sustainable energy production. An MFC employs indigenous microorganisms such as biocatalysts and can theoretically convert any biodegradable substrate into electricity, making the technology a viable solution for sustainable waste treatment or autonomous power supply. However, the electric energy currently generated from MFCs is not directly usable due to the low voltage and current output. Moreover, the output power can fluctuate significantly according to the operating points, which makes stable harvest of energy difficult. This paper presents a steady and efficient energy harvester from MFCs using two layers of DC/DC converters. The proposed energy harvester can capture the energy from MFCs at the most efficient operating point and at the same time form the energy into a usable shape.


Jared Candelaria, Jae-Do Park
VSC-HVDC System Protection: A Review of Current Methods 
Conference proceedings of IEEE PSCE 2011, March 2011 
[ Full Text ]

Currently classical thyristor-based high voltage direct current (HVDC) systems hold the market in bulk power transmission. However, recent advances in semiconductor technology have led to voltage source converter based HVDC (VSC-HVDC) systems becoming a viable competitor. Not only is VSC-HVDC a competitor for transmission but it can also be used in multi-terminal systems, which have become an attractive option for renewable energy applications or for distribution in large cities. As more and more VSC-HVDC systems are installed, the protection of these systems must be taken into account. This paper explores different options and ideas for VSC system protection. 


Jared Candelaria, Jae-Do Park
VSC-HVDC System Protection: A Review of Current Methods 
Conference proceedings of IEEE PSCE 2011, March 2011 
[ Full Text ]

Currently classical thyristor-based high voltage direct current (HVDC) systems hold the market in bulk power transmission. However, recent advances in semiconductor technology have led to voltage source converter based HVDC (VSC-HVDC) systems becoming a viable competitor. Not only is VSC-HVDC a competitor for transmission but it can also be used in multi-terminal systems, which have become an attractive option for renewable energy applications or for distribution in large cities. As more and more VSC-HVDC systems are installed, the protection of these systems must be taken into account. This paper explores different options and ideas for VSC system protection. 


Jae-Do Park
Simple Flywheel Energy Storage using Squirrel-Cage Induction Machine for DC Bus Microgrid Systems 
Conference proceedings of IEEE IECON 2010, Nov. 2010 
[ Full Text ]

A simple flywheel energy storage using a squirrel-cage induction machine is proposed in this paper. The suggested motor/generator system operates with an open-loop Volt/Hertz control scheme and utilizes only the nameplate data as machine parameters. Therefore complex controller tuning or machine parameter measurement is not required. Also, any communication between storage units or with other controllers is not necessary because the system uses bus voltage information for charge/discharge operations. The proposed system has an advantage on parallel operation because adding/replacing of units are straightforward. Hence it can easily operate with different types of storage or distributed energy sources in DC bus microgrid systems. Moreover, the proposed control scheme improves the overall stability of the DC bus system. The proposed system has been validated with Matlab simulation and an experimental setup is under construction for verification. 


Jae-Do Park, Claude Kalev, Heath Hofmann 
Modeling and Control of Solid-Rotor Synchronous Reluctance Machine Considering Rotor Flux Dynamics 
IEEE Transactions on Magnetics, Vol.44, No.12, pp.4639-4647, Dec. 2008 
[ Full Text ]

A model suitable for use in a vector control algorithm for synchronous reluctance machines with solid conducting rotors is presented in this paper. The developed model takes the rotor flux dynamics into consideration and is similar to an induction machine model, yet includes a magnetic saliency of the rotor. Techniques for parameter extraction are discussed. A modification of the model to incorporate the nonlinear magnetic phenomena is also suggested. The influence of nonlinear magnetics on the model-based controller is investigated. The proposed model yields an improved performance for a fast-changing torque command compared to the conventional model when utilized in a current regulator. Experimental results on a 120 kW, 55,000 rpm machine of a flywheel energy storage system validate the performance of the proposed model.


Jae-Do Park, Claude Kalev, Heath Hofmann 
Control of High-Speed Solid-Rotor Synchronous Reluctance Motor/Generator for Flywheel-Based Uninterruptible Power Supplies 
IEEE Transactions on Industrial Electronics, Vol.55, No.8, pp.3038-3046, August 2008 
[ Full Text ]

A hybrid controller, consisting of a model-based feedforward controller and a PI feedback compensator, for a solid-rotor synchronous reluctance motor/generator in a high-speed, flywheel-based uninterruptible power supply (UPS) application is proposed in this paper. The feedforward controller takes most of the control output of the current regulator based on the machine model, and the PI controllers compensate the possible inaccuracies of the model to improve the performance and robustness of the complete control system. The machine current tracking error caused by parameter inaccuracy in the model-based controller is mathematically analyzed, and utilized to dynamically compensate the estimated flux linkage to eliminate the steady-state error in current regulation. Stability analysis is also presented, and it can be seen that the regulation performance and robustness of the system are improved by the proposed hybrid controller. Simulation and experimental results consisting of a flywheel energy storage system validates the performance of the controller.


Jae-Do Park, Claude Kalev, Heath Hofmann 
Analysis and Reduction of Time Harmonic Rotor Loss in Solid-Rotor Synchronous Reluctance Drive 
IEEE Transactions on Power Electronics, Vol.23, No.2, pp. 985-992, March 2008 
[ Full Text ]

Synchronous reluctance machines with solid rotor construction have advantages in certain high-speed applications such as flywheel energy storage systems. However, the solid rotor allows the flow of eddy currents, resulting in rotor loss and heat generation. The switching harmonics in the stator voltage supplied by a PWM inverter are one of the sources of the rotor loss. This paper performs an analysis for the time harmonic loss in a solid-rotor synchronous reluctance machine, and investigates design and control issues associated with the inclusion of a three-phase LC filter for reduction of the rotor loss in solid rotor. A two-phase dynamic model of the machine which incorporates the LC filter dynamics is presented. This model is used to predict rotor losses due to switching harmonics generated by the three-phase PWM inverter. A model-based current regulator is utilized, which is modified to include the effects of the LC filter. Experimental results validate the proposed approach.


Jae-Do Park, Gyu-Shik Che, Hai-Won Yang 
A Study on the Water Level Control of Nuclear Power Plant Steam Generator using Adjustable Level Setting at Low Power 
Transactions of KIEE, Vol.41, No.11, 1992, pp. 1305~1315 
[ Full Text ]

The steam generator water level control at low power is very important in the nuclear power plant because the water level is unstable due to shrink and swelling phenomena and sometimes it would cause plant shutdown. For availability and reliability improvement for the water level control of nuclear power plant steam generator which critically impacts the plant availability, steam generator water level control system at low power for the already brought into domestic pressurized water reactors (PWRs) manufactured by Westinghouse is studied, and then, the water level variation depending on the power change at low power is studied variable water level control system in this paper.


Jae-Do Park, Claude Khalizadeh, Heath Hofmann 
Design and control of high-speed solid-rotor synchronous reluctance drive with three-phase LC filter 
Conference Record of the IEEE Industry Applications Conference 2005, 40th IAS Annual Meeting. Vol.1, pp. 715-722, 2-6 Oct. 2005 
[ Full Text ]

Synchronous reluctance machines with solid rotor construction have advantages in certain high-speed applications such as flywheel energy storage systems. However, the solid rotor allows the flow of eddy currents, resulting in heat generation. A three-phase LC filter can reduce rotor losses due to the switching harmonics generated by a 3-phase inverter. This paper investigates the design and control of a high-speed synchronous reluctance drive with a three-phase LC filter. A two-phase dynamic model of the drive which incorporates the LC filter dynamics is presented. This model is used to predict rotor losses due to switching harmonics using phasor analysis. A feedforward-based current regulator is utilized, which is modified to include the effects of the LC filter. Simulation and experimental results validate the proposed approach.


Jae-Do Park, Heath Hofmann, Claude Khalizadeh 
Feedforward Control of High-Speed Solid-Rotor Synchronous Reluctance Machines With Rotor Dynamics Model 
Conference Record of the IEEE Industry Applications Conference 2004, 39th IAS Annual Meeting. Vol.1, pp. 298~306, 3-7 Oct. 2004 
[ Full Text ]

An open-loop current regulator for a high-speed synchronous reluctance machine with a solid conducting rotor is presented. A rotor dynamic model is developed which is similar to an induction machine model yet includes a magnetic saliency of the rotor. The model is then used to calculate command voltages for a desired current in an open-loop current regulator. Techniques for parameter extraction and discrete-time models for digital implementation are discussed. Experimental results, including a 120kW discharge of a flywheel energy storage system, validate the performance of the controller.


Jae-Do Park, Gyu-Shik Che, Hai-Won Yang 
Design of a Feed Water Control System (FWCS) using Neural Networks for a Nuclear Power Plant Steam Generator 
Conference Record of the KIEE Fall Annual Conference 1992, KIEE Fall Annual Conference, pp. 400~402, 1992 
[ Full Text ]