Differential Processing for Improvements in Solar Array Energy Harvest MSEE student Jason Galtieri with adviser P. Krein Mismatch among photovoltaic (PV) cells accounts for a significant proportion of annual energy reduction in solar arrays. Sources of mismatch include cell degradation, poor factory binning, and non-uniform irradiance due to shading. Differential power processing (DPP) has the […]
Differential Power Processing for Voltage Regulation of Series-Stacked Processor Cores
Differential Power Processing for Voltage Regulation of Series-Stacked Processor Cores MSEE student Dipanjan Das with adviser P. Krein Power delivery to multi-core processors has become increasingly challenging as transistor sizes decrease and operating voltages thereby decrease. With the growing number of cores in each processor, power requirements tend to remain the same, but handling output […]
Electromagnetic and Mechanical Performance Analysis of Additive Manufactured Electric Machines Using Finite Element Simulations
Electromagnetic and Mechanical Performance Analysis of Additive Manufactured Electric Machines Using Finite Element Simulations CEME Collaborator Julia Zhang Oregon State University Additive manufacturing is opening up new ground for innovations in low-volume production due to faster and cheaper prototyping, reduced lead times, and shorter supply chains. This research focuses on numerical simulations to analyze […]
Toolset to Study Power Flow between Aircraft Systems
Toolset to Study Power Flow between Aircraft Systems MSEE student Christopher Mak with adviser P. Krein A toolset designed to study the power flow between various aircraft systems was created to improve the “system of systems” aircraft design, where complex aircraft systems are separated to minimize how systems interface with each other. Composed of various […]
An Investigation of Electronic Pole Changing in High Inverter Count Induction Machines
An Investigation of Electronic Pole Changing in High Inverter Count Induction Machines PhD student Matthew Magill with adviser P. Krein Improved system performance and additional operating capabilities are available when an induction machine is excited using a large number of electrical inputs (greater than three). Electronic pole changing, or the electronic adjustment of an induction […]
Optimizing Variable DC Link Voltage for an Induction Motor Drive under Dynamic Conditions
Optimizing Variable DC Link Voltage for an Induction Motor Drive under Dynamic Conditions PhD student Srikanthan Sridharan with adviser P. Krein Induction motor drives are conventionally operated with a fixed inverter dc-link bus voltage. However, low-drive speeds will result in a low modulation index and poor dc bus utilization of the inverter. Aperiodic current […]
Fully Integrated AC-AC ModularMachine Drive Based on GaN Devices
Fully Integrated AC-AC ModularMachine Drive Based on GaN Devices CEME Collaborator Yehui Han – University of Wisconsin-Madison The research objective was to study and design a fully integrated ac-ac modular machine drive based on the latest GaN devices. A new small-sized version of the Vienna rectifier with outstanding performance and high power density was […]
Power Electronic Feasibility and Characterization for Extremely High Temperature Environments
Power Electronic Feasibility and Characterization for Extremely High Temperature Environments M.S. student Ross Liederbach with advisers Philip T. Krein, Kyekyoon Kim, Elyse Rosenbaum Supported by National Science Foundation Graduate Research Fellowship and Strategic Research Initiative Wide bandgap device materials offer promising characteristics for power conversion at high temperatures. Several applications already benefit from high temperature (~200° […]
Design of high power density, capacitor-based multilevel inverters
Design of high power density, capacitor-based multilevel inverters Christopher Barth Ph.D. student with advisor R. Pilawa Recent advances in semiconductor and microcontroller technology are opening new opportunities in power electronics design. Traditionally, inverters have employed a minimal number of active switching components and used large passive inductors to filter two or three voltage levels into […]
High Speed / High Power Density Air-Core Electrical Machine Design – Thermal Management
High Speed / High Power Density Air-Core Electrical Machine Design – Thermal Management MSEE student Xuan Yi with Adviser K. Haran The goal of this high-speed electrical machine project is to build a permanent magnet machine with a power density of 13 KW/kg (8hp/lb) and over 96% efficiency under rated condition. The targeted power density […]