Digital Commons Network^™

Congestion And Price Prediction In Locational Marginal Pricing Markets Considering Load Variation And Uncertainty, Rui Bo

Doctoral Dissertations

This work investigates the prediction of electricity price and power transmission network congestions under load variation and uncertainty in deregulated power systems. The study is carried out in three stages.

In the first stage, the mathematical programming models, which produce the generation dispatch solution, the Locational Marginal Price (LMP), and the system statuses such as transmission congestions, are reviewed. These models are often referred to as Optimal Power Flow (OPF) models, and can be categorized into two major groups: Alternating Current OPF (ACOPF) and Direct Current OPF (DCOPF). Due to the convergence issue with the ACOPF model and the concern …

Automated Correction And Optimized Contrast Enhancement Of Multi-Line Ccd Images, Zhiyu Chen

Doctoral Dissertations

This dissertation addresses automated correction and optimized contrast enhancement of multi-line CCD images for inspection and surveillance applications, focusing on three topics: multi-line CCD imaging systems setup, automated correction of multi-line CCD images, and automatic optimized image contrast enhancement.

generation, low cost, etc. However, due to the physical separation of line CCD sensors for the red (R), green (G), blue (B) color channel, the color images acquired by multi-line CCD cameras intrinsically exhibit a color misalignment defect, which is expressed as that the edges of objects in the scene are separated by a certain number of pixels in the R, …

Development And Analysis Of Interior Permanent Magnet Synchronous Motor With Field Excitation Structure, Seong Taek Lee

Doctoral Dissertations

Throughout the years Hybrid Electric Vehicles (HEV) require an electric motor which has high power density, high efficiency, and wide constant power operating region as well as low manufacturing cost. For these purposes, a new Interior Permanent Magnet Synchronous Motor (IPMSM) with brushless field excitation (BFE) is designed and analyzed. This unique BFE structure is devised to control the amount of the air-gap flux for the purpose of achieving higher torque by increasing the air-gap flux at low speed and wider operating speed range by weakening the flux at high speed.

On the process of developing the new IPMSM, the …

Design And Application Of Hybrid Multilevel Inverter For Voltage Boost, Haiwen Liu

Doctoral Dissertations

Today many efforts are made to research and use new energy sources because the potential for an energy crisis is increasing. Multilevel converters have gained much attention in the area of energy distribution and control due to its advantages in high power applications with low harmonics. They not only achieve high power ratings, but also enable the use of renewable energy sources. The general function of the multilevel converter is to synthesize a desired high voltage from several levels of dc voltages that can be batteries, fuel cells, etc.

This dissertation presents a new hybrid multilevel inverter for voltage boost. …

Automated Surveillance Systems With Multi-Camera And Robotic Platforms, Chung Hao Chen

Doctoral Dissertations

This dissertation addresses automated surveillance systems focusing on four topics: (1) spatial mappings of omnidirectional and PTZ cameras, and PTZ and PTZ cameras; (2) target hopping application for dual camera systems; (3) camera handoff and placement; (4) the mobile tracking platform. The four topics represent four contributions in this dissertation.

Dual camera systems have been widely used in surveillance because of the ability to explore the wide field of view (FOV) of the omnidirectional camera and the wide zoom range of the PTZ camera. Most existing algorithms require a priori knowledge of the projection models of omnidirectional and PTZ cameras …

A Current-Mode Multi-Channel Integrating Analog-To-Digital Converter, Neena Balakrishnan Nambiar

Doctoral Dissertations

Multi-channel analog to digital converters (ADCs) are required where signals from multiple sensors can be digitized. A lower power per channel for such systems is important in order that when the number of channels is increased the power does not increase drastically. Many applications require signals from current output sensors, such as photosensors and photodiodes to be digitized. Applications for these sensors include spectroscopy and imaging. The ability to digitize current signals without converting currents to voltages saves power, area, and the design time required to implement I-to-V converters.

This work describes a novel and unique current-mode multi-channel integrating ADC …

“Field Weakening Operation Of Ac Machines For Traction Drive Applications.”, Niranjan Anandrao Patil

Doctoral Dissertations

The rising cost of gasoline and environmental concerns have heightened the interest in electric/hybrid-electric vehicles. In passenger vehicles an electric traction motor drive must achieve a constant power speed range (CPSR) of about 4 to 1. This modest requirement can generally be met by using most of the common types of electric motors. Heavy electric vehicles, such as tanks, buses and off-road equipment can require a CPSR of 10 to 1 and sometimes much more. Meeting the CPSR requirement for heavy electric vehicles is a significant challenge. This research addresses the CPSR capability and control requirements of two candidates for …

A Novel Frequency Based Current-To-Digital Converter With Programmable Dynamic Range, Xiaoyan Yu

Doctoral Dissertations

This work describes a novel frequency based Current to Digital converter, which would be fully realizable on a single chip.

Biological systems make use of delay line techniques to compute many things critical to the life of an animal. Seeking to build up such a system, we are adapting the auditory localization circuit found in barn owls to detect and compute the magnitude of an input current.

The increasing drive to produce ultra low-power circuits necessitates the use of very small currents. Frequently these currents need to accurately measured, but current solutions typically involve off-chip measurements. These are usually slow, …

Reconfigurable Rf Front End Components For Multi-Radio Platform Applications, Chunna Zhang

Doctoral Dissertations

The multi-service requirements of the 3G and 4G communication systems, and their backward compatibility requirements, create challenges for the antenna and RF front-end designs with multi-band and wide-band techniques. These challenges include: multiple filters, which are lossy, bulky, and expensive, are needed in the system; device board size limitation and the associated isolation problems caused by the limited space and crowd circuits; and the insertion loss issues created by the single-pole-multi-through antenna switch.

As will be shown, reconfigurable antennas can perform portions of the filter functions, which can help solve the multiple filters problem. Additionally, reconfigurable RF circuits can decrease …