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Articles 1741 - 1770 of 3518
Full-Text Articles in Engineering
Analysis Of Simultaneous Switching Noise Coupling In Multilayer Power/Ground Planes With Segmentation Method And Cavity Model, Gang Feng, Jun Fan
Analysis Of Simultaneous Switching Noise Coupling In Multilayer Power/Ground Planes With Segmentation Method And Cavity Model, Gang Feng, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
An accurate power bus model is essential for predicting noise coupling in high-speed printed circuit board (PCB) and package designs. with a complex multilayer structure, the power bus is often modeled using numerical simulation methods. However, full-wave approaches are computationally inefficient, or even infeasible for extremely complicated geometries. Fortunately, the segmentation method makes it possible to combine different types of models together, and both simulation accuracy and efficiency can be obtained through this divide-and-conquer strategy. after segmentation, one of the fundamental blocks is a parallel plane pair. for this block, analytical expressions for the impedance (Z) matrix are available for …
An Intrinsic Circuit Model For Multiple Vias In An Irregular Plate Pair Through Rigorous Electromagnetic Analysis, Yao Jiang Zhang, Jun Fan
An Intrinsic Circuit Model For Multiple Vias In An Irregular Plate Pair Through Rigorous Electromagnetic Analysis, Yao Jiang Zhang, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
An irregular plate pair with multiple vias is analyzed by the segmentation method that divides the plate pair into a plate domain and via domains. in the via domains, all the parallel-plate modes are considered, while in the plate domain, only the propagating modes are included to account for the coupling among vias and the reflection from plate edges. Boundary conditions at both vias and plate edges are enforced and all parasitic components of via circuit are expressed analytically in terms of parallel-plate modes. the work presented in this paper indicates that a previous physics-Based via circuit model from intuition …
Dynamic Placement And Signal Selection For Upfcs In Wide-Area Controlled Power Systems, Mahyar Zarghami, Mariesa Crow
Dynamic Placement And Signal Selection For Upfcs In Wide-Area Controlled Power Systems, Mahyar Zarghami, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
This paper deals with the problem of damping inter-area oscillations in wide-area bulk power systems using unified power flow controllers. Dynamic placement and signal selection are two important issues when FACTS devices are deployed in the system. in the paper both problems have been investigated using a Most Dominant Branches table calculated based on modal analysis which shows the influence of active powers of the branches on inter-area modes of the system. First, dynamic placement has been explained in which the best placement candidates are selected based on their influence on inter-area modes. Next the paper deals with dynamic estimation …
A Hotspot-Based Protocol For Attack Traceback In Mobile Ad Hoc Networks, Hungyuan Hsu, Sencun Zhu, Ali Hurson
A Hotspot-Based Protocol For Attack Traceback In Mobile Ad Hoc Networks, Hungyuan Hsu, Sencun Zhu, Ali Hurson
Electrical and Computer Engineering Faculty Research & Creative Works
based on the principle of divide and conquer, in this paper we propose an efficient traceback protocol for mobile ad hoc networks, the protocol is capable of detecting a hotspot where the attacker resides. It works by dividing the forwarding path of every packet into multiple interweaving fragments and each reachable fragment is individually reconstructed during a traceback process. through simulations in theoretical mobility models as well as real mobility traces, we show that each traceback of our scheme can attribute to a very small hotspot and the attacker can be accurately identified after a number of traceback operations. © …
Programmed For Success: Educating Tomorrow's Workforce, Mariesa Crow
Programmed For Success: Educating Tomorrow's Workforce, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
I recently stepped down as chair of the IEEE Power & Energy Society (PES) Power & Energy Education Committee (PEEC) to take my place among a very dedicated group of past chairs and exemplary educators. I have been an active member of the PEEC since the start of my academic career 20 years ago in 1990. The education committee is comprised of educators and practicing engineers who are committed to power engineering career development, university education, and lifelong learning. The committee strives to address issues of whole-life education. This issue of IEEE Power and Energy Magazine has six feature articles …
Reliability Modeling And Analysis Of Clockless Wave Pipeline Core For Embedded Combinational Logic Design, Tao Feng, Noh-Jin Park, Minsu Choi, Nohpill Park
Reliability Modeling And Analysis Of Clockless Wave Pipeline Core For Embedded Combinational Logic Design, Tao Feng, Noh-Jin Park, Minsu Choi, Nohpill Park
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a model for analyzing the reliability of a clockless wave pipeline as an intellectual property (IP) core for embedded design. This design requires different clocking requirements by each embedded IP core during integration. Therefore, either partial or global lack of synchronization of the embedded clocking is considered for the data flow. The clockless wave pipeline represents an alternative to a traditional pipeline scheme; it requires an innovative computing model that is readily suitable for high-throughput computing by heterogeneous IP logic cores embedded in system-on-chip (SoC). A clockless wave pipeline technique relies on local asynchronous operation for seamless …
The New Centurions, Lynn K. Stichnote, Mariesa Crow
The New Centurions, Lynn K. Stichnote, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
The current group of young people entering the workforce belong to the so-called "millennial generation." Each generation has certain characteristics that have defined its interaction with the world; the millennials have been called the "Net generation." They are the first generation that has never known life without the Internet. As a result of their protected, structured, and positively reinforced upbringing, the millennials are an exceptionally accomplished, positive, upbeat, and optimistic generation. The millennials are the quintessential multitaskers, and they are used to having the world at their fingertips through online search engines. If organizations use the best of the millennials' …
Asymmetrical Cascade Multilevel Converters With Noninteger Or Dynamically Changing Dc Voltage Ratios: Concepts And Modulation Techniques, Shuai Lu, Sébastien Mariéthoz, Keith Corzine
Asymmetrical Cascade Multilevel Converters With Noninteger Or Dynamically Changing Dc Voltage Ratios: Concepts And Modulation Techniques, Shuai Lu, Sébastien Mariéthoz, Keith Corzine
Electrical and Computer Engineering Faculty Research & Creative Works
Asymmetrical cascade multilevel inverters offer a high number of voltage levels with a given switch count. for a given topology, the number of levels depends on the configuration of the dc voltage (ratios). This paper deals with the design and control of such converters with Non integer dc voltage ratio, which leads to unevenly distributed space vectors. It describes how to select the dc voltage ratio configurations that yield space vectors as evenly distributed as possible. It describes how to produce an effective PWM modulation that allows generating undistorted current even in the presence of (some) unevenly distributed space vectors. …
Microwave And Millimeter Wave Imaging System, R. Zoughi, Mohamed Ahmed Aboukhousa, Mohammad Tayeb Ahmad Ghasr, Sergey Kharkovsky, David Pommerenke
Microwave And Millimeter Wave Imaging System, R. Zoughi, Mohamed Ahmed Aboukhousa, Mohammad Tayeb Ahmad Ghasr, Sergey Kharkovsky, David Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
A sensor array having a plurality of modulated slots for microwave and/or millimeter wave imaging. The locations of the slots in the array define a spatial domain away from an object for detecting an electric field from the object. Each of the slots outputs a signal representative of the measured field and the location of the slot. A processor decodes the signals and generates an image of the object.
Adaptive Critics For Dynamic Optimization, Raghavendra V. Kulkarni, Ganesh K. Venayagamoorthy
Adaptive Critics For Dynamic Optimization, Raghavendra V. Kulkarni, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
A novel action-dependent adaptive critic design (ACD) is developed for dynamic optimization. the proposed combination of a particle swarm optimization-Based actor and a neural network critic is demonstrated through dynamic sleep scheduling of wireless sensor motes for wildlife monitoring. the objective of the sleep scheduler is to dynamically adapt the sleep duration to node's battery capacity and movement pattern of animals in its environment in order to obtain snapshots of the animal on its trajectory uniformly. Simulation results show that the sleep time of the node determined by the actor critic yields superior quality of sensory data acquisition and enhanced …
Quantum Inspired Pso For The Optimization Of Simultaneous Recurrent Neural Networks As Mimo Learning Systems, Bipul Luitel, Ganesh K. Venayagamoorthy
Quantum Inspired Pso For The Optimization Of Simultaneous Recurrent Neural Networks As Mimo Learning Systems, Bipul Luitel, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Training a single simultaneous recurrent neural network (SRN) to learn all outputs of a multiple-input-multiple-output (MIMO) system is a difficult problem. a new training algorithm developed from combined concepts of swarm intelligence and quantum principles is presented. the training algorithm is called particle swarm optimization with quantum infusion (PSO-QI). to improve the effectiveness of learning, a two-step learning approach is introduced in the training. the objective of the learning in the first step is to find the optimal set of weights in the SRN considering all output errors. in the second step, the objective is to maximize the learning of …
Enhanced Wide Area Monitoring System, Bipul Luitel, Ganesh K. Venayagamoorthy, Cameron E. Johnson
Enhanced Wide Area Monitoring System, Bipul Luitel, Ganesh K. Venayagamoorthy, Cameron E. Johnson
Electrical and Computer Engineering Faculty Research & Creative Works
This paper focuses on the design of a wide area monitoring system (WAMS) in a multimachine power system with enhanced reliability, integrity and security. a two-area four-machine power system is considered for the studies. the voltage and speed deviation information coming from the generators is used by the WAM to feed useful information to the wide area control system (WACS), which will then send control signals back to the power system. the proposed WAM uses current and past information from the generators to predict their future values. by combining features such as missing sensor fault tolerance, intrusion detection system and …
Real-Time Transient Stability Assessment Of A Power System During Energy Generation Shortfall, Y. Yare, Ganesh K. Venayagamoorthy
Real-Time Transient Stability Assessment Of A Power System During Energy Generation Shortfall, Y. Yare, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Real-time transient stability assessment (TSA) in power system is to determine a power system's ability to continue to provide service (electric energy) in case of an unforeseen catastrophic contingency in real-time. during system operation, the online determination of the dynamic security level is fundamental in order to take appropriate countermeasures, with the aim of restoring the system, if necessary, to a more secure operation condition. to assess the level of system strength or weakness relative to the occurrence of an undesired event, a quantitative measure based on transient stability index is often considered. in this paper, a practical generator maintenance …
The Challenge Of Operating Wind Power Plants Within A Microgrid Framework, Badrul H. Chowdhury, Hong T. Ma, Nikhil Ardeshna
The Challenge Of Operating Wind Power Plants Within A Microgrid Framework, Badrul H. Chowdhury, Hong T. Ma, Nikhil Ardeshna
Electrical and Computer Engineering Faculty Research & Creative Works
The challenges facing the operation of intermittent power sources, such as wind power, in capacity-limited microgrids are discussed. Solutions are explored for stable operation of the microgrid in islanded mode in the presence of wind power generations. Energy storage can be used to provide ride through for momentary drop in wind power or for sudden increase in loads. a wind plant pitch angle controller (PAC) and a rotor speed controller (RSC) are introduced for wind power plant active power adjustment to help with frequency regulation. the use of Static Synchronous Compensator (STATCOM) is discussed for stabilizing the microgrid voltage during …
Over The Air Programming On Imote2-Based Sensor Networks, Rashmdfi Parthasarathy, Nina Peterson, Wen Zhan Song, Ali Hurson, Behrooz A. Shirazi
Over The Air Programming On Imote2-Based Sensor Networks, Rashmdfi Parthasarathy, Nina Peterson, Wen Zhan Song, Ali Hurson, Behrooz A. Shirazi
Electrical and Computer Engineering Faculty Research & Creative Works
Some of the main challenges that Wireless Sensor Networks (WSNs) face are reliability, flexibility and security. When WSNs deployed in remote locations need to be reprogrammed, environmental conditions often make it impossible to physically retrieve them. over the Air Programming (OAP) plays an important role in achieving this task. Several platform dependent protocols have been developed for OAP including Deluge [4] and MOAP [3]. Due to the restrictions of these platform-dependent protocols, any modification to the hardware requires modifications to the underlying protocol. for example, using OAP for Imote2 sensors requires porting Deluge from an existing hardware. This paper reports …
Standby Leakage Power Reduction Technique For Nanoscale Cmos Vlsi Systems, Heungjun Jeon, Yong-Bin Kim, Minsu Choi
Standby Leakage Power Reduction Technique For Nanoscale Cmos Vlsi Systems, Heungjun Jeon, Yong-Bin Kim, Minsu Choi
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a novel low-power design technique is proposed to minimize the standby leakage power in nanoscale CMOS very large scale integration (VLSI) systems by generating the adaptive optimal reverse body-bias voltage. The adaptive optimal body-bias voltage is generated from the proposed leakage monitoring circuit, which compares the subthreshold current (ISUB) and the band-to-band tunneling (BTBT) current (IBTBT). The proposed circuit was simulated in HSPICE using 32-nm bulk CMOS technology and evaluated using ISCAS85 benchmark circuits at different operating temperatures (ranging from 25°C to 100°C). Analysis of the results shows a maximum of 551 and …
Channel Equalization And Symbol Detection For Single-Carrier Mimo Systems In The Presence Of Multiple Carrier Frequency Offsets, Jian Zhang, Yahong Rosa Zheng, Chengshan Xiao, Khaled Ben Letaief
Channel Equalization And Symbol Detection For Single-Carrier Mimo Systems In The Presence Of Multiple Carrier Frequency Offsets, Jian Zhang, Yahong Rosa Zheng, Chengshan Xiao, Khaled Ben Letaief
Electrical and Computer Engineering Faculty Research & Creative Works
A new frequency-domain channel equalization and symbol detection scheme is proposed for multiple-input multiple-output (MIMO) single-carrier broadband wireless systems in the presence of severely frequency-selective channel fading and multiple unknown carrier-frequency offsets (CFOs). Multiple CFOs cause severe phase distortion in the equalized data for large block lengths and/or constellation sizes, thus yielding poor detection performance. Instead of explicitly estimating the CFOs and then compensating them, the proposed scheme estimates the rotated phases (not frequencies) caused by multiple unknown CFOs and then removes the phase rotations from the equalized data before symbol detection. the estimation accuracy of the phase rotation is …
Signal Integrity Design For High-Speed Digital Circuits: Progress And Directions, Jun Fan, Xiaoning Ye, Jingook Kim, Bruce Archambeault, Antonio Orlandi
Signal Integrity Design For High-Speed Digital Circuits: Progress And Directions, Jun Fan, Xiaoning Ye, Jingook Kim, Bruce Archambeault, Antonio Orlandi
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reviews recent progress and future directions of signal integrity design for high-speed digital circuits, focusing on four areas: signal propagation on transmission lines, discontinuity modeling and characterization, measurement techniques, and link-path design and analysis. © 2006 IEEE.
Systematic Microwave Network Analysis For Multilayer Printed Circuit Boards With Vias And Decoupling Capacitors, Yao Jiang Zhang, Zaw Zaw Oo, Xing Chang Wei, En Xiao Liu, Jun Fan, Er Ping Li
Systematic Microwave Network Analysis For Multilayer Printed Circuit Boards With Vias And Decoupling Capacitors, Yao Jiang Zhang, Zaw Zaw Oo, Xing Chang Wei, En Xiao Liu, Jun Fan, Er Ping Li
Electrical and Computer Engineering Faculty Research & Creative Works
An efficient microwave network method is proposed for signal and power integrity analysis of a multilayer printed circuit board with multiple vias and decoupling capacitors. the multilayer parallel plate structure is described as a cascaded microwave network. the admittance matrix of a single plate pair with ports defined in via holes both on top and bottom plates is obtained through the intrinsic via circuit model and impedance matrix between two plates. a recursive algorithm is provided to obtain the combined admittance matrix of two layers of plate pair coupled through via holes on a common plate. Decoupling capacitors are naturally …
Huygens’ Box Methodology For Signal Integrity Analysis, Lijun Jiang, J. D. Morsey, B. J. Rubin, W. C. Chew, M. K. Li, Y. Liu
Huygens’ Box Methodology For Signal Integrity Analysis, Lijun Jiang, J. D. Morsey, B. J. Rubin, W. C. Chew, M. K. Li, Y. Liu
Electrical and Computer Engineering Faculty Research & Creative Works
A method for performing a signal integrity analysis on an integrated circuit (IC) that includes a plurality of scatterers by dividing the scatterers into subgroups using a nested Huygens' equivalence principal algorithm and solving a set of equations realized thereby with a reduced coupling matrix. The method includes decomposing the IC design into a plurality of small non-overlapping circuit sub-domains, wherein each of the sub-domains is formed as a small, enclosed region. Each sub-domain is analyzed independently of the other sub-domains using only electric fields to represent the interactions of each sub-domains with the other sub-domains as equivalent currents on …
Neural Network Output Feedback Control Of Robot Formations, Travis Dierks, Sarangapani Jagannathan
Neural Network Output Feedback Control Of Robot Formations, Travis Dierks, Sarangapani Jagannathan
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a combined kinematic/torque output feedback control law is developed for leader follower-Based formation control using backstepping to accommodate the dynamics of the robots and the formation in contrast with kinematic-Based formation controllers. a neural network (NN) is introduced to approximate the dynamics of the follower and its leader using online weight tuning. Furthermore, a novel NN observer is designed to estimate the linear and angular velocities of both the follower robot and its leader. It is shown, by using the Lyapunov theory, that the errors for the entire formation are uniformly ultimately bounded while relaxing the separation …
An Affine Projection Sign Algorithm Robust Against Impulsive Interferences, Tiange Shao, Yahong Rosa Zheng, Jacob Benesty
An Affine Projection Sign Algorithm Robust Against Impulsive Interferences, Tiange Shao, Yahong Rosa Zheng, Jacob Benesty
Electrical and Computer Engineering Faculty Research & Creative Works
A new affine projection sign algorithm (APSA) is proposed, which is robust against non-Gaussian impulsive interferences and has fast convergence. the conventional affine projection algorithm (APA) converges fast at a high cost in terms of computational complexity, and it also suffers performance degradation in the presence of impulsive interferences. the family of sign algorithms (SAs) stands out due to its low complexity and robustness against impulsive noise. the proposed APSA combines the benefits of the APA and SA by updating its weight vector according to the L1-norm optimization criterion while using multiple projections. the features of the APA and the …
Automatic Detection Of Critical Dermoscopy Features For Malignant Melanoma Diagnosis, William V. Stoecker, Randy Hays Moss, R. Joe Stanley, Xiaohe Chen, Kapil Gupta, Bijaya Shrestha, Pavani Jella
Automatic Detection Of Critical Dermoscopy Features For Malignant Melanoma Diagnosis, William V. Stoecker, Randy Hays Moss, R. Joe Stanley, Xiaohe Chen, Kapil Gupta, Bijaya Shrestha, Pavani Jella
Electrical and Computer Engineering Faculty Research & Creative Works
Improved methods for computer-aided analysis of identifying features of skin lesions from digital images of the lesions are provided. Improved preprocessing of the image that 1) eliminates artifacts that occlude or distort skin lesion features and 2) identifies groups of pixels within the skin lesion that represent features and/or facilitate the quantification of features are provided including improved digital hair removal algorithms. Improved methods for analyzing lesion features are also provided.
A Model-Based Fault-Detection And Prediction Scheme For Nonlinear Multivariable Discrete-Time Systems With Asymptotic Stability Guarantees, Balaje T. Thumati, Sarangapani Jagannathan
A Model-Based Fault-Detection And Prediction Scheme For Nonlinear Multivariable Discrete-Time Systems With Asymptotic Stability Guarantees, Balaje T. Thumati, Sarangapani Jagannathan
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a novel, unified model-Based fault-detection and prediction (FDP) scheme is developed for nonlinear multiple-input multiple-output (MIMO) discrete-time systems. the proposed scheme addresses both state and output faults by considering separate time profiles. the faults, which could be incipient or abrupt, are modeled using input and output signals of the system. the fault-detection (FD) scheme comprises online approximator in discrete time (OLAD) with a robust adaptive term. an output residual is generated by comparing the FD estimator output with that of the measured system output. a fault is detected when this output residual exceeds a predefined threshold. Upon …
Novel And Simple High-Frequency Single-Port Vector Network Analyzer, Mohamed A. Abou-Khousa, Mark A. Baumgartner, Sergey Kharkovsky, R. Zoughi
Novel And Simple High-Frequency Single-Port Vector Network Analyzer, Mohamed A. Abou-Khousa, Mark A. Baumgartner, Sergey Kharkovsky, R. Zoughi
Electrical and Computer Engineering Faculty Research & Creative Works
Portable, accurate, and relatively inexpensive high-frequency vector network analyzers (VNAs) have great utility for a wide range of applications, encompassing microwave circuit characterization, reflectometry, imaging, material characterization, and nondestructive testing to name a few. To meet the rising demand for VNAs possessing the aforementioned attributes, we present a novel and simple VNA design based on a standing-wave probing device and an electronically controllable phase shifter. The phase shifter is inserted between a device under test (DUT) and a standing-wave probing device. The complex reflection coefficient of the DUT is then obtained from multiple standing-wave voltage measurements taken for several different …
Historical Document Enhancement Using Lut Classification, Tayo Obafemi-Ajayi, Gady Agam, Ophir Frieder
Historical Document Enhancement Using Lut Classification, Tayo Obafemi-Ajayi, Gady Agam, Ophir Frieder
Electrical and Computer Engineering Faculty Research & Creative Works
The fast evolution of scanning and computing technologies in recent years has led to the creation of large collections of scanned historical documents. It is almost always the case that these scanned documents suffer from some form of degradation. Large degradations make documents hard to read and substantially deteriorate the performance of automated document processing systems. Enhancement of degraded document images is normally performed assuming global degradation models. When the degradation is large, global degradation models do not perform well. In contrast, we propose to learn local degradation models and use them in enhancing degraded document images. Using a semi-automated …
Causal Rlgc( Ƒ ) Models For Transmission Lines From Measured S-Parameters, Jianmin Zhang, James L. Drewniak, David Pommerenke, Marina Koledintseva, Richard E. Dubroff, Wheling Cheng, Zhiping Yang, Qinghua B. Chen, Antonio Orlandi
Causal Rlgc( Ƒ ) Models For Transmission Lines From Measured S-Parameters, Jianmin Zhang, James L. Drewniak, David Pommerenke, Marina Koledintseva, Richard E. Dubroff, Wheling Cheng, Zhiping Yang, Qinghua B. Chen, Antonio Orlandi
Electrical and Computer Engineering Faculty Research & Creative Works
Frequency-dependent causal RLGC(f) models are proposed for single-ended and coupled transmission lines. Dielectric loss, dielectric dispersion, and skin-effect loss are taken into account. The dielectric substrate is described by the two-term Debye frequency dependence, and the transmission line conductors are of finite conductivity. In this paper, three frequency-dependent RLGC models are studied. One is the known frequency-dependent analytical RLGC model ( RLGC-I), the second is the RLGC(f) model (RLGC-II) proposed in this paper, and the third (RLGC-III) is same as the RLGC -II, but with causality enforced by the Hilbert transform in frequency domain. The causalities of the three RLGC …
Recurrent Neural Networks Based Impedance Measurement Technique For Power Electronic Systems, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine, Jing Huang
Recurrent Neural Networks Based Impedance Measurement Technique For Power Electronic Systems, Peng Xiao, Ganesh K. Venayagamoorthy, Keith Corzine, Jing Huang
Electrical and Computer Engineering Faculty Research & Creative Works
When designing and building power systems that contain power electronic switching sources and loads, system integrators must consider the frequency-dependent impedance characteristics at an interface to ensure system stability. Stability criteria have been developed in terms of source and load impedance, and it is often necessary to measure system impedance through experiments. Traditional injection-based impedance measurement techniques require multiple online testing that lead to many disadvantages, including prolonged test time, operating point variations, and impedance values at limited frequency points. The impedance identification method proposed in this paper greatly reduces online testing time by modeling the system with recurrent neural …
A Novel Approach To Interarea Oscillation Damping By Unified Power Flow Controllers Utilizing Ultracapacitors, Mahyar Zarghami, Mariesa Crow, Jagannathan Sarangapani, Yilu Liu, Stan Atcitty
A Novel Approach To Interarea Oscillation Damping By Unified Power Flow Controllers Utilizing Ultracapacitors, Mahyar Zarghami, Mariesa Crow, Jagannathan Sarangapani, Yilu Liu, Stan Atcitty
Electrical and Computer Engineering Faculty Research & Creative Works
This paper discusses a novel approach for damping interarea oscillations in a bulk power network using multiple unified power flow controllers (UPFCs) utilizing ultracapacitors, also known more generally as electrochemical capacitors (ECs). In this paper, a new control is introduced to mitigate interarea oscillations by directly controlling the UPFCs' sending and receiving bus voltages that better utilizes the stored energy in the ECs. The results of this controller are compared with and without ECs. The proposed control provides better interarea oscillation mitigation when applied to multiple UPFCs in the 118-bus IEEE test system.
Reducing Common-Mode Voltage In Three-Phase Sine-Triangle Pwm With Interleaved Carriers, Jonathan W. Kimball, Maciej Jan Zawodniok
Reducing Common-Mode Voltage In Three-Phase Sine-Triangle Pwm With Interleaved Carriers, Jonathan W. Kimball, Maciej Jan Zawodniok
Electrical and Computer Engineering Faculty Research & Creative Works
Interleaving PWM waveforms is a proven method to reduce ripple in dc-dc converters. The present work explores interleaving for three-phase motor drives. Fourier analysis shows that interleaving the carriers in conventional uniform PWM significantly reduces the common-mode voltage. New DSP hardware supports interleaving directly with changes to just two registers at setup time, so no additional computation time is needed during operation. The common-mode voltage reduction ranges from 36% at full modulation to 67% when idling with zero modulation. Third harmonic injection slightly reduces the advantage (to 26% at full modulation). However, the maximum RMS common-mode voltage is still less …