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Missouri University of Science and Technology
Electrical and Computer Engineering Faculty Research & Creative Works
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- Particle Swarm Optimisation (10)
- Vehicles (10)
- Electric Vehicles (8)
- Propulsion (8)
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- Electric Automobiles (7)
- Electric Inverters (7)
- Hybrid Electric Vehicles (7)
- Control Theory (6)
- Particle Swarm Optimization (6)
- Secondary Batteries (6)
- Adaptive Control (5)
- Electrostatic Discharge (5)
- Energy Storage (5)
- Fuzzy Control (5)
- Battery Powered Vehicles (4)
- Cavity Model (4)
- Electromagnetic Compatibility (4)
- Instruments (4)
- Invertors (4)
- Optimal Control (4)
- Optimization (4)
- Power Electronics (4)
- Power System Control (4)
- Power System Stability (4)
- STATCOM (4)
- Asynchronous Circuits (3)
- Capacitors (3)
- Channel Estimation (3)
- Control System Synthesis (3)
Articles 1 - 30 of 178
Full-Text Articles in Engineering
Thermal Modeling Of On-Chip Interconnects And 3d Packaging Using Em Tools, Lijun Jiang, Seshadri Kolluri, Barry J. Rubin, Howard Smith, Evan G. Colgan, Michael R. Scheuermann, Jamil A. Wakit, Alina Deutsch, Jason Gill
Thermal Modeling Of On-Chip Interconnects And 3d Packaging Using Em Tools, Lijun Jiang, Seshadri Kolluri, Barry J. Rubin, Howard Smith, Evan G. Colgan, Michael R. Scheuermann, Jamil A. Wakit, Alina Deutsch, Jason Gill
Electrical and Computer Engineering Faculty Research & Creative Works
The green (low power) chip design demands dramatic thermal and electrical simulation capabilities. In this paper, a novel thermal simulation approach for automatic thermal modeling of very large problems is introduced. This methodology can be fully integrated with existing solvers for electrical simulations, and make it possible to analyze practical on-chip and packaging thermal problems using the existing electromagnetic tools and geometry definitions, with very small additional effort. Its various applications to BEOL (on-chip wiring), thermal guideline design, and 3D integration (for multiple chip stacks) thermal modeling are investigated in this paper. We will demonstrate this capability with an automatic …
A Front End Switched Rectifier Dc Source For Neutral Point Balancing Of A Npc Three-Level Inverter For The Full Modulation Range, K. Siva Kumar, Sukumar De, K. Gopakumar, Gopal Mondal, Keith Corzine
A Front End Switched Rectifier Dc Source For Neutral Point Balancing Of A Npc Three-Level Inverter For The Full Modulation Range, K. Siva Kumar, Sukumar De, K. Gopakumar, Gopal Mondal, Keith Corzine
Electrical and Computer Engineering Faculty Research & Creative Works
A switched DC voltage three level NPC is proposed in this paper to eliminate capacitor balancing problems in conventional three-level Neutral Point Clamped (NPC) inverter. the proposed configuration requires only one DC link with a voltage Vdc/2, where Vdc is the DC link voltage in a conventional NPC inverter. to get rated DC link voltage (Vdc), the voltage source is alternately connected in parallel to one of the two series capacitors using two switches and two diodes with device voltage rating of Vdc/2. the frequency at which the voltage source is switched is independent and will not affect the operation …
Electromagnetic Emissions Stimulation And Detection System, Daryl G. Beetner, Sarah A. Seguin, Todd H. Hubing
Electromagnetic Emissions Stimulation And Detection System, Daryl G. Beetner, Sarah A. Seguin, Todd H. Hubing
Electrical and Computer Engineering Faculty Research & Creative Works
A system and method for detecting and identifying electronic devices based on their unintended electromagnetic emissions (“UEE”) signals is presented. During device classification, UEE signals are measured from a plurality of test devices and characteristic data is obtained from the UEE signal emitted from each test device. Using the characteristic data, a threshold value and ideal pulse template can be determined for each test device and stored in a memory. An ideal stimulation signal is also determined for each test device and stored in the memory. During device detection, the ideal stimulation signal is applied to the environment in which …
Neural-Network-Based State Feedback Control Of A Nonlinear Discrete-Time System In Nonstrict Feedback Form, Pingan He, Jagannathan Sarangapani
Neural-Network-Based State Feedback Control Of A Nonlinear Discrete-Time System In Nonstrict Feedback Form, Pingan He, Jagannathan Sarangapani
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a suite of adaptive neural network (NN) controllers is designed to deliver a desired tracking performance for the control of an unknown, second-order, nonlinear discrete-time system expressed in nonstrict feedback form. In the first approach, two feedforward NNs are employed in the controller with tracking error as the feedback variable whereas in the adaptive critic NN architecture, three feedforward NNs are used. In the adaptive critic architecture, two action NNs produce virtual and actual control inputs, respectively, whereas the third critic NN approximates certain strategic utility function and its output is employed for tuning action NN weights …
A Model Based Fault Detection And Prognostic Scheme For Uncertain Nonlinear Discrete-Time Systems, Balaje T. Thumati, Jagannathan Sarangapani
A Model Based Fault Detection And Prognostic Scheme For Uncertain Nonlinear Discrete-Time Systems, Balaje T. Thumati, Jagannathan Sarangapani
Electrical and Computer Engineering Faculty Research & Creative Works
A new fault detection and prognostics (FDP) framework is introduced for uncertain nonlinear discrete time system by using a discrete-time nonlinear estimator which consists of an online approximator. A fault is detected by monitoring the deviation of the system output with that of the estimator output. Prior to the occurrence of the fault, this online approximator learns the system uncertainty. In the event of a fault, the online approximator learns both the system uncertainty and the fault dynamics. A stable parameter update law in discrete-time is developed to tune the parameters of the online approximator. This update law is also …
Distribution System Operation And Planning In The Presence Of Distributed Generation Technology, Gavin W. Jones, Badrul H. Chowdhury
Distribution System Operation And Planning In The Presence Of Distributed Generation Technology, Gavin W. Jones, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
Distributed generation (DG) is becoming an increasingly attractive multi-faceted paradigm in the field of power distribution as economic and environmental factors drive new technologies to be more efficient and less polluting than their earlier counterparts. an attempt is made to examine and compare three types of DG: diesel generators, microturbines, and small wind turbines within the structure of a distribution system. the DG types are compared in both steady-state and transient operation to determine which type is suitable for a particular application. Steady-state operation is examined under heavy loading conditions and each DG type is compared on the basis of …
Development Of A New System Vulnerability Index - The Overload Risk Index, John Rossmaier, Badrul Chowdhury
Development Of A New System Vulnerability Index - The Overload Risk Index, John Rossmaier, Badrul Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes a new index to better determine the vulnerability of a power system. the procedure for calculating this index combines stochastic and probabilistic methods to determine the likelihood of a line overloading in a power system. the methods used include a basic load flow analysis using network security factors and Monte Carlo simulation that incorporates the likelihood of component failure within the system. a case study has been performed to analyze the ability of such an index in accurately measuring one aspect of power system vulnerability. Three different variations of this indexing method are explored in an attempt …
A Bist Technique For Crosstalk Noise Detection In Fpgas, Waleed K. Al-Assadi, Sindhu Kakarla
A Bist Technique For Crosstalk Noise Detection In Fpgas, Waleed K. Al-Assadi, Sindhu Kakarla
Electrical and Computer Engineering Faculty Research & Creative Works
As Integrated Circuits are migrated to more advanced technologies, it has become clear that crosstalk noise is an important phenomenon that must be taken into account. Also, crosstalk noise has emerged as a serious problem in recent years, because more and more devices and wires have been packed on electronic chips. Despite being more immune to crosstalk noise than their ASIC (Application Specific Integrated Circuit) counterparts, the dense interconnected structures of FPGAs (Field Programmable Gate Arrays) invite more vulnerabilities to crosstalk noise. Due to the lack of electrical detail concerning FPGA devices it is quite difficult to test the faults …
Secure Virtual Backbone-Based Power Management For Ad Hoc Networks, Hung Yuan Hsu, Ali R. Hurson
Secure Virtual Backbone-Based Power Management For Ad Hoc Networks, Hung Yuan Hsu, Ali R. Hurson
Electrical and Computer Engineering Faculty Research & Creative Works
Power saving is a critical issue in wireless ad hoc networks. Many of the existing energy efficient routing protocols utilize the power management feature provided by MAC layer (e.g., IEEE 802.11 PSM). the rationale behind these protocols is to power down (put in sleep) the redundant nodes that do not involve in the packets routing. to keep a low end-to-end latency and preserve the routing fidelity, a group of nodes are selected to constitute a virtual backbone throughout the network. the backbone nodes do not sleep all the time serving for the packets routing while the rest of nodes turn …
On The Mutual Information And Power Allocation For Vector Gaussian Channels With Finite Discrete Inputs, Chengshan Xiao, Yahong Rosa Zheng
On The Mutual Information And Power Allocation For Vector Gaussian Channels With Finite Discrete Inputs, Chengshan Xiao, Yahong Rosa Zheng
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, the mutual information and power allocation are discussed for vector Gaussian channels with finite discrete inputs. It is shown that the classic water filling and mercury-water filling policies, which are allocating power to a bank of independent parallel channels, may lead to significant loss compared to the original system without power allocation for finite discrete inputs. a generalized linear precoder, which is a non-diagonal and non-unitary matrix, is proposed for cross- channel power allocation to maximize the mutual information for vector channels. Numerical examples show that the new precoding-Based power allocation provides significant gain for a broad …
Time-Domain Receiver Design For Mimo Underwater Acoustic Communications, Jun Tao, Yahong Rosa Zheng, Chengshan Xiao, T. C. Yang, Wen Bin Yang
Time-Domain Receiver Design For Mimo Underwater Acoustic Communications, Jun Tao, Yahong Rosa Zheng, Chengshan Xiao, T. C. Yang, Wen Bin Yang
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we propose a time-domain receiver design scheme for high data rate single carrier multiple-input, multiple-output (MIMO) underwater acoustic communications. in this scheme, each received packet is artificially partitioned into blocks for processing. the MIMO channel is initially estimated using training blocks at the front of transmitted packets from all transducers. with the estimated MIMO channel, one data block following the training blocks is equalized. the phase rotation in the equalized data block is compensated by a group-wise phase correction operation, before symbol detection. the newly detected data block along with K - 1 previous data (or pilot) …
Proper Orthogonal Decomposition In The Generation Of Reduced Order Models For Interconnects, Wu Zhong Lin, Yao Jiang Zhang, Er Ping Li
Proper Orthogonal Decomposition In The Generation Of Reduced Order Models For Interconnects, Wu Zhong Lin, Yao Jiang Zhang, Er Ping Li
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, reduced order models are generated using the technique of proper orthogonal decomposition (POD), also known as Karhunen-Loève decomposition (KLD) for the simulations of interconnect problems. Model order reduction is achieved by projecting the state-space of the original problems onto a subspace spanned by a few numbers of proper orthogonal modes (POMs) extracted by the POD procedure from an ensemble of system responses at a series of selected frequencies. the proper orthogonal values (POVs) corresponding to the POMs indicate the level of the importance of each POM and provide a guidance for the number of POMs to be …
Damping Inter-Area Oscillations In Power Systems By Statcoms, Mahyar Zarghami, Mariesa Crow
Damping Inter-Area Oscillations In Power Systems By Statcoms, Mahyar Zarghami, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
Shunt FACTS devices such as STATCOMs are best known for their impact on reactive power flow in power networks. This is usually done by local reactive compensation which also regulates voltage magnitude of the bus to which the shunt FACTS device is connected. on the other hand, these devices are less known for their effect on active power flow. This paper discusses a novel approach for damping inter-area oscillations in a large power network using multiple STATCOMs. in the paper, it will be shown that these oscillations can be controlled by changing STATCOMs' bus voltage angles, hence regulating active power …
Optimizing Micro-Grid Operations In The Presence Of Wind Generation, Nikhil K. Ardeshna, Badrul H. Chowdhury
Optimizing Micro-Grid Operations In The Presence Of Wind Generation, Nikhil K. Ardeshna, Badrul H. Chowdhury
Electrical and Computer Engineering Faculty Research & Creative Works
Conceptually, a micro-grid can operate in parallel with the main grid system to support the grid voltage or as an isolated system to support customers isolated from the grid. in islanding operations, the micro-grid can continue to supply power to the customers thereby increasing the reliability of the power system. in a micro-grid with a significant percentage of wind power, a reactive power source would be needed to keep the wind power generating in islanded mode. the problem of load following is investigated in this situation. in addition, the use of Static Synchronous Compensator (STATCOM) and battery energy storage system …
A Circuit Model For Esd Performance Analysis Of Printed Circuit Boards, Byong-Su Seol, Jong-Sung Lee, Jae-Deok Lim, Hyungseok Lee, Harkbyeong Park, Argha Nandy, David Pommerenke
A Circuit Model For Esd Performance Analysis Of Printed Circuit Boards, Byong-Su Seol, Jong-Sung Lee, Jae-Deok Lim, Hyungseok Lee, Harkbyeong Park, Argha Nandy, David Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
This paper provides a SPICE-compatible circuit model for characterizing electrostatic discharge (ESD) clamping performance of protection devices mounted on printed circuit boards (PCBs). An equivalent circuit model for a commercial ESD generator is introduced and a simulation methodology of an ESD protection device with non-linear resistance characteristic using voltage controlled current source is described. These models combined to create a full circuit model with a PCB model in a SPICE-like circuit simulator. Comparison results between the simulated and measured are presented to verify the accuracy of the proposed circuit model. A trade-off analysis between the ESD clamping performance and signal …
Pmu Placement For Power System Observability Using Binary Particle Swarm Optimization, S. Chakrabarti, Ganesh K. Venayagamoorthy, E. Kyriakides
Pmu Placement For Power System Observability Using Binary Particle Swarm Optimization, S. Chakrabarti, Ganesh K. Venayagamoorthy, E. Kyriakides
Electrical and Computer Engineering Faculty Research & Creative Works
A binary particle swarm optimization (BPSO) based methodology for the optimal placement of phasor measurement units (PMUs) for complete observability of a power system is presented in this paper. The objectives of the optimization problem are to minimize the total number of PMUs required, and to maximize the measurement redundancy at the power system buses. Simulation results on the IEEE 14-bus and 30-bus test systems are presented in this paper.
Fully Evolvable Optimal Neurofuzzy Controller Using Adaptive Critic Designs, Salman Mohagheghi, Ganesh K. Venayagamoorthy, Ronald G. Harley
Fully Evolvable Optimal Neurofuzzy Controller Using Adaptive Critic Designs, Salman Mohagheghi, Ganesh K. Venayagamoorthy, Ronald G. Harley
Electrical and Computer Engineering Faculty Research & Creative Works
A near-optimal neurofuzzy external controller is designed in this paper for a static compensator (STATCOM) in a multimachine power system. The controller provides an auxiliary reference signal for the STATCOM in such a way that it improves the damping of the rotor speed deviations of its neighboring generators. A zero-order Takagi-Sugeno fuzzy rule base constitutes the core of the controller. A heuristic dynamic programming (HDP) based approach is used to further train the controller and enable it to provide nonlinear near-optimal control at different operating conditions of the power system. Based on the connectionist systems theory, the parameters of the …
Neural Network Output Feedback Control Of A Quadrotor Uav, Jagannathan Sarangapani, Travis Alan Dierks
Neural Network Output Feedback Control Of A Quadrotor Uav, Jagannathan Sarangapani, Travis Alan Dierks
Electrical and Computer Engineering Faculty Research & Creative Works
A neural network (NN) based output feedback controller for a quadrotor unmanned aerial vehicle (UAV) is proposed. The NNs are utilized in the observer and for generating virtual and actual control inputs, respectively, where the NNs learn the nonlinear dynamics of the UAV online including uncertain nonlinear terms like aerodynamic friction and blade flapping. It is shown using Lyapunov theory that the position, orientation, and velocity tracking errors, the virtual control and observer estimation errors, and the NN weight estimation errors for each NN are all semi-globally uniformly ultimately bounded (SGUUB) in the presence of bounded disturbances and NN functional …
Correlation Between Eut Failure Levels And Esd Generator Parameters, Jayong Koo, Qing Cai, Kai Wang, J. Maas, T. Takahashi, Andrew Martwick, David Pommerenke
Correlation Between Eut Failure Levels And Esd Generator Parameters, Jayong Koo, Qing Cai, Kai Wang, J. Maas, T. Takahashi, Andrew Martwick, David Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
Some system-level electrostatic discharge (ESD) tests repeat badly if different ESD generators are used. For improving repeatability, ESD generator specifications have been changed, and modified generators have been compared in a worldwide round robin test. The test showed up to 1 : 3 variations of failure levels. Multiple parameters that characterize ESD generators have been measured. This paper correlates the parameters to test result variations trying to distinguish between important and nonrelevant parameters. The transient fields show large variations among different ESD generators. A correlation has been observed in many equipment under tests (EUTs) between failure levels and the spectral …
Intelligent Scheduling Of Hybrid And Electric Vehicle Storage Capacity In A Parking Lot For Profit Maximization In Grid Power Transactions, Chris Huston, Ganesh K. Venayagamoorthy, Keith Corzine
Intelligent Scheduling Of Hybrid And Electric Vehicle Storage Capacity In A Parking Lot For Profit Maximization In Grid Power Transactions, Chris Huston, Ganesh K. Venayagamoorthy, Keith Corzine
Electrical and Computer Engineering Faculty Research & Creative Works
This paper proposes an intelligent method for scheduling usage of available energy storage capacity from plugin hybrid electric vehicles (PHEV) and electric vehicles (EV). The batteries on these vehicles can either provide power to the grid when parked, known as vehicle- to-grid (V2G) concept or take power from the grid to charge the batteries on the vehicles. A scalable parking lot model is developed with different parameters assigned to fleets of vehicles. The size of the parking lot is assumed to be large enough to accommodate the number of vehicles performing grid transactions. In order to figure out the appropriate …
A Variable-Order Flom Algorithm For Heavy-Tailed Clutter Suppression, Y. Rosa Zheng
A Variable-Order Flom Algorithm For Heavy-Tailed Clutter Suppression, Y. Rosa Zheng
Electrical and Computer Engineering Faculty Research & Creative Works
The normalized fractionally-lower order moment (FLOM) algorithm exhibits fast convergence but high excess mean squared error (MSE) when the order is less than 2. This paper proposes a method using variable order moments to adaptively changing the order during adaptation, thus achieving both fast initial convergence and low excess MSE in the steady state. The algorithm is applied to both Gaussian and heavy-tailed non-Gaussian clutter suppression in phased array applications. The results show better performances of the proposed algorithm over the normalized FLOM and normalized Least Mean Square (NLMS) algorithms. The proposed algorithm also performs well in other adaptive filtering …
Non-Destructive Testing Of Physical Characteristics Of Composite Structures, R. Zoughi, Sergey Kharkovsky, Vivian Stephen
Non-Destructive Testing Of Physical Characteristics Of Composite Structures, R. Zoughi, Sergey Kharkovsky, Vivian Stephen
Electrical and Computer Engineering Faculty Research & Creative Works
A method for detecting an anomaly in a composite material comprising directing two transmitted electromagnetic wave signals orthogonally polarized with respect to each other from a probe to the composite material, wherein the probe and composite material are positioned for near-field evaluation of the probe. A related apparatus comprising an open-ended square waveguide probe.
New Power Quality Index In A Distribution Power System By Using Rmp Model, Soon Lee, Jung-Wook Park, Ganesh K. Venayagamoorthy
New Power Quality Index In A Distribution Power System By Using Rmp Model, Soon Lee, Jung-Wook Park, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a new power quality index (PQI), which is directly related to the generation of distortion power from nonlinear harmonic loads, is introduced to determine their harmonic pollution ranking in a distribution power system. The electric load composition rate (LCR) and the total harmonic distortion (THD) for the estimated currents on each harmonic load are used to define the proposed PQI. The reduced multivariate polynomial (RMP) model with one-shot training property is applied to realize the PQI. Then, the ranking of distortion power for each nonlinear load, which have adverse effect on the entire system, is determined. It …
Real-Time Implementation Of Intelligent Modeling And Control Techniques On A Plc Platform, Curtis Alan Parrott, Ganesh K. Venayagamoorthy
Real-Time Implementation Of Intelligent Modeling And Control Techniques On A Plc Platform, Curtis Alan Parrott, Ganesh K. Venayagamoorthy
Electrical and Computer Engineering Faculty Research & Creative Works
Programmable logic controllers (PLCs) have been used for many decades for standard control in industrial and factory environments. Over the years, PLCs have become computational efficient and powerful, and a robust platform with applications beyond the standard control and factory automation. Due to the new advanced PLC's features and computational power, they are ideal platforms for exploring advanced modeling and control methods, including computational intelligence based techniques such as neural networks, particle swarm optimization (PSO) and many others. Some of these techniques require fast floating-point calculations that are now possible in real-time on the PLC. This paper focuses on the …
Decision Theory On Dynamic Domains Nabla Derivatives And The Hamilton-Jacobi-Bellman Equation, John E. Seiffertt Iv, Donald C. Wunsch, Suman Sanyal
Decision Theory On Dynamic Domains Nabla Derivatives And The Hamilton-Jacobi-Bellman Equation, John E. Seiffertt Iv, Donald C. Wunsch, Suman Sanyal
Electrical and Computer Engineering Faculty Research & Creative Works
The time scales calculus, which includes the study of the nabla derivatives, is an emerging key topic due to many multidisciplinary applications. We extend this calculus to Approximate Dynamic Programming. In particular, we investigate application of the nabla derivative, one of the fundamental dynamic derivatives of time scales. We present a nabla-derivative based derivation and proof of the Hamilton-Jacobi-Bellman equation, the solution of which is the fundamental problem in the field of dynamic programming. By drawing together the calculus of time scales and the applied area of stochastic control via Approximate Dynamic Programming, we connect two major fields of research.
Novel Dynamic Representation And Control Of Power Networks Embedded With Facts Devices, Shahab Mehraeen, Jagannathan Sarangapani, Mariesa Crow
Novel Dynamic Representation And Control Of Power Networks Embedded With Facts Devices, Shahab Mehraeen, Jagannathan Sarangapani, Mariesa Crow
Electrical and Computer Engineering Faculty Research & Creative Works
FACTS devices have been shown to be powerful in damping power system oscillations caused by faults; however, in the multi machine control using FACTS, the control problem involves solving differential-algebraic equations of a power network which renders the available control schemes ineffective due to heuristic design and lack of know how to incorporate FACTS into the network. A method to generate nonlinear dynamic representation of a power system consisting of differential equations alone with universal power flow controller (UPFC) is introduced since differential equations are typically preferred for controller development. Subsequently, backstepping methodology is utilized to reduce the generator oscillations …
A Model Based Fault Detection Scheme For Nonlinear Multivariable Discrete-Time Systems, Balaje T. Thumati, Jagannathan Sarangapani
A Model Based Fault Detection Scheme For Nonlinear Multivariable Discrete-Time Systems, Balaje T. Thumati, Jagannathan Sarangapani
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a novel robust scheme is developed for detecting faults in nonlinear discrete time multi-input and multi-output systems in contrast with the available schemes that are developed in continuous-time. Both state and output faults are addressed by considering separate time profiles. The faults, which could be incipient or abrupt, are modeled using input and output signals of the system. By using nonlinear estimation techniques, the discrete-time system is monitored online. Once a fault is detected, its dynamics are characterized using an online approximator. A stable parameter update law is developed for the online approximator scheme in discrete-time. The …
A New Walking Pattern Svm Technique For Five-Phase Motor Drives, Jing Huang, Keith Corzine
A New Walking Pattern Svm Technique For Five-Phase Motor Drives, Jing Huang, Keith Corzine
Electrical and Computer Engineering Faculty Research & Creative Works
As multi-phase motor drives become more popular and practical, new research in this area investigates potential advantages including lower torque ripple and better power density. The added dimensions of a multi-phase machine leads to a completely different operating nature than standard three-phase machines and merits research into new modulation methods. The five-phase and six-phase machines have been traditionally studied in the literature applying voltage-source modulation methods such as sine-triangle modulation and space- vector modulation for current harmonic elimination. Recent research of five-phase induction motor drives addressed nearest three vectors switching; which adds current harmonics but lowers torque ripple and considerably …
Eliminating Via-Plane Coupling Using Ground Vias For High-Speed Signal Transitions, Songping Wu, Xin Chang, Christian Schuster, Xiaoxiong Gu, Jun Fan
Eliminating Via-Plane Coupling Using Ground Vias For High-Speed Signal Transitions, Songping Wu, Xin Chang, Christian Schuster, Xiaoxiong Gu, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
When a high-speed signal transits through a via that penetrates a plane pair, parallel-plane resonances can cause additional insertion loss for the signal. To eliminate this via-plane coupling, ground vias are added adjacent to the signal via. This paper discusses the impact of the ground vias as a function of the number of the ground vias, their locations, and the size of the plane pair. A block-by-block physics-based equivalent circuit modeling approach is used in the study. The underlying physics of the phenomenon and the design implications are also discussed in the paper.
Hardware Implementation Of An Ais-Based Optimal Excitation Controller For An Electric Ship, Chuan Yan, Ganesh K. Venayagamoorthy, Keith Corzine
Hardware Implementation Of An Ais-Based Optimal Excitation Controller For An Electric Ship, Chuan Yan, Ganesh K. Venayagamoorthy, Keith Corzine
Electrical and Computer Engineering Faculty Research & Creative Works
The operation of high energy loads on Navy's future electric ships, such as directed energy weapons, will cause disturbances in the main bus voltage and impact the operation of the rest of the power system when the pulsed loads are directly powered from the main dc bus. This paper describes an online design and laboratory hardware implementation of an optimal excitation controller using an artificial immune system (AIS) based algorithm. The AIS algorithm, a clonal selection algorithm (CSA), is used to minimize the effects of pulsed loads by improved excitation control and thus, reduce the requirement on energy storage device …