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Performance And Mitigation Strategy Of Distributed Ac-Stacked Pv Inverter Architecture Under Grid Background Harmonics, Namwon Kim, Hamidreza Jafarian, Babak Parkhideh, Johan Enslin 2017 University of North Carolina at Charlotte

Performance And Mitigation Strategy Of Distributed Ac-Stacked Pv Inverter Architecture Under Grid Background Harmonics, Namwon Kim, Hamidreza Jafarian, Babak Parkhideh, Johan Enslin

Hamidreza Jafarian

Grid-tied Photovoltaic (PV) inverters are required to have harmonics mitigation control to reduce harmonics distortion on the output current caused by the impact of grid background harmonics. In this paper, a decentralized control strategy for reduction of the impact of distorted grid voltage on the AC-stacked PV inverter architecture is proposed. Two control schemes with the selective harmonics mitigation strategy and without any handshaking among the inverters are proposed for this architecture and analyzed to present the improvement of the power quality as well as the operating margin of the architecture. The proposed methods are analyzed by impedance analysis and ...


A Distributed Active And Reactive Power Control For Grid-Tied Cascaded H-Bridge Pv Inverter System Using Relative Gain Array Approach, Hamidreza Jafarian, Namwon Kim, Babak Parkhideh 2017 University of North Carolina at Charlotte

A Distributed Active And Reactive Power Control For Grid-Tied Cascaded H-Bridge Pv Inverter System Using Relative Gain Array Approach, Hamidreza Jafarian, Namwon Kim, Babak Parkhideh

Hamidreza Jafarian

The main objective of this paper is to propose a decentralized control approach for active and reactive power control of grid-tied cascaded H-bridge PV inverter architecture. The decentralized controller allows fully distributed architecture both in terms of control and physical implementation of a PV system, resulting in higher reliability and potentially lower cost. The proposed control approach not only maintaining the balance of the system but also by sending supervisory commands to only one inverter minimizes the required communications for controlling active and reactive power. Detailed modeling and analysis are provided to show the feasibility of the proposed decentralized approach ...


Design Of Dc-Link Vscf Ac Electrical Power System For The Embraer 190/195 Aircraft, Eduardo Francis Carvalho Freitas, Nihad E. Daidzic, 2017 ETEP – Faculdade de Tecnologia de São José dos Campos, Brazil

Design Of Dc-Link Vscf Ac Electrical Power System For The Embraer 190/195 Aircraft, Eduardo Francis Carvalho Freitas, Nihad E. Daidzic,

Journal of Aviation Technology and Engineering

A proposed novel DC-Link VSCF AC-DC-AC electrical power system converter for Embraer 190/195 transport category airplane is presented. The proposed converter could replace the existing conventional system based on the CSCF IDGs. Several contemporary production airplanes already have VSCF as a major or backup source of electrical power. Problems existed with the older VSCF systems in the past; however, the switched power electronics and digital controllers have matured and can be now, in our opinion, safely integrated and replace existing constant-speed hydraulic transmissions powering CSCF AC generators. IGBT power transistors for medium-level power conversion and relatively fast efficient switching ...


Swing Contracts With Dynamic Reserves For Flexible Service Management, Shanshan Ma, Zhaoyu Wang, Leigh Tesfatsion 2017 Iowa State University

Swing Contracts With Dynamic Reserves For Flexible Service Management, Shanshan Ma, Zhaoyu Wang, Leigh Tesfatsion

Economics Working Papers

The increasing penetration of variable energy resources in modern electric power systems requires additional flexibility in ancillary service provision to maintain reliable and efficient grid operations. However, full recognition and appropriate compensation of this flexibility is difficult to ensure within current power market designs due to rigidities in service definitions and requirements. For example, reserve requirements (RRs) are typically set in advance at administratively determined levels. If RRs are too large, wasteful expenditures result; and, if RRs are too small, high real-time costs are incurred for peak generation and/or load curtailment. To address these problems, this paper proposes a ...


Fault Location In High Voltage Shunt Capacitor Banks, Hessamoddin Jouybari Moghaddam 2017 The University of Western Ontario

Fault Location In High Voltage Shunt Capacitor Banks, Hessamoddin Jouybari Moghaddam

Electronic Thesis and Dissertation Repository

High Voltage Shunt Capacitor Banks (HV-SCBs) are critical substation assets that are primarily used to improve power factor and thus power transmission capability. Over temperature, over voltages, manufacturing defects can cause internal failures of capacitor elements. With today’s sensitive protection available in numerical relays these failures will be detected and SCBs will be taken out of service. But determining the phase and section in which capacitor elements have failed is important for utilities to decrease downtime of SCBs. This thesis proposes methods to address the challenges in fault location of SCBs. The proposed methods apply calibrating factors that compensate ...


Radcool: A Web-Enabled Simulation Tool For Radiative Cooling, Yu-wen Lin, Evan L. Schlenker, Zhiguang Zhou, Peter Bermel 2017 Georgia Institute of Technology

Radcool: A Web-Enabled Simulation Tool For Radiative Cooling, Yu-Wen Lin, Evan L. Schlenker, Zhiguang Zhou, Peter Bermel

The Summer Undergraduate Research Fellowship (SURF) Symposium

Thermophotovoltaic (TPV) systems can generate electricity from high-temperature heat sources via thermal radiation. However, the intense heating of a photovoltaic (PV) cell can greatly reduce the overall efficiency of the system. Therefore, it is critical to develop techniques to keep the PV cells close to ambient temperature without consuming energy. Radiative cooling is a passive technique that dissipates heat into remote space via thermal radiation. A simulation tool to predict the performance of radiative cooling systems would be particularly helpful in designing new experiments. The current TPV model simulation tool, TPVexpt, can calculate the theoretical performance of the TPV system ...


Carbon Removal And Optoelectronic Property Tuning In Copper Arsenic Sulfide Thin Films Through Ligand Exchange And Alloying, Louis R. Schroeder, Scott McClary, Rakesh Agrawal 2017 Purdue University

Carbon Removal And Optoelectronic Property Tuning In Copper Arsenic Sulfide Thin Films Through Ligand Exchange And Alloying, Louis R. Schroeder, Scott Mcclary, Rakesh Agrawal

The Summer Undergraduate Research Fellowship (SURF) Symposium

Solution processed thin film solar cells are attractive alternatives to conventional energy sources due to low waste generation, flexibility in substrate choice, and scalability. The novel semiconductor Cu3AsS4 in the enargite phase has a near ideal band gap of 1.4 eV and has earth abundant constituent elements; yet single-junction solar cells have yielded low efficiencies due to a secondary carbonaceous phase present, among other issues. This carbonaceous phase may be eliminated by exchanging the carbonaceous ligands with molecular metal chalcogenides. To characterize the ligand exchanged particles, UV-Vis-NIR spectroscopy, Raman spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy ...


Thermal Characterization Of Magnetic Components, Jiazhou Zhong, Veda Samhitha Duppalli, Scott D. Sudhoff Professor 2017 Purdue University

Thermal Characterization Of Magnetic Components, Jiazhou Zhong, Veda Samhitha Duppalli, Scott D. Sudhoff Professor

The Summer Undergraduate Research Fellowship (SURF) Symposium

Thermal limits are crucial constraints in the design of power magnetic components. As the power density of magnetic components continues to increase, cooling becomes more critical. Our research focuses on solving for the amount of cooling needed for a particular magnetic component. During the research process, a low-velocity wind tunnel designed and built from the ground up is used to form uniform and controlled conditions for the test components. Thermal Equivalent Circuit (TEC) and parameter identification techniques are used in conjunction to yield temperature distribution results. The expected result is temperature data on various areas of the component under different ...


Predictive Energy Management Of Islanded Microgrids With Photovoltaics And Energy Storage, Dennis G. Michaelson 2017 The University of Western Ontario

Predictive Energy Management Of Islanded Microgrids With Photovoltaics And Energy Storage, Dennis G. Michaelson

Electronic Thesis and Dissertation Repository

Islanded microgrids powered primarily by photovoltaic (PV) arrays present a challenging control problem due to the intermittent production and the relatively close scale between the sources and the loads. Energy storage in such microgrids plays an important role in balancing supply with demand, and in extending operation during periods when the PV supply is not available or insufficient. The efficient operation of such microgrids requires effective management of all resources. A predictive energy management strategy can potentially avoid or effectively mitigate upcoming outages. This thesis presents an energy management system (EMS) for such microgrids. The EMS uses a predictive approach ...


The Impact Of Power Curve Estimation On Commercial Wind Power Forecasts - An Empirical Analysis, Gianni Goretti, Aidan Duffy, Tek Tjing Lie 2017 Dublin Institute of Technology

The Impact Of Power Curve Estimation On Commercial Wind Power Forecasts - An Empirical Analysis, Gianni Goretti, Aidan Duffy, Tek Tjing Lie

Conference papers

An increasing number of utilities participating in the energy market require short term (i.e. up to 48 hours) power forecasts for renewable generation in order to optimize technical and financial performances. As a result, a large number of forecast providers now operate in the marketplace, each using different methods and offering a wide range of services. This paper assesses five different day-ahead wind power forecasts generated by various service providers currently operating in the market, and compares their performance against the state-of-the-art of short-term wind power forecasting. The work focuses on how power curve estimations can introduce systematic errors ...


Design & Evaluation Of A Hybrid Switched Capacitor Circuit With Wide-Bandgap Devices For Dc Grid Applications, Joshua L. Stewart 2017 University of New Mexico

Design & Evaluation Of A Hybrid Switched Capacitor Circuit With Wide-Bandgap Devices For Dc Grid Applications, Joshua L. Stewart

Electrical and Computer Engineering ETDs

ABSTRACT

As technologies advance, the rate at which renewable power sources, such as solar photovoltaic (PV) and wind, are being added to the power grid is increasing. Typically, PV power plants require large inverters for direct current to alternating current (DC-AC) power conversion, as well as large transformers to step up voltages to the grid voltage. Offshore wind farms and large PV power plants in remote locations often aggregate power on a DC bus in order to improve efficiency and reduce the cost of power conversion hardware within the energy complex. However, the power must still be converted to AC ...


Loss Model For Gallium Nitride Dc-Dc Buck Converter, Rushi P. Patel 2017 Mississippi State University

Loss Model For Gallium Nitride Dc-Dc Buck Converter, Rushi P. Patel

Pursuit - The Journal of Undergraduate Research at the University of Tennessee

In recent years, more research has been done on Enhancement Mode Gallium Nitride (eGaN) converters, as the world is moving towards more power efficient converters. Power converters play a major role in efficiently controlling and converting electric energy used by machines, systems, and everyday products. The process to make converters more efficient was complicated and slow in the twentieth century. One of the important aspects in power electronics is to evaluate different losses and minimize losses to achieve high efficiency of the converter. With help of simulation tools such as MATLAB and LTspice, this process has become much faster and ...


Smart And Sustainable Aquaponics, Ryan Toal, Kevin Claggett, Justin Goh 2017 Santa Clara University

Smart And Sustainable Aquaponics, Ryan Toal, Kevin Claggett, Justin Goh

Electrical Engineering Senior Theses

As the global population increases, new ways of sustainable and efficient food production need to be explored in order to meet the growing demand from society. In this paper we explore the methods and functionality of an off-grid, semi-autonomous aquaponics system. This system will serve as a proof of concept for a large scale aquaponics system which can be modelled in other parts of the world where arable land is scarce. It was found that though the initial startup costs are high, it will be able to reduce the cost of food in the long run. The system implements a ...


The Solar Microgrid Project In Togo, Christian Jason Wintery, Alexander Mayorkis 2017 Santa Clara University

The Solar Microgrid Project In Togo, Christian Jason Wintery, Alexander Mayorkis

Electrical Engineering Senior Theses

Danyi Mempassem, Togo, Africa has villagers in need of electricity, however, they cannot afford to put in the infrastructure and then pay the steep cost of energy from the government. The best option for energy for the village is an affordable and renewable resource but due to limitations of geography the only viable option is a photo-voltaic system. We designed a working solar microgrid tailored for the location and weather of the village which can support all of the lights, cell phone chargers, and televisions that the villagers need/desire while being reliable, sustainable, safe, and affordable. The design and ...


Jump Linear Quadratic Control For Energy Management Of An Isolated Microgrid, Nathaniel Tucker 2017 Santa Clara University

Jump Linear Quadratic Control For Energy Management Of An Isolated Microgrid, Nathaniel Tucker

Electrical Engineering Master's Theses

Energy security and the aging grid infrastructure in the United States are two important subjects at the crossroads between politics and technology. One proposed solution to these two issues revolves around the concept of an isolated microgrid. Isolated microgrids are becoming increasingly popular combining multiple energy generation and storage systems to diversify and secure their private energy portfolios. The work presented in this thesis applies jump linear quadratic control to the energy management of an isolated microgrid operating with solar generation, fuel cell, and battery energy storage system. A continuous finite state Markov chain is used to model the intermittent ...


A Multiperiod Generalized Network Flow Model Of The U.S. Integrated Energy System: Part I—Model Description, Ana Quelhas, Esteban Gil, James D. McCalley, Sarah M. Ryan 2017 Iowa State University

A Multiperiod Generalized Network Flow Model Of The U.S. Integrated Energy System: Part I—Model Description, Ana Quelhas, Esteban Gil, James D. Mccalley, Sarah M. Ryan

James McCalley

This paper is the first of a two-part paper presenting a multiperiod generalized network flow model of the integrated energy system in the United States. Part I describes the modeling approach used to evaluate the economic efficiencies of the system-wide energy flows, from the coal and natural gas suppliers to the electric load centers. Under the proposed problem formulation, fuel supply and electricity demand nodes are connected via a transportation network, and the model is solved for the most efficient allocation of quantities and corresponding prices. The methodology includes physical, economic, and environmental aspects that characterize the different networks. Part ...


Smart Grid Technology In The Developing World, Jacob R. Young 2017 Seattle Pacific University

Smart Grid Technology In The Developing World, Jacob R. Young

Honors Projects

A smart grid is the integration of communication and information technologies with contemporary power infrastructure to enhance load service and to incorporate continually evolving end-use applications. It is the latest advancement in the areas of power generation, transmission and distribution. It has advanced beyond the traditional grid structure at every stage; a smart grid is capable of incorporating distributed generation (DG) renewable sources and has improved transmission capabilities through implementation of technologies such as Flexible AC Transmission Systems (FACTS). Through the addition of control technology in the distribution network a smart grid is able to implement “self-healing” and other methods ...


Shaping A Functional And Sustainable Biofuels Industry Through Bridging Industrial Needs With Farmer Production Capabilities, Richard M. Cruse, James Richardson, Carl Herndl, Mack C. Shelley II, Elena Yu Polush, Brent H. Shanks, Carl Roberts 2017 Iowa State University

Shaping A Functional And Sustainable Biofuels Industry Through Bridging Industrial Needs With Farmer Production Capabilities, Richard M. Cruse, James Richardson, Carl Herndl, Mack C. Shelley Ii, Elena Yu Polush, Brent H. Shanks, Carl Roberts

Brent H Shanks

In order for the biofuels industry to survive and succeed, it will need the cooperation of Iowa farmers to supply biomass. Farmers have concerns about production that need to be addressed in order to create a sustainable industry.


Marine Gastrobot Final Design Report, Wesley B. Williams, Eric Kane Dreischerf, Tommy Nicholas Yath 2017 California Polytechnic State University, San Luis Obispo

Marine Gastrobot Final Design Report, Wesley B. Williams, Eric Kane Dreischerf, Tommy Nicholas Yath

Mechanical Engineering

The Marine Gastrobot sponsored by Dr. Christopher Kitts of the Cal Poly Center for Applications in Biotechnology was a research and development effort intended to explore the use of microbial fuel cell technology as a power source for underwater robots. Our team Ocean Locomotion succeeded in developing a first iteration of an underwater robotic platform suitable for microbial fuel cell integration. The primary feature of the design is its sinusoidal fin propulsion intended for benthic exploration with limited risk of entanglement. During the course of development, Ocean Locomotion explored the use of low power actuation methods and determined their limited ...


Mini High Temperature Test Unit Final Design Report, Juan P. Castillo, Kevin Liu 2017 California Polytechnic State University, San Luis Obispo

Mini High Temperature Test Unit Final Design Report, Juan P. Castillo, Kevin Liu

Mechanical Engineering

Lawrence Livermore National Laboratory has invested considerable effort to develop new standard for nuclear grade HEPA filters that can withstand high temperatures along with methods to optimally test not only the experimental filter media, but also new frame seals and media binders. Therefore, LLNL in collaboration with Cal Poly has designed and built a Mini High Temperature Testing Unit (MHTTU) to recreate conditions observed during a fire and to test different materials in an effective, inexpensive, regulated and reliable method. The existing prototype was unable to achieve the ideal testing conditions of 1000°F air at the low flow rates ...


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