Open Access. Powered by Scholars. Published by Universities.®

Power and Energy Commons

Open Access. Powered by Scholars. Published by Universities.®

2,580 Full-Text Articles 3,741 Authors 2,898,424 Downloads 120 Institutions

All Articles in Power and Energy

Faceted Search

2,580 full-text articles. Page 1 of 113.

Solar Solution For Mini-Rover, Michaella Ochotorena, Derick Louie, Jonathan Cederquist, Collin Petersen, Cole Korchek 2022 California Polytechnic State University, San Luis Obispo

Solar Solution For Mini-Rover, Michaella Ochotorena, Derick Louie, Jonathan Cederquist, Collin Petersen, Cole Korchek

Mechanical Engineering

This project focuses on designing, building, and testing a functional prototype of a collapsible solar array on the mini Mars rover being developed by client and sponsor, Mr. Rich Murray. Although many previous collapsible solar arrays have been deployed for space missions, the previous solar-powered Mars rovers only deployed their arrays once upon landing. This solar array will be able to collapse and deploy multiple times to allow for greater rover mobility and stability when the rover is not charging. This system is critical to the success of the rover project because it provides power without which the rover cannot ...


Hybrid Ac/Dc Light Bulb, Celina Mendez, Kristian Vincent Cruz, Nouman Baryal 2022 California Polytechnic State University, San Luis Obispo

Hybrid Ac/Dc Light Bulb, Celina Mendez, Kristian Vincent Cruz, Nouman Baryal

Electrical Engineering

A hybrid AC/DC house aims to maximize the use of AC electricity from the utility grid and DC electricity from renewable energy sources such as roof-top solar panels. The hybrid system will therefore improve the reliability of the electrical by enabling power to be delivered to the loads even when one of the sources is not operational. One of the critical loads that every house needs is lighting. The hybrid AC/DC system should therefore be reliably facilitating the power delivery to the lighting. In this project, a localized hybrid AC/DC for LED light bulbs is designed and ...


Microgrid Energy Storage Branch, Evan Luu, Jeffrey Shieh 2022 California Polytechnic State University, San Luis Obispo

Microgrid Energy Storage Branch, Evan Luu, Jeffrey Shieh

Electrical Engineering

The microgrid is the future for the electrical utility system. Because of this, future power engineers need to be well-versed in this topic when they go into industry. Cal Poly has created a microgrid laboratory for this very purpose. However, it is missing its battery based energy storage branch. Due to safety concerns, a traditional chemical battery is not suitable for student use. In order to maintain Cal Poly’s learn-by-doing approach, an alternative solution must be implemented. A regenerative power supply meets the criteria for student use. It is capable of simulating the sinking and sourcing capabilities of a ...


Smart Usb-C Wall Plug For The Dc House Project, Ridge Lahti, Dino Maslic 2022 California Polytechnic State University, San Luis Obispo

Smart Usb-C Wall Plug For The Dc House Project, Ridge Lahti, Dino Maslic

Electrical Engineering

DC operated devices and appliances powered by AC systems suffer inefficiencies resulting from the losses of converting AC energy into DC energy. At Cal Poly, the DC House Project aims to minimize the need for AC electricity in homes and encourage the use of renewable energy systems. The DC House uses a 48V DC bus that must be stepped down for use with increasing number of DC loads in a typical home. In this project, a Smart USB-C Wall Plug is designed to work with USB Power Delivery to provide a variable voltage output for use with these DC loads ...


Controlling Temperature Of Dc-Dc Converter Using Switching Frequency Adjustment, Sajjad Ahsan, Arsalan Mughal, Mark Rapiz 2022 California Polytechnic State University, San Luis Obispo

Controlling Temperature Of Dc-Dc Converter Using Switching Frequency Adjustment, Sajjad Ahsan, Arsalan Mughal, Mark Rapiz

Electrical Engineering

As DC-DC converter operates under different load conditions, the amount of loss within the converter varies accordingly. Consequently the temperature of the DC-DC converter will also change based on the load demand. For PWM based DC-DC converters, one factor that contributes to the loss; thus, the increase in temperature is the switching frequency at which the converter operates. The higher the switching frequency used, the bigger the switching loss and in turn the hotter the converter. In this project, the temperature of a DC-DC converter is controlled by changing the switching frequency used by the converter. The hardware investigation used ...


Hybrid Ac/Dc House: The Road To A Sustainable Future, Nicholas McAdams, Luis Rodriguez 2022 California Polytechnic State University, San Luis Obispo

Hybrid Ac/Dc House: The Road To A Sustainable Future, Nicholas Mcadams, Luis Rodriguez

Electrical Engineering

The Hybrid AC/DC house is a sustainable alternative to preexisting residential power systems. The implementation of a DC bus in current homes will allow inefficient DC-AC and AC-DC conversions to be circumvented. This provides a direct path for current to flow to DC loads from DC sources such as solar panels to minimize power losses. In doing so, this will give users the ability to power their homes strictly from renewable sources and substantially decrease reliance on the utility. For this purpose, the hybrid AC/DC house is also designed in such a way to be entirely grid-independent to ...


Multifamily Complex Smart Locks For Property Management And Tenant Security, April Mills, Allen Chen, Dana Kumamoto, Michael Cook 2022 California Polytechnic State University, San Luis Obispo

Multifamily Complex Smart Locks For Property Management And Tenant Security, April Mills, Allen Chen, Dana Kumamoto, Michael Cook

Mechanical Engineering

Maintaining and managing hundreds of locks and physical keys for an apartment complex can be time consuming and costly, especially when the apartments turn over to new tenants. Our goal was to develop a smart door lock that is compatible with Obodo’s management app for apartment complexes to make accessing apartments secure and simpler for tenants and easier to manage for owners.

We designed and manufactured one smart door lock that is powered with four AA batteries and utilizes a dynamic NFC device and Bluetooth technology. The board can enter a sleep mode which reduces power consumption. The dynamic ...


Total Sky Imager Project, Ryan D. Maier, Benjamin Jack Forest, Kyle X. McGrath 2022 California Polytechnic State University, San Luis Obispo

Total Sky Imager Project, Ryan D. Maier, Benjamin Jack Forest, Kyle X. Mcgrath

Mechanical Engineering

Solar farms like the Gold Tree Solar Farm at Cal Poly San Luis Obispo have difficulty delivering a consistent level of power output. Cloudy days can trigger a significant drop in the utility of a farm’s solar panels, and an unexpected loss of power from the farm could potentially unbalance the electrical grid. Being able to predict these power output drops in advance could provide valuable time to prepare a grid and keep it stable. Furthermore, with modern data analysis methods such as machine learning, these predictions are becoming more and more accurate – given a sufficient data set. The ...


Sunsation’S Solar Powered Picnic Table, Michelle M. Barnett, Christopher Barber, Casey Durham, David Mason 2022 California Polytechnic State University, San Luis Obispo

Sunsation’S Solar Powered Picnic Table, Michelle M. Barnett, Christopher Barber, Casey Durham, David Mason

Mechanical Engineering

Team SunSation is an interdisciplinary senior design project group that was tasked with developing a semi-permanent seating area for Cal Poly's electrical engineering courtyard. The EE courtyard is populated with plastic folding tables and chairs that are slowly falling apart. Dale Dolan, the head of the EE department, requested that a table design be developed that incorporates the use of solar panels. The addition of the solar panels to the table would help promote clean renewable energy as well as provide shade to those sitting in the courtyard.

The solution that SunSation arrived at is broken up into mechanical ...


Skip The Grid: Giving Power To Navajo Nation, Ryan J. Schacherbauer 2022 California Polytechnic State University, San Luis Obispo

Skip The Grid: Giving Power To Navajo Nation, Ryan J. Schacherbauer

Construction Management

Skip the Grid is a project organized by Heart of America, a nonprofit, looking to improve the education and overall wellbeing of children and their families. Many residents within Navajo Nation do not have access to continuous power and rely on temporary generators or car battery to obtain any kind of electricity. Heart of America partnered with the Red Mesa School District to identify families that did not have power, which was impacting the children’s ability to complete their online schoolwork. This senior project was comprised of an interdisciplinary team responsible for installing a working solar system on twelve ...


Effective Green Marketing Strategies On Social Media: Selling Companies And Their Consumers On Investing In Carbon Offsetting And Solar Energy In 2021, Melvin Richard Springer IV 2022 University of Mississippi

Effective Green Marketing Strategies On Social Media: Selling Companies And Their Consumers On Investing In Carbon Offsetting And Solar Energy In 2021, Melvin Richard Springer Iv

Honors Theses

In a digital world where consumers and businesses alike care significantly about sustainability and corporate social responsibility (CSR), the success of startup companies hinges on constant, clear, and thoughtful communication. Through my research into successfully marketing such concerns on social media as well as my internship at Clearloop, I discovered some of the best ways to convince both companies and consumers that preserving the planet should be a primary concern for every environmentally conscious company. Companies that ignore their impacts on the environment are synonymous with companies doomed to fail in the 21st century. Clearloop’s model of partnering ...


Design Of A Bandgap Voltage Reference, Nicolaus Vail 2022 University of Arkansas, Fayetteville

Design Of A Bandgap Voltage Reference, Nicolaus Vail

Electrical Engineering Undergraduate Honors Theses

This thesis details the design process of a bandgap voltage reference (BGR) integrated circuit in a 180 nm CMOS process. A BGR provides a constant DC voltage across a range of operating temperatures and supply voltages. By its nature, the circuit is intended as a reference, not to provide current, so the output would be connected to a very high impedance, such as the gate of a transistor. At 27°C, this design provides a 955 mV reference voltage given a nominal VDD of 3 V. From 20°C to 175°C, the output voltage has a variance of 7 ...


Signal Analysis Of Photovoltaic Systems For Multilevel Cybersecurity, Wesley G. Schwartz 2022 University of Arkansas, Fayetteville

Signal Analysis Of Photovoltaic Systems For Multilevel Cybersecurity, Wesley G. Schwartz

Electrical Engineering Undergraduate Honors Theses

The cybersecurity of grid-connected power electronics is a rapidly developing field as more and more of these devices become a part of the Internet of Things. The objective of this thesis to analyze the current control signals of a photovoltaic (PV) inverter and develop an interface board for the implementation of a new cyber-secure controller.

In this thesis, the testing and in-depth analysis of the current PV inverter control system will be conducted. Using the data collected, an interface board will be developed to allow the use of the Unified Control Board (UCB), developed by Chris Farnell, in the PV ...


The Role Of Consumers In The Adoption Of Alternatively Fueled Vehicles And Mitigation Of Vulnerabilities Associated With Electric Vehicle Charging, Elaina D. Stuckey 2022 Clemson University

The Role Of Consumers In The Adoption Of Alternatively Fueled Vehicles And Mitigation Of Vulnerabilities Associated With Electric Vehicle Charging, Elaina D. Stuckey

All Theses

Electric vehicles have the potential to replace traditional automobiles as the primary form of transportation. Despite major improvements in technology and an expanding focus on climate change making electric vehicles more practical than ever before, consumers are still wary of adopting them for legitimate reasons such as costs and charging infrastructure. Therefore, a concerted effort must be made to persuade individuals and companies to adopt this beneficial technology to reduce the carbon footprint and catalyze the construction of important charging infrastructure.

Though there are a multitude of benefits to adopting electric vehicles, there will be some negative effects on the ...


Battery Energy Storage System Mitigation Strategies For The Grid Impacts Of Electric Vehicle Charging Infrastructure, Chance Stowe 2022 Clemson University

Battery Energy Storage System Mitigation Strategies For The Grid Impacts Of Electric Vehicle Charging Infrastructure, Chance Stowe

All Theses

The face of transportation is changing as a greater number of companies and private individuals switch from traditional automobiles to electric vehicles. This surge has been bolstered by improvements in technology, increased marketing, and a heightened focus on the role humanity plays in climate change. This advancement brings a growth in electrical demand caused by the charging loads of these vehicles. Due to the quick, sudden rise of this technology, the utility energy industry is still in the early stages of preparing for electric vehicle loads beyond the traditional load growth.

Though the technology for battery energy storage has been ...


Addressing The Performance Of Distance Relays In Presence Of Inverter Based Resources, Prabin Adhikari 2022 Clemson University

Addressing The Performance Of Distance Relays In Presence Of Inverter Based Resources, Prabin Adhikari

All Theses

The transition towards clean energy initiatives to reduce global greenhouse emissions and the dependence on fossil fuels requires the interconnection of large-scale renewable energy power plants to high voltage transmission networks via inverters. These inverter interfaced power sources, popularly known as inverter-based resources (IBRs), pose several technical challenges to the existing distance protection infrastructures widely deployed in transmission systems.

Fault characteristics of IBRs are significantly different from those shown by synchronous generators (SGs). With IBRs taking a large share of generation, their increasing penetration at the transmission level causes incorrect operation of existing distance protection schemes designed for systems dominated ...


Environmental Design And Optimization Of Modular Hydropower Plants, Colin Sasthav 2022 University of Tennessee, Knoxville

Environmental Design And Optimization Of Modular Hydropower Plants, Colin Sasthav

Doctoral Dissertations

This research aimed to understand the pathways to cost-effective and sustainable low-head hydropower. Designing viable hydropower projects requires optimization across many economic, environmental, and social outcomes. However, existing run-of-river hydropower design models often focus on economic performance and customizing technologies for high-head diversion schemes. Standard modular hydropower is a new design approach that uses standardized rather than custom-designed technologies to achieve economies of scale. Oak Ridge National Laboratory established a conceptual outline for module classes based on functions, such as generation modules and fish passage modules, but further research was needed to identify how modules should be selected and operated ...


Power System Simulation Using A Differential Transformation Method, Yang Liu 2022 University of Tennessee, Knoxville

Power System Simulation Using A Differential Transformation Method, Yang Liu

Doctoral Dissertations

This work proposes a novel approach for efficient and robust power system simulation based on differential transformation (DT).

First, this work introduces the DT to study power systems as high-dimensional nonlinear dynamical systems for the first time. This work designs a DT-based high-order semi-analytical simulation scheme that allows significantly prolonged time steps to reduce simulation time compared to a traditional numerical approach. The numerical stability, accuracy, and time performance of the proposed approach are compared with widely used numerical methods on the IEEE 39-bus system and Polish 2383-bus system.

Second, this work proposes a novel non-iterative method to solve power ...


Data Center Power System Emulation And Gan-Based High-Efficiency Rectifier With Reactive Power Regulation, Jingjing Sun 2022 University of Tennessee, Knoxville

Data Center Power System Emulation And Gan-Based High-Efficiency Rectifier With Reactive Power Regulation, Jingjing Sun

Doctoral Dissertations

Data centers are indispensable for today's computing and networking society, which has a considerable power consumption and significant impact on power system. Meanwhile, the average energy usage efficiency of data centers is still not high, leading to significant power loss and system cost.

In this dissertation, effective methods are proposed to investigate the data center load characteristics, improve data center power usage efficiency, and reduce the system cost.

First, a dynamic power model of a typical data center ac power system is proposed, which is complete and able to predict the data center's dynamic performance. Also, a converter-based ...


Improving The Biocompatibility Of The Bio-Inorganic Interface For Enhanced Photosystem I-Based Biophotovoltaic Device Performance, Alexandra H. Teodor 2022 University of Tennessee, Knoxville

Improving The Biocompatibility Of The Bio-Inorganic Interface For Enhanced Photosystem I-Based Biophotovoltaic Device Performance, Alexandra H. Teodor

Doctoral Dissertations

The world’s energy demands are projected to increase by nearly 50% by the year 2040, and consumption of carbon-based fuels continues to release greenhouse gases such as carbon dioxide and methane into the atmosphere. This has been causally linked with climate change and increased extreme weather events, which has been further linked to adverse health outcomes and negative effects on biodiversity, food security, and increased disease transmission. Clearly, there is a need for a sustainable, carbon-free, and cost-effective method of energy production to meet growing energy production demands. The sun irradiates Earth’s surface annually with ~80,000 terawatts ...


Digital Commons powered by bepress