Power and Energy Commons^™

Energy Harvesting From Exercise Machines: Bike Buck-Boost Converter, Monroe Diamond, Brian Vuong

Electrical Engineering

This project is a continuation of previous senior projects’ work on Energy Harvesting from Exercise Machines (EHFEM). EHFEM seeks an alternative DC to DC converter to function within the existing exercise bike system. Implementing this new DC to DC converter aims to avoid previous complications other groups encountered, such as only running at low load currents, exceeding an input threshold voltage to begin operation, and performing at low efficiency. In developing this self‐generating exercise bike, Cal Poly wishes to incorporate an array of energy‐harvesting exercise machines in its Recreation Center expansion scheduled for completion in 2012.

An Expandable Micromotor Dc Drive System, Michael Ruelan, Justin Gragg

Electrical Engineering

This report documents the design phases and fabrication of an expandable micro-motor DC drive system. This project illustrates that a flexible range of output power demands can be met from a small DC micro-motor drive unit with the use of power electronics.

In this project miniature DC micromotor drives, each capable of drawing up to 5.5 amps rated current (5 amps due to the utilization of a 5 amp fuse), were designed as card inserts that can be conveniently inserted in parallel in to a cardholder within the console. The “insert” feature allowed our console to successfully draw up to …

Magnetic Design Web Application, Michael Brim

Electrical Engineering

The automated Magnetic Design Web Application, available at http://www.magneticdesign.org, generates the full design process of a power transformer, gapped inductor and toroidal inductor given design specifications provided by the user. Calculations are accomplished using Area Product, Ap, or Core Geometry, Kg, procedures. All design processes mirror the format used in Dr. Taufik’s Introduction to Magnetic Design lecture-notes. An administrative backend is provided where instructors can add or modify core design values to expand the array of materials used. The project aims to aid student understanding of magnetic design and course concepts while allowing instructors to broaden the scope of material …

Simulation Of Cal Poly Super System Simulink Model Using Insolation Variation, Jacob Kory

Electrical Engineering

This senior project focuses on simulation of the Cal Poly SuPER system using an insolation model. First, local and historical weather data is examined to determine the range of limits that the model will utilize. Then, the insolation model is constructed to fit into the existing SuPER model. The overall system is tested under a variety of insolation values to determine system performance of motor and static loads. Based on these simulations, several factors of the current model are discovered that limit the power consumption profile under off-peak load conditions. Finally, recommendations on improvements to the model are discussed

Transmission System Construction And Analysis, Siyuan Wang

Electrical Engineering

In this project we designed and analyzed a simple power system from scratch using Positive Sequence Load Flow (PSLF) and Computer Aided Protection Engineering (CAPE). PSLF is used to solve the balance transmission system. The simulation results from PSLF prove the proposed methodology numerical accuracy. Short circuit duty is simulated using CAPE to find the fault current each bus can have on the system, so engineers can protect the system with the appropriate protection scheme. This project totals two major loads with a combine MW intake of 450 MW. In order to supply multiple loads with constant power, the system …

Solar Panel Experiment, John Hauger

Electrical Engineering

This senior project will focus on creating a suitable testing procedure for the provided solar panel system. The testing parameters will be based on the expected 60W output power of the system. The complete procedure will provide a thorough analysis of the power flow and overall efficiency of the system.

This senior project report will discuss the importance of this experiment in the Electrical Engineering curriculum, the system requirements and parameters tested in the design, and the provided results based on the test conditions. In addition, this report will include the complete testing procedure and recommendations for possible future additions …

Energy Harvesting From Elliptical Machines: Dc Converter Troubleshooting, Michelle Lum, Jonathan Yuen

Electrical Engineering

In continuing the global effort to integrate innovative technology and renewable energy in the world’s power system, Cal Poly endeavors to harvest energy from elliptical machines and feed that power back into the electrical grid. This continuation of the previous project, Energy Harvesting from Exercise Machines Self‐generating Elliptical Machines, seeks an alternative DC to DC converter to function within the existing elliptical self‐generating system. By attempting to implement this new DC to DC converter, the project strives to reduce the size of the converter in order to mount it on the elliptical machine. The project also tries to explain how …

Switching Circuit For A Permanent Magnet Dc Motor, Alex Boatman

Electrical Engineering

The project is a circuit that will basically supply current from the battery to the different stator coils at opportune moments. With a hall-effect sensor on the shaft as a feedback to a microcontroller, I was able to toggle switches based on the position of the shaft at the moments where we would be using as little power as possible. The operation of the control circuit works similar to a stepper motor; it takes a signal from the microcontroller that is sent to some FET drivers, which in turn sends signals to the FETs to open or close as the …

Lab-Scale Thyristor Rectifier And Static Var Compensator Circuits, Haroun Idris, Ibrahim Idris

Electrical Engineering

The purpose of this project is to design thyristor circuits by using single-phase FCRO 4100 firing board donated by ENERPRO. These circuits in conjunction with a thyristor module will be used for future lab experiments in power electronics courses.

The first part of this project is to study the full effect of a firing angle on a controlled single phase full bridge thyristor rectifier circuit. Furthermore, the resulting circuit setup will be implemented as part of future lab experiments in Power Electronics I course. The next purpose of this project is to design a small-scale Static VAR Compensator (SVC) lab …

Dc-Dc Converter For Harvesting Energy From An Exercise Bike, Henry Ureh, Chris Henry

Electrical Engineering

Create an efficient buck-boost converter that adapts to input voltage range from ~3.8V to 70V, and outputs 13.7V DC, the voltage required by a charge controller to charge a battery. The energy stored in the battery will be supplied back to the grid.

The cost of energy saved by the converter should eventually cover the initial price of the converter. The converter should help reduce the net power consumption of the exercise machines used in the Cal Poly gym

Overcurrent Coordination Study, Edwin Pho

Electrical Engineering

No abstract provided.

1.5 Kw Pwm Bipolar Inverter, Michael Newbry, Percy Vigo

Electrical Engineering

This report focuses on the design, construction, and testing of a PWM inverter capable of converting 1.5 kW. The purpose for the inverter is to convert DC solar energy to power an air conditioner. The inverter uses a bipolar control scheme which comes from a PIC microcontroller. This report contains the advantages and disadvantages of all the PWM control schemes. Furthermore, the testing shows bipolar inverter characteristics and a sample use of filters to obtain sinusoidal waveforms. The design of the circuit makes the inverter easy and safe to use and test.