MPPT - Maximum Power Point Tracking

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MPPT - Maximum Power Point Tracking

http://bama.ua.edu/~bwbuckley/projects/mppt.html

PROJECTS

PICTURES

RESUME

ABOUT

mppt: a maximum power point tracking photovoltaic system.INTRODUCTIONO MAXIMIZE A PHOTOVOLTAIC (PV) SYSTEM'S OUTPUT POWER, CONTINUOUSLY TRACKING THE MAXIMUM POWER point (MPP) of the system is necessary. The MPP depends on irradiance condi&ons, the panel's temperature, and the load connected. Maximum power point tracking (MPPT) algorithms provide the theore cal means to achieve the MPP of solar panels; these algorithms can be realized in many dierent forms of hardware and so#ware. PV systems that lack MPPT rarely operate at the most ecient, MPP. This is why the rated power of the solar panel is almost never realized when connec ng a load. The goal of this project was to rapidly develop, construct, and test a working solu on to the MPP problem with a limited budget.

CONTENTS INTRODUCTION HARDWARE COMPONENTS SOLAR PANEL DIGITAL CONTROLLER DC-DC CONVERTER SENSING CIRCUITS DIGITAL-TO-ANALOG CONVERTER SOFTWARE AND ALGORITHMS MPPT ALGORITHMS EMBEDDED SOFTWARE FUTURE WORK PROJECT COST FUTURE WORK CONCLUSION

This project was developed from the ground up with only a few references. Dr. Jaber AbuQahouq was the team's advisor and provided invaluable guidance throughout the project's life me. The team consisted of ve undergraduate students: Travis Grant, Stephen Tirador, Nathan Wilbanks, Ma3 York, and myself. Rapid development necessitated that the team rst look through exis ng analysis and possible solu ons to the MPP problem. It became clear that the perturb and observe (P&O) technique was widely used for its ease of implementa on. It is based on the following criterion: if the opera ng voltage of the PV array is perturbed in a given direc on and if the power drawn from the PV array increases, this means that the opera ng point has moved toward the MPP and, therefore, the opera ng voltage must be further perturbed in the same

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MPPT - Maximum Power Point Tracking

http://bama.ua.edu/~bwbuckley/projects/mppt.html

direc on. Otherwise, if the power drawn from the PV array decreases, the opera ng point has moved away from the MPP and, therefore, the direc on of the opera ng voltage perturba on must be reversed. The team chose to implement the P&O algorithm in so#ware to add exibility to the system as well as simplify the system to the point where the system could be rapidly constructed and tes ng commenced. The following components were needed to design a minimal working solu on: solar panel, current sensor, voltage sensor, DCDC converter, digital controller, and the glue logic/circuitry to connect everything together.

SOLAR PANEL

HE SOLAR PANEL USED IN OUR SYSTEM IS AN OEM40 MODEL MANUFACTURED BY SUNWIZE TECHNOLOGIES, INC

and was provided by the Department of Electrical and Computer Engineering's Dr. Tim Haskew. It has a power ra ng of 40 W, an opencircuit voltage (Voc) of 21 Vdc, and a shortcircuit current (Isc) of 2.68 A.

DIGITAL CONTROLLER

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MPPT - Maximum Power Point Tracking

http://bama.ua.edu/~bwbuckley/projects/mppt.html

HE MICROCONTROLLER PROVIDES THE CONTROL IN OUR SYSTEM. THE CHOICE OF MICROCONTROLLER FOR THE

system dictates much of the cost, performance, and exibility of the en re system. Taking into considera on the project's constraints, the Texas Instruments TMS320F28335 model digital signal controller (DSC) was chosen. The singlechip C2000 family of microcontrollers is targeted toward real me control applica ons thanks to powerful, high performance integrated peripherals. The core is "mathop mized" and gives designers the means to improve system eciency, reliability, and exibility when the applica on requires complex algorithms. It features:32BIT FLOATING POINT CPU (

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