Optimal shade distribution technique to mitigate partial shading effects in photovoltaic systems
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Aliaslkhiabani, Mahdieh
issued: 2018-12-18T16:56:07Z
issued: 2018
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Partial Shading (PS) critically reduces the maximum power extractable from a photovoltaic (PV) array, decreasing its efficiency, and creating multiple local peaks (LP) in the characteristic P-V curve of the array. Currently, the electrical connection that minimizes the power loss is the Total Cross Tied (TCT) connection, where each panel in a string is connected in parallel to the all the other panels in the same row, creating an electrical matrix connection. Although the TCT connection reduces part of the problem, it is still sensitive to several shaded panels in the same row constraining the current. In this thesis, a new technique to reduce the consequences of mismatch conditions by optimally distributing the shade over the entire array while maintaining the TCT connection is presented. The proposed method is dubbed “Shade Dispenser” (SD), as it takes a physical shade covering adjacent cells and electrically dispenses it minimizing the occurrence of same-row shades. The physical separation of electrically connected PV panels comes at a cost: it increases the wiring cost and power losses of the array. This trade-off is explored in the proposed paper, outlining the solution for each array size. As a result, this technique represents a considerable reduction in the effects of PS while minimizing wiring losses and costs. The performance of the system is investigated under different shading patterns and compared with the most efficient existing interconnection schemes. Simulation results confirm that not only is the efficiency of the proposed strategy higher, but the payback time for overhead wiring cost is lower. Moreover, this method diminishes the number of Local Peaks (LP) in the P-V curve of the array.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/68079
note: Optimal Shade Distribution Technique to Mitigate Partial Shading Effects in Photovoltaic Systems by Mahdieh Aliaslkhiabani B.Sc., Central Tehran Branch University, 2014 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in The College of Graduate Studies (Electrical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) December 2018 ©Mahdieh Aliaslkhiabani, 2018 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: Optimal Shade Distribution Technique to Mitigate Partial Shading Effects in Photovoltaic Systems Submitted by Mahdieh Aliaslkhiabani in partial fulfillment of the requirements of the degree of Master of Applied Science . Dr. Liwei Wang, Faculty of Applied Science, UBC Okanagan Supervisor, Professor Dr. Martin Ordonez, Faculty of Electrical and Computer Engineering, UBC Vancouver Co-Supervisor, Professor Dr. Wilson Eberle, Faculty of Applied Science, UBC Okanagan Supervisory Committee Member, Professor Dr. Morad Abdelaziz, Faculty of Applied Science, UBC Okanagan Supervisory Committee Member, Professor Dr. Jian Liu, Faculty of Applied Science, UBC Okanagan University Examiner, Professor iii Abstract Partial Shading (PS) critically reduces the maximum power extractable from a photovoltaic (PV) array, decreasing its efficiency, and creating multiple local peaks (LP) in the characteristic P-V curve of the array. Currently, the electrical connection that minimizes the power loss is the Total Cross Tied (TCT) connection, where each panel in a string is connected in parallel to the all the other panels in the same row, creating an electrical matrix connection. Although the TCT connection reduces part of the problem, it is still sensitive to several shaded panels in the same row constraining the current. In this thesis, a new technique to reduce the consequences of mismatch conditions by optimally distrib…
has type: Thesis/Dissertation
date issued: 2019-02
is shown at: 10.14288/1.0375766
language: eng
degree discipline: Electrical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/68079