He, Wei, Wang, Yang and Shaheed, Mohammad Hasan (2015) Maximum power point tracking (MPPT) of a scale-up pressure retarded osmosis (PRO) osmotic power plant. Applied Energy, 158 . pp. 584-596. doi:10.1016/j.apenergy.2015.08.059 ISSN 0306-2619.

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Abstract

This paper presents a maximum power point tracking (MPPT) of a scale-up pressure retarded osmosis (PRO) based osmotic power generator. Inspired by the well-known MPPT in photovoltaic (PV) array, two algorithms, perturb & observe (P&O) and incremental mass-resistance (IMR) method, are investigated. Using a series of simulations, both the algorithms are demonstrated to be capable of tracking the maximum power point (MPP) and capturing the transitions between varied MPPs due to the fluctuations of operating temperature. However, in both cases the trade-off between the rise time and the oscillation is found requiring further consideration on the selection of the step-size for perturbation pressure or incremental pressure. In order to improve the performance of the MPPT, furthermore, an optimum model-based controller (OMC) is used to estimate the initial optimum pressure for the MPPT in a scale-up PRO process. It is found that with OMC, the performance of the MPPT is improved significantly. Finally, a strategy to operate and coordinate the MPPT and OMC to deal with the rapid variations of the salinities are proposed and evaluated in terms of individual variation of the concentration or flow rate and co-variation of the both. The simulations demonstrate the preferred performance of the proposed strategy to adjust the operation subject to the rapid changes of the salinities.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Osmosis, Renewable energy sources, Power (Mechanics), Photovoltaic power systems, Power electronics
Journal or Publication Title:	Applied Energy
Publisher:	Elsevier BV
ISSN:	0306-2619
Official Date:	November 2015
Dates:	Date Event November 2015 Published
Volume:	158
Page Range:	pp. 584-596
DOI:	10.1016/j.apenergy.2015.08.059
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Date of first compliant deposit:	12 February 2020
Date of first compliant Open Access:	25 February 2020

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