Maximum power point tracking (MPPT) control of pressure retarded osmosis (PRO) salinity power plant: Development and comparison of different techniques

Abstract

. (2016) Maximum power point tracking (MPPT) control of pressure retarded osmosis (PRO) salinity power plant : development and comparison of different techniques. Desalination,. Permanent WRAP URL:http://wrap.warwick.ac.uk/78938 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for-profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. Abstract:This paper presents two new methods for the maximum power point tracking (MPPT) control of a pressure retarded osmosis (PRO) salinity power plant, including mass feedback control (MFC) and fuzzy logic control (FLC). First, a brief overview of perturb & observe (P&O) and incremental mass resistance (IMR) control is given as those two methods have already demonstrated their merit in good control performance. Then, two new methods employing variable-step strategy, MFC and FLC, are proposed to address the trade-off relationship between rise-time and oscillation of P&O and IMR. Genetic Algorithm (GA) is used for finding the optimum parameters of membership functions of FLC. From the case-study of start-up of the PRO adopting MPPT control, MFC and FLC have shown faster convergence to the target performance without oscillation compared with P&O and IMR. These four MPPT techniques are further evaluated in case-studies of state transitions of the PRO due to operational fluctuations. It is proven that the MPPT using FLC and modified MFC has better performance than the other two methods. Finally, the paper reports a comparison of major characteristics of the four MPPT methods, which could be considered as guidance for selecting a MPPT technique for the PRO in practice. IntroductionPressure retarded osmosis (PRO) is a promising method which is potentially capable of producing power and processing water simultaneously because of its nature of combination of the water treatment and renewable energy generation. In other words, it can be used as not only a clean energy generator, but also a water treatment to recycle water. In a PRO plant, chemical potential between the two salinities is converted to hyd...

A Boosted Particle Swarm Method for Energy Efficiency Optimization of PRO Systems

“…Figure 3 depicts the temperature profile in the PRO system in scenario 1, which mimics a classic temperature change during a day. The detailed parameters of the membrane parameters in a PRO system under different operational temperatures are previously investigated and studied in [16,17].…”

“…Figure 3 depicts the temperature profile in the PRO system in scenario 1, which mimics a classic temperature change during a day. The detailed parameters of the membrane parameters in a PRO system under different operational temperatures are previously investigated and studied in [16,17]. In the PRO system, the temperature gradient on the heterogeneous membrane causes heat transfer inside the membrane and along the membrane surface [14].…”

“…Parameters of solution properties, fluid mechanics and membrane properties. The studied draw solution is 35 g/kg (about 0.6 M) NaCl solution [16,19]. Based on the above parameters, the optimal power density values of all algorithms under temperatures fluctuations are shown in Table 4.…”

Factors Affecting the Performance of Membrane Osmotic Processes for Bioenergy Development

“…An increase in both flow rates causes a Nonetheless, it is a challenge to define a general set of best-operating parameters since they are highly dependent on a particular system where each system has its own membrane parameters, equipment specifications, element geometry, site conditions, and system losses [99]. Maximum power point tracking (MPPT) has been proposed recently to have real-time control of PRO systems by either controlling of only one parameter which is the pressure exerted [100][101][102] or simultaneously controlling of few parameters including feed flow rates, draw flow rates and pressure exerted [103]. Maximum net power and maximum specific energy can then be extracted from the PRO system at both the design stage and in the field with varying conditions [103].…”

An Improved Bat Algorithm for More Efficient and Faster Maximum Power Point Tracking for a Photovoltaic System Under Partial Shading Conditions

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