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|Title: ||Reliability Assessment of Battery-Assisted and ElectrolyserBattery Integrated PV Systems for Off-Grid Applications|
|Authors: ||Effah, Francis Boafo|
Fault Tree Analysis
Functional Block Diagram
|Issue Date: ||Mar-2018|
|Publisher: ||Ghana Journal of Technology|
|Citation: ||Annan, J.K., Effah, F.B. and Quaicoe, J.E., 2018. Reliability Assessment of Battery-Assisted and Electrolyser-Battery Integrated PV Systems for Off-Grid Applications. Ghana Journal of Technology, 2(2), pp.14-23.|
|Abstract: ||Solar Photovoltaic (PV) systems are usually the most obvious choice of renewable electrical energy installations for
electrical energy supply. PV systems are generally categorised as grid-connected or standalone systems. In many
applications, the most common type of storage used in solar PV systems is chemical storage, in the form of battery units.
This paper considers the use of an electrolyser as an alternative storage system to convert excess PV electrical output into
hydrogen gas for later utilisation by Proton Exchange Membrane Fuel Cell (PEMFC). In this paper, PV system involving
battery storage units are assessed along with PV system having electrolyser-battery integration in terms of their reliabilities.
The assessment involves review of the schematics of the proposed PV configurations, the determination of component
failure rates and the reliability modelling of the system. Reconfiguring the system into power delivery mode with power
delivery routes and storage mode with storage routes, the reliabilities of the systems were obtained. Applying probabilistic
approach, the reliability for the combined power delivery route was given as 0.853013 whereas the direct PV supply route,
the battery supply route and the fuel cell supply route gave reliabilities of 0.802564, 0.81723 and 0.827821, respectively, for
one year of the system life. The combined system reliability of the storage mode gave a value of 0.997483 whereas the
battery storage route and the electrolyser storage route gave reliability estimates of 0.948448 and 0.930736, respectively.
Further system analysis showed that the electrolyser-battery integrated system is more reliable but had some setbacks which
included the fact that the battery had to charge after which the electrolyser could work. Again, the PV output should be
greater than the load demand to enable the electrolyser work effectively. The electrolyser-battery integrated system is more
applicable for large PV output system feeding varying loads at different periods|
|Appears in Collections:||College of Engineering|
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