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Effective control and battery charging system of an island PV power plant

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dc.contributor.authorPapez, V.
dc.contributor.authorPapezova, S.
dc.date.accessioned2019-05-08T11:25:34Z
dc.date.available2019-05-08T11:25:34Z
dc.date.issued2019
dc.descriptionArticleeng
dc.description.abstractThe paper presents a new concept of an autonomous PV power plant regulatory system with LiFePO4 batteries, which was functionally verified. The hardware system is significantly simpler and more operationally reliable. It also shows higher efficiency and lower acquisition costs than conventional commercial systems. The proposed control system was optimized for charging a multi-cell battery by PV electric energy. The system automatically maximizes the power supplied by the photovoltaic source and minimizes the power loss caused by balancing the individual cell charging processes. The problem of charge balancing is solved without the balancers. Battery cells are recharged from the separate converters supplying the PV power. The converters are controlled to observe a LiFePO4 battery charging mode while controlling the photovoltaic generator (PVG) load resistance based on an MPP monitoring. PVG power is not supplied to the charged cells, which are in this way protected from overcharging. The entire PVG power is fed to the cells to be charged. The transmission from the converters is controlled in order not to exceed the voltage and current limits at the terminals and to minimize the actual voltage deviation from the control voltage at the PVG output. The control voltage is generated as an MPP voltage approximation according to the load character-istics and the actual PVG operating conditions.eng
dc.identifier.issn1406-894X
dc.identifier.publicationAgronomy Research, 2019, vol. 17, Special Issue 1, pp. 1181–1190eng
dc.identifier.urihttp://hdl.handle.net/10492/4729
dc.identifier.urihttps://doi.org/10.15159/ar.19.122
dc.rights.holderCopyright 2009 by Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry. No part of this publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, incl. photocopying, electronic recording, or otherwise without the prior written permission from the Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry.eng
dc.subjectLiFePO4 batteryeng
dc.subjectautonomous PV power plant regulatory systemeng
dc.subjectMPP trackingeng
dc.subjectarticleseng
dc.titleEffective control and battery charging system of an island PV power planteng
dc.typeArticleeng

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2019, Vol. 17, Special Issue 1