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Simulation and Design of Strategies to Control the Energy Flow in a Multi-Function Power Converter

Stefan Schleeh
Göteborg : Chalmers tekniska högskola, 2013. 70 s.
[Examensarbete på avancerad nivå]

Abstract In this thesis work a simulation model of a PV-system with a connected BESS has been built and three strategies has been designed to control the energy flow between the different power units in order to increase the economical return with a BESS. The power units were the local load, the energy production from the PV-modules, the battery energy storage and the grid. In strategy 1 and strategy 2 the main purpose is to increase the usage of self produced energy. In strategy 2 the charge and discharge of the battery is also controlled to certain hours. In the night, when the energy price is at its lowest, the battery is charged and in the morning, when the energy price is at its highest, the battery is discharged. During the day the battery is charged from the overproduced energy from the PV-modules and in the afternoon, the stored energy in the battery is controlled to be used from the time when the energy price is highest. Strategy 3 was, instead of increasing the self usage of the own produced energy, designed to reduce the highest power peaks over the month. Under the given circumstances, it could be seen that by using strategy 2 and 3 the economical return compared to strategy 1 were increased. The highest increase was to use strategy 3. However, the strategies did not increase the economical return as much in order for the BESS to be economically beneficial except for the lead acid battery in strategy 3, which had almost the same economical return at different energy sizes of the battery.

Nyckelord: PV-system, BESS, Management, Energy flow, Converter, Strategy.

Publikationen registrerades 2013-12-27. Den ändrades senast 2015-04-16

CPL ID: 190504

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