Effective control and battery charging system of an island PV power plant
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Kuupäev
2019
Kättesaadav alates
Autorid
Papez, V.
Papezova, S.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
The 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.
Kirjeldus
Article
Märksõnad
LiFePO4 battery, autonomous PV power plant regulatory system, MPP tracking, articles