Simple control strategy for a PV-battery system

Abstract

Nowadays, energy storage systems, such as batteries, are spreading in many applications. Among the kinds of batteries, the lithium-ion technology is one of the most promising solutions. Considering the photovoltaic (PV) plants, it is very important to perform a correct sizing of the battery pack to both maximise the self-consumption and minimise the total costs. In general, PV plants need a dc–dc converter to maximise the electric power that can be extracted from PV panels and a dc–ac converter to connect them to the ac grid. The battery pack can be connected in three different ways: dc coupled and ac coupled using a dedicated converter or through a direct connection on the dc-link between the dc–dc and dc–ac converters. In the present study, the last solution, without any dedicated converters, is used and a simple control strategy to both maximise the power extracted from the PV panel and regulate the charging/discharging of the battery is proposed.

Keywords

• photovoltaic power systems
• dc-ac power convertors
• energy storage
• power grids
• secondary cells
• dc-dc power convertors
• dc–dc converter
• pv panel
• dc–ac converter
• ac grid
• battery pack
• dc coupled ac
• dedicated converter
• direct connection
• dc-link
• simple control strategy
• pv-battery system
• energy storage systems
• lithium-ion technology
• promising solutions
• photovoltaic plants
• correct sizing
• maximise
• pv plants