Abstract
Off-grid power systems based on photovoltaic and battery energy storage systems are becoming a solution of great interest for rural electrification. The storage system is one of the most crucial components since inappropriate design can affect reliability and final costs. Therefore, it is necessary to adopt reliable models able to realistically reproduce the working condition of the application. In this paper, different models of lithium-ion battery are considered in the design process of a microgrid. Two modeling approaches (analytical and electrical) are developed based on experimental measurements. The derived models have been integrated in a methodology for the robust design of off-grid electric power systems which has been implemented in a MATLAB-based computational tool named Poli.NRG (POLItecnico di Milano—Network Robust desiGn). The procedure has been applied to a real-life case study to compare the different battery energy storage system models and to show how they impact on the microgrid design.
Highlights
Rural electrification represents one of the issues to be faced in order to provide energy services to 1.2 billion people living in Developing Countries (DCs) that do not have access to electricity [1].Off-grid systems have an important role in this issue, and especially electrical power systems based on photovoltaic (PV) and battery energy storage systems (BESS)
The focus is on the microgrid robust design as proposed in the presented procedure, results will show how different BESS models lead to different optimal plant configuration
State of Health (SoH) indicators—have been determined as pivotal features to correctly evaluate the robust design of off-grid systems
Summary
Rural electrification represents one of the issues to be faced in order to provide energy services to 1.2 billion people living in Developing Countries (DCs) that do not have access to electricity [1]. Off-grid systems have an important role in this issue, and especially electrical power systems based on photovoltaic (PV) and battery energy storage systems (BESS). Results of the study case are presented, where a detailed comparison of the different battery models evaluated aims at understanding their impact on the power system design
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