Abstract
Hybrid systems, which are composed of combinations of diesel generators, battery energy storage system and renewable energy resources such as photovoltaic, are outlined as a recommended approach for off grid power supply options for remote areas applications. Since these systems are not connected to an infinite source of energy, they must be well designed and controlled to satisfy the demand load. This study presents an efficient battery management strategy for the charging and discharging of the batteries in a hybrid renewable energy systems by controlling the energy flow between different components of the system. In order to simulate the developed battery management strategy, the components of the hybrid system are studied and modeled using mathematical models. During modeling of the battery storage system, the effects of aging and capacity degradation were taken into consideration. The simulation of the strategy was based on a case study, where it is validated to be functional. Finally, the optimization of the strategy has been done by working on its critical parameters.
Highlights
Public interconnected power grids are composed of complex combinations of generation plants, substations, transformers and transmission lines, which supply electricity to cities, businesses and industry
Hybrid plants can be an integration of diesel generators with renewable energy resources such as photovoltaic
As part of our objective of designing such a battery management strategy (BMS), we will in this study focus on extending batteries’ life with respect to the whole investment life which has significant impact on the battery cost
Summary
Public interconnected power grids are composed of complex combinations of generation plants, substations, transformers and transmission lines, which supply electricity to cities, businesses and industry. Hybrid plants can be an integration of diesel generators with renewable energy resources such as photovoltaic. A solution is to add a storage element to these nonconventional and intermittent power sources [4,5] In this case, the hybrid system is composed of a PV generator, local loads, electricity storage, and the conventional source (diesel genset) [5]. Integrating a battery energy storage system with the hybrid plant provides significant dynamic operation benefits such as higher stability and reliability of power supply. A continuous exposure to high discharge current leads to fast capacity degradation shortens the battery’s life, which is unavoidable due to sudden changes in the power requirement, such as motor start-up. To extend the battery life, researchers focused on management strategies that use more than one charging/discharging modes. We will take a case study and size the hybrid system, so we can take it as a reference to simulate our strategy
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