Title:	Transient Response and Non-Linear Capacity Variation Aware Unified Equivalent Circuit Battery Model
Author(s):	D. Zhao, I. Taniguchi, F. Catthoor, T. Onoye
Keywords:	Battery Storage and Control, Hybrid, Batteries, Modelling
Topic:	Energy Transition – Integration, Storage, Sustainability, Policy, Economics, Energy Poverty, Society
Subtopic:	Energy System Integration; Storage
Event:	8th World Conference on Photovoltaic Energy Conversion
Session:	5DV.2.4
Pages:	1579 - 1584
ISBN:	3-936338-86-8
Paper DOI:	10.4229/WCPEC-82022-5DV.2.4
Price:	0,00 EUR
Document(s):	paper, poster

Abstract/Summary:

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Battery energy storage plays a vital role in the renewable energy system. Battery as the only dynamic element in a PV system, the current, voltage, resistivity, etc. are varying during charging and discharging. With an accurate and efficient battery model, the designer can predict and optimize battery runtime and performance during different working scenarios. However, low-complexity state-of-the-art models are too weak on the transient behavior. The primary purpose of this study is to provide an efficient dynamic battery model for the simulation of stand-alone PV applications. In this study, an enhanced and comprehensive electrical battery model has been proposed and implemented in the SPICE environment. The proposed model accounts for battery non-linear open-circuit voltage and non-linear capacity effect, which are essential for renewable energy storage applications. The proposed model consists of kinetic based runtime estimation model and transient response model. The proposed model was validated with experimental data on Li-ion batteries. The results show that the proposed model can accurately predict the battery runtime and I–V performance with acceptable execution time overhead. Moreover, the proposed model can also be easily extended to other batteries.