Abstract:
Energy storage systems are frequently used to buffer the difference between
intermittent renewable generations and energy demand in microgrids. Different
energy storage options are possible but the battery energy storage is in high demand in
due to its advantages such as relatively fast response, less environmental impact, and
diversity of technology and ability of recycling, over the alternative options such as
ultra-capacitors, pump storage and flywheels. But the operation of a Battery Energy
Storage System (BESS) is affected by dynamics of charging/discharging current,
internal temperature build up, extreme reaches of SOC level etc. Therefore a battery
model that can represent dynamic and static load changes, thermal response and SOC
is important to monitor and control the BESS for a longer life time, enhancing
sustainability and reliability of the microgrid.
This thesis describes the development of a comprehensive electro-thermal model for
li-ion batteries that can be used to investigate dynamic and static performances of a
microgrid under real time operating conditions. The battery-model has the ability to
self-update its parameters with the variation of core-temperature, and also to
accommodate inherent hysteresis present on parameters between charging and
discharging events. The developed model is presented as a block in
MATLAB/Simulink for easier use by others. In parallel with that, the details of the
development of a complete simulation platform of a microgrid is also described, which
includes battery charging and discharging converter systems, bi-directional grid-end
AC/DC converter system, wind energy input, solar PV energy input, load and closed
loop control associated with converter systems. The battery model is simulated within
the microgrid platform with a chosen energy management criteria. The results of the
simulation are also presented and discussed.
Citation:
Attanayaka, A.M.S.M.H.S. (2019). Development of a comprehensive electro-thermal battery model for energy management in microgrid systems [Master’s theses, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.mrt.ac.lk/handle/123/16171