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Title: Coordination of distributed battery energy storage systems in networks with high penetration of photovoltaics
Author: Unigwe, Obinna Chikwado
ISNI:       0000 0004 8509 4607
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2020
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The use of battery energy storage system (BESS) in the electricity grid is growing in popularity as a major player in facilitating the integration to greater levels of renewable energy sources (RES) into the electricity network. Photovoltaic (PV) in particular, has seen the highest increase in deployed capacity in recent years as a result of falling costs. However, high levels of penetration of PV into the network, can lead to technical challenges such as harmonics, flickers, reverse power and overvoltage. Among these challenges, overvoltage constitutes the major limitation to the increase in RES penetration. Overvoltage can be managed through adequate utilisation of BESS on the network, but BESS are still expensive. Because the health and lifespan of a BESS is dependent on the way it is cycled during its operating life, it is important that BESS is operated in a way that promotes its longevity. This thesis proposes strategies for the coordination of operations of multiple BESS in networks with high penetration of PV. It presents techniques for mitigating resultant overvoltage situations, while operating the BESS in ways that maximise their lifespans. Control strategies used are based on the use of voltage sensitivities of the network buses for the estimation of charge and discharge powers of the participating BESS at different times. The flat structure sensitivity scheme (FSSS) is the basic coordination scheme that considers the entire network in a flat non-heirarchical structure. The neighbourhood schemes include the uniform neighbourhod participation scheme (UNPS) and the rotational neighbourhood participation scheme (RNPS). These neighbourhood schemes involve the segmentation of the network into neighbourhoods to promote more effective participation of the BESSs. In this thesis, implementation of the schemes on different networks was carried out and simulation results also presented. The results demonstrate that with the proposed strategies, BESS can be effectively used to achieve higher levels of penetration of PV in the power networks, while maximising the BESS lifetime.
Supervisor: Kiprakis, Aristides ; Shek, Jonathan ; Harrison, Gareth Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
Keywords: battery energy storage systems ; photovoltaic ; overvoltage ; electricity grid ; flat structure sensitivity scheme ; BESS ; uniform neighbourhod participation scheme ; UNPS ; rotational neighbourhood participation scheme ; RNPS ; FSSS