access icon openaccess Decentralised control strategy for hybrid battery energy storage system with considering dynamical state-of-charge regulation

This is an open access article published by the IET under the Creative Commons Attribution -NonCommercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Received 27/02/2020, Accepted 07/09/2020, Revised 01/08/2020, Published 11/09/2020

Hybrid battery energy storage system (HBESS) consists of high power density battery and high energy density battery will have a bright future in special isolated DC microgrid conditions such as the all-electric ships and all-electric airplanes, which have strict limitation on storage capacity and size. In this study, a new decentralised control strategy based on mixed droop is proposed to HBESSs with considering the batteries. In decentralised control strategy, conventional V–I droop controller is utilised to high energy density battery to mainly supply the steady power, I–V droop controller is utilised to high power density battery to respond to power change and supply a few steady power. In addition, dynamical state-of-charge (SoC) regulation algorithm is utilised to reassign the battery power according to their own SoC. The power coordination of the high energy density batteries and high discharge rate batteries is achieved by adjusting the values virtual impedance and reference input voltage. Case study shows that the proposed control strategy is flexible and efficient.

Inspec keywords: secondary cells; voltage regulators; decentralised control; battery storage plants

Other keywords: battery power; all-electric airplanes; high power density battery; reference input voltage; high energy density battery; HBESS; I–V droop controller; hybrid battery energy storage system; decentralised control strategy; virtual impedance; all-electric ships; high discharge rate batteries; state-of-charge regulation algorithm; dynamical state-of-charge regulation; isolated DC microgrid

Subjects: Secondary cells; Multivariable control systems; Voltage control; Other power stations and plants; Control of electric power systems; Secondary cells

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