Abstract
This paper proposes a new DC output voltage control for a battery energy storage system (BESS) with a lithium-ion battery based on the state of charge (SoC). The proposed control scheme was verified through computer simulations for a typical stand-alone DC microgrid, which consists of a BESS, photovoltaic (PV) panel, engine generator (EG), and DC load. A scaled hardware prototype for a stand-alone DC microgrid was set up in the lab, in which the proposed control scheme was loaded in a DSP controller. The experimental results were compared with the simulation results for performance verification. The proposed control scheme provides relatively lower variation of the DC grid voltage than the conventional droop control.
Highlights
A microgrid is operated either in connection with a commercial power grid or in a stand-alone manner where a commercial power grid is not available
The engine generator (EG) charges the battery in the battery energy storage system (BESS) and the battery state of charge (SoC) increases from 20% to 60%
A new method of controlling the DC output voltage of a BESS based on the SoC, instead of performing droop control based on the DC output current, was proposed for the stable operation of a stand-alone DC microgrid
Summary
A microgrid is operated either in connection with a commercial power grid or in a stand-alone manner where a commercial power grid is not available. The power of distributed generations, BESS, and load is detected in real-time through a communication link to implement the DC voltage control [10]. To address this issue, droop control has been proposed, in which the output voltage of the BESS is properly adjusted according to the power flow [11,12,13,14,15]. An adaptive droop control for the distributed BESS was proposed in [19,20], where the droop coefficient is determined by the initial droop coefficient and the inverse nth order of the SoC. BESS is required for a PV generator to supply stable power to consumers because remote islands.
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