Design and control of online battery energy storage system using programmable logic controller

Abstract

The integration of online battery energy storage systems (BESS) with the grid has been used to supply peak demand, improve the stability and power quality of the gird, and work as a backup during source intermittency at a watt-hour scale. To ensure high reliability and safe operation of the online BESS, an efficient control is required. The limitations of the existing controllers include their incapability to handle high-power rating BESS, short life cycle, insufficient electromagnetic immunity, and limited numbers of input and output interfaces. Therefore, in this paper, the programmable logic controller (PLC) is used to control a 200 kWh BESS to operate as an online back-up for the grid. Siemens software, (TIA Portal V13) has been used to simulate the BESS with the proposed control. The PLC programming code is written using SIMATIC STEP 7, while SIMATIC WinCC is used to build the interfaces of the supervisory control and data acquisition (SCADA) system. The results show that the PLC provides an efficient, easy and reliable control of the BESS.