Topologies for Reduction of Second Harmonic Ripple in Battery Energy Storage Systems

Battery energy storage systems (BESS) are becoming common with the increasing penetration of renewable energy sources. Real-time simulations (RTS) can provide an effective approach in the studies of BESS by reducing initial experimental cost and increasing model and test flexibility. Therefore, the need for developing accurate models of BESS for RTS is rising. This paper develops three RTS models for BESS with detailed power electronics, including ripple-port inverter, boost inverter and H-bridge with series-connected flyback converter. Moreover, the second harmonic current (SHC) affects the battery lifetime. To prolong the lifetime of BESS, the topologies and corresponding control schemes are designed to mitigate the SHC in battery. The operation of the real-time models and the effectiveness of the three topologies is demonstrated through RTS results that also show how the topologies and implementated control schemes can reduce the SHC significantly.