A novel parallel control for modular energy storage system achieving high performance, redundancy and applicability

This paper proposes a novel parallel control for modular ESSs through the comparative analysis of various conventional parallel control types The VSI modules for ESSs operating in parallel must satisfy the following fundamental requirements: 1) high load sharing performance, 2) tight output regulation, 3) high redundancy, 4) high applicability to both modes for ESSs However, conventional approaches failed to achieve the both goal of high redundancy and high load sharing performance at once. On the contrary, the proposed parallelism control directly controls their output current of each VSI, leading to achieving an excellent load sharing performance without knowledge of their rated-powers and how many VSIs are connected. The verification of the proposed control algorithm is verified by simulation results, 30 kW ESS prototype, and its experimental results.