Multiple-function Control Strategy for Hybrid SLB-NB Energy Storage System

The rapid development of battery-based electric vehicles (BEVs) will bring a huge amount of retired batteries into the energy storage market. These SLB can be used to form BESS in order to provide other multiple valuable services. Recently, the control coordinate of SLB and new battery (NB) attracted much attention. In this paper, a multiple-function control strategy is proposed to coordinate the operation of the hybrid SLB-NB ESS configured in renewable energy generations (REGs) in order to realize the similar control performance as a full new battery formed BESS. Firstly, an equivalent battery capacity determination method (EBDM) is proposed for SLB-NB ESS to obtain the equivalent capacity compared to the full new battery formed BESS. Then aiming at two typical operational modes of the BESS in the REG: peak-valley arbitrage mode (PVAM) and power fluctuation mitigating operation mode (PFMM), two specific control strategies are developed for the hybrid SLB-NB ESS in the REGs in order to achieve a similar control performance as full new battery formed BESS. The performance of the proposed control strategy is verified by the simulation result.