Optimal Operation of 2nd Use Battery Energy Storage System through Power Reduction Method

Abstract

The battery energy storage system (BESS) is an epitome area of batteries, which are retired from electric vehicles (EVs). The operational cost and working life of BESS operation is dealt by 2nd use power reduction operation method. The power dispatching to BESS is optimized by use of Particle Swarm Optimization (PSO) algorithm to find out the global optimal solution. The state of health (SOH) caused cost increase is included to optimize the operating cost. During the dispatching of power, consistency in SOH degradation is improved. This method provides an optimal power allocation for BESS with new and retired batteries working together. Apart from this, to enhance the fault tolerant operation potential and increase the working life of retired batteries, a power reduction operation method is used. Battery systems (BSs) with different SOH could be operated efficiently, and slowdowns the fast ageing of batteries. Furthermore, BESS can continue its operation in power reduction phase, when there exists BS which could not continue its working. Thereby, this method not only improves the system stability and reliability but also provides more power throughput. The simulation results show that both power throughput and scheduling time of BESS are increased with the use of power reduction operation method.