  Recently, rapid development of battery technology makes it feasible to
integrate renewable generations with battery energy storage system (BESS). The
consideration of BESS life loss for different BESS application scenarios is
economic imperative. In this paper, a novel linear BESS life loss calculation
model for BESS-integrated wind farm in scheduled power tracking is proposed.
Firstly, based on the life cycle times-depth of discharge (DOD) relation-curve,
the BESS life loss coefficient for unit throughput energy with different state
of charge (SOC) can be determined from the life cycle times-DOD relation-curve
fitting function directly. Secondly, as unidirectional variation of SOC in a
single time step, the BESS life loss can be calculated through integration of
the life loss coefficient-SOC relation function. A linear BESS life loss
calculation model is established through self-optimal piecewise linearization
of the primitive function of the life loss coefficient-SOC relation function.
Thirdly, the proposed life loss calculation model is incorporated in the
BESS-integrated wind farm scheduled power tracking optimization. Case studies
demonstrate that with the proposed method, the BESS life loss item can be
incorporated in the optimization model effectively, and the scheduled power
tracking cost of the BESS-integrated wind farm can be determined and optimized
more comprehensively.
