Optimal Sizing of Hybrid Energy Storage System Taking into Account Economic Factors and Power Allocation

Abstract

The sizing of hybrid energy storage system (HESS) for smoothing wind power fluctuations was studied in this paper. The goal of the proposed method is to find the optimal sizing of the battery and supercapacitor, and its meet the constraints of the power ramp rate constraint and the economic cost. Therefore, a power allocation strategy which based on the operating period of battery and the cutoff frequency of battery absorption power was proposed. The sizing optimization model, which considered the cost structure of HESS, the ESS characteristics and cycle life in different operating modes, is established by using minimum daily cost as objective function. The results of numerical example shows that the cycle life of ESS can be effectively extended with reasonable operating period of battery and the cutoff frequency of battery absorption power, the cost of HESS can be reduced.

A Hybrid Energy Storage System Strategy for Smoothing Photovoltaic Power Fluctuation Based on Improved HHO-VMD

“…The parameters calculated by the hybrid energy storage system [30,31] are shown in Table 3. According to the annual average configuration cost and constraints of the energy storage system, IHHO is used to solve the annual average cost of a hybrid energy storage capacity configuration system.…”