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

考虑成本约束及功率分配策略的混合储能配置方法

¹ Department of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
² Xi’an Thermal Power Research Institute Co., Ltd, Xi’an 710054, China

Received: 1 April 2017

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.

摘要

以平抑风电功率波动的混合储能系统为研究对象，提出一种满足波动率与经济性要求的电池和超级电容器容量配置方法，设计以电池操作周期和电池吸收功率截止频率为约束的功率分配策略。通过分析储能系统成本构成，并考虑不同类型储能特性以及运行方式对循环寿命的影响，以混合储能系统日均最小成本为目标函数建立容量优化配置模型。算例分析表明，选择合理的电池操作周期及吸收功率截止频率可有效延长储能使用寿命，进而提高整个混合储能系统经济性。