考虑微电网联络线利用率的混合储能容量优化

The Optimization of Hybrid Energy Storage Capacity Considering the Utilization Rate of Tie Lines in Microgrid

对并网型微电网中的蓄电池和超级电容混合储能系统进行储能容量的优化,利用离散小波变换对微电网中的净负荷功率进行分解,得到满足联络线功率波动要求的联络线功率分配,以及对蓄电池和超级电容的功率分配。考虑联络线利用率的提升,引入联络线功率平移调整量为优化变量参与混合储能容量的优化。建立以经济成本和联络线利用率综合目标为优化目标的模型并采用遗传算法进行求解,即满足经济性要求同时有效提高了微电网的联络线利用率。通过算例进行了验证分析。

The optimization of storage capacity is achieved for hybrid energy storage system with the integration of battery and super capacitor in grid-connected microgrid,and the net load power in microgrid is decomposed by using the discrete wavelet transform to obtain the power distribution of tie lines that meets the requirements of power fluctuation,and to allocate power of battery and super capacitor.Considering the improvement of the utilization ratio of tie lines,the translated adjustment amount of tie-line power is introduced as optimized variable to optimize the hybrid energy storage capacity.The model is built with optimal objective of the economic cost and the utilization ratio of tie lines,and is solved by using of genetic algorithm.It can not only meet the economic requirements,but also effectively improve the utilization ratio of tie lines.In the end,the verification and analysis are carried out through case study.