基于集合经验模态分解的交直流混合微电网混合储能容量优化配置

Capacity Optimal Configuration of Hybrid Energy Storage in Hybrid AC/DC Micro-grid Based on Ensemble Empirical Mode Decomposition

针对交直流混合微电网并网联络线功率的波动性带来的新能源消纳瓶颈问题和交、直流子网之间交互功率的优化问题,提出了一种混合储能系统容量优化配置方法。首先,考虑系统净负荷功率和分时电价,确定联络线协议功率和混合储能系统需平抑的总功率;然后,利用集合经验模态分解对混合储能系统总功率进行分析,根据不同滤波阶数下锂电池和超级电容器的充放电功率指令,采用自适应惯性权重的粒子群算法对以锂电池和超级电容器的额定功率和额定容量为优化变量的混合储能容量优化配置模型进行求解;最后,对不同滤波阶数所对应的系统年综合成本进行排序,确定系统年综合成本最小的滤波阶数和对应的储能配置方案。基于某交直流混合微电网进行了算例分析,验证了采用所提方法配置混合储能系统可有效平抑交直流混合微电网并网联络线功率的波动,降低交、直流子网间的换流损耗,提高交直流混合微电网的经济性。

To break though consumption bottlenecks of new energy caused by the fluctuation of the connected tie-line power of the hybrid AC/DC micro-grid,and to optimize of the interaction power between the AC subnet and DC subnet,we propose an capacity optimal configuration method of hybrid energy storage system.The protocol power of the tie-line and the total power of the hybrid energy storage system are determined by net-load power and time-of-use tariff.The total power of the hybrid energy storage system is analyzed by the ensemble empirical modal decomposition.According to the charge and discharge power command of the lithium battery and the super capacitor under different filter orders,the particle swarm optimization algorithm with adaptive inertia weight is used to solve the optimal configuration model of hybrid energy storage capacity by taking the rated power and rated capacity of the lithium battery and the super-capacitor as the optimal variables.By sorting the annual cost of system with different filter orders,the final filter order and the optimal configuration scheme of the hybrid energy storage system are determined.A case study based on a hybrid AC/DC micro-grid is used for verification and analysis.The results have verified that the hybrid energy storage system configured by the proposed method can effectively suppress the fluctuation of the connected tie-line power of the hybrid AC/DC micro-grid,reduce the commutation loss between the AC and DC subnets,and improve the economics of the hybrid AC/DC micro-grid.