模块化混合储能系统及其能量管理策略

Modular hybrid energy storage system and its energy management strategy

针对孤岛直流微网功率缺额补偿和多类型储能介质、多组储能单元间的功率分配问题,设计了一种"储能单元-混合储能模块-混合储能系统"的模块化系统集成架构,并提出相应的全局优化与局部分配相结合的双层能量管理策略。上层优化根据直流母线电压越限情况,快速计算微网的功率缺额;进而考虑各储能模块的最大可支持功率和剩余容量,借助"能者多劳"的原则,寻求运行经济性最佳的模块间功率分配方案。下层分配根据各模块内储能单元的荷电状态分区组合,动态决策储能单元的运行优先级,将上层结果在各单元间进一步细分。算例结果表明,所提策略能够在保证直流微网稳定运行的同时,兼顾储能系统的运行经济性。

Aiming at the problems of power shortage compensation of the islanded DC microgrid and the power allocation among multiple types of energy storage media and multiple energy storage units,a modular integrated architecture of "ESU( Energy Storage Unit)-HESM( Hybrid Energy Storage Module)-HESS( Hybrid Energy Storage System) "is designed,and the corresponding dual-level energy management strategy combined with global optimization and local allocation is proposed.The upper-level optimization calculates the power shortage of the microgrid quickly based on the over-limit of DC bus voltage,and then considering the maximum supportable power and residual capacity of each HESM and making use of the principle of "able one should do more work",the power allocation scheme among HESMs with the best operation economy is found.The lower-level controllers decide the operation priorities of ESUs and allocate the upper level results among ESUs based on the partition combination of SOC( State Of Charge)of each ESU.The example results show that the proposed strategy can maintain the stable operation of the DC microgrid while ensuring the good operation economy of the HESS.