Hierarchical optimal operation strategy for multi micro energy systems within distribution system

Recently diverse and heterogeneous energy sources like electricity, heat and gas are widely interconnected and integrated to achieve full cross-border exchange of energy flows, information flows and value flows, which makes the research of integrated energy system (IES) a topic of interest. However, the dynamic characteristics of the energy devices and optimal operation strategy of IES still need to be further studied, especially with the integration of storage system. Besides, the influence of mass IESs on distribution grid is also worth taking note of. This paper aims to establish the model of specific devices in micro IES and propose a hierarchical optimal operation strategy for multi micro IESs within distribution system. The proposed hierarchical framework is presented from the micro IES side and distribution system side with different operating objectives. The case study is conducted on the modified IEEE 14-bus system to verify the rationality and effectiveness of the proposed method in terms of the unit commitment, power balance and economic analysis in the micro IES, together with the quantified distribution grid operational indicators.