Performance analysis of an energy system with multiple combined cooling, heating and power systems considering hybrid shared energy storage

Abstract

The performance of multi-CCHP energy system considering hybrid shared energy storage (HSES), which comprises shared electrical energy storage (SEES) and shared thermal energy storage (STES), was analyzed through bi-level optimization. Firstly, the superiority of the HSES operation mode in terms of capacity reduction and cost savings was investigated. The HSES mode effectively utilizes the complementarity of load demand and the differences in energy consumption behavior of multiple CCHPs, which reduces the capacity of electricity and heat storage equipment by 50.5% and 82.7% and reduces the total cost of the CCHP systems by 17.0%. Subsequently, analyses on the effect of energy storage type shows that the HSES mode increases the revenue while reduces the total cost of the CCHP systems compared with SEES and STES modes. Lastly, the effect of the CCHP number on the economic performance of the energy system is investigated under the conditions of fixed and optimized capacity of energy storage stations. Results show that the optimized capacity scheme is more beneficial for the profitability of the HSES station. Moreover, when multiple CCHP systems are involved in energy sharing, the economics of the shared storage station are closely related to the investment cost of the heating pipe network, which is the special character of electro-thermal coupled energy storage.