Decoupled Optimization of Integrated Energy System Considering CHP Plant Based on Energy Hub Model

Abstract

By optimally interacting electricity, natural gas, heat, cooling and fuels systems, the integrated energy system (IES) represents a significant opportunity to increase technical, economic and environmental performance compared with classical energy systems. These performance improvements can take place at both the operational and the planning stages. The utilizations of combined heat and power (CHP) units, heat pumps and electric boilers create linkages between different energy supply systems. However, these independent sub-systems are in the charge of different departments need to be concerned, which complicates the optimal dispatch of IES. Regarding this issue, a hierarchical decoupling algorithm is developed to calculate the optimal energy flow of IES. The proposed algorithm requires less iteration because the optimal procedure in sub-systems are operated hierarchically and separately. Case studies are performed based on an IES test system which combines the IEEE 33 bus test system and the Barry Island district heating network. Results testifies the performance of the proposed approach and demonstrates that both electrical and heat network can be affected by the CHP penetration.