INTEGRATED MODELLING AND PLANNING OF REGIONAL INTEGRATED ENERGY SYSTEMS BASED ON EXERGY ANALYSIS

摘要

The planning of a regional integrated energy system (RIES) involving multiple energy forms such as electricity/gas/heating/cooling has always been a complex problem. Improving the efficiency of energy utilization is an important task for RIES planning. The traditional energy efficiency only takes into account the change of energy in quantity, but ignores that in quality, which is impossible to accurately measure the energy utilization level of a RIES. In this paper, the exergy efficiency considering both the quantity and the quality of energy is proposed. First, the concept of energy quality coefficient (EQC) is defined to quantify the differences among different energy forms, and the exergy efficiency calculation method of a RIES is proposed. Secondly, an annual total cost (ATC) of RIES is modelled considering the life cycle cost over the selected time horizon. And then the multi-objective planning model with objectives of economy and exergy efficiency is proposed, which considers both planning and operation. A RIES in Guangzhou is selected as the case study to verify the proposed method.