College of Electrical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang Province, China
Abstract:
In order to fully consume clean energy and improve energy efficiency, the concept of integrated energy system was put foward. Compared with the traditional single-stage energy utilization, integrated energy system makes multi-level use of various forms of energy such as power, heat and cold and natural gas, and achieves the improvement of integrated energy utilization efficiency through multi-energy complementarity. However, due to the close coupling between the systems and the complex changes of energy flow, the integrated energy system is quite different from the traditional power grid in terms of optimal operation. The research status of optimal operation of integrated energy system was comprehensively sorted out. Firstly, the composition of integrated energy system was introduced. The research status of power, heat and natural gas network power flow models was summarized and analyzed. Secondly, the optimal operation methods were classified and summarized, and the advantages, disadvantages and difficulties of existing methods were analyzed. Finally, the future research direction of the integrated energy system was pointed out.
