Optimal Scheduling Of Integrated Energy System Based On Multi-energy Complementarity

In view of the unbalanced energy structure,low energy supply efficiency and serious environmental pollution,it is urgent to build a safe,efficient,clean and low-carbon energy system.The emergence of the integrated energy system is a breakthrough in the traditional single energy system,integrating various types of energy sources such as electricity,gas,cold,heat and other energy sources,and centralized scheduling,to achieve the complementarity between fossil energy,renewable energy and other kinds of energy and the cascade utilization of energy in the system.It's a direction of energy system development.The park's integrated energy system is one of the main forms of the integrated energy system.Research on the framework structure,equipment composition,scheduling and operation of the park system is also the basis of the research on the integrated energy system,which is of great significance to promote the transformation of energy structure and establish a new energy system.At the beginning,an overview of the integrated energy system is presented,and the park's multi-energy system framework studied is proposed.And established mathematical model of each distributed unit in the park.It mainly includes the mathematical power model of energy conversion equipment such as power to gas,gas turbines,electric boilers,combined heat and power,and energy storage units composed of gas storage and heat storage,and restricts the output,start and stop of each equipment.Laid a theoretical foundation for the analysis and research of the multi-energy complementary park optimal scheduling model in the subsequent chapters.At the same time,the economic dispatch model of the park's integrated energy system is proposed.According to the requirements of demand side including electricity,gas and heat load in the dispatch cycle,as well as the complementary cooperation and output constraints of various energy conversion and storage equipment.Meanwhile,a strategy with the park's overall dispatch cost as the goal is proposed.The scheduling objectives mainly considering the cost of purchasing energy from the upper-level energy network,the cost of equipment startup and shutdown,and add the penalty of wind and photovoltaic abandonment into the target function to promote the absorption of the new energy;Meantime,the load side demand response is introduced,cooperate with time-of-use electricity prices,reduce the purchase of electricity from power grids,increase the income from electricity sales,and reduce the park's dispatch costs.Finally,for the mixed nonlinear integer characteristics of the day ahead economic dispatch model of the park's integrated energy system,0-1 variables are introduced for linearization,so that the day ahead economic dispatch optimization model becomes a mixed integer linear programming model and solved by the CPLEX.At last,using a typical winter daily load in a park to set scheduling schemes to analyzes the multi-energy integrated situation of the park,the coordinated output of each unit,the new energy consumption and the scheduling cost.The results showed the effective of the proposed park's day ahead optimized scheduling model and the use of multi-energy conversion units in reducing park dispatching costs and increasing renewable energy penetration.