Multiple Time Scales Optimal Operation Of Integrated Energy System Considering Demand Side Management

With the continuous improvement of users' requirements for the diversity and flexibility of energy supply forms,integrated energy system,as a micro energy hub that can realize the cold and hot electric power supply,has been widely concerned in recent years.In the integrated energy system,different forms of distributed generation resources and demand side management resources are integrated and managed,supplemented by energy management system,monitoring system and other automatic safety devices,so as to achieve multi energy complementary coordination.On this basis,how to realize the optimal operation method of comprehensive energy system has become an important topic.In this paper,for the optimal operation of the integrated energy system,the demand side management method is considered to establish its optimal operation method with multiple time scales.The specific contents are as follows:Firstly,based on the definition of integrated energy system,its structure was analyzed.The basic concept and grid structure of integrated energy system were analyzed,and the mechanism of multi energy complementary coordination and energy transformation flow path were sorted out.Based on the working principle of main equipment in each subsystem of comprehensive energy,the mathematical model was established,the function of coupling equipment in each subsystem of comprehensive energy was analyzed,the energy conversion relationship between different networks was analyzed,and the operation relationship between different time scales is also discussed.Secondly,a day ahead optimal operation model of integrated energy system considering load shifting was established.Based on the short-term predicted power of the next day's renewable distributed generation and load level,an optimized operation model is built.The objective function of the model was to minimize the operation cost of comprehensive energy system including the operation cost of electric energy subsystem,thermal energy subsystem and gas energy subsystem,taking into account the translational negative load constraint,power balance constraint of electric energy subsystem,node voltage constraint of electric energy subsystem and energy storage design Reserve operation constraint,exchange power constraint with external network,thermal subsystem constraint and gas energy subsystem constraint.According to the model,the output plan and load translation plan of the system can be made.The adaptive inertia weight coefficient was introduced into the basic Empire competition algorithm to improve,and the improved Empire competition algorithm is used to design the solution process;through simulation examples,the day ahead optimization operation scheme and load translation scheme of the integrated energy system under typical summer operation day and typical winter operation day are formulated respectively.Finally,a real-time optimal operation model of integrated energy system considering direct control load and interruptible load was established.Based on the optimal operation plan,the model was adjusted based on the deviation of renewable distributed generation and ultra short-term load level prediction.The objective function of the intra day real-time optimal operation model was to minimize the real-time adjustment cost of the comprehensive energy system in the rolling time window,considering the power balance constraints of the intra day real-time electric energy subsystem,the power balance constraints of the intra day real-time gas energy subsystem,the direct control load and interruptible load management constraints,the fuel cell output adjustment constraints,and the exchange power adjustment constraints with the external network,power constraints of wind and light abandonment,and power adjustment constraints of electric to air unit.The improved Empire competition algorithm was used to solve the model,and a real-time operation plan adjustment scheme is determined by an example.Through the above research from the day ahead optimized operation of the integrated energy system to the real-time optimized operation in the day,we can provide the complete solutions for the optimized operation of the integrated energy system and the formulation of demand side management scheme,so as to reduce the operation cost of the system and improve the reliability of energy supply.