Divided Time-scale Operation Optimization Strategy For New Energy Integrated Combined Cooling,heating,and Power System

The sustained and rapid development of the world economy has brought about a sharp increase in global production and demand,and the level of energy consumption has continued to break through historical highs,which has also triggered a series of energy and environmental crises.Under the global energy shortage and the gradual severe environmental pollution situation,optimizing the adjustment of energy consumption structure and developing emerging energy technologies have become the top priority of people,vigorously developing the combined cooling,heating,and power(CCHP)system with energy saving and environmental protection advantages has become an effective way to improve the energy structure and achieve sustainable development.Driven by new energy technologies,the penetration rate of renewable energy continues to increase,and the random fluctuations in renewable energy and user load exacerbate the uncertainty of the CCHP system’s real-time operation.Therefore,the day ahead scheduling plan often deviates from the actual operating situation.The accumulated deviation of long-term operation will lead to imbalance of energy supply and demand,which will adversely affect the stable and safe operation of the system.However,the current research on the optimization of the intra-day real-time operation of the CCHP system is still based on the same time scale of electricity,cooling and heating and ignores the difference in the time scale of transmission and supply and demand of different energy sources,which is difficult to obtain the expected results in real-time operation planning.This paper focuses on the real-time operation optimization of the CCHP system during the intraday period,and proposes a rolling operation optimization strategy based on the divided time-scale of electricity and cooling/heating,which can realize the collaborative optimization of electricity and cooling/heating energy on different time scales,thereby improving.real-time performance and flexibility of the system operation.The main research contents of this article are as follows:First,the structural composition and operating principle of the new energy CCHP system are described.The corresponding mathematical model is established by analyzing the characteristics of the main equipment of the system.Based on the existing system structure,a detailed analysis of the flow direction of the electric,cold,and heat multi-energy flows within the system is carried out to establish the energy balance constraints of the system operation.After that,the economic,energy and environmental indicators of the system’s daily operation were taken as the comprehensive optimization goals,the energy balance and the upper-lower power limits of each device were used as constraints to build a system operation optimization model.According to the optimization model,a calculation method based on divided time-scale of electricity and cooling/heating energy is proposed.This method based on the idea of fast and slow decomposition in the singular perturbation theory,takes the indoor comfortable temperature as the premise and makes full use of the indoor temperature tunability,decompose the fast and slow subsystems of the optimization model.Genetic algorithm is used as the solution algorithm,the source and load input information of the system is continuously updated according to changes in environmental conditions and actual conditions.Perform open-loop rolling optimization of the optimization model online in order to achieve collaborative optimization and real-time scheduling of electricity and cooling/heating energy at different time scales.Finally,the MVC design pattern under the B/S architecture is used to design and develop the CCHP operation optimization information management system.It mainly uses Web development technologies such as JSP,Servlet and MySQL,uses Eclipse as a development tool to build an informational CCHP operation optimization management platform,designing and implementing user login,optimization scheduling strategy management,operation optimization information management,permission setting and other functions by Java language.The implementation of the system facilitates relevant technical personnel to grasp CCHP operation optimization information in time,improves the scientific management level of CCHP system operation optimization information,and promotes the implementation and application of CCHP system operation optimization strategies.