Research On Coordinated Scheduling Method Of Integrated Energy System Considering Multi Energy Cooperation

The economic development of our country has been restricted badly by the problem caused by low utilization of energy and large-scale use of fossil fuel.The traditional way of snatching and relying on non-renewable resources has been unable to maintain the economic and social development of our country.The fossil energy era,with oil and coal as its core,is about to end,and what we are going to face is the "era of mixed energy" with complementary energy and fossil energy.Therefore,based on the smart grid,integrated energy systems(IES)integrated with power supply,heating and gas supply systems have been proposed.The integrated energy system has become an important strategic research direction in international energy field for its great significance in improving the energy efficiency,the utilization efficiency of social infrastructure and the energy supply security,as well as promoting the large-scale development of renewable energy and achieving energy conservation and emissions reduction in China.This paper focuses on coordinated scheduling method of integrated energy system.On the one hand,studied the general optimization scheduling model and method of IES considering multi energy complementarity and energy cascade utilization.By coordinating various resources within the IES,multi energy complementarity and energy cascade utilization are realized,and both economy and user satisfaction are taken into account.On the other hand,studied the IDR model and method considering the interaction between higher-level power grid and IES.Through the coordination interaction with the superior energy management system,we can respond to the needs of the higher power grid to achieve the win-win between the users and the superior power grid.The main work and achievements are as follows:1.Taking both the variability of system composition and the complexity of energy flow into consideration,the quasi-steady-state models are constructed for the multiple types of distributed energy equipment in the IES,And based on the analysis of the typical IES composition and structural features,a general IES energy flow description method is proposed.This method meets the requirements of the generality and flexibility of the system modeling well,and lays the foundation for coordinated scheduling model of integrated energy system.2.Based on the quasi-steady-state models of IES energy equipment and the energy flow description method,an optimal scheduling model and method for integrated energy systems with multi energy coordination is proposed.Taking the typical IES economic dispatch problem as example,through the analysis and disposal of the three basic components of target function,optimization variables and constraints,the process of the IES dispatch optimization modeling is elaborated in detail.Finally,the mathematical programming method is selected to solve the model,and the benefits obtained by the optimization model are analyzed.3.Based on the optimal scheduling model and method for integrated energy systems,a multi-energy cooperative optimization model of integrated energy system considering stepped utilization of energy is proposed.Taking the typical IES economic dispatch problem as example,the application of optimal scheduling model and method is described in detail.The example analysis shows that the proposed model follows the idea of scientific energy use of "grade counterparts,stepped utilization",which achieves the stepped utilization of energy according to the grade of heat.4.On the basis of realizing the optimal scheduling of IES,this paper builds the IDR model considering the interaction between higher-level power grid and IES,responding to higher power grid requirements.Through the coordinated of multiple energy sources in IES,we can further excavate the controllable ability of IES,change the user's comprehensive energy consumption behavior,and provide auxiliary services such as peak shaving for the higher-level power grid.In addition,a bidding form considering customer satisfaction is presented,which make the higher-level power grid compensate for the impact on the user's economy and satisfaction more reasonable.Finally,the interests of the users are guaranteed,and the win-win between the Power Grid Corp and the IES users is realized.5.Complete the development of distributed autonomous integrated control system based on scientific and project research.Formulating specific implementation scheme from two aspects of intelligent management software and system hardware.Through effective energy management,the whole process monitoring and optimization management of energy production,energy conversion,energy distribution and energy use in the integrated energy system are realized.And by predicting the trend of future energy use,we can achieve multi energy coordination and Optimal dispatch to meet the economic and ecological goals.In this way,we can provide users with a systematic,and customizable system.