Research On Multi-energy Complementary Scheduling Optimization And Benefit Evaluation Model In Park

With the increasingly severe problems of energy supply and environmental protection in China,accelerating the development of clean energy has become the focus of increasing public attention.In recent years,driven by a large number of energy policies,China's clean energy generation capacity and installed capacity have developed rapidly,but subject to the randomness of clean energy generation and the limitations of transmission networks and the reverse distribution between resources and demand.The safe and stable operation of the power system poses problems.Energy Internet aims to improve the performance of energy systems and meet the higher demand for energy from human beings,and to achieve sustainable supply of social energy.The ultimate target is to realize various energy systems such as electricity/gas/heat/cold.Connected to improve the efficiency of comprehensive energy use.The multi-energy complementary system of the park has the characteristics of equipment intelligence,multi-energy coordination,supply and demand dispersion,information symmetry,system flatness,and open transaction,which can coordinate and meet different types of energy needs in the park.Therefore,this paper takes the multi-energy complementary system of the park as the research object,deeply analyzes the complementary effect of energy,and discusses the optimization benefit and evaluation mechanism of the multi-energy complementary system in the park.The main research contents of this paper are as follows:(1)Combining the research results and theories of the multi-energy complementary system in the park.Firstly,it summarizes the research status at home and abroad related to the research content of the comprehensive energy body multi-energy collaboration,multi-energy scheduling,multi-energy coordination and multi-energy coordination.Then,it introduces the basic meaning,model evolution and related policies of the park's multi-energy complementary system,and compares and analyzes the implementation status of the park's multi-energy complementary system in typical countries such as the United States,Japan and France,combined with the implementation of the multi-energy complementary system in the park.The question is given by the corresponding experience.Finally,the mechanism of the multi-energy complementary system of the park on energy utilization is proposed from three aspects:implementation path,mathematical model construction and optimization analysis.(2)Established an optimization model for the clean energy generation dispatching of the park's electricity-storage complementary system.First,based on the joint probability distribution function of wind and photovoltaic unit output,the combined output is simulated.Secondly,the uncertainty set of the unit output force is constructed,and the system output structure is optimized according to the parameter values when the different constraints violate the probability level.Finally,from the simulation results,the increase in the amount of wind power and photovoltaic grids requires the energy storage power station as a backup service to benefit the system.(3)The optimization model of clean energy generation dispatching for the park's electric-thermal complementary system is constructed.Firstly,based on the design of the coupled electric-thermal park integrated energy system,the electric-thermal energy demand response model based on the demand elasticity matrix is constructed,and the various user loads of heat and electricity are included in the scope of demand response.Secondly,the construction is carried out.The maximum benefit of the system is the objective function,and the implementation of the demand response means is taken into consideration,and the simulation scenario is designed.Finally,the results of the example show that by implementing the price-based demand response method,the peak-to-valley time-sharing price and electricity price can promote the change of user energy use behavior,realize the peak-filling and valley filling,and improve the operating efficiency of the park system.(4)The optimization model of clean energy generation dispatching for the park's electric-gas complementary system is constructed.Firstly,the system operation risk is caused by the uncertainty of wind power output in the park's electric-gas complementary system.The new electric gas conversion technology and gas turbine rapid adjustment capability are used to construct a park electric-gas complementary system with two-way gas-electricity conversion.Secondly,aiming at the maximum operating profit of the park's electric-gas complementary system,considering the impact of the green certificate and carbon trading policy on the system operation,and designing a variety of simulation scenarios.Finally,the results of the example show that the park's electric-gas complementary system with gas-to-electricity conversion equipment can obtain higher bidding profits by flexibly bidding in the two markets of electricity and natural gas.(5)The optimization model of multi-energy complementary system scheduling in the park is constructed.Firstly,an economic scheduling model for multi-energy complementary systems in parks with conditional risk value is established.Secondly,considering the constraints of electric,thermal and gas multi-energy flow,CVaR is introduced into the economic dispatch of multi-energy complementary systems with the minimum expected cost and the dispatching power of the conditional risk value supply side.Finally,the simulation results show that when the confidence level is increased,the scheduling risk that the system is subjected to increases accordingly.(6)Designed a comprehensive benefit evaluation model for different types of park complementary systems.Firstly,considering the implementation benefits of the complementary system of the park,based on the system benefits,and considering the economic,environmental and system security aspects of the system operation,a complete comprehensive evaluation index system for the complementary system of the park is established.Then,the integrated weighting model which takes into account the advantages of subjective and objective weighting method is constructed,and the TOPSIS and gray clustering trigonometric function evaluation model of the park complementary system is proposed.The example analysis results show that the proposed comprehensive evaluation method can determine the index well.Weight coefficient;improved TOPSIS and gray clustering trigonometric function evaluation model can rank the advantages and disadvantages of different types of park complementary systems.