Research On Electricity-Heating Dispatch In An Integrated Energy System For Renewable Integration

In the face of increasingly serious environmental pollution and climate change.vigorously developing and using new energy has become the consensus of the international community.In recent years,renewable energy represented by wind power and solar power has developed rapidly in China,which has become the country with the most wind power and photovoltaic installations in the world.However,due to the influence of power structure,grid structure,market policy,etc.,China,especially the three Norths area,has experienced a serious phenomenon of wind power and photovoltaic curtailment,which has also become a bottleneck problem of large-scale renewable integration.From the perspective of power balance,the wind-heat conflict during the heating period in the Three Norths area has severely squeezed the grid space of wind power,which is an important reason for the occurrence of wind curtailment.Aiming at the renewable curtailment caused by operating peak shaving constraints during the heating period of the Three Norths area,this paper proposes an electricity-heat integrated energy system optimal dispatch model and solution method based on flexible resource orderly management and considering source load uncertainty.The main work and innovations of this paper include:(1)According to the operating mechanism and scope of action,three types of flexible resource models have been established in an orderly manner.Mathematical analysis is used to prove their potential in promoting the consumption of renewable energy and improving system flexibility,and provide theories for the establishment of optimal scheduling methods and simulation analysis later.in accordance with.The three types of flexible resources include heat storage equipment and electric boilers used for auxiliary heat supply on the heat source side,heat supply pipe networks and equivalent buildings with thermal inertia on the heat supply side,and the load side is used to adjust the price demand response of user loads.(2)A method of optimal dispatch in an electricity-heat integrated energy system considering flexible resources is proposed.The method aims at minimizing the total cost of the system,introduces system constraints,inputs initialization data to the coordinated control system,conducts optimization simulations in the day-ahead forecast mode and solves linear programming problems,and transmits the optimized variables and the proposed plan back to the power system and the district heating system to realizes the safe and economical operation of the system.Simulation shows that the participation of flexible resources in optimal scheduling can effectively promote the consumption of renewable energy,improve system flexibility and economy,and increase the proportion of flexible resources involved can achieve better optimization results.(3)A source-load uncertainty model is established,using trapezoidal fuzzy parameters to represent the uncertainty of renewable energy and load,and introducing a clear equivalence class of load balance and spinning reserve constraints in the optimal dispatch,improving the coordinated optimal dispatch of the integrated energy system for electricity and heating Method to improve the practicability of optimal scheduling.Numerical example simulation shows that the improved optimal scheduling method has good effects in improving the penetration rate of renewable energy and system economy,and it is feasible and universal.Analyzing the optimization effect under different confidence levels,it can be seen that the confidence level is positively correlated with the total system cost and negatively correlated with the consumption of renewable energy,which has reference significance for actual dispatching decision-making.