Research On Optimal Operation Of Electric-heat-gas Integrated Energy System Promoting Wind Power Consumption

China’s new energy industry is developing rapidly,but during the heating period in the north,it is restricted by the "heat to determine electricity",and wind curtailment often occurs,which severely restricts the further development of the new energy industry.In the context of the Internet of Energy,this article uses technical means such as heating grids,energy storage,and electricity to gas from the perspective of the integrated energy system to establish a horizontal electricity,heat,and gas complementary structure,and a vertical “source network load storage” structure.The electric-heat-gas integrated energy system aims to improve the system’s renewable energy consumption level and reduce wind curtailment.First,a basic electric-heat combined system is established,and the system is divided into three parts: "source-network-load".On the source side,the working principles and operating characteristics of thermal power units,cogeneration units and electric boilers are introduced;on the network test,the composition and working principles of the heating network are explained;on the load side,consider the use of time-relaxed flexible heat load.It is pointed out that the system can make use of the thermal dynamic characteristics and flexible heat load of the heating network to alleviate the "wind-heat conflict" during wind abandonment and reduce wind abandonment.An optimized operation model was built,and the krill swarm algorithm with better convergence was considered to solve the model.The working principle of the krill swarm algorithm is introduced,and the algorithm is improved from two aspects: inertia weight and step size scaling factor.Numerical simulation shows that the improved krill swarm algorithm reduces invalid iterations and speeds up convergence.Simultaneously,simulations of different scenarios are set up,which shows that after considering the thermal dynamic characteristics of the heating network and the flexible thermal load in the system,the wind curtailment of the system has been reduced,but there is still a part of remaining.In addition,due to the heat loss included in the thermal dynamics of the heating network,the operating cost of the system has increased to a certain extent.Then,in order to better absorb the wind.On the basis of the electric-heat combined system,two forms of energy storage devices,heat storage and electricity storage,are introduced to establish an electric-heat integrated energy system with a "source-network-load-storage" structure.By improving the krill swarm algorithm to simulate the optimization models of different scenarios,the conclusions are as follows: both the heat storage device and the electricity storage device help reduce wind curtailment,and the heat storage device relies on its lower capacity cost,Power cost and maintenance cost have better economic efficiency and wind curtailment effect than electricity storage device.Explored the mechanism of wind-absorbing and abandoning of two types of energy storage devices,heat storage and electricity storage.Although the working mechanisms of the two are different,they essentially reduce the power output of thermal power units during the peak period of electrical load to improve the grid connection of wind power.Spatial.Finally,on the basis of the electric-heat integrated energy system,the power to gas(P2G)device is introduced to form a new type of electric-heat-gas integrated energy system.The operating principle and cost of the electricity-to-gas technology are introduced,and the improved krill swarm algorithm is used to simulate different setting scenarios.The conclusion is as follows: The price of raw materials for electricity-to-gas technology affects the system to a large extent.Operating conditions and economic costs.When the price of raw materials is0.2 yuan/kW,the economic cost of the electric-heat-gas integrated energy system is the least,and the P2 G device has been working at full power during the low electric load period.When the raw material price is 0.4 yuan/kW,the P2 G device only works when the wind is curtailed,and the cost of the system increases.When the price of raw materials is 0.6 yuan/kW,the P2 G device is completely inoperative,and the wind abandonment and cost of the system are increased.