Research On Multi-Energy System Scheduling Method With The Conversion Function Of Power To GAS

During the winter heating period in northern China,the pollutants discharged during the working process of coal-fired thermal power units have caused serious smog in Beijing,Tianjin and other northern cities.Therefore,many large cities have promoted the “coal to gas” project,gas-steam combined cycle units are becoming more and more widely used.While improving Environmental performance,they also form multi-energy systems included electric,heat,cold and gas,which can improve Energy efficiency.There are also a large number of wind power resources in the “Three North” area,but the rapid development of wind power has caused a large number of abandoned winds.Emerging electric-to-gas(P2G)technology can convert abandonment of wind into gas for supply to load or storage,while reducing wind and two-way flow of energy between the power system and the gas system.This paper studies the coordinated optimization scheduling of multi-energy systems after considering P2 G equipment,analyzes its impact on wind power consumption.Firstly,the overall architecture of multi-energy system including P2 G equipment is constructed.The basic principle and energy conversion process of P2 G technology are analyzed.The coupled energy flow in multi-energy system is analyzed,and,for supplying fundamental theory for further research,and the mathematical models of coupling elements in multi-energy system are established.Secondly,the start-stop control strategy of P2 G equipment is proposed,and the wind power consumption mechanism of P2 G technology is analyzed.The optimal scheduling model of Multi-energy system with the function of P2 G with the minimum total cost of the system is constructed,and the particle swarm optimization algorithm of the solution model is improved.Through the simulation of the example,in the aspect of the effect of wind power accommodation,two equipment of P2 G and electric boiler,and two combination schemes of gas-steam combined cycle unit combined P2 G and conventional thermoelectric unit combined electric boiler are compared and analyzed.The impact of natural gas prices on the abandonment of and system costs.Finally,gas storage model of gas pipeline and Gas-electric coupling system model based on P2 G coupling are established,and a cooperative optimal dispatching model of multi-energy system considering the gas storage function of the gas pipe is established.Through the simulation of the example,the wind rejection effect of the multi-energy system considering the gas storage function of the gas pipe is analyzed,and the relationship between the gas storage capacity and the P2 G configuration capacity is analyzed.Research showed that the scheme of gas-steam combined cycle unit combined P2 G has better effect on the rate of wind rejection,though the effect of P2 G is not as good as electric boiler.The systems considering gas storage function of the gas pipe can further eliminate the wind,and increase the gas storage capacity of the gas pipe,thereby reducing the P2 G configuration capacity of the system.