Two Stage Operation Optimization Of Township Integrated Energy System With Biomass Energy

With the reform of energy structure and the change of environment and climate,the efficient use of energy and increasing the proportion of renewable energy have become the important development trend of energy in the world.In order to further improve the consumption and utilization efficiency of distributed renewable energy,all countries are striving to develop integrated energy systems(IES).The optimal scheduling of IES is a multi variable and multi-dimensional nonlinear optimization problem.The common solving methods face the problems of complex construction functions,low efficiency and unsatisfactory results.On the other hand,biomass energy,as a renewable energy,has huge reserves in rural areas of China,but it has not been fully utilized.Based on this,in order to improve the efficiency of energy utilization,reduce the difficulty of solving IES optimization problem,and promote the efficient application of biomass energy in rural,a two-stage optimization method of township IES is proposed considering biomass energy.First of all.combined heat and power(CHP)is constructed as the core of the downtown integrated energy system structure,analyzed and determined the grid connection mode and operation mode of the system;analyzed the operation mechanism of biomass CHP combustion,heating,evaporation,separation,condensation and other processes,the biomass CHP operation output model is proposed,and the corresponding mathematical model for other equipment in the system is established.Then,a two-stage optimization method of IES considering biomass energy is proposed.In the first stage,considering the loss of heat network,the outlet temperature of multi heating equipment is optimized with the objective of minimizing the total heat supply.In the second stage,considering the whole process of biomass transportation,storage and treatment,the energy supply cost model of biomass CHP is established,and the income model is established considering equipment power generation,heat generation and subsidy income.The output operation optimization of IES equipment is carried out with the goal of maximum daily net income.An adaptive crossover probability differential evolution algorithm and GUROBI solver are used to solve the model.Finally,an 18 bus integrated energy system was built to verify the model.The results show that the proposed two-stage optimization method improves calculation efficiency and reduces the difficulty of solving;the established biomass operation output model,cost model and benefit model can be effectively applied to the operation optimization of IES;the use of cogeneration can improve the utilization efficiency of biomass,and the construction of biomass IES can obtain better benefits.