Research On Operation Of Integrated Energy System Considering Uncertainty Of Wind Power Output

With the increasing degree of coupling between various types of energy,the traditional single power system operation model has been unable to meet the new demand of energy development,so the comprehensive energy system which can meet the two-way flow of energy has been proposed.With the rapid development of energy coupling devices and Internet technology,the two-way flow between the information source and energy source of the new network is realized,which enhances the coupling between the natural gas network and the power system.Power to gas equipment can change the one-way operation mode of electric to natural gas into two-way coupling operation mode,and provide a new path for new energy conversion and consumption.In this paper,first of all,taking the optimization of system investment cost and operation cost as the goal,considering the constraints of system energy balance,unit output and so on,a refined model of electricity gas integrated energy system with power to gas equipment is established.Based on the improved IEEE30 node power system and natural gas system,the simulation is carried out to analyze the influence of the power to gas equipment on the system peak shaving and valley filling and wind power acceptance,and to verify the effectiveness and feasibility of the power to gas equipment in the integrated energy system model.On this basis,this paper further analyzes the comprehensive energy system operation model of cooling heating power and natural gas.Due to the fluctuation and intermittence of wind speed,wind power generation has the characteristics of uncertainty.In this paper,Weibull distribution is used to simulate wind power,and robust parameters are introduced to describe the uncertainty of wind power.In this paper,the objective function is to optimize the system operation cost and air abandonment cost,and the constraints of system energy balance,unit output,energy storage device,etc.are considered.The difference of system operation cost under different robust parameters and wind power consumption rate is analyzed by examples.In order to solve the operation model of the comprehensive energy system,this paper uses Benders Decomposition Method to divide the problem into the main problem of the total investment cost and the sub problem of the lowest cost of wind abandonment to iteratively calculate the optimal value of the total cost of the system.Finally,the YALMIP toolbox is called by MATLAB software and solved by CPLEX solver.The simulation results show the correctness and effectiveness of the proposed model and solution method.