Coordinated Control Of Wind-Photovoltaic-Storage-Hydrogen Coupling System Based On Weight Adjustment MPC

With the continuous development of the world economy and the advancement of the industrialization of various countries,the problems of energy security supply and energy environment are gradually revealed,and people’s demand for energy system is also gradually increasing.The use of traditional fossil fuels to generate electricity not only accelerates the global greenhouse effect,but also causes damage and pollution to the environment on which we live.In order to fit the"double carbon"policy proposed by our country,we should vigorously carry out the use of clean and efficient energy,and adhere to the sustainable development of green energy route.At the same time,hydrogen energy is green and low carbon,power and energy can be designed separately,and has long-term large capacity energy storage potential,which is an emerging and ideal energy storage mode of power system.Therefore,the development and utilization of a comprehensive energy system with wind and light as the main energy sources,and electricity storage and hydrogen storage as energy storage is the key to achieve the goal of double carbon in the future.Firstly,this paper constructs a grid-connected system structure including wind energy,photovoltaic,battery energy storage and hydrogen system,in which the hydrogen system includes electrolytic cell,fuel cell and hydrogen storage tank.In this paper,the mathematical models of fan,photovoltaic,cell,electrolytic cell,hydrogen storage tank and fuel cell are first constructed,the working principle of different units is introduced,and the converter structure required by each unit model and the parameter design process of the converter are clarified,and then the control strategy of each unit system is proposed based on PI control theory.In order to avoid energy storage overlimit after charging and discharging,Therefore,the state information of SOC and SOH is controlled,and a state-based coordinated control strategy is proposed.Finally,the power balance in the model is verified by simulation.Secondly,a control strategy suitable for the wind-light-storage-hydrogen coupled energy grid-connected system is proposed based on the MPC with adjustable weight.Firstly,the principle of model predictive control is introduced in this part,and then the MPC predictive control is simulated by using the custom module s-function.In the controller,this paper established the state-space equation of the wind-light-storage-hydrogen coupling energy system,and then took the minimum interaction between system power and grid power as the objective function to optimize the solution of the objective function.According to the proposed weight change principle under 9 different working conditions,the power of the controllable equipment of the coupling system could be obtained.Finally,the power output from the MPC energy management layer is taken as the reference power of the power control layer,thus realizing the closed-loop online power control.Finally,Matlab/simulink software was used to simulate and analyze the effect of weight matrix R_m on the online quantitative proportional regulation of electric-hydrogen energy storage in the coupled system.In addition,when the battery is in the deep charging area,the battery is in the deep discharge area,and the hydrogen storage is in the extreme area,the power distribution coordination of the electric and hydrogen storage in the coupling system is analyzed according to three different control modes(namely,fixed weight MPC control,adjustable weight MPC control,and state-based coordination control).Thus,the effectiveness and superiority of the proposed control strategy under the weight adjustable MPC control are verified.