Study On Coordination Control And Energy Management Of Wind-hydrogen Hybrid Power Generation System

In the context of carbon neutrality,combining hydrogen production and energy storage with wind power to form a wind-hydrogen hybrid power generation system can not only expand wind power consumption,but also promote the early achievement of the dual-carbon goal.However,the random fluctuation of wind speed is one of the key factors causing the extremely unstable output voltage of the Wind-Hydrogen Hybrid Power Generation System.In addition,the high cost of hydrogen production by electrolysis also limits the large-scale development of wind-hydrogen hybrid power generation systems.Therefore,the thesis proposes a coordinated control method based on hierarchical control and an energy management strategy with multiple time scales,which improves the problems of poor operation stability and low economy of the wind-hydrogen hybrid power generation system.The main content and work of the thesis are as follows:（1）Firstly,the basic structure of the wind-hydrogen hybrid power generation system is introduced,the coordinated control method and the design principle of the energy management strategy are explained,and various factors affecting the stable operation of the system and the operation control problems are introduced.（2）Secondly,based on the above structural analysis,a wind-hydrogen hybrid power generation system simulation model including 10 k W wind turbine,6 k W proton exchange membrane fuel cell,6 k W electrolytic hydrogen production device and a supercapacitor bank was built in MATLAB/Simulink,and analyzed its characteristics.（3）Then,aiming at the real-time operation stability of the system,the thesis proposes a coordinated control method for the wind-hydrogen hybrid power generation system based on hierarchical control.Firstly,considering the relationship between power and current flow among the devices in the system,an upper-layer control module based on the switching strategy of operating conditions is designed to coordinate the output of each device and ensure power balance.On this basis,the device-level control method that fully considers the power characteristics of each device is studied: considering the maximum utilization of wind energy and wind speed characteristics,the MPPT control algorithm based on variable step size P＆O is designed;considering the load-side voltage and frequency stability issues,designed Load-side control method based on V/f;for the nonlinear characteristics and real-time changes of the system,a fuzzy adaptive PI control method is designed.The effectiveness of the coordinated control method is proved by experiments,which can reduce the stability error of the system bus voltage from 4.2% to0.083%;in the operating environment of wind hydrogen storage and wind fuel storage,the adjustment time is shortened by about 6.67% and 11.25%,respectively.（4）At last,in view of the operating economy of the system in different operating scenarios,the thesis proposes an energy management strategy for the wind-hydrogen hybrid power generation system that combines multiple time scales.Firstly,an energy management model based on the minimum operating cost is constructed.After analyzing the operating characteristics and power constraints of the system,the optimization objective and constraint function of the model were established,and designed a PSObased energy management algorithm to solve it,which can be used to optimize the energy flow between devices and reduce the system operating cost.Then the state transition model of the wind-hydrogen hybrid power generation system is constructed,and a realtime phase energy management strategy based on FSM is designed,so that the system can adjust the operating state in time according to the system operating conditions during the real-time operation process,so as to achieve stable operation.Finally,experiments show that the energy management strategy can ensure the stability and economy of the wind-hydrogen hybrid power system.