Research And Design Of Off-grid Wind-solar Hybrid Generation System

With the increasing intensification of energy problem,energy has become the focus of social development.Wind power and solar power,as two kind of renewable energy resource,has increasingly gained attention by people.In this thesis,the off-grid wind-solar hybrid generation system is studied,the maximum power point tracking scheme is determined through control algorithm research and system simulation.The hardware circuit is designed by using dual input Boost circuit,and the software is designed.The goal is to design an independent power generation system with perfect performance to realize complementary generation,which can be used in DC load and AC load.First of all,the present research situation of wind-solar hybrid generation system at home and abroad is summarized,and the basic structure of the system is analyzed.According to the working principle of wind turbine and photovoltaic panel,the mathematical model of wind turbine and photovoltaic panel is built in Matlab/Simulink,and their characteristics are simulated.The application of dual input DC/DC circuit in wind-solar hybrid and the charging and discharging principle of storage battery are studied.Secondly,the wind power generation and photovoltaic power generation model were built in Matlab/Simulink and the maximum power tracking is simulated in it.For wind power generation,based on the traditional hill-climb searching method,a partition variable step hill-climb searching method with threshold is proposed.For solar power generation,an adaptive perturbation observation method is designed on the basis of perturbation observation method,and a variable step length conductance increment method is designed on the basis of fixed-step conductance increment method,according to the control principle of disturbance observation method,the maximum power tracking fuzzy control of photovoltaic is designed.Based on the dual input Boost circuit,a wind-solar hybrid generation system is built in Matlab/Simulink,the maximum power tracking is carried out by using photovoltaic adaptive perturbation observation method and wind partition variable step hill-climb searching method.Finally,the wind and solar hybrid controller hardware system based on the TMS320F28335 is designed,mainly including power main circuit,driving circuit,detection circuit,power auxiliary circuit,rectifier circuit,inverter circuit,etc.In this thesis,the software system is also designed,which includes the main program,A/D sampling subroutine,SPWM subroutine,MPPT controlling subroutine,storage battery charge and discharge subroutine,etc.The simulation results show the superiority of the wind partition variable step hill-climb searching method and the photovoltaic fuzzy control method,the maximum power tracking and inverter of the dual input Boost complementary power generation system are realized at the same time.Each module of hardware is debugged respectively,and the designed controller is systematically tested by using the experimental platform,based on the experimental data obtained,the hardware system implemented the goal of maximum power tracking which can track with the change of external environment automatically.At the same time,the complementary power generation is realized,which can be supplied by single input and double input.