Research On The Small-Scale Grid Connected Wind-Solar Hybrid Generation System And Photovoltaic Backstepping MPPT

Nowadays,with the shortage of fossil energy,environmental pollution,and people's increasing awareness of environmental protection,new energy sources have become more and more popular.Wind energy and solar energy resources are widely distributed and are suitable for development and utilization.However,a single power generation system is easily limited by the environment and cannot ensure the maximization of resource utilization.Therefore,a wind-solar hybrid power generation system is proposed.The wind-solar hybrid power generation system overcomes the respective deficiencies of photovoltaic power generation and wind power generation,has stronger environmental adaptability,and is more efficient in the use of energy,helping to alleviate fossil energy shortages and environmental pollution.Therefore,many countries vigorously develop wind-solar hybrid power generation systems.Based on the research background of the wind-solar hybrid generation system,the small scale power generation system is studied in this paper.The following aspects have been done:1.The main parts of the system are studied and simulated based on the existing common DC busbar wind-solar hybrid generation system,and the parameters of the wind turbine are combined with the characteristics of the photovoltaic cell.The photovoltaic system model and wind power system model are built in MATLAB/Simulink environment,and the output characteristics of the system under different environment are simulated,such as the influence of temperature and illumination on the power generation of photovoltaic system,and the influence of wind speed on the wind power generation system.2.The control methods of photovoltaic and wind power system MPPTs are studied,and the traditional disturbance observation method is used to control the system.3.In view of the disadvantages of the traditional MPPT control method of photovoltaic system,such as poor stability,unable to realize accurate tracking of maximum power,a new method of maximum power point tracking in photovoltaicpower generation system is presented in this paper,which has simple algorithm.It is easy to be realized in engineering and can guarantee the global stability of the whole system.4.The control strategy of grid-connected inverter is studied.In the control of grid-connected current,combining with the changing characteristics of photovoltaic and wind power system,an improved predictive no-beat algorithm is applied to improve the efficiency of the inverter.Improve grid-connected current harmonics.