Research On MPPT And Energy Storage Control Strategy Of Wind-solar Hybrid Power Generation System

In the 21 st century,with the rapid development and progress of the global economy and technology,people’s living standards have already changed.In the face of severe energy and environmental problems,the exploitation and utilization of new energy sources has become an inevitable trend of economic and social development.Renewable such as wind and solar are gaining traction,with widespread distribution,abundant reserves,and environmental protection,which are in line with today’s needs and have been widely used by people.However,they also have certain disadvantages,such as weak power supply stability due to environmental conditions,and fluctuations and intermittency in power supply.Making full use of the characteristics of the two to complement each other,by combining wind and photovoltaic power generation,improving power supply stability,and obtaining efficient and stable electricity.Therefore,the hybrid wind-solar power system control problem has become a hot spot for research nowadays.Firstly,the research status of wind-solar hybrid power generation technology at home and abroad is investigated.The working principles of wind turbine,photovoltaic cell and battery were studied and their working characteristics were simulated and analyzed.Secondly,by analyzing the working characteristics of wind turbines and photovoltaic cells,the corresponding maximum power point tracking methods and principles were obtained.The maximum power point tracking of wind power generation system and photovoltaic power generation system was realized by gradient disturbance observation method and adaptive variable step disturbance observation method.Then the control strategy of the battery was analyzed and the four-stage method was used to charge and discharge the battery.The bidirectional DC/DC converter was used to connect the energy storage system with the wind-solar complementary power generation system.In order to make the system have good dynamic characteristics and strong anti-interference ability,a double-loop PI control structure combining current inner loop and voltage outer loop was adopted to realize the control of bidirectional DC / DC converter.Combined with each subsystem model,the overall model of the wind-solar hybrid power generation system was constructed,and the simulation analysis was carried out to verify the correctness of the battery control.Finally,the energy data such as wind resources and light radiation in Chifeng City were investigated,and the daily electricity consumption of local ordinary users was investigated.According to the field data of Chifeng City,the wind power generation module and photovoltaic power generation module are further simulated and analyzed to verify the feasibility of the selected control method.According to the load situation of local users,the capacity of each module in the wind-solar hybrid power generation system was matched and calculated to obtain the capacity of the components required to meet the load of local users,and the wind-solar hybrid power generation system was simulated and analyzed for the selection of capacity to further verify the feasibility of the system.