Research On Key Control Problems Of Solar Photovoltaic Power Generation System

Since 1980 s,with the acceleration of industrialization and the rapid development of the global economy,the demand for energy has increased dramatically,so the amount of fuel needed by people is increasing rapidly.The limited fossil energy has been increasingly unable to meet the needs of the people,the global energy crisis and environmental pollution has become the inevitable trend of the development of new energy,tidal energy,nuclear energy,solar and other new energy came into being,as a new field of energy related aspects,received extensive attention from all sectors of society,therefore professionals on their research efforts to strengthen gradually.Among them,solar energy has a great advantage in these renewable energy sources,and its unique nature has been paid more and more attention by all countries in the world.Under this background,the solar photovoltaic power generation system as the research object,through the analysis of the solar photovoltaic power generation system,we can see that the control problem of them,including the model of the PV array,maximum power point tracking and converter control strategy etc.The main work and achievements of this paper are as follows:First based on the analysis of the principle of photovoltaic arrays and characteristics,introduces a simulation environment temperature,dynamic model of the PV array light intensity and PV array parameters,and provide the foundation for theoretical analysis and control method of concrete research.Second in the common maximum power point tracking control algorithm analysis,research and comparison,and summarizes its advantages and disadvantages,and verify the effectiveness of the tracking control effect under different light intensity and temperature.Third to study the problem of designing global sliding mode control for DC/DC converter,DC/DC converter is widely used in photovoltaic power generation system,the basic DC/DC converter,selected suitable sliding surface reaction control purpose,method of controller design for the introduction of exponential approach law,by adjusting the control parameters,to achieve the control effect well,which can make the balance between dynamic performance.Fourth study on the chaos control design of DC/DC converter,to study the problem of chaos in the DC/DC converter,the state feedback control method,theDC/DC converter in the chaotic state has been effectively controlled,and enhance the stability of the system.