Research And Design Of Small-Scale Independent Wind-solar Hybrid Generation System

As the rapid growth of the world economy,the energy problem is increasingly prominent.Renewable energy,of course,has become a significant way to solve the energy crisis and environmental problems.Wind energy and solar energy,as a kind of green energy,are widely distributed and have strong complementarity in space and time,so they are widely studied and applied.However,these two kinds of energy are greatly affected by environmental conditions,which are easy to cause intermittence and fluctuation of power supply in use.The key of the research is how to combine the two energy sources effectively and keep the continuity and economy of the system output power.Based on circuit structure of wind solar complementary system,this paper studied the maximum power tracking and energy storage system to realize the complementary power generation of wind and solar energy.First,through the research of the independent wind and solar complementary system which is widely used at present,it analyzed the structure and principle of the system.As well,it deeply analyzed the power generation principles of photovoltaic cells and wind turbines,and built a simulation model of photovoltaic panels and fans according to its mathematical model.It studied the working principle and circuit topology of the battery.By using double input boost circuit,photovoltaic and wind power generation are combined in one circuit,then the bi-directional DC/DC converter circuit is connected to the battery.Second,it studied the maximum power tracking of photovoltaic power generation and wind power generation,and verified the feasibility of the tracking strategy by simulation.In terms of photovoltaic power generation system,it,depending on the disturbance observation method,designed a fuzzy control method combining disturbance observation method.In terms of wind power generation system,it adopted mountain climbing search method.Under the maximum power tracking control,it is verified by simulation that in the double input boost circuit,the maximum power can be output by wind solar complementary or single power input and system.And the control strategy of battery charge and discharge is designed,and the constant voltage charge and discharge control strategy controlled by PI is used for simulation.Finally,it designed the hardware and software of the system.The core of hardware is DSP control chip,including voltage sampling circuit,current sampling circuit,driving circuit,etc.In the software part,CCS5.3 is used as the platform,and C language is used to program,covering the main program design,AD sampling program,PWM generation program and battery charging and discharging program.The thesis completed the overall design of the wind-solar hybrid generation system,which can achieve the maximum power output of the photovoltaic power generation system and wind power generation system in one circuit.The battery can be charged and discharged according to the system requirements,and the system can operate stably and economically.