Research On Single Phase Photovoltaic Power Supply System

Nowadays,as energy crisis and pollution problem becoming increasingly serious,solar power generation is turning into the conventional energy substitute favored by human because of its unique advantages,such as sustainable developing prospect and pollution-free characteristic.Photovoltaic grid-connected generation as an inevitable trend of the solar energy application,has become an important field of new energy research.Providing eligible electric power with stable quality and reliability is the premise of solar power’s practical use,which is also the top task of photovoltaic grid-connected technology research.Regarding the single-phase photovoltaic power supply system as background,this paper targets at small and medium-sized power supply system and discusses the topological structure and control techniques aiming to optimize the power quality.First,the paper makes comprehensive theoretical analysis of photovoltaic grid-connected power system.Through idealized processing and deep research of two ideal voltage sources,the paper reveals several influencing factors of the electric power quality in the grid-connected condition which provides directions of the control strategy research.Considering the consumers’ requirements of the photovoltaic power system,the paper also designs the function and working pattern of single-phase power supply system.Through the theoretical analysis and simulation experiments,an appropriate main circuit form is determined.In this process,each module of the circuit is designed and parameters are optimized.In addition,on the basis of current research achievements,to realize the dispatchable characteristic of active power,the paper designs a kind of double loop with double control modules strategy:current control module for grid current waveform as the inner loop,power control module for output active power as the outer loop.And the voltage feed-forward unit is added to the control strategy in order to obtain the optimal output electric power.In the Matlab/Simulink simulation environment,the paper sets up the single-phase photovoltaic power supply system simulation model,and with a series of simulation experiments,the flexibility and reliability of proposed control method is verified from several aspects.