Study And Practice Of Photovoltaic Grid-connected Inverter

The solar energy as a kind of renewable energy, it clean pollution-free, and sustainableutilization, has the broad application prospect, and gradually receives the various countries’attention. Photovoltaic power generation technology is paid more and more attention. Asphotovoltaic cell component price continues to lower and photovoltaic technologydevelopment, the solar photovoltaic power generation system will gradually from the currentenergy supplement to alternative energy transition.This paper analyzes the development of photovoltaic power generation technology athome and abroad present situation and application prospect, discussed the photovoltaic gridgeneration system types, structure and parallel in standard, through deeply research the solargrid generation system of the core device-grid inverter control methods, design aphotovoltaic grid generation system of inverter controller.According to many suitable light fell on the inverter topology for a detailedcomparative analysis, determine the a photovoltaic grid inverter main circuit parameters, onthe analysis of the characteristics of photovoltaic array, on the basis of the comparison ofseveral common methods of maximum power point tracking (MPPT) control method, theIncremental conductance method for grid inverter output current to control, and the controlalgorithm based on Boost circuit modeling of photovoltaic power generation control circuitsystem, realized the photovoltaic array maximum power point tracking. The simulation resultsshow that this algorithm can accurately and quickly tracking maximum power point, so as toimprove the utilization rate of system and stable output voltage.Developed a platform based on DSP control chip of photovoltaic grid inverter testprototype, and write the control software. The inverter load power for1kw, grid voltage is220v, performance comply with the design requirements.