The Tesearch On MPPT Of Single Grid-Connected Photovoltaic And Anti-islanding

With the progress of economy continues, non-renewable energy sources began to dwindle, to explore new renewable energy development for the world of great significance. Its unique advantages of photovoltaic power generation will become a major new energy. Grid-connected PV systems is the nature of power and photovoltaic power generation system connected to a common power to the load.Grid-connected system main circuit parameter design for the entire system is very important, it directly affects the efficiency of the system. At the same time, DC and AC filter design for the stability of the whole system is also very important.Based on the simulation model of photovoltaic cell, establish the grid-connected photovoltaic maximum power point tracking simulation model, Then comparative and analysis the two commonly tracking mode.Solar photovoltaic grid-connected generation system must prevent the island effect occurs, this paper makes a detailed analysis of active and passive disturbance disturbance method, and put forward the comparative frequency of active frequency drift method.Based on DSPTMS320LF2407,the paper design the single phase photovoltaic grid-connected generation system,Including data acquisition signal conditioning circuit, capture circuit, driving circuit, the inverter control scheme, the selection of software phase locked loop, protection circuit, provide a reliable application platform。Finally, using MATLAB to simulate and analysis the design of maximum power point tracking method, The experimental results show that:the improved optimal gradient method,with the change of the sunshine, obtain a well effective; use the positive and negative frequency comparison frequency shift method,poor effect on the power quality detection, simple and convenient, the system is stable and feasible.