| The technology of photovoltaic generation is not only a supplement of energy resource, but also has the potentiality to become the major energy resource in the future. It is the main use form of solar power that converting solar energy into electric energy through photovoltaic grid-connected generation system, and transporting the electric energy to power grid. In order to maximize the use of solar energy, a deep research on maximum power point tracking (MPPT) methods and control strategies of grid-connected inverter is made, and simulation verifications are performed.Firstly, the relevant concepts of photovoltaic generation include composition and classification are studied. And the development situation at home and abroad is introduced. So the double-stages photovoltaic grid-connected generation has been chosen as the main topology researched.Secondly, after analyzing the â… -â…¤ character of solar battery, the simulation model of solar battery is established. By contrasting the methods of MPPT, an improved perturb&observe algorithms (P&Q) based on fuzzy control and a Boost topology are applied. Through contrasting the control methods of the current fed to the grid and analyzing the grid-connected circuit, a control strategy of grid-connected inverter based on predictive control is adopted.At last, the simulation model of solar battery, MPPT control and grid-connected inverter control are built on the platform of MATLAB/Simulink. The simulation results confirm the feasibility of the control strategies proposed in this paper. |
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