| In recent years, with the energy shortage and environmental pollution increasing, humans has developed and used renewable energy, photovoltaic power generation as a development of solar energy has been widespread concern. This article describes designing with MPPT solar power three-phase grid-connected inverter.In this paper, the simulation is based on photovoltaic cell physical equivalent model, established the mathematical model of photovoltaic cells. Based on the established mathematical model, using the Simulink module builds photovoltaic battery simulation model, set up the simulation circuit output characteristics of photovoltaic battery simulation model was verified.First we introduce the output characteristics and the simulation model of photovoltaic cell, we propose the methods and principles of Maximum power point tracking, and describe types of MPPT common methods. Particularly, we simulate the perturbation and observation method with Matlab / Simulink.MPPT control of PV cells is generally through the DC / DC conversion circuit to complete. This research builds simulation model of the MPPT of photovoltaic power generation system with Boost Circuit as the core. On this basis, combined with the perturbation and observation method and simulate this algorithm with Matlab / Simulink.We choose three-phase bridge inverter for photovoltaic grid systems. Inductor filter approach, achieve to make the grid current and grid voltage in the same of frequency and phase, and to control the size of the grid current and power.This design choice dual-loop control mode which is based on current feed forward decoupling, and modulate with bipolar SPWM.Based on the theoretical analysis and simulation study, a solar power grid platform was built up, and the DSP digital controller was selected to realize the grid connected three-phase inverter. The simulation and experiment confirm with each other, and the results proved that the schemes proposed are feasible and effective. |
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