Simulation Study of Flyback Photovoltaic Micro Inverter Based on Volt Seconds
In response to the problem of grid current distortion caused by double frequency voltage ripple in traditional flyback micro inverters,a volt second based control method for flyback micro inverters in intermittent excitation inductor current mode is proposed.According to the harmonic suppression strategy,small signal modeling is performed on the flyback micro inverter,and the correctness of the modeling is verified using frequency sweep.By deriving design criteria for transformer parameters and considering the relationship between transformer parameters and input voltage regulation range and losses,the optimization design and simulation are carried out.The results demonstrate the accuracy of the proposed control method.Compared with traditional open loop current control methods,the THD of the output current is lower,reaching 3.783％.
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