LOW-POWER HIGH EFFICIENCY FLYBACK MODE IN DAB CONVERTER FOR BI-DIRECTIONAL PV MICRO INVERTER APPLICATIONS

Electrical and Electronics Engineering

This paper presents photovoltaic micro inverters (MIVs) with integrated battery storage used in Distribution power generation. The dual active bridge topology was selected based on following specifications .Galvanic isolation Soft switching operation Simple phase shift power control. The dual active bridge with the storage for which it can be used transferred energy to other elements in the grid .A novel DAB switching scheme was introduced for ac –dc stage of module integrated power converters for PV applications. The modified flyback switching scheme exhibits 8% higher efficiency than DAB mode at 10 W, which comes at the cost of an additional switch. While flyback mode exhibits more core losses and slightly more conduction losses compared to DAB mode, the switching losses are significantly reduced by eliminating most of the switching actions and reducing the frequency. In addition, it was shown that the flyback mode achieves higher accuracy in power regulation for low-power levels compared to the DAB mode, resulting in a more stable operation and avoiding potential limit cycle oscillations. The proposed dual-mode control scheme is simulated using MATLAB software at low power

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