Aiming at the composition of grid-connected photovoltaic inverter

the loss mechanism and the influence factors are analyzed detail by detail. The focus is on the comparative analysis between the power losses of transformer and filter inductor. The economic operation critical power of multi- machine photovoltaic grid- connected inverter parallel power system is derived. And an optimum control scheme is put forward. For a power system composed of two 3 k W photovoltaic grid- connected inverter

both experimental waveforms and efficiency data are analyzed with 1 or 2 injected inverters. It verifies that the proposed control method is correct.