Double-staggered flyback photovoltaic grid-connected micro inverter and control method thereof
A technology of micro-inverter and control method, which is applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve the problems of reducing the quality of grid-connected current waveform, low system power density, and large voltage and current stress of power devices, achieving Taking into account the quality of the grid-connected current waveform, ensuring system reliability and improving system efficiency
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[0049] Set forth the present invention in detail below in conjunction with accompanying drawing and example:
[0050] Such as figure 1 As shown, the topology of the dual-interleaved flyback photovoltaic grid-connected micro-inverter includes the DC side capacitor C PV , double flyback converter, converter bridge and output filter. DC side capacitance C PV Connected with photovoltaic modules; double flyback converters include high frequency transformers T1, T2, reverse blocking power switch S PV1 , S PV2 , power diode D rect1 、D rect2 、D rect3 and D rect4 , the converter bridge includes thyristors S ac1 and S ac2 , S ac1 is the forward commutation bridge arm, S ac2 is the negative commutation bridge arm; C grid and L grid Connect in parallel to form a CL output filter.
[0051] figure 2 It is the control block diagram of the double-interleaved flyback photovoltaic grid-connected micro-inverter of the present invention, and the digital signal processor controls t...
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