A power decoupling control method based on photovoltaic grid-connected micro-inverter
A technology of power decoupling and micro-inverter, applied in the direction of converting irreversible DC power input to AC power output, photovoltaic power generation, single-grid parallel feeding arrangement, etc. The overall life of the inverter system, the life of electrolytic capacitors and the life of photovoltaic modules are reduced, so as to avoid reverse recovery loss, improve service life and stability, and compact the power stage.
Inactive Publication Date: 2015-10-07
SOUTHEAST UNIV +3
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[0034] The present invention will be further described below in combination with specific embodiments and accompanying drawings.
[0035] refer to figure 1 , a photovoltaic grid-connected micro-inverter with power decoupling function of the present invention, it includes a power decoupling circuit 10, flyback converter 20, inverter circuit 30, output filter circuit 40; solar photovoltaic array V pv Through an input filter capacitor C connected in parallel to the output voltage of the solar photovoltaic array dc and through an input diode D 3 It is connected with the input end of the power decoupling circuit 10; the output end of the flyback transformer 20 is connected with the inverter circuit 30, and the inverter circuit 30 is connected with the output filter circuit 40; the output end of the power decoupling circuit 10 is connected with the flyback The primary sides of the converter 20 are connected.
[0036] The power decoupling circuit 10 includes a decoupling switch S ...
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The invention discloses a photovoltaic grid-connection micro inverter and a power decoupling control method. The micro inverter comprises a flyback conversion circuit, an inverter circuit and an output filter circuit. The flyback conversion circuit has the advantages of conducting the independent control over each micro inverter body, respectively determining grid-connection currents of the grid-connection micro inverter, being provided with a novel power decoupling circuit so as to remove the low-frequency power pulse occurring in a direct-current input bus, and achieving the aim that a thin-film capacitor is adopted to replace an electrolytic capacitor on the side of the direct-current input bus in the prior art. According to the thin-film capacitor, the service life of the inverter is prolonged, the stability of the inverter is improved, MPPT can be achieved, the decoupling circuit adopted in the system can restrain the influences of the leakage inductance of a transformer on the circuit, therefore, a leakage inductance absorption circuit can not be additionally arranged in the circuit, and therefore the photovoltaic grid-connection micro inverter has the advantages of being compact in power level, high in working efficiency and small in size.
Description
technical field [0001] The invention belongs to the field of micro-inverters and their control, and relates to a solar photovoltaic grid-connected micro-inverter, in particular to a photovoltaic grid-connected micro-inverter with power decoupling function. Background technique [0002] Solar energy has the advantages of "infinite" reserves, universality, cleanness of development and utilization, and gradually revealed economics. Its development and utilization is the ultimate solution to conventional energy, especially energy shortages, environmental pollution and greenhouses caused by fossil energy. It is an effective way to solve problems such as energy consumption, and is an ideal alternative energy source for human beings. [0003] In the photovoltaic grid-connected power generation system, the photovoltaic grid-connected inverter is the bridge connecting the photovoltaic module and the grid. It not only needs to control the output of the photovoltaic module in real time...
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IPC IPC(8): H02M7/48H02J3/38
CPCY02E10/56
Inventor 时斌杨露露王旭杨林王海潜谢珍建祁万春
Owner SOUTHEAST UNIV