Photovoltaic grid connected inverter with reverse connection prevention function and control method therefor

Abstract

The invention discloses a photovoltaic grid connected inverter with a reverse connection prevention function. The photovoltaic grid connected inverter comprises an inverter unit, a control unit, a filter capacitor and a reverse connection prevention unit; the reverse connection prevention unit is connected with an input end of the inverter unit; and the filter capacitor is bridged between two input ends of the inverter unit. The photovoltaic grid connected inverter also comprises a voltage sampling circuit which is connected with the control unit by signal and is used for sampling voltages at the two ends of the filter capacitor and transmitting the sampling results to the control unit; the reverse connection prevention circuit comprises a current limiting resistor, a reversion prevention diode and a bypass controllable switch; the current limiting resistor is connected in series with the reversion prevention diode; the bypass controllable switch is connected in parallel with a series circuit formed by the current limiting resistor and the reversion prevention diode; and the control end of the bypass controllable switch is connected with the control unit by a signal. The invention also discloses a control method for the photovoltaic grid connected inverter. Compared with the prior art, the photovoltaic grid connected inverter has the advantages of simple structure, safety, high reliability, low requirement on components, and the like.

Description

technical field [0001] The invention relates to a photovoltaic grid-connected inverter, in particular to a photovoltaic grid-connected inverter with a reverse connection prevention function and a control method thereof. Background technique [0002] With the continuous reduction of oil, coal and other resources, and the severe situation of global warming, renewable natural energy such as solar energy and wind energy, which are green and environmentally friendly and have extremely abundant reserves, are becoming more and more popular. Recently, with the advancement of technology, the use of solar energy for photovoltaic power generation has become more and more widespread. In the photovoltaic application of solar energy, photovoltaic grid-connected power generation is an important development trend of solar photovoltaic application, and has become the main form of photovoltaic application. With the wide application of photovoltaic inverters in the market, its safety has also...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of existing photovoltaic grid-connected inverters with anti-reverse connection function, and provide a p

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