Photovoltaic circuit, control method and device thereof, equipment and storage medium

Abstract

The invention relates to a photovoltaic circuit, a control method and device thereof, equipment and a storage medium, and relates to the photovoltaic field. The photovoltaic circuit comprises a photovoltaic cell, an active buffer circuit, a single-phase two-bridge-arm inverter circuit, a filter circuit and a power grid. The active buffer circuit comprises a thin-film capacitor, a power compensation circuit, a first decoupling switch tube and a second decoupling switch tube. An active buffer circuit is added in a photovoltaic circuit, through active power decoupling of a thin-film capacitor, a power compensation circuit, a first decoupling switch tube and a second decoupling switch tube, the stability of the direct current side voltage of a single-phase two-bridge-arm inverter circuit is maintained, and the influence of alternating current side power pulsation of the single-phase two-bridge-arm inverter circuit is avoided. The active buffer circuit can replace an electrolytic capacitor, the thin-film capacitor is small in capacitance value and long in service life, the stability of the inverter can be improved, and the problems that the direct-current side power of the single-phase inverter is maintained to be stable by using the electrolytic capacitor, the service life of the electrolytic capacitor is short, and the service life of the inverter is restricted are solved.

Description

technical field [0001] The present application relates to the field of photovoltaics, in particular to a photovoltaic circuit and its control method, device, equipment and storage medium. Background technique [0002] Single-phase inverters have inherent power pulsation problems on the AC side. In order to prevent single-phase inverters from affecting the operating efficiency of DC-side equipment, electrolytic capacitors are widely installed on the DC side of single-phase inverters. [0003] Electrolytic capacitors have the characteristics of large capacity and low price, but at the same time, they are also accompanied by disadvantages such as large volume, short life and low reliability, which has become one of the key obstacles to improving power density. More importantly, electrolytic capacitors reduce the overall reliability of power electronic systems. Based on the research on the fault distribution of power electronic system components, capacitor faults account for abo...

AI Technical Summary

Problems solved by technology

[0003] Electrolytic capacitors have the characteristics of large capacity and low price, but at the same time, they are also accompanied by disadvantages such as large volume, short life and low reliability, which has become one of the key obstacles to improving power density

More importantly, electrolytic capacitors reduce the overall reliability of power electronic systems, based on research on the distribution of faults in power electronic system components, capacitor faults account for about 30%, and for most cases, capacitive faults come from electrolytic capacitors

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