Photovoltaic grid-connected three-level inverter

• Main Author: YANG XIAOGUANG
• Format: Patent
• Language: Chinese; English
• Published: 07.11.2012
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention discloses a photovoltaic grid-connected three-level inverter, and relates to equipment which is used for converting irreversible direct-current power input of a semiconductor device with a control grid into alternating current power output and is used together with a power supply system of a power supply. The inverter consists of a photovoltaic array module, six identical switching tubes, two identical diodes, two groups of identical capacitors, two identical inductors and a power grid. The photovoltaic grid-connected three-level inverter does not generate common mode current, has low differential mode voltage, low current ripple and high efficiency, and overcomes the defect that the three-level inverter needs direct-current input voltage which is about two times that of a full-bridge inverter in the prior art.