Transformer -free photovoltaic grid -connected inverter

• Main Authors: JIN ZHENZHEN, YE QINGFENG, HU KANG, SI XINFANG, FENG XIAOYU, CHEN XIAOYAN
• Format: Patent
• Language: Chinese; English
• Published: 12.10.2016
• 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 utility model provides a transformer -free photovoltaic grid -connected inverter, includes DC power supply VDC, a catching diode D1, the 2nd catching diode D2, contravariant module, output filter inductor L1. The utility model provides a loss that transformer -free photovoltaic grid -connected inverter has formed the electric isolation between the afterflow period between electric wire netting and the photovoltaic board, and the electric current was only managed S2 and fourth freewheeling diode D4 through first switch tube S1 and the 3rd freewheeling diode D3 or second switch and was reduced the switch tube this moment. Additionally, the utility model provides a transformer -free photovoltaic grid -connected inverter does not have the common mode current and produces, has improved system security nature, reliability and system efficiency. 种无变压器型光伏并网逆变器，包括直流电源VDC、第钳位二极管D1、第二钳位二极管D2、逆变模块、输出滤波电感L1。本实用新型所提出的种无变压器型光伏并网逆变器，在续流期间电网与光伏板之间形成了电气隔离，此时电流只经过第开关管S1与第三续流二极管D3或第二开关管S2与第四续流二极管D4降低了开关管的损耗。另外，本实用新型所提出的种无变压器