Single-stage Five-level Common Ground Transformerless Inverter with Extendable Structure for Centralized Photovoltaics  

作　　者：Vishal Anand Varsha Singh Jagabar Sathik Dhafer Almakhles 

机构地区：[1]Department of Electrical Engineering,National Institute of Technology Raipur,India [2]Renewable Energy Lab,Prince Sultan University,Riyadh,11586,Saudi Arabia [3]Department of Electrical and Electronics Engineering,SRM Institute of Science and Technology,Kattankulathur Campus,603203-Tamil Nadu,India

出　　处：《CSEE Journal of Power and Energy Systems》2023年第1期37-49,共13页中国电机工程学会电力与能源系统学报（英文）

摘　　要：The paper presents a five-level common ground type(5L-CGT),transformer-less inverter topology with double voltage boosting.The proposed inverter uses eight switches and two capacitors,charged at input voltage level.The inverter in its basic form acts as a string inverter for low-power PV applications.However,it can be extended to work as a scalable multi-level inverter with higher power handling capability to act as a centralized inverter.The working of the inverter with the sizing of the components is presented with mathematical analysis.The efficiency of the proposed PV inverter is found using thermal losses associated with switches using PLECS software.A prototype of 1 kW has been designed,and experimentation has been carried out.Various loads with a lagging power factor up to 0.6 have been tested with the inverter to establish the usability of the proposed inverter in a worst-case emulated homeuse scenario.The total harmonic distortion(THD)at the output has been recorded using a power quality analyzer with voltage and current THD values of 4.5%and 2.5%,respectively,which lies within the limits of IEEE 519 standards.The highest power conversion efficiency of the inverter has been recorded to be 96.20%.

关 键 词：Active and reactive power boost inverter common mode voltage(CMV)grid-tied inverters inrush current leakage current photovoltaics 

分 类 号：TM4[电气工程—电器]