Analysis and Validation for an Inverter-side Current Controller in LCL Grid-connected Power Systems
Analysis and Validation for an Inverter-side Current Controller in LCL Grid-connected Power Systems作者机构:the Tecnologico Nacional de Mexico/ITS de Irapuato(TecNM/ITESI)IrapuatoGTO 36821Mexico the School of SciencesAutonomous University of San Luis Potosi(UASLP)San Luis PotosiSLP 78290Mexico Tecnologico de MonterreyN.L.64849Mexico
出 版 物:《Journal of Modern Power Systems and Clean Energy》 (现代电力系统与清洁能源学报(英文))
年 卷 期:2020年第8卷第2期
页 面:387-398页
核心收录:
学科分类:0830[工学-环境科学与工程(可授工学、理学、农学学位)] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0807[工学-动力工程及工程热物理]
主 题:LCL filter transformerless inverter grid connection inverter-side current feedback
摘 要:Transformerless grid-connected inverters offer greater efficiencies when transferring power from renewable energy sources to the electrical grid.If the grid-inverter connection is done with an LCL filter,high attenuation of switching harmonics is achieved while preserving a small-size output filter.However,damping must be included in the controller to assure closed-loop stability.This paper proposes a reference computation methodology for the inverter-side current feedback in a photovoltaic(PV)generation system connected to the grid through an LCL filter.Theoretical analysis of the closed-loop system stability and of the steady-state performance are presented as well as experimental validation of the closed-loop performance.The feedback controller includes active damping and relies on a resonant control structure which improves the ability of dealing with grid harmonic distortion.The controller uses a reduced set of measurements,which requires the inverter-side current and grid voltage only,and assures a power factor close to unity.