Filter Capacitor Current Estimation and Grid Current Control in LCL Based Grid Connected Inverter


The control of the grid side current in an LCL filter based grid connected converter is generally complex and involve multi loop structure. This paper presents a method to control the grid current indirectly by controlling the converter side current with compensation of the filter capacitor current. The proposed control algorithm uses only one current sensor to measure the converter side current. The filter capacitor current need to be estimated and an estimation method is presented to do the same. Simulation and experimental results are presented to confirm the feasibility of the proposed scheme.

Meeting Name

9th Annual IEEE Energy Conversion Congress and Exposition (2017: Oct. 1-5, Cincinnati, OH)


Electrical and Computer Engineering

Research Center/Lab(s)

Intelligent Systems Center

Keywords and Phrases

Bandpass Filters; Electric Current Control; Electric Inverters; Adaptive Estimation; Current Sensors; Estimation Methods; Filter Capacitors; Grid Connected Inverters; Grid Current; Grid-Connected Converters; LCL Filters; Energy Conversion; Current Control; Grid Connected Converter; LCL Filter; Capacitors; Active Filters; Estimation; Filtering Algorithms; Power Harmonic Filters; Inverters; Invertors; Power Filters; Power Grids

International Standard Book Number (ISBN)

978-1509029983; 978-1509029990

Document Type

Article - Conference proceedings

Document Version


File Type





© 2017 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Oct 2017