Robust Control Scheme for a Three Phase Grid-Tied Inverter with LCL Filter during Sensor Failures


This paper discusses the operation of a three phase grid-connected inverter with LCL filter under an unbalanced/distorted grid voltage condition. Two case studies are considered in this paper that relate to the operation during grid side current and voltage sensor failure. First, a case study showing the operation of the inverter during a grid side current sensor failure has been discussed. Second, a case study showing a grid voltage sensor failure has been discussed. For the grid side current sensor failure methodology has been developed and discussed to estimate the grid current from the sensed inverter current and the capacitor voltage reference. For the grid side voltage sensor failure, an internal model based grid voltage estimation architecture has been proposed, and both its local and global stability analyses have been presented. The controller design is based on the Lyapunov energy function, and its derivation during the two types of sensors failure have been discussed and presented along with a detailed mathematical analysis. The proposed architecture has been verified on a reduced-scale laboratory prototype, and various case study results are presented.and both its local and global stability analysis has been presented.


Electrical and Computer Engineering

Keywords and Phrases

&; #x03B1; &; #x03B2; Axis; Capacitors; Computer Architecture; Delays; Dual Second Order Generalized Integrator (DSOGI); Estimation; Inverters; LCL Filter; Lyapunov Energy Function; Mathematical Model; Three Phase Inverter; Unbalanced Grid; Voltage Control; Voltage Sensorless

International Standard Serial Number (ISSN)

0278-0046; 1557-9948

Document Type

Article - Journal

Document Version


File Type





© 2020 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

06 Aug 2020