A Voltage Sensorless Control of a Three Phase Grid Connected Inverter based on Lyapunov Energy Function under Unbalanced Grid Voltage Condition

Abstract

Voltage sensing in a three-phase grid-connected inverter can be expensive, and introduces vulnerability to the sensor's failure. To address this problem, a sensorless current control strategy is introduced which is composed of two basic elements. First, a current controller based on a Lyapunov energy function is derived by the assumption of known grid voltage. Next, a dual second-order generalized integrator (DSOGI) structure is utilized to extract the positive sequence grid voltage from the Lyapunov-based current controller outputs and generate the unit vectors from the phase locked loop. The methodology presented has been verified in simulation using MATLAB/Simulink and PLECS. Experimental validation is provided by a reduced scale laboratory prototype.

Meeting Name

2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018 (2018: Sep. 23-27, Portland, OR)

Department(s)

Electrical and Computer Engineering

Research Center/Lab(s)

Intelligent Systems Center

Keywords and Phrases

Controllers; Electric current control; Electric inverters; Energy conversion; Locks (fasteners); Lyapunov functions; MATLAB; Phase locked loops; Current controller; Experimental validations; Lyapunov energy functions; Phase Locked Loop (PLL); Second-order generalized integrators; Sensorless; Three-phase grid connected inverters; Voltage sensorless controls; Sensorless control; Dual second order generalized integrator (DSOGI); Lyapunov function based current controller; Voltage sensorless

International Standard Book Number (ISBN)

978-1-4799-7312-5

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2018 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Sep 2018

Link to Full Text

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