Robust direct power control of grid-connected photovoltaic systems based on adaptive partial feedback linearization

T. K. Roy, M. A. Mahmud, W. X. Shen, M. E. Haque

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Citations (Scopus)

Abstract

A robust direct power control (DPC) approach is presented in this paper for three-phase grid-connected photovoltaic (PV) systems to control active and reactive power injection through voltage source inverters (VSIs). The dynamical model of three-phase grid-connected PV systems is considered based on the dynamics of active power, reactive power, and DC-link voltage rather than existing dq-axes current dynamics. Partial feedback linearization (FBL) technique is used to linearize the dynamical model of three-phase grid-connected PV systems as it is independent of operating points while simplifying the controller design process. The parameters in the feedback linearized system are considered as unknown and an adaptive backstepping approach is used to obtain the control law while the adaption laws are used to estimate the unknown parameters. The proposed controller will eliminate the parameter sensitivity problems of existing partial feedback linearizing controllers. The theoretical stability of the whole system as well as the convergences of physical properties during the estimation of unknown parameters are guaranteed through the negative definiteness or semi-definiteness of control Lyapunov functions (CLFs). Simulations are carried out to validate the effectiveness of the proposed controller and the results clearly confirm superior performance of the proposed partial FBL scheme as compared to a sliding mode controller (SMC) which has inbuilt robustness against parametric uncertainties.

Original languageEnglish
Title of host publicationProceedings of the 2017 12th IEEE Conference on Industrial Electronics and Applications, ICIEA 2017
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages64-69
Number of pages6
ISBN (Electronic)9781538621035
DOIs
Publication statusPublished - 18 Jun 2017
Externally publishedYes
Event12th IEEE Conference on Industrial Electronics and Applications, ICIEA 2017 - Siem Reap, Cambodia
Duration: 18 Jun 201720 Jun 2017

Publication series

NameProceedings of the 2017 12th IEEE Conference on Industrial Electronics and Applications, ICIEA 2017
Volume2018-February

Conference

Conference12th IEEE Conference on Industrial Electronics and Applications, ICIEA 2017
Country/TerritoryCambodia
CitySiem Reap
Period18/06/1720/06/17

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