Robust Passivity-based Control Integrated with UDE Strategy for Grid-Tied Inverter.

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Bibliographic Details
Title:	Robust Passivity-based Control Integrated with UDE Strategy for Grid-Tied Inverter.
Authors:	Uslu, Umit Akin¹ akin.uslu@alanya.edu.tr, Aydemir, Mehmet Timur² timur.aydemir@khas.edu.tr
Source:	Electronics & Electrical Engineering. 2025, Vol. 31 Issue 4, p40-51. 12p.
Subjects:	Robust control, Passivity-based control, Robust statistics, Electric inverters, Transient analysis, Feedback control systems
Abstract:	Uncertainties caused by parametric variations, external disturbances, and modelling errors of grid-tied inverters (GTI) make it challenging to select a proper gain for the desired controller. The performance of conventional passivity-based controller (PBC), which depends on a strictly accurate mathematical model of the system, is seriously deteriorated due to having poor robustness against parametric uncertainties and disturbances. To this end, this paper presents an improved passivity-based controller scheme assisted with uncertainty and disturbance estimator (UDE) for GTI. The UDE that has been adopted into the proposed UDE-PBC loops is used to simultaneously estimate uncertainties, which can achieve robust control and provide zero steady-state error. Moreover, the proposed UDE-PBC enables a two-degree-of-freedom (2DOF) control structure; one dedicated for disturbance rejection and the other for closed-loop tracking response of GTI system. The effectiveness of the proposed control scheme has been verified in an experimental prototype of 2 kW and compared with the base controllers in terms of robustness and transient response. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Uncertainties caused by parametric variations, external disturbances, and modelling errors of grid-tied inverters (GTI) make it challenging to select a proper gain for the desired controller. The performance of conventional passivity-based controller (PBC), which depends on a strictly accurate mathematical model of the system, is seriously deteriorated due to having poor robustness against parametric uncertainties and disturbances. To this end, this paper presents an improved passivity-based controller scheme assisted with uncertainty and disturbance estimator (UDE) for GTI. The UDE that has been adopted into the proposed UDE-PBC loops is used to simultaneously estimate uncertainties, which can achieve robust control and provide zero steady-state error. Moreover, the proposed UDE-PBC enables a two-degree-of-freedom (2DOF) control structure; one dedicated for disturbance rejection and the other for closed-loop tracking response of GTI system. The effectiveness of the proposed control scheme has been verified in an experimental prototype of 2 kW and compared with the base controllers in terms of robustness and transient response. [ABSTRACT FROM AUTHOR]
ISSN:	13921215
DOI:	10.5755/j02.eie.42821