NDLI: Robust optimal current control for grid-connected three-phase pulse-width modulated converters

Content Provider	IET Digital Library
Author	Maccari, Luiz Antonio Santini, Claudio Luiz do Amaral Pinheiro, Humberto Oliveira, Ricardo C. L. F. de Montagner, Vinícius Foletto
Abstract	This study deals with the current control of three-phase inverters connected to the grid by means of LCL filters. The control action is given by the feedback of the filter states, in coordinates αβ0, and of the internal states of resonant controllers. The control gains are computed by means of an optimal linear quadratic regulator that is robust to uncertain and time-varying parameters related to the grid impedance at the point of common coupling. As contributions, one has the detailed proof of a robust discrete linear quadratic control, showing its applicability also for the time-varying case, the experimental validation of the results in terms of the total harmonic distortion and harmonic limits for the grid injected current, according to the IEEE 1547 standard, and the analysis of the ℋ∞ norm of the closed-loop system for several values of grid inductance, indicating a value of grid inductance for which one has best performance for the time-invariant case. For comparison, a conventional state feedback controller is designed and implemented, showing the limitation of the non-robust strategy.
Starting Page	1490
Ending Page	1499
Page Count	10
ISSN	17554535
Volume Number	8
e-ISSN	17554543
Issue Number	Issue 8, Aug (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/8/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0787
Journal	IET Power Electronics
Publisher Date	2015-04-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Closed-loop System Control of Electric Power System Control System Synthesis Current Control Discrete Control System Discrete System Electric Current Control Grid Inductance Grid Injected Current Grid-connected Three-phase Pulse-width Modulated Converter Harmonic Distortion Harmonics IEEE 1547 Standard LC Circuit LCL Filter Linear Quadratic Control Linear System Optimal Control Optimal Linear Quadratic Regulator Point of Common Coupling Power Converter Power Harmonic Filter Power Supplies to Apparatus Power Supply Quality Power System Control PWM Power Converter Resonant Controller Resonant Power Converter Robust Control Robust Discrete Linear Quadratic Control Robust Optimal Current Control Stability in Control Theory State Feedback Controller Three-phase Inverter Time Varying Control System Time Varying System Time-varying Parameter Total Harmonic Distortion
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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