NDLI: Robust nested loop control scheme for LCL-filtered inverter-based DG unit in grid-connected and islanded modes

Content Provider	IET Digital Library
Author	Buduma, Parusharamulu Panda, Gayadhar
Abstract	The grid feeding and grid forming inverters are important candidates in grid connected and islanded modes (IMs) of microgrid system, respectively. The grid feeding inverter supplies the preset power during grid-connected mode and the grid forming inverter generates a reference voltage for other distributed generation (DG) interfacing inverters in IM. In such scenario, the proper control of these inverters is an utmost importance. Generally, a nested loop control strategy uses a conventional PI controller for the inner and outer loops of grid feeding and grid forming inverter, but it gives deteriorative performance under parameter uncertainty condition. This study proposes a robust nested loop control scheme with the mixed H ∞ / H 2 optimal controller in the outer voltage control loop and the robust linear quadratic regulator (LQR) state feedback controller in the inner current control loop for the smooth operation of the system in both modes. The simulation and experimental results of the DG unit with proposed control scheme demonstrate good stability and performance robustness under the parameter uncertainty. Also, superior transient and steady-state performance are confirmed over the conventional controller.
Starting Page	1269
Ending Page	1285
Page Count	17
ISSN	17521416
Volume Number	12
e-ISSN	17521424
Issue Number	Issue 11, Aug (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/12/11
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2017.0803
Journal	IET Renewable Power Generation
Publisher Date	2018-04-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Control of Electric Power System Current Control Distributed Generation Interfacing Inverters Distributed Power Generation Electric Current Control Grid Feeding Inverter Grid Forming Inverter Grid-connected Mode H∞ Control Inner Current Control Loop Invertors Islanded Mode LCL-filtered Inverter-based DG Unit Linear Quadratic Control Microgrid System Mixed H∞-H2 Optimal Controller Optimal Control Outer Voltage Control Loop Parameter Uncertainty Condition PI Controller Power Generation Control Reference Voltage Robust Control Robust LQR State Feedback Controller Robust Nested Loop Control Scheme Stability in Control Theory State Feedback Steady-state Performance Transient Performance Uncertain System Voltage Control
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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