NDLI: Robust three degrees of freedom based on H∞ controller of voltage/current loops for DG unit in micro grids

Content Provider	IET Digital Library
Author	Bouzid, Allal El Moubarek Sicard, Pierre Chaoui, Hicham Cheriti, Ahmed
Abstract	This study proposes a cascaded voltage–current robust control strategy for a distributed generator (DG) in microgrids. The main objective of the proposed controller is to improve the performance and power quality of a DG by injecting simultaneously a good sinusoidal voltage/current to the different loads connected to the DG. The proposed cascaded voltage/current controller consists of three degree-of-freedom controller, which is designed by using H∞ control theory based on mixed sensitivity specifications. The choices of appropriate weighting functions Wt , Wu , Wy that satisfy the preset goals to get a robust controller and a transform to a standard H∞ control design problem based on pre-compensator, feedforward and feedback connections are presented. The 3DOF-controller is based on MATLAB R/SimPowerSystems and using RT-EVENTS-toolbox. The controller is evaluated under different scenarios: transient responses with a resistive local load, and loads disturbances in steady-state responses with resistive, resistive inductive, resistive capacitive, and non-linear loads. Simulation and experimental results of resulting waveforms from a DG unit are presented, it confirms the effectiveness of the proposed method in effectively rejecting perturbation and robustness to loads disturbances; both good reference tracking and good transient response, and finally significantly lead to a very low total harmonic distortion.
Starting Page	1413
Ending Page	1424
Page Count	12
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 6, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.6182
Journal	IET Power Electronics
Publisher Date	2019-02-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	3DOF-controller Appropriate Weighting Function Cascaded Voltage-current Compensation Control of Electric Power System Control System Analysis Control System Synthesis Current Control Degree-of-freedom Controller DG Unit Distributed Generator Distributed Power Generation Electric Current Control Feedback Feedback Connections Feedforward Good Transient Response Harmonic Distortion H∞ Control Design Problem H∞ Control Theory Load Disturbances Microgrid System Mixed Sensitivity Specifications Nonlinear Control System Nonlinear Load Optimal Control Perturbation PI Control Power Quality Power Supply Quality Resistive Local Load Robust Control Robust Controller Robustness Sinusoidal Voltage Stability in Control Theory Synthesis Method Transient Response Voltage Control Voltage-current Loops Voltage/current Controller
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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