scholarly journals Performance enhancements of DFIG wind turbine using fuzzy-feedback linearization controller augmented by high-gain observer

2020 ◽  
Vol 11 (1) ◽  
pp. 10
Author(s):  
Kada Boureguig ◽  
Abdellah Mansouri ◽  
Ahmed Chouya
Keyword(s):  
Feedback Linearization ◽  
Fuzzy Logic Controller ◽  
Dynamic Performance ◽  
High Gain ◽  
Lyapunov Theory ◽  
Nonlinear Observer ◽  
High Gain Observer ◽  
Rotor Flux ◽  
Doubly Fed ◽  
The Stability

<span>This paper proposes a feedback linearization control of doubly fed induction generator based wind energy systems for improving decoupled control of the active and reactive powers stator. In order to enhance dynamic performance of the controller studied, the adopted control is reinforced by a fuzzy logic controller. This approach is designed without any model of rotor flux estimation. The difficulty of measuring of rotor flux is overcome by using high gain observer. The stability of the nonlinear observer is proved by the Lyapunov theory. Numerical simulations using MATLAB-SIMULINK shown clearly the robustness of the proposed control, particularly to the disturbance rejection and parametric variations compared with the conventional method.</span>

High Gain Observer for Drag Tracking in Mars Entry Longitudinal Guidance

2012 ◽  
Vol 241-244 ◽  
pp. 1374-1378
Author(s):  
Kai Wu ◽  
Hu Tao Cui ◽  
Dong Mei Ma ◽  
Ping Yuan Cui
Keyword(s):  
Model Uncertainty ◽  
Feedback Linearization ◽  
High Gain ◽  
Model Error ◽  
Guidance Law ◽  
High Gain Observer ◽  
Feedback Linearization Control ◽  
Adaptive Guidance ◽  
The Ideal

An extended high gain state and perturbation observer combined with feedback linearization was applied in drag tracking for Mars entry longitudinal guidance. The observer estimates the drag, the drag rate and the perturbation due to model uncertainty and disturbance for drag tracking. Mars entry simulation was performed to assess the performance of the adaptive guidance law. The results demonstrate that the proposed guidance law is robust to model error, and can recover the ideal performance of the feedback linearization control.

A HIGH-GAIN OBSERVER APPROACH APPLIED TO THE ROBUST FEEDBACK LINEARIZATION CONTROL

2007 ◽  
Vol 40 (20) ◽  
pp. 64-69
Author(s):  
Ebrahim Samer El'youssef ◽  
Ubirajara F. Moreno ◽  
Edson R. De Pieri ◽  
Eugênio B. Castelan Neto
Keyword(s):  
Feedback Linearization ◽  
High Gain ◽  
High Gain Observer ◽  
Feedback Linearization Control

scholarly journals A High-Gain Observer-Based Adaptive Super-Twisting Algorithm for DC-Link Voltage Control of NPC Converters

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1110 ◽  
Author(s):  
Xiaoning Shen ◽  
Jianxing Liu ◽  
Abraham Marquez ◽  
Wensheng Luo ◽  
Jose I. Leon ◽  
...  
Keyword(s):  
Disturbance Rejection ◽  
High Efficiency ◽  
Dynamic Performance ◽  
High Gain ◽  
Voltage Regulation ◽  
Industrial Applications ◽  
High Gain Observer ◽  
Twisting Algorithm ◽  
The Impact ◽  
Fast Dynamic

Acting as an interface between the grid and many energy systems, the active front-end (AFE) has been widely used in a large variety of industrial applications. In this paper, in order to ensure the fast dynamic performance and good disturbance rejection ability of the AFE, a high-gain observer (HGO) plus adaptive super-twisting algorithm (STA) for the three-level neutral-point-clamped (NPC) converter is proposed. Comparing with the conventional PI control strategy, the proposed controller implements the adaptive STA in the voltage regulator to provide a faster transient response. The gains of the adaptive STA keep varying according to the rules being reduced in steady state but increasing in transient conditions. Therefore, the chattering phenomenon is mitigated and the dynamic response is guaranteed. Additionally, to undermine the impact of external disturbances on the dc-link voltage, a high-efficiency HGO is designed in the voltage regulation loop to reject it. Experimental results based on a three-level NPC prototype are given and compared with the conventional PI method to validate the fast dynamic performance and high disturbance rejection ability of the proposed approach.

Design of a Robust Observer with Super-Twisting Algorithm for Simultaneous Concentration Estimation and Faults Reconstruction in a CSTR

2019 ◽  
Vol 17 (8) ◽  
Author(s):  
M. Boudjellal ◽  
R. Illoul
Keyword(s):  
High Gain ◽  
Lyapunov Theory ◽  
Continuous Stirred Tank Reactor ◽  
Nonlinear Observers ◽  
Robust Observer ◽  
Fault Reconstruction ◽  
Concentration Estimation ◽  
Continuous Stirred Tank ◽  
The Stability ◽  
Twisting Algorithm

AbstractThis paper deals with the problem of simultaneous concentration and faults estimations of a continuous stirred tank reactor (CSTR) subject to unknown inputs. We propose a combination of two robust nonlinear observers for state estimation and fault reconstruction without any use of a linear approximation of the CSTR dynamic model. Based on the high-gain observer, the proposed scheme can guarantee the asymptotic estimation of the concentration inside the reactor, while, a robust term is added to the nominal plant on the basis of the super-twisting algorithm for fault reconstruction. The stability analysis is proved mathematically using the Lyapunov theory. The effectiveness and robustness of the proposed scheme are illustrated via simulations.

scholarly journals Field-Weakening Nonlinear Control of a Separately Excited DC Motor

2007 ◽  
Vol 2007 ◽  
pp. 1-22 ◽  
Author(s):  
Mohamed Zribi ◽  
Adel Al-Zamel
Keyword(s):  
Nonlinear Control ◽  
Feedback Linearization ◽  
Motor System ◽  
Dc Motor ◽  
Lyapunov Theory ◽  
Power Module ◽  
Field Weakening ◽  
System A ◽  
The Stability ◽  
Controller Board

This paper investigates the design and implementation of nonlinear control schemes for a separately excited DC motor operating in the field-weakening region. A feedback linearization controller, a Corless-Leitman-type controller, and two nonlinear controllers are designed and implemented for a DC motor system. The stability of the closed-loop system is proved using Lyapunov theory. A hardware testbed is constructed to experimentally verify the designed controllers. The hardware consists of a DC motor system, a DSP controller board, a power module, two current sensors, and a tachogenerator. The experimental results indicate that the developed controllers work well.

scholarly journals Sensorless Speed and Reactive Power Control of a Double-Feed Induction Generator using Adaptive Observer in Wind Turbine Power Plant

2018 ◽  
Vol 3 (2) ◽  
pp. 54-64
Author(s):  
NOUREDDINE BOUMALHA ◽  
DJILLALI KOUCHIH ◽  
MOHAMED SEGHIR BOUCHERIT
Keyword(s):  
Power Control ◽  
Wind Turbine ◽  
Reactive Power ◽  
Lyapunov Theory ◽  
Adaptive Observer ◽  
Induction Generator ◽  
Reactive Power Control ◽  
Wind Turbine System ◽  
Doubly Fed ◽  
The Stability

This work presents a new method for the synthesis of a sensorless speed and reactive power control applied to a wind turbine system based to a Doubly Fed Induction Generator (DFIG). The proposed method based on adaptive observers: The rotor speed is adapted using adaptation mechanisms. Stability analysis based on Lyapunov theory is used to guarantee the stability of the observer. To verify the consistency of the proposed approach. We will be interested in the study of vector control based on the synthesis of classical controllers. Simulation results provided with the MATLAB/SIMULINK environment show the consistency of the proposed approaches.

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