Saturated fault tolerant control based on partially decoupled unknown‐input observer: a new integrated design strategy

Hashemi, Mojtaba; Egoli, Ali Kamali; Naraghi, Mohammad; Tan, Chee Pin

doi:10.1049/iet-cta.2018.6349

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…Also in practice, the replacement of the actuator is not possible and it is not cost efficient at all the time. To alleviate this circumstance, a substantial amount of works on designing fault-tolerant control protocol are reported in the literature [20][21][22][23][24][25][26][27][28][29]. An observer-based non-fragile control scheme has been addressed for PSs with electric vehicles to guarantee the finite-time boundedness and satisfied H ∞ performance index in [20].…”

Section: Introductionmentioning

confidence: 99%

State estimation and frequency stabilization of multi‐area power systems via fault‐alarm approach

Harshavarthini

Sakthivel

Kumar³

et al. 2021

Asian Journal of Control

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This work is mainly focused on designing hybrid memory state feedback load frequency control law for a class of multi-area power systems against transmission delays, parameter uncertainties, actuator faults, and load disturbances via fault-alarm approach. More specifically, the load disturbances are prompted by the incorporation of abundance amount of renewable energy resources, namely, photo voltaic and wind power. Additionally, the power system takes the effect of actuator faults into account, which is unavoidable and exists at any instant of time. Thus, to stabilize the addressed system, the fault-alarm approach is exploited to develop the hybrid control law. Particularly, the state dynamics are well estimated by the aid of residual observer to detect the faulty condition of actuators. Also, by following the algorithm of fault detection, the spontaneous alert from the alarm is accomplished. Further, in consideration of appropriate Lyapunov-Krasovskii functional, the stability conditions having linear matrix inequality form are derived and which affirms the asymptotic stability of the power systems. Precisely, the controller gain matrices are obtained by solving the developed sufficient conditions. Eventually, the simulation results of two-area interconnected power systems are presented to examine the applicability and advantage of the proposed theoretical result. KEYWORDS fault-alarm-based hybrid control, multi-area power systems, transmission delays and uncertainties

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Section: Introductionmentioning

confidence: 99%

State estimation and frequency stabilization of multi‐area power systems via fault‐alarm approach

Harshavarthini

Sakthivel

Kumar³

et al. 2021

Asian Journal of Control

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show abstract

“…Thence, several actuator and sensor failure estimation algorithms have been developed. Actuator fault estimation is performed based on the UIO model, which is designed using the Lyapunov analysis and the linear matrix inequality (LMI) optimization algorithm to determine observer gain [28][29][30][31][32][33][34][35][36][37][38]. In [29], a UIO model is implemented utilizing Bayesian filter equations and estimates the states in two steps: time update and measurement update.…”

Section: Introductionmentioning

confidence: 99%

“…In [29], a UIO model is implemented utilizing Bayesian filter equations and estimates the states in two steps: time update and measurement update. In [30,31], the FTC scheme applied fault estimation (FE) to a system involving unknown input, uncertainty, bounded disturbance, and additive faults. Here, the FE and FTC schemes are integrated to ensure the stability of the closed-loop system affected by gain factors.…”

Section: Introductionmentioning

confidence: 99%

Robust Control Optimization Based on Actuator Fault and Sensor Fault Compensation for Mini Motion Package Electro-Hydraulic Actuator

2021

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In recent years, electro-hydraulic systems have been widely used in many industries and have attracted research attention because of their outstanding characteristics such as power, accuracy, efficiency, and ease of maintenance. However, such systems face serious problems caused simultaneously by disturbances, internal leakage fault, sensor fault, and dynamic uncertain equation components, which make the system unstable and unsafe. Therefore, in this paper, we focus on the estimation of system fault and uncertainties with the aid of advanced fault compensation techniques. First, we design a sliding mode observer using the Lyapunov algorithm to estimate actuator faults that produce not only internal leakage fault but also disturbances or unknown input uncertainties. These faults occur under the effect of payload variations and unknown friction nonlinearities. Second, Lyapunov analysis-based unknown input observer model is designed to estimate sensor faults arising from sensor noises and faults. Third, to minimize the estimated faults, a combination of actuator and sensor compensation fault is proposed, in which the compensation process is performed due to the difference between the output signal and its estimation. Finally, the numerical simulations are performed to demonstrate the effectiveness of the proposed method obtained under various faulty scenarios. The simulation results show that the efficiency of the proposed solution is better than the traditional PID controller and the sensor fault compensation method, despite the influence of noises.

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“…The problems of optimal estimation for linear discrete‐time stochastic systems subjected to unknown input have drawn increasing attention in the past several decades because of its many useful applications such as fault reconstruction and diagnosis [1, 2], fault tolerant control [3], real‐time monitoring [4], multi‐sensor fusion [5] and so on.…”

Section: Introductionmentioning

confidence: 99%

Equivalence of recursive three‐step filter and infinity augmented Kalman filter for linear discrete‐time stochastic systems with direct feedthrough

Ding

Zhang

2020

IET Control Theory & Appl

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Saturated fault tolerant control based on partially decoupled unknown‐input observer: a new integrated design strategy

Cited by 14 publications

References 33 publications

State estimation and frequency stabilization of multi‐area power systems via fault‐alarm approach

State estimation and frequency stabilization of multi‐area power systems via fault‐alarm approach

Robust Control Optimization Based on Actuator Fault and Sensor Fault Compensation for Mini Motion Package Electro-Hydraulic Actuator

Equivalence of recursive three‐step filter and infinity augmented Kalman filter for linear discrete‐time stochastic systems with direct feedthrough

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