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A large-scale interconnected system consists of large numbers of coupled subsystems. This coupling gives rise an important problem of integrating the designs of fault estimation (FE) and fault-tolerant control (FTC) in the presence of unexpected faults. This paper proposes an integrated FE/FTC design for large-scale interconnected systems with uncertain nonlinear interactions and unknown bounded actuator...
In this paper, we exploit motion for improving the ultrasound (US) imaging performance of thinned sensor array systems. Thinned arrays provide reduced system cost and allows for the reduction of bulky channel cables. However, thinned array systems suffer from poor array processing performance from the lack of channels available to the system when compared to a Uniform Linear Array (ULA). To overcome...
Reduced external networks supplied with real-time data are employed in this paper to solve the state estimation problem in interconnected systems. We propose a method to obtain a composed single system state of different monitored areas with local estimations and external equivalent models, which neither require the use of a coordination agent nor requires extensive data interchange. Phasor measurement...
This paper presents a decentralized robust adaptive fuzzy design for the fault tolerant control of a class of uncertain nonlinear large-scale systems with an unknown dead-zone. Within this design scheme, fuzzy systems are used to estimate unknown nonlinear functions of the dynamic system and unknown upper bounds of interconnections and unmatched uncertainties, respectively. By means of the Lyapunov...
Locational marginal price (LMP) is a market-pricing method used to determine optimal dispatch of interconnected power systems. In order to take system's operating risk into consideration, a modified risk-based LMP (RLMP) calculation method is given in this paper. We design a risk-based decentralized synergetic dispatch pattern in electricity market environment to avoid the drawbacks of centralized...
Recent trend of research is oriented in different methods of emulating the inertia to increase the sustainability of the system. In the case of dynamic performance of power systems especially in frequency control of interconnected system, there are concerns considering the matter of virtual inertia. This paper proposes a new approach on modeling and analyzing the dynamic performance of the system...
Temperature to frequency converters (TFC) have been used as thermistor signal conditioning circuit (SCC) and linearization. Many TFC have been proposed by the researchers out of which 7555 timer based SCC has been employed in several applications. The application of 7555 timer based SCC demands a method for generating the optimal circuit parameters yielding desired linearity and sensitivity for a...
This paper considers a general approach for the identification of partial differential equation-governed spatially-distributed systems. Spatial discretization virtually divides a system into spatially-interconnected subsystems, which allows to define the identification problem at the subsystem level. Here we focus on such a distributed identification of spatially-interconnected systems with temporal/spatial...
This paper presents a distributed control strategy with situation-dependent communication for disturbance attenuation in physically interconnected systems by output feedback. To avoid large control errors, the local controllers transmit information to the other local controllers, if the influence of the local disturbance on the coupling input to their corresponding subsystem exceeds a given bound...
This paper poses and solves the localized linear quadratic Gaussian (LLQG) optimal control problem. In particular, we show that for large-scale localizable systems, that is to say systems for which the closed loop effect of each disturbance can be contained to within a local neighborhood despite communication delays between sub-controllers, the synthesis and implementation of a LLQG optimal controller...
This paper proposes a general framework for determining the effect of communication delays on the convergence of certain distributed frequency regulation (DFR) protocols for prosumer-based energy systems, where prosumers are serving as balancing areas. DFR relies on iterative and distributed optimization algorithms to obtain an optimal feedback law for frequency regulation. But, it is, in general,...
This paper proposes a non-iterative, Lyapunov-based distributed model predictive control (MPC) design for invariant spatially-interconnected systems comprised of a network of subsystems with coupled dynamcis and subject to local state and/or input constraints. Considered here is the distributed MPC design for linear systems in input-output form with fixed-structure local state-feedback-like control...
The problem of stabilization of large-scale fractional order interconnected system with norm-bounded uncertainties by output feedback control is investigated. On the basis of the stability criterion of fractional order system, sufficient conditions on robust stabilization of large-scale fractional order interconnected system with a commensurate order in both cases of 0 < α < 1 and 1 < α <...
Nonlinear interconnected systems such as complex biological processes and power networks operate using local state information. This is because global network states are generally unavailable, arrive with time-delays, or require expensive infrastructure. Coupled with nonlinear interconnections, state disturbances, and sensor noise/attacks, distributed state estimation is an extremely challenging problem...
This paper focuses on stability of interconnected systems whose connecting channels are exposed to stochastic noises. This class of systems includes interconnected systems whose coupling is brought in only by stochastic noises. Another example is coupling through noisy amplification. This paper shows how to construct Lyapunov functions to verify stability for such a class of systems, and illustrates...
This paper studies the well-posedness, stochastic stability and performance of the spatially interconnected discrete-time Markovian jump time-delay systems. By using the strict linear matrix inequalities (LMIs), a sufficient condition is obtained to guarantee the desired properties, which gives a theoretical foundation for the further research. In addition, the transition of the jumping parameters...
Scaling of Lyapunov functions is one of effective tools in analyzing and designing dynamical systems from components. Integral input-to-state stability and input-to-state stability are notions which allow one to make use of dissipation inequalities in such modular-based analysis with the help of nonlinear gain which may not be globally defined. Effectively selecting nonlinear scalings is crucial for...
This paper studies the problem of the non-fragile decentralized control for a class of discrete-time switched interconnected systems with time delay. By utilizing of the S-procedure lemma and Abel-based finite sum inequality method, a sufficient condition for the asymptotical stability of the switched interconnected time-delay systems is presented. Then, the non-fragile switched decentralized controller...
This paper studies the problem of the finite-time boundedness (FTB) of interconnected neutral switched systems with impulsive behavior. First, a sufficient condition for FTB of interconnected neutral switched systems with impulsive behavior is presented. Then, the decentralized switched control scheme based on state-feedback is constructed such that the trajectory of the closed-loop system stays within...
This paper presents a balanced truncation technique for model and scheduling order-reduction (i.e. reduction of number of states as well as of scheduling parameters) of exponentially stable temporal- and spatial-LPV interconnected systems. The reduction is based on the application of the full block S-procedure, using both Constant Gramians (CGs) and Parameter-Dependent Gramians (PDGs). The reduced...
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