The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
When designing a controller in DC Microgrid, normally the communication delay, which may cause system instability, has not been taken into account. In this paper, the effect of communication delay on system stability is studied based on a distributed control strategy. To obtain a less conservative condition for system stability, the delay-dependent stability is analyzed. In the case of time-invariant...
Network-based control system has been an emerging technology in the control and communication fields in recent years. Modulation is a key step to achieve bandpass transmission, especially for the wireless networks. Modulation, an important component in network-based control system, has the detrimental effect on the system performance in some context. In the paper, first, it is shown that the modulation...
The time-delay in state variables can impacts the stability of power system. The problem about stability analysis of linear systems with time-varying delays is concerned. A general criterion of the system asymptotic stability is established by segmenting delay intervals. Corollaries under different conditions are given. The three delay intervals with delay information are segmented finitely based...
When designing a controller in DC Microgrid, normally the communication delay, which may cause system instability, has not been taken into account. In this paper, the effect of communication delay on system stability is studied based on a distributed control strategy, and a novel delay-independent stability criterion for the system with time-varying delays is proposed. To obtain a less conservative...
This paper studies the problem of fault estimation (FE) and the active fault tolerant control (FTC) for a class of Takagi-Sugeno (T-S) fuzzy systems with time-varying delay and simultaneous actuator and sensor faults. Based on the fault estimation algorithm, an adaptive observer-based controller is designed to guarantee the dynamic error system to be asymptotically stable and satisfy the H∞ performance...
In this work, we investigated the sliding mode control (SMC) for uncertain systems with both state and input varying delays. In most existing SMC, a common input and delayed input matrix are considered to apply the conventional method, which is very restrictive assumption. Therefore, we proposed a new sliding surface which takes account of the system state and the control input in order to remove...
Microgrids gathered a lot of attention in the last decade and are believed to be the future power systems. The renewable energy sources can be easily integrated into the Microgrid. Renewable energy sources such as PV, wind and fuel cells are usually connected through voltage-source inverters in the Microgrid. In order to share the same loads, these inverters are connected in parallel and to achieve...
The study of retarded systems have been enticed many researchers due their potential in many practical applications. In this work, a novel DSMC scheme for a linear system with state and input varying delay will be investigated. Using the LMI, the asymptotic stability of the closed loop system can be ensured, and the sliding surface can be designed at the same time. The celebrated cone complementarity...
This paper deals with stability of time delayed Takagi-Sugeno (TS) fuzzy systems. By considering a linear function which bound the derivative of fuzzy weighting functions, a relaxed stability method is established. A new stability approach is derived for time delayed TS systems by using integral Lyapunov function. To show the advantages of the proposed approaches, an illustrative example is given.
This work investigates the problem of state controller synthesis of switched system with time-varying delay. Based on Lyapunov-krasovskii technique and the average dwell time approach (ADTA), a switched state feedback controller is created such that the system is exponentially stable and a weighted La-gain is accomplished. By solving a set of linear matrix inequalities (LMIs), controller parameters...
This paper investigates a secondary frequency control scheme of micro-grid based on synchronization for a network of multi-agent. The networked multi-agent form is presented by a directed graph theory. Delay could occur when interacting with agents. With the consideration of its problem, consensus control with time-delay is considered. To confirm an effect of time-delay on the secondary frequency...
Load frequency control systems used to rely on dedicated communication links. The deregulation of the electricity market and the emergence of the Microgrids and Smartgrids made the open communication infrastructure an exigent need for future power system. In this case the load frequency control signals will be exchanged through communication network. The communication network is characterized by variable...
In this paper, a robust filter is designed using guaranteed cost method to deal with the problem on networked control system (NCS). NCSs are modeled by neutral-type systems with differentiable time-delay uncertainties. The control and gain filter are derived from LMI feasible solution. A numerical example is provided for illustration of the proposed condition.
This paper is concerned with the problem of asymptotical stability for neutral system. The delay variation is divided into two unequal subintervals and some Lyapunov-Krasovskii functionals are defined on the obtained subintervals. The reciprocally convex technique is used to deal with the derivative of the Lyapunov-Krasovskii functionals. Two improved delay-dependent criteria are derived in terms...
This paper investigates the problem of delay-dependent stability analysis for discrete-time systems with interval-like time delays. A multiple summation inequality is first proposed. Based on the summation inequality, a novel Lyapunov functional including the multiple summation terms is constructed to obtain an improved delay-dependent stability criterion, which is a sufficient condition in terms...
This paper addresses the problem of observer-based fault detection for networked control systems (NCSs) with uncertain time-delays and data packet dropouts. The uncertain time-varying delays and packet dropouts of NCSs are modeled as parameter uncertainties of the NCSs and a stochastic variable satisfying Bernoulli distribution, respectively. Combining with the delta operator theory, a new discrete...
An H∞ state feedback control problem for a delayed discrete-time singular system is considered in this paper. The time-varying delay appearing in states is within a known delay interval. Using a modified finite sum inequality approach, we derive a set of LMI-based sufficient conditions for the analysis and controller synthesis problems, respectively. It is expectable that the modified finite sum inequality...
Platoon driving is critical to improve safety, efficiency, and fuel economy. This paper presents a control method for heterogeneous vehicular platoons with uncertain dynamics and uniform communication delay. The requirements of string stability, robustness and tracking performance are measured by H-infinity norm and satisfied by casting into a linear fractional transformation (LFT) format. A delay-dependent...
In this paper, a robust stability analysis approach is proposed for a discrete-time system with time-varying delay. The uncertainty is assumed to be norm-bounded. The developed criterion is terms of Linear Matrix Inequality (LMI) based on Lyapunov-Krasovskii approach. To obtain such criterion matrix variable approach is used. To demonstrate the proposed criterion some examples are considered.
This paper is concerned with stability and control problems of systems with delayed states or delayed inputs respectively. Delay-dependent results for the two problems are derived using an integral quadratic constraint approach. For the stability problem, we consider systems with two independent state delays. For the control problem, we deal with systems with delayed state and delayed input. Conditions...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.