Software Defined Network (SDN) is a new architecture for network management and its main concept is centralizing network management in the network control level that has an overview of the network and determines the forwarding rules for switches and routers (the data level). Although this centralized control is the main advantage of SDN, it is also a single point of failure. If this main contro...

In this paper, an analytical two-degree-of-freedom-control scheme is proposed for controlling processes with large time delay. The main contributions of this paper are that a setpoint response controller and an H∞ PID load-loop controller are developed based on optimal control theory, and control parameters are derived analytically. This structure can also be used to control integrating or unst...

In this paper, we consider the problem of robust optimization for a system with uncertainty of rank one. The main result is the regularization procedure of the limiting optimal controller. We derive a method to obtain a low order suboptimal controller that provides a stability margin as close to the optimal one as necessary. The method is illustrated by two examples.

The management of irrigation main canals are studied in this research. One way improving is designing an efficient automatic control system the water that flows through canal pools, which usually carried out by PI controllers. However, since pools systems with large time delays and nonlinear hydrodynamics, these PIs tuned a very conservative so closed-loop instability may appear depending on ch...

<span>This paper proposes a control strategy active power filter under non-ideal main voltages. The P-Q Theory is used to generate three-phase reference currents, but the has weakness when implemented non ideal This current generation method using modified voltages conditions. Before calculating Theory, voltage at source normalized by PLL determine phase angle which then carried out gener...

Abstract: In recent years, the increasing penetration level of wind energy into power systems has brought new issues and challenges. One of the main concerns is the issue of dynamic response capability during outer disturbance conditions, especially the fault-tolerance capability during asymmetrical faults. In order to improve the fault-tolerance and dynamic response capability under asymmetric...

in this paper, stabilization conditions and controller design for a class of nonlinear systems are proposed. the proposed method is based on the nonlinear feedback, quadratic lyapunov function and heuristic slack matrices definition. these slack matrices in null products are derived using the properties of the system dynamics. based on the lyapunov stability theorem and sum of squares (sos) dec...

anti-lock braking system (abs) is a nonlinear and time varying system including uncertainty, so it cannot be controlled by classic methods. intelligent methods such as fuzzy controller are used in this area extensively; however traditional fuzzy controller using simple type-1 fuzzy sets may not be robust enough to overcome uncertainties. for this reason an interval type-2 fuzzy controller is de...

---------------------------------------------------------------------***-------------------------------------------------------------------Abstract: – Dynamic voltage restorer (DVR) is the mostly used custom power device for improving power quality indices. The main function of DVR is to mitigate the problems of voltage sag and voltage swells. In this paper, DVR is used to control voltage sag a...