in this study, a novel variable impedance control for a lower-limb rehabilitation robotic system using voltage control strategy is presented. the majority of existing control approaches are based on control torque strategy, which require the knowledge of robot dynamics as well as dynamic of patients. this requires the controller to overcome complex problems such as uncertainties and nonlinearit...

This paper presents robust controller design for a wind-driven induction generator system using structured singular value ( -synthesis) method. The controller was designed for a static synchronous compensator (STATCOM) and a variable blade pitch angle in a wind energy conversion system (WECS) in order to achieve the required voltage and mechanical power control. The results indicated that this ...

This study develops a fuzzy sliding mode controller (FSMC) based on a variable boundary layer. A fuzzy inference mechanism is used to on-line tune the thickness of the boundary layers of the controller. Minimum rule base has been used for the fuzzy inference system which results in low calculation effort. The aim of this paper is to design a controller which will eliminate the chattering of FSM...

This paper discusses a design problem of a variable gain robust controller with guaranteed L 2 gain performance for a class of uncertain switched linear systems. The uncertainties included in the switched linear system under consideration are supposed to satisfy the matching condition and the proposed variable gain robust controller consists of a switching rule, a state feedback law with fixed ...

In this paper, a combined variable structure / genetic algorithms controller is presented to improve the dynamic stability of a power system. The design of variable structure controller is formulated as an optimization problem and genetic algorithms are used in the optimization process. Contrary to the design methods reported in the literature, which depend partially on trial and error approach...

To circumvent performance-limiting trade-offs encountered in the control of linear motion systems, we introduce a method for designing performance-optimal piecewise affine variable-gain feedback controllers. Variable-gain controllers are known to improve upon the performance trade-off between low-frequency tracking on the one hand and sensitivity to high-frequency disturbances on the other hand...

The important and hazardous of the rescue mission in oceans and seas, autonomous vessels now are one of the most appropriate applications among others. Due to safety, reliability, and accessibility of smart, Autonomous and Cooperative vessels today has attracted much attention from the industry. Regard to the complication of the mono vessel for different objects, the multi- agent system was pro...