Fuzzy control is a methodology that transforms control rules (described by an expert in words of a natural language) into a precise control strategy. There exist several versions of this transformation. The main difference between these versions is in how they interpret logical connectives “and” and “or”, i.e., in other words, what reasoning method a version uses. Which of these versions should...

This paper describes the handover mechanism in the standard 802.16e, which has implemented three handover methods  Hard Handover (HHO), Fast Base Station Switching (FBSS) and Macro Diversity Handover (MDHO) at this moment. Moreover, the handoff scheme is presented based on fuzzy logic. The mechanism takes under consideration three criteria: geographical data, received power level and used band...

Variable Structure Control (VSC) has been successfully established in control systems engineering in the past two decades. Recently, Fuzzy Sliding Mode Control (FSMC) techniques have drawn the attention of the scientific community, due to their effectiveness in reducing the typical chattering phenomenon arising in VSC. In this paper we present a novel FSMC technique for a class of second order ...

Fuzzy theory is widely studied and applied. This article introduces an adaptive control scheme for a class of non-linear systems with Markov jump switching. The introduced supposes that the system submitted to external disturbances under imperfect premise matching. By using discrete-time Takagi–Sugeno fuzzy models, sliding mode observer-based utilized estimate unmeasured states system. We build...

The sequencing batch reactor (SBR) is a widely used process for biological removal of nutrients (nitrogen and phosphorus) from wastewater. It is based on the metabolism of specialised bacteria, which under alternate anaerobic/aerobic conditions uptake phosphorus and perform denitrification. Intermittent operation is normally operated on a fixed switching schedule with ample margin for possible ...

The teaching of fuzzy and advanced control strategies at bachelor level is correlated with the usually heuristic means of fuzzy control, incorporating human skills, the drawback being in the lack of general-purpose development methods. A major problem, which follows from the study of advanced control strategies is the understanding of its background the basic development methods and some applic...

This paper presents a new control scheme for three levels NPC Inverter to boost up the input dc voltage and give three levels AC output voltage with less harmonic distortion in a single stage.Recently, Single stage high voltage pick up support inverter is getting ubiquity in applications like sun powered PV, energy component, UPS systems and so on. As of late, single stage voltage support multi...

One view of hybrid control, or multiple objective, behaviour-based control systems is a kind of strategy reconfiguration – an intelligent adaptation of the system to the actual situation. In case of hybrid control it is an actual situation dependent discrete strategy (controller) changing, while in behaviour-based control systems it is a discrete switching to the most appropriate strategy or a ...

this paper presents a novel control method to improve the efficiency of low-voltage dc-dc converters at light loads. pulse width modulation (pwm) converters have poor efficiencies at light loads, while pulse frequency modulation (pfm) control is more efficient for the same cases. switching losses constitute a major portion of the total power loss at light loads. to decrease the switching losses...

The inverters are commonly used for medium power induction heating applications. In the process of induction cooking, a disc of metal is surrounded by a copper coil through which an alternating current is made to flow. The disc has a finite diameter and thickness. It is placed at a given distance from the coil and concentric to it. Secondary current is induced in the disc and this induced curre...