Mohammad Ababneh

Design of digital controllers for uncertain chaotic systems using fuzzy logic

Abstract A new and systematic method to design digital controllers for uncertain chaotic systems with structured uncertainties is presented in this paper. Takagi–Sugeno (TS) fuzzy model is used to model the chaotic dynamic system, while the uncertainties are decomposed such that the uncertain chaotic system can be rewritten as a set of local linear models with an additional disturbed input. Conventional control techniques are utilized to develop the continuous-time controllers first. Then, the digital controllers are obtained as the digital redesign of the continuous-time controllers using the state-matching approach. The performance of the proposed controller design is illustrated through numerical examples.

Simulation and Numerical Analysis of Wireless PSK Systems with Imperfect Carrier Phase Recovery

Abstract The bit error probability (BEP) of binary and quaternary PSK (BPSK and QPSK) signals over Rayleigh fading channel with imperfect carrier-phase recovery is derived. The channel is assumed to be slow and frequency-nonselective in which the received signal is constant over at least two symbol intervals. Numerical values for the average BEP are obtained by integrating the conditional BEP expression over the carrier-phase error distribution. The resultant integrands have only elementary functions, such as exponentials and algebraic power functions and can, therefore, be explicitly evaluated to any degree of accuracy. The accuracy of this approach is verified through proposing an efficient quazi-analytical simulation technique.

Modelling of a new hydro-compressed air-storage system

ABSTRACT The interest in energy storage systems is increasing, since it provides an excellent solution to store the low-cost excess energy from the energy sources, which are available at peak demand hours. This paper presents a new compressed-air storage system that combines ambient air and hydraulic oil, in order to store energy in compressed-air form and benefit from the advantages of both pneumatic and hydraulic systems. The process consists of charging and discharging cycles, however, this paper investigates the discharging cycle, where a new technique of Small-Scale Compressed Air Energy Storage (SS-CAES) system is realised. The new idea in RC-CAHES is to obtain higher efficiency in energy conversion machines during charging and discharging processes with numerous advantages over conventional types of energy storage systems. This study demonstrates the effectiveness of this technique by proving that it has higher efficiency than a similar Compressed Air Energy Storage (CAES) systems.

Design and simulation of a PV-grid connected system

This work presents the design and simulation of 10 kW grid-connected photovoltaic PV systems as feasible power generators for the Hashemite University campus 32.05°N, 36.06°E. The simulation is performed to justify the accuracy and reliability of such design using PV-SOL and Meteonorm simulation software. In the primary simulation runs a set of parameters including the module power, PV-solar panel size, inverter type, global radiation and angle of inclination were used. The results of those runs lead to the final simulation parameters which are used for the 10 kW PV system. This work also presents a comparison between the performances of different PV panel sizes and different inclination angles. The final design of 10-kW PV-system consists of 33 PV panels of 300 W each and three inverters of 3.4 kW each. In order to highlight the economical and ecological effectiveness and the promising potential of the proposed system, a comparison between the costs of one kWh generated by our system with that of the public electricity tariff has been conducted.