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The grid-tied low voltage photovoltaics are expanded day by day. Aiming for a high penetration level, the Fault Ride Through Capability (FRTC) standard should be extended to these units as well. In this paper, the behavior of Single Phase Grid Connected PV Systems under faulty conditions is investigated. For this purpose, a SPWM controlled full bridge voltage source inverter is used. The proposed...
The importance of energy storage technologies is being recognised by more and more power system professionals lately. If properly designed, installed and operated, storage can provide flexibility, and be a valuable component of future electricity networks. Although regulatory and market conditions still have to be improved, the potential of energy storage is unequivocal. As power companies are seeking...
In this paper, the switching flow-graph models are developed to study the nonlinear behavior of DC-DC switching converters. Based on the concept of virtual switches and virtual switching functions, switching flow-graph (SFG) model are created easily without complex mathematics. The SFG modeling technique is helpful for undergraduate students or beginners to understand how the switching converters...
This paper summarizes electro-thermal coupled analysis modeling methods. Two models of influence of temperature-dependent materials on mathematical modelling are presented together with two modelling methods of heat transmission through the air gap. Mathematical models are compared with measurement accomplished on an induction machine available on the market.
This paper presents a self-tuning adaptive control structure designed through the minimization of a criteria function. It is described the computation methodology of the control law, being particularized for the case of a dual winding induction generator's excitation control. The parameter's estimator, integrated into the control system, is based on the online least mean square error algorithm. In...
This paper describes small-signal analysis of a photovoltaic boost converter with an emulated load controller and a resistive load. The simulation results of the derived model are compared to time-domain large-signal simulation results for verification. This analysis helps select the time interval between iterations of Perturb and Observe algorithm. It was found that output voltage takes longer time...
In this paper, we will look into a typical discrete dynamic model of common types of collective behaviors. Collective learning behavior of human group with interactions is first modelled according to the classical herding theory in psychology, and then the model is constructed and simulated based on the cellular automaton (CA) method. In our method, we assume that individuals learn to make their decisions...
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