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2 2016

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Multi-machine power system fuzzy stabilizer design using Cuckoo search algorithm

Koochaki A., Skandarnezhad A., Mohammadmoradi Y., Salimi S.

Przegląd Elektrotechniczny

2016

R. 92, nr 3

1--5

Nowadays, fuzzy controllers have achieved an important role in different systems and their superiority over the classical control methods has been proved. In this study, the power system stabilizer is used to damp the power system oscillations based on the fuzzy logic controller. A three-phase to ground-fault test is done during a period of 10 ms to evaluate power system behaviour between the area of two distinct points. Simulation results show that the system is unstable without a stabilizer. It has also been determined that the fuzzy stabilizers have high ability to damp the system oscillations in comparison with classical stabilizers so that system oscillations are damped with higher speed and lower amplitude. Also in this study, the Cuckoo search algorithm is used to optimize the fuzzy stabilizer inputs and improve its performance. The results show that the optimizations of stabilizer parameters improve their damping performance.

W artykule opisano algorytm typu Fuzzy logic wykorzystany do tłłumirnia oscylacji w systemie zasilania.Wykoyowany jest test systemu między dwoma odległymi punktami. W porównaniu z klasycznymi sterownikami zaproponowany sterownik oscylacje tłumione sa szybciej i skuteczniej.

Lagrangian modelling of a synchronous step-down converter by considering the parasitic elements

Skandarnezhad A., Koochaki A., Mohammadmoradi Y., Kalteh A.

Przegląd Elektrotechniczny

2016

R. 92, nr 3

6--10

This paper introduces a new technique to model a synchronous buck converter in the closed loop compensated conditions by Lagrange equation. In the design process of converters it is desirable to assess as many critical design parameters and parasitic effects by simulation as possible, since the control is hard to tune after fabrication. The main advantage of this method is its versatility and simple implementation. In this work, switch conduction loss of an integrated, synchronous buck converter is identified to have significant influence on control loop dynamics. Thus, an equivalent small-signal model for the close loop frequency response accounting for switch conduction loss is developed. Finally, the model is validated against the frequency response obtained by periodic stability analysis which can account for parasitic effects and loading. Very good agreement between the extended model and the simulation results obtained.

W artykule opisano modelowania z wykorzystaniem równań Lagrange synchronicznego przekształtnika typu buck. Straty przełączania są identyfikowane jako wpływające na dynamikę. Analizowano okresową stabilność z uwzględnieniem efektów pasożytniczych.