Wyniki wyszukiwania - BazTech

1

Designing of power system stabilizer based on the root locus method with lead-lag controller and comparing it with PI controller in multi-machine power system

Jalali S., Shahgholian G.

Journal of Power Technologies

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2018

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Vol. 98, nr 1

45--56

EN

This paper presents a method for designing a multi-machine power system stabilizer. The conventional design technique using a single machine infinite bus approximation involves a frequency response estimation called GEP(s). Frequency response is estimated between the input AVR and electrical output torque. The power system stabilizer is designed by frequency response and based on the root locus method to improve the damping of oscillatory modes. By using this method, we can adjust the structure of the PSS compensator and its parameters in the multi-machine system and it does not need to know the equivalent reactance of output and voltage of the infinite bus or the other estimations in every machine. In the proposed method, information available at the high voltage bus of the step-up transformer is used to set up a modified Heffron-Phillips model. Finally, this method is examined on three test systems. Simulation results indicate the performance and effectiveness of the proposed method.

2

Application of a nonlinear hybrid controller in multi-machine power system based on a power system stabilizer

Ahmadi-Zebarjad M., Shahgholian G.

Journal of Power Technologies

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2017

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Vol. 97, nr 4

295--301

EN

The power system stabilizer (PSS) is used to generate supplementary control signals for the excitation system in order to dampen low frequency oscillations. This paper presents an approach to designing a hybrid power system stabilizer (HPSS), which is a parallel combination of a conventional PSS and a nonlinear control system, to enhance transient stability for multimachine power systems. The effectiveness and applicability of the proposed approach are examined using a standard multimachine power system. The nonlinear system simulation results show that the HPSS is more effective than the conventional PSS in damping oscillations.

3

Performance Improvement of Permanent Magnet Linear Synchronous Motor Drive using Space Vector Modulated-Direct Thrust Force Control

Faiz J., Manoochehry M., Shahgholian G.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 11

239-244

EN

This paper proposes a space vector modulation (SVM) direct thrust force control (DFC) concept to minimize the ripples of the electromagnetic thrust force and flux-linkage, and fix the switching frequency in a conventional DFC system for permanent magnet linear synchronous motors. A special method called symmetrical SVM is applied to achieve a high performance drive. Simulation results show that the proposed SVM-DFC can improve the steady-state performance considerably while keeping the dynamic performance of the conventional DFC.

PL

W artykule zaproponowano wykorzystanie modulacji wektora przestrzennego SVM i bezpośrednie sterowanie siłą ciągu DFC do minimalizacji zafalowań siły ciągu w synchronicznym silniku z magnesami trwałymi. Rezuyltaty symulacji pokazały że zaproponowany system SVMDFC pozwla na poprawę właściwości silnika w stanie ustalonym przy właściwościach dynamicznych nie gorszych niż w układach konwencjonalnych.