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Sahazati Md. Rozali
Universiti Teknikal Malaysia Melaka
Computer Science & IT

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Squirrel cage induction motor scalar control constant V/F analysis K. A. M. Annuar; M. R. Sapiee; Rozilawati M. Nor; M. S. M. Azali; M. B. N. Shah; Sahazati Md. Rozali
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 1: February 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i1.8818

Abstract

In constant V/f control technique it is assume that the stator resistance and leakage inductance drops are negligible, especially at high speed and small load. In other words, the back emf is comparatively large at high speed and hence these voltage drops can be neglected. By maintaining constant V/f, constant Eg/f and hence constant air-gap flux is assumed. This assumption is however invalid at low speeds since a significant voltage drop appears across the stator impedance. The terminal voltage, V no longer approximates  ag. By using MATLAB Simulink, the open-loop constant V/f is simulated. It is shown that the performance of the drive deteriorates at low speeds. The improvement in the performance by applying voltage boost is shown and discussed.
Review on load frequency control for power system stability Muhammad Nizam Kamarudin; Nabilah Shaharudin; Noor Haqkimi Abd Rahman; Mohd Hendra Hairi; Sahazati Md. Rozali; Tole Sutikno
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 2: April 2021
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v19i2.16118

Abstract

Power system stability is the capability of power systems to maintain load magnitude within specified limits under steady state conditions in electrical power transmission. In modern days, the electrical power systems have grown in terms of complexity due to increasing interconnected power line exchange. For that, an inherent of controllers were essential to correct the deviation in the presence of external disturbances. This paper hence aims to review the basic concepts of power system stability in load frequency control. Various control techniques were analyzed and presented. Power system stability can be classified in terms of method to improve power system stability, which are rotor angle stability, frequency stability and voltage stability. It is found that each method has different purpose and focus on solving different types of problem occurred. It is hoped that this study can contribute to clarify the different types of power system stability in terms of where it occurs, and which is the best method based on different situation.
Co-Authors K. A. M. Annuar M. B. N. Shah M. R. Sapiee M. S. M. Azali Mohd Hendra Hairi Muhammad Nizam Kamarudin Nabilah Shaharudin Noor Haqkimi Abd Rahman Rozilawati M. Nor Tole Sutikno