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Article
Transient Voltage Stability Enhancement Using Fuzzy Logic Controller Techniques *

Authors: Dr. Majli Nema Hawas ** --- Abdullah Yaseen Abbas **
Journal: IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم ISSN: 18119212 Year: 2012 Volume: 12 Issue: 2 Pages: 16-27
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Abstract: This paper discusses the transient voltage stability of a synchronous generator at its bus in a power system with a detailed transient modeling for the generator after being subjected to a three phase fault, and designing a Takagi-Sugeno first order fuzzy logic controller with center of area defuzzification algorithm as a fuzzy logic controller based exciter to stabilize the terminal voltage and to damp its oscillations so as to keep the generator under balanced working conditions. The proposed exciter can be easily modified by changing the steady state field voltage value to be applied to any other synchronous generator. This paper also used the integral of square error as an indicator of the terminal voltage stability and monitored all of the generator variables specially the rotor angle to see whether the generator will maintain synchronism or not after the occurrence of the fault.


Article
Comparison between Using FLC and Auto-Tuning FLC in Synchronous Generator Transient Voltage Stability Enhancement
مقارنة بين استخدام متحكم المنطق الضبابي وبين متحكم المنطق الضبابي تلقائي التنغيم لتحسين استقرارية الجهد العابر لمولد متزامن

Authors: Majli Nema Hawas --- Abdullah Yaseen Abbas
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 8 Part (A) Engineering Pages: 1474-1482
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper compares between responses of Fuzzy Logic Controller (FLC) based exciter and auto-tuning FLC based exciter. Both of the exciters are simulated separately with synchronous generator connected to infinite bus through a short transmission line. The systems where subjected to three phase fault at the infinite bus, maximum Integral of Square Error (ISE) of generator terminal voltage response and critical clearing time were taken as performance indices of the exciters. The systems then studied under normal operating condition to justify the need of auto-tuning.

هذه الورقة تقارن بين أستجابة محفز معتمد على مسيطر ضبابي وإستجابة محفز معتمد على مسيطر ضبابي ذاتي التنغيم. تم محاكاة كل محفز على حده للسيطرة على الجهد الطرفي العابر للمولد تزامني متصل بعمومي لانهائي خلال خط نقل قصير. أخضع النظام الى إضطراب ثلاثي الطور على العمومي اللانهائي. أستخدم تكامل مربع الخطأ لاستجابة الفولتية الطرفية للمولد وزمن الإزالة الحرج كدلائل لمعرفة الإداء للمحفزات في ظروف العمل المضطربة وتم إثبات الحاجة الى التنغيم الذاتي في ظروف العمل الطبيعية.

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