Voltage Stability Assessment by Using Local Bus Parameters

Year 2020, , 757 - 770, 01.12.2020

Enes Talha Gümüş , Selim Meriç , Mustafa Turan , Mehmet Ali Yalçın

https://doi.org/10.36306/konjes.712634

Abstract

In this study, in order to determine critical values of a load bus with respect to voltage stability, two different estimation approaches using local measurements of voltage (V), current (I) and phase angle (φ) on the relevant bus are investigated. First, Thevenin equivalent circuit parameters of the power system is estimated from local bus measurements; then, the critical voltage and voltage stability margin values required for evaluation of the voltage stability are calculated. The proposed approach has been tested on the IEEE 30 bus test system. In IEEE 30 standard test system, the data of the buses to be analyzed was acquired by setting up a power flow with MATPOWER software. The simulation results show that both approaches have successfully determined the voltage stability limits on the load buses and they can be used to evaluate the loading levels of the buses in terms of voltage stability, to determine the critical buses and to prioritize the load shedding operations.

Keywords

Voltage stability, Thevenin equivalent, Voltage stability margin

YÜK BARASI ÖLÇÜMLERİNE DAYALI GERİLİM KARARLILIĞI DEĞERLENDİRMESİ

Abstract

Bu çalışmada, gerilim kararlılığı açısından bir yük barasındaki kritik değerlerin belirlenmesi için, ilgili baraya ait gerilim (V), yük akımı (I) ve güç açışı (φ) yerel ölçümlerini kullanarak kestirim yapan iki farklı yaklaşım irdelenmiştir. İlk olarak, yerel bara ölçümlerinden güç sisteminin Thevenin eşdeğer devre parametreleri kestirilmiş, ardından gerilim kararlılığının değerlendirilmesi için gerekli kritik gerilim ve gerilim kararlılık marjini değerleri hesaplanmıştır. Sunulan yaklaşım IEEE 30 baralı test sistemi üzerinde denenmiştir. IEEE 30 baralı standart test sisteminde MATPOWER yazılımı ile güç akışı yapılarak incelenecek baralara ait veriler elde edilmiş ve her iki yöntem ile gerilim kararlılığı değerlendirmesi gerçeklenmiştir. Benzetim sonuçları, iki yaklaşımında yük baralarındaki gerilim kararlılık sınırlarını başarı ile belirlediği ve baraların gerilim kararlılığı açısından yüklenme düzeylerinin değerlendirilmesinde, kritik baraların tespitinde ve yük atma işlemlerinin önceliklenmesinde kullanılabileceğini göstermiştir.

Keywords

Gerilim kararlılığı, Thevenin eşdeğeri, Gerilim kararlılığı marjini

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