Analysis and Assessment of Flicker in Electric Power Systems

Öz

Among various power quality disturbances encountered in electrical distribution networks, flicker—caused by rapid load variations—stands out as a critical parameter that adversely affects both user comfort and equipment lifetime. This study investigates flicker phenomena in the regional network of Dicle Elektrik, covering Diyarbakır and Şanlıurfa, provinces. Real-time measurements were taken from different transformer stations and evaluated in accordance with IEC 61000-3-3 standards using signal processing and time-series analysis techniques. Parameters such as long-term flicker severity (Plt) were calculated to identify the magnitude and sources of flicker. Additionally, international planning levels were compared using national data. Once prepared for further analysis, the obtained data will facilitate a deeper understanding of the origins of flicker events and assist in developing new solutions to improve power quality management. In conclusion, this thesis expands the knowledge base on flicker analysis in distribution networks, emphasising the importance of flicker detection to ensure the reliability and quality of power distribution systems.

Anahtar Kelimeler

• Distribution Network
• Flicker
• Power Quality

Elektrik Enerjisi Sistemlerinde Flicker Analizi ve Değerlendirilmesi

Öz

Güç kalitesi problemleri, modern elektrik dağıtım şebekelerinde hem kullanıcı memnuniyetini hem de cihaz güvenliğini tehdit eden önemli teknik sorunlar arasında yer almaktadır. Bu sorunlardan biri olan flicker, ani yük değişimlerinden kaynaklanan gerilim dalgalanmaları olarak tanımlanır ve özellikle aydınlatma sistemlerinde gözle algılanabilir titreşimlere neden olur. Bu çalışmada, Dicle Elektrik Dağıtım A.Ş.'nin hizmet verdiği Diyarbakır, ve Şanlıurfa bölgelerinde farklı trafo merkezlerinden toplanan flicker verileri analiz edilmiştir. IEC 61000-3-3 standardına uygun olarak yapılan değerlendirmelerde Plt seviyeleri hesaplanmış, flicker kaynakları ve etkileyen faktörler belirlenmiştir. Ayrıca ülkeler bazında flicker limit değerleri incelenerek ulusal düzeydeki standartlarla karşılaştırma yapılmıştır. Elde edilen veriler, daha ileri analizler için uygun hale getirilerek flicker olaylarının kökenlerine dair derinlemesine bir anlayışa ulaşmayı mümkün kılacak, aynı zamanda güç kalitesi yönetimini iyileştirecek yeni çözümler üretmeye yardımcı olacaktır. Sonuç olarak, bu tez çalışması, dağıtım şebekelerinde flicker analizi konusundaki bilgi birikimine katkıda bulunmakta ve flicker tespitinin önemini vurgulayarak, güç dağıtım sistemlerinin güvenilirliği ve kalitesinin korunmasını sağlayacaktır.

Anahtar Kelimeler

• Elektrik Dağıtımı
• Flicker
• Güç Kalitesi

Kaynakça

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