DC Raylı sistem trafo merkezlerinde geçici olayların analizi ve PLL tabanlı dinamik voltaj düzenleyici uygulaması

Öz

Yıldırımlar, kısa devreler, arızalar ve anahtarlamalar güç sistemlerinde geçici olayların oluşumuna neden olmaktadır. Anlık oluşan bu durum akım veya gerilimde genlik değerininin yükselmesine veya düşmesine sebep olmaktadır. Elektrik güç sistemleri için kararlılık çok kritiktir. Bu yüzden güç sistemlerinde oluşan bu geçici durumların analiz edilerek gerekli tedbirlerin alınması gerekmektedir. Raylı sistemler için işletme sürekliliği kritik bir öneme sahip olduğu için işletmenin durmaması için bu tip elektriksel geçici durumlar özellikle dikkate alınmalıdır. Bu çalışmada DC beslemeli raylı sistem trafo merkezlerinde bulunan orta gerilim sistemlerinde oluşabilecek geçici rejimlerin analizi ve bu durumun dinamik voltaj düzenleyici uygulaması ile ortadan kaldırılması araştırılmıştır. Orta gerilim sisteminde gerçekleşebilecek kısa devre arıza durumu ve gerilim yükselmesi durumları incelenmiştir. Voltaj düzenleyici devresi için IGBT’lerden oluşturulan güç elektroniği devresi kullanılmıştır. Geçici rejimlerin oluşturduğu etki ve voltaj düzenleyici devresinin sisteme bağlanmasından sonraki duruma ait benzetim yapılarak sağlanan iyileştirme durumu ortaya konulmuştur. Yüke uygulanan gerilimin genliği, kaynak geriliminin genliğiyle aynı seviyeye getirilmiştir.

Anahtar Kelimeler

• Dinamik
• Düzenleyici
• Gerilim
• Raylı
• Trafo

Analysis of transient events in DC rail system substations and application of PLL based dynamic voltage regulator

Öz

Short circuits, lightning, faults and switching cause transient cases in power systems. This Instantaneous situation give rise to change in the amplitude of the current and the voltage. Voltage regularity is critical in electrical power systems. Therefore this transient cases should be considered and analyzed for the prevention of these events. This kind of electrical transient events are especially must be studied because of the importance of the operation continuity in railway systems. In this study, transient analysis of medium voltage systems in DC rail system substations with a solution by dynamic voltage regulator application is researched. Medium voltage short circuit fault case and voltage swell are examined. Power electronic circuit with IGBT’s is used for the voltage regulation circuit. Transient voltage and the electrical situation after the connection of the dynamic voltage regulator to the circuit are simulated and the results given with the restoration. Load voltage amplitude is leveled with the source voltage amplitude.

Anahtar Kelimeler

• Dynamic
• Rail
• Regulator
• Transformator
• Voltage

Kaynakça

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