Reconfiguration of Distribution Systems Using Thevenin Based Voltage Stability Index

Abstract

The optimal operation of distribution systems is of great importance since the distribution systems are ended with consumers. It generates an optimization problem to determine the ideal distribution system reconfiguration, as well as the optimal location and size of distributed generation (DG) facilities so that distribution systems can benefit the most. The optimal solution of the problem plays a significant role in maximizing benefits such as reducing power losses, improving voltage profile, and more stable operation of the system. So, the problem is formulated as a multi-objective optimization problem to decrease power losses, improve voltage profile and increase stability. A voltage stability index based on Thevenin equivalent circuit model has been adapted to improve voltage stability. The multi-objective optimization problem has been solved by using the Slime Mould Optimization algorithm to obtain the optimal location and size of DGs along with the reconfiguration of the radial distribution system. The proposed approach has been tested on IEEE 33 bus test system. By applying the proposed approach to the IEEE 33 bus test system, it has been verified that the power losses are reduced, the voltage profile of the system is improved, and the system becomes more stable. The proposed approach has also been compared with several studies using different optimization techniques and stability indexes. The results show that the proposed approach gives better results than the compared studies in terms of power loss, improvement of voltage profile, and stability.

Keywords

• Distributed Generations (DG)
• Slime mould algorithm (SMA)
• Thevenin-based voltage stability index
• Distribution systems optimization
• Optimal distributed generation placement and sizing

THEVENİN TEMELLİ GERİLİM KARARLILIK İNDEKSİ KULLANILARAK DAĞITIM SİSTEMLERİNİN YENİDEN YAPILANDIRILMASI

Abstract

Dağıtım sistemleri elektrik enerjisinin son tüketiciye ulaştığı sistemler olduğundan, sistemlerin optimal çalışması büyük önem taşımaktadır. Dağıtım sistemlerinin maksimum fayda ile çalışabilmesi; sistemin yeniden yapılandırılması, dağıtık üretim (DÜ) tesislerinin optimal bağlantı noktaları ve boyutlarının belirlenmesi gibi amaçları olan bir optimizasyon problemini ortaya çıkarır. Bu problemin uygun çözümü şebeke kayıplarının azaltılması, gerilim profilinin iyileştirilmesi ve sistemin daha kararlı çalışması gibi faydaların maksimize edilmesinde çok önemli bir rol oynar. Bu amaçla problem; kayıpların azaltılması, gerilim profilinin iyileştirilmesi ve kararlılığın artırılması için çok amaçlı bir optimizasyon problemi olarak modellenmiştir. Gerilim kararlılığını arttırmak için Thevenin eşdeğer devre modeline dayalı bir gerilim kararlılık indeksi uyarlanmıştır. Oluşturulan denklemler cıvık mantar optimizasyon algoritması ile çözülerek, Radyal Dağıtım Sistemi (RDS) yeniden yapılandırılmış ve DÜ tesislerinin bağlantı noktaları ile boyutları belirlenmiştir. Önerilen yaklaşım IEEE 33 baralı test sistemine uygulanarak sistem kayıplarının azaldığı, sistemin bara gerilim değerlerinin arttığı ve sistemin daha kararlı hale geldiği doğrulanmıştır. Önerilen yaklaşım, farklı kararlılık indeksi kullanılarak yapılan optimizasyon çalışmaları ile karşılaştırılmış ve sonuçların diğer yaklaşımlardan daha iyi çıktığı görülmüştür.

Keywords

• Dağıtık üretim (DÜ) tesisleri
• cıvık mantar algoritması (SMA)
• Thevenin temelli gerilim kararlılık indeksi
• Dağıtım sistemleri optimizasyonu
• Optimal Dağıtık üretim yerleşimi ve boyutlandırılması

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