HABERLEŞME İÇERMEYEN MİKRO ŞEBEKELER İÇİN DÜŞÜM KONTROL TABANLI ORANTISAL GÜÇ PAYLAŞIM YÖNTEMİ

DC mikro şebekelerinin popülerliği oldukça artsa da yük paylaşımı mikro şebekelerde yaygın kullanımın önüne geçen çözümlenmemiş bir engel teşkil etmektedir. En çok tercih edilen yük paylaşım yöntemlerinden biri olan geleneksel düşüm yöntemi kısmen yük paylaşımını sağlasa da bu hatların eşit direnç değerlerine sahip olmasına bağlıdır. Ayrıca bu sistemin bir diğer dezavantajı ise baralarda oluşan düşüm tabanlı kontrolden kaynaklanan fazladan gerilim düşümüdür. Bu çalışma da DC mikro şebekeleri için orantısal yük paylaşımını haberleşme içermeyen bir şekilde başarı ile sağlayan yeni bir yaklaşım önerilmiştir. Bu yöntem sabit bir gerilim yerine doğrultulmuş sinüzoidal dalga şekline sahip DC gerilimi önermektedir. Bu sayede periyodik bir sinyal üretilerek AC düşüm tabanlı kontrolde olduğu gibi yüklenmeye bağlı olarak sinyalin frekansı düşürülmüştür. Önerilen yöntemi doğrulamak amacı ile geleneksek düşüm yöntemi ile karşılaştırıcı bir benzetim çalışması gerçekleştirilmiştir. Önerilen yöntem sistemin gerilim performansını yaklaşık olarak %5 ve yük paylaşım performansını da %17.10 oranında arttırdığı görülmüştür.

Anahtar Kelimeler:

DC mikro şebeke, düşüm kontrolü, güç yönetimi, yük paylaşımı

A DROOP CONTROL BASED PROPOTIONAL POWER SHARING METHOD FOR DC MICROGRIDS WITHOUT COMMUNICATION

Although DC microgrids are getting popular, load sharing is still an unsolved obstacle for widespread operation. Conventional droop method which is one of the most preferred load sharing method partially manages load sharing however this is related to equal line resistance. Also extra voltage drop arise out of the droop method is another disadvantage of the system. In this study a new approach which achieves proportional load sharing without communication is proposed for DC Microgrids. This method presents a variable DC voltage level like rectified sinusoidal voltage instead of a constant DC Voltage. By this way a periodical signal is generated and frequency of this signal is controlled according to loading level like the AC droop control. A comparative simulation study with conventional droop control is done to verify the proposed method. Results show that proposed method increased the voltage performance of the system nearly %5, load sharing performance %17.10.

Keywords:

DC microgrid, droop control, power management, load sharing,

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