During the last decades, thanks to supportive policies of countries and a decrease in installation costs, total installed capacity of wind power has increased rapidly all around the world. The uncertain and variable nature of wind power has been a problem for transmission system operators and wind power plant owners. To solve this problem, numerous wind power forecast systems have been developed. Unfortunately none of them can obtain absolutely accurate forecasts yet. Thus, researchers assumed that wind power generation is a stochastic process and they proposed a stochastic programming approach to solve problems arising from the uncertainty of wind power. It is well known that representing stochastic process by possible scenarios is a major issue in the stochastic programming approach. Large numbers of scenarios can represent a stochastic process accurately, but it is not easy to solve a stochastic problem that contains a large number of scenarios. For this reason scenario reduction methods have been introduced. Finally, the quality of this reduced scenario set must be at an acceptable level to use them in calculations. All of these reasons have encouraged authors to develop a wind power scenario tool that can generate and reduce the scenario set and test the quality of it. The developed tool uses historical data to model wind forecast errors. Scenarios are generated around 24 day-ahead point wind power forecasts. A fast forward reduction algorithm is used to reduce the scenario set. Two metrics are proposed to assess the quality of the reduced scenario set. Site measurements are used to test the developed wind power scenario tool. Results showed that the tool can generate and reduce the scenario set successfully and the proposed metrics are useful to assess the quality.

Dobro je poznato da se usporedno aktivni filtar snage (SAPF - Shunt Active Power Filter) uvelike koristi za smanjenje harmonijske distorzije i kompenzaciju reaktivne snage u elektroenergetskim sustavima. Regulator napona sabirnice...

Elektrik enerjisinin üretim-tüketim dengesinin korunması, değişik yük taleplerinin karşılanması veya sistemde meydana gelebilecek geçici ve kalıcı arızaların elimine edilmesi oldukça önemlidir. Yaşam kalitesini artırmak için geliştirilen yeni cihazların dengesiz güç tüketimleri ve sürekli artan enerji ihtiyacı elektrik güç sistemlerinin enerji kalitesini, şebeke verimini ve enerji verimini düşürmektedir. Giderek karmaşık hale gelen elektrik şebekelerindeki başlıca problemler; aktif-reaktif güç dengesizlikleri, harmonikler, gerilim dengesizlikleri, geçici ve kalıcı arızalar olarak sıralanabilir. Bu çalışmada yaklaşık olarak 20 MW kurulu güce sahip olan bir dal-budak elektrik şebekesi aktif-reaktif güç dengesi ve gerilim kalitesi analiz edilerek şebekede meydana gelen güç dengesizlikleri ve arızalar tespit edilmiştir. Şebekedeki reaktif güç problemini elimine etmek için şebekeye dinamik kontrollü OG ve AG kompanzasyon uygulaması yapılmış ve bu uygulamayla aktif-reaktif güç dengesi, izin verilen yasal sınırlar içinde olacak şekilde ayarlanmıştır. Yapılan dinamik kompanzasyon uygulaması sayesinde şebeke güç oranları belirtilen sınırlar içinde tutulmuş ve gerilimi daha kararlı hale getirilirken güç faktöründe de iyileştirme sağlanmıştır.

It is important to increase the contribution of renewable energy plants in meeting electricity demand in order to decrease global warming. Hydroelectric power plants (HPPs) and solar power plants (SPPs) are two of the most important types of renewable energy plants. SPPs installed on the water surface are called Floating PV (FPV). The decline in water resources has revealed the fact that the ratio of HPPs in energy generation may decrease in the coming years. HPP-FPV hybrid systems have become popular in recent years to reduce water evaporation with FPV and to transport the energy generated from FPV using the HPP’s electricity grid infrastructure. This study focuses on the issue of hybrid utilization of the Menzelet HPP built in Kahramanmaraş and the FPV installed on the reservoir of this HPP. The installed capacity of this FPV has been selected as 124 MW, which is the installed capacity of the Menzelet HPP. FPV was designed using PVsyst software. At the end of the study, it was observed that FPV generated 250.7 GWh of energy annually, prevented the evaporation of 1,515,349 m3 of water and the emission of 151,197.17 tons of CO2, and had a payback period of approximately 3.1 years. It has also been concluded that the installation cost of FPV utilizing with HPP in a hybrid configuration is lower compared to FPV operating independently of HPP.