Browsing by Author "Oztura, Hacer Sekerci"

Now showing 1 - 7 of 7

Citation - WoS: 1
Citation - Scopus: 1
24-hour Electricity Consumption Forecasting for Day Ahead Market with Long Short Term Memory Deep Learning Model
(IEEE, 2020) Nalan Ozkurt; Hacer Sekerci Oztura; Cuneyt Guzelis; Guzelis, Cuneyt; Oztura, Hacer Sekerci; Ozkurt, Nalan
In 2015 with the foundation of Energy Market Management Inc. AS (EPIAS) the production and pricing of electrical energy began to be made according to consumption estimates. In this study twenty-four hours energy consumption forecasting was made by using long short-term memory method and data was downloded from EPIAS's official web page for the Day Ahead Market. The data set used covers 1500 days between June 2016 and July 2020. The results obtained have been compared with EPIAS's own estimates and actual consumption data.
Citation - WoS: 1
Citation - Scopus: 1
A day-ahead EMS for transformer aging mitigation in distribution systems via coordinated PV-BESS inverter control under dynamic thermal constraint
(ELSEVIER SCIENCE SA, 2026) Sezai Polat; Emrah Biyik; Hacer Sekerci Oztura; Oztura, Hacer Sekerci; Şekerci Öztura, Hacer; Polat, Sezai; Biyik, Emrah
This paper proposes a novel day-ahead energy management system (EMS) that integrates dynamic thermal rating (DTR) of distribution transformers into the co-optimization of active and reactive power flows from photovoltaic (PV) and battery energy storage systems (BESS). The model comprehensively incorporates inverter and battery degradation costs transformer insulation aging and inverter losses while respecting operational and thermal constraints through both soft and hard constraint formulations. Simulations are performed on a modified IEEE 33-bus distribution system under three operational scenarios. Results demonstrate that aging-related costs can be reduced by up to 78 % through the inclusion of aging cost as a soft constraint and up to 85 % via the enforcement of hard hot-spot temperature (HST) constraints-without the need for transformer or BESS capacity increases. In comparison increasing the BESS capacity from 750 kWh to 1250 kWh yields a 2.4 % decrease in operational cost and 21 % reduction in aging cost. Increasing the transformer capacity from 3000 kVA to 4000 kVA further reduces aging cost by 96 % and operational cost by 5.8 % albeit at significant capital expenditure. The proposed DTR-aware EMS allows for safe transformer operation beyond nominal ratings enabling deferred infrastructure upgrades while maintaining system reliability and economic efficiency.
Citation - WoS: 1
Citation - Scopus: 2
A Symmetrical-Asymmetrical Fault Characteristics Analysis within Cogeneration Power Plant in Izmir Turkey: An Experimental Assessment
(Gazi Univ, 2022) hacer sekerci oztura; sezai polat; Polat, Sezai; Oztura, Hacer Sekerci; Sekerci Oztura, Hacer
The analysis of the short circuit should be understood very well in order to make correct designs in the power systems such as the safety of the personnel and the equipment the selection of the safety relays the circuit breaker selection and the selection of the appropriate conductor section. In this study the parameters about the short circuit and the techniques of calculating the faults in system and the necessary theoretical knowledge for the short circuit fault to be understood better have been given. The effect on the distributed generation and the grid which is caused by the possible short circuit faults have been simulated by being modeled in PSS/Sincal and by using the real grid parameters with cogeneration power plant in Izmir Turkey. The real short circuit fault results measured from the power plant and the grid and the results obtained from the software program have been compared and it has been determined that there is not a significant difference between them. Thus it has been emphasized that it is correct to simulate before investing in a power system in for the purpose of restrain the faults during the designing and working before the application. It allows the designer to design new power plant as good as plan expansion of existing power plants with higher degree of precision. Considering the prices of protection equipment which has a large part in system design this way would allow designer to reduce the cost of the protective equipment and remaining stability.
Isıl Konfor ve Enerji Tüketimi Açısından İki Üniversite Binasının İncelenmesi
(2021) Nurdan Yildirim; hacer sekerci oztura; Şadiye Birce Ongun; Oztura, Hacer Sekerci; Ongun, Şadiye Birce; Yildirim, Nurdan
Binalar ve sanayi toplam enerji tüketiminin en büyük payını kapsamaktadır. Binalardaki enerji tüketiminin dağılımına bakıldığında da en önemli kısmını iklimlendirme sistemlerinin oluşturduğu görülmektedir. Bu nedenle iklimlendirme sistemlerinin enerji tüketimlerinin iyileştirilmesi veya daha verimli sistemlerin kullanılması büyük önem taşımaktadır. İklimlendirme sistemlerinin enerji tüketimlerini etkileyen faktörlerin başında sistem tipi kapasitesi tasarım şekli işletme ve iklim koşulları ve kullanıcı müdahaleleri gelmektedir. Yaşar Üniversitesi 5 Ocak 2016 tarihinde TS EN ISO 50001:2011 Enerji Yönetim Sistem (EnYS) Standardı belgesini ülkemizde alan ilk üniversite olmuştur ve o günden bu yana enerji verimliliği ile ilgili araştırma ve çalışmalar artarak devam etmektedir. Bu kapsamda üniversitemizin kullanım alanı en büyük ve farklı iklimlendirme sistemleri ve tasarımına sahip olan iki binamız enerji verimliliğimizi arttırmak açısından öncelikli olarak ele alınmıştır. Binalarımızın birim kullanım alanına göre enerji performans değerleri hesaplanmış ve bu değerlerin analizinde binalardaki ısıl konfor koşullarının da dikkate alınması gerektiği anlaşılmıştır. Bu nedenle her iki binamızda bazı ofis ve sınıflarda sıcaklık nem CO2 ve basınç gibi ısıl konfor ve iç hava kalitesi parametrelerinin ölçümleri yapılmaya başlanmıştır. Bu çalışmada söz konusu mahallerden alınan ölçüm sonuçları analizörlerden elde edilen enerji tüketim değerleri ve meteorolojik veriler kullanılarak binalarımızdaki iklimlendirme sistemlerimizin birim ısıtma sıcaklığına karşılık enerji tüketim değerleri hesaplanmıştır. Böylelikle binalardaki enerji tüketimi ve ısıl konfor açısından performans göstergeleri ortaya çıkarılarak enerji verimliliğinin arttırılması amacıyla öneriler sunulmuştur.
Model Predictive Control for a 22-Bus Agricultural Microgrid Under ANN and Statistical PV Forecasts
(Institute of Electrical and Electronics Engineers Inc., 2025) Oztura, Hacer Sekerci; Korkut, Irmak Onal; Polat, Sezai; Biyik, Emrah
Citation - WoS: 5
Citation - Scopus: 6
Optimal active and reactive power scheduling for inverter-integrated PV and BESS under inverter current constraints
(ELSEVIER SCIENCE SA, 2025) Sezai Polat; Emrah Biyik; Hacer Sekerci Oztura; Şekerci Öztura, Hacer; Oztura, Hacer Sekerci; Polat, Sezai; Biyik, Emrah
The intermittent nature of renewable energy complicates grid integration requiring an efficient Energy Management System (EMS). This study addresses day-ahead EMS in distribution systems (DS) with a focus on active and reactive power scheduling utilizing the reactive power support of inverters in Photovoltaic (PV) and Battery Energy Storage Systems (BESS). A novel current-based method is proposed accounting for current limits bus voltage inverter lifetime reduction costs and inverter losses modeled as load. This method impacts load flow bus voltage and voltage-dependent loads enabling optimal decisions for compensating inverter losses via the grid BESS or PV. Simulations on the IEEE 33 test system show a 5% reduction in inverter losses with the currentbased method and 6% with the traditional power-based method. Inverter lifetime reduction costs were minimized by 42% and 58% with the current- and power-based methods respectively under summer conditions. In winter reductions reached 49% and 14%. Crucially inverter output depends on bus voltage challenging the assumption of constant rated power. At voltages below 1.00 p.u. inverters underperform achieving only 209 kVA of a 215 kVA rating. These findings emphasize the need for accurate modeling to improve EMS performance and reliability in renewable energy systems.
Sensitivity and Cost Analysis of a Microgrid With a Day-Ahead Energy Management System
(2023) hacer sekerci oztura; sezai polat; EMRAH BIYIK; Polat, Sezai; Oztura, Hacer Sekerci; Bıyık, Emrah
The use of renewable energy sources (RESs) can ensure both lower cost of energy and improvement in voltage levels in the grid. Likewise batteries can help achieve technical improvement and cost reduction. However the full benefits of integrating RESs and batteries into the grid can only be realized by a suit- able energy management system (EMS). In this work a predictive EMS is developed to optimally operate a microgrid (MG) with photovoltaics and batteries while satisfying voltage constraints in the distribution grid. First mathematical models of the MG components are obtained. Then proper load flow method is selected for the network structure. Using component models and the load flow method a day-ahead EMS is posed as an optimization problem. Since the power flow calculations are nonlinear the optimization problem is constructed as a nonlinear program. Simulation studies are performed to analyze the sensitivity of the cost of operation and power loss in the grid with respect to different system parameters. It is confirmed that the purchase price of electricity and the amount of photovoltaic panels were the most effective factors on the daily energy cost.