Browsing by Author "Adak, Suleyman"

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Control Strategy Evaluation for Reactive Power Management in Grid-Connected Photovoltaic Systems Under Varying Solar Conditions
(Nature Portfolio, 2025) Adak, Suleyman
Solar energy is environmentally friendly and one of the most significant renewable energy sources. This energy is a leading renewable energy source, contributing significantly to sustainable development goals. In grid-connected photovoltaic (PV) systems, reactive power management is essential for maintaining voltage stability and ensuring reliable operation. However, the influence of fluctuating solar irradiation (G) on reactive power (Q) behavior is often underrepresented in conventional inverter control strategies. This research addresses this gap by modeling the dependence of reactive power on solar irradiance using a data-driven curve-fitting approach. The methodology involves the acquisition of real-world operational data, preprocessing, selection of an appropriate analytical model, and validation of its performance. The findings indicate that reactive power increases under low irradiance conditions, primarily due to inverter behavior and grid voltage support requirements. The resulting analytical expression offers a practical framework for integrating irradiance-dependent reactive power control into inverter firmware or grid management software. The model performed with high accuracy with an R2 of 0.9955. This contribution enhances the ability of PV systems to respond dynamically to environmental changes, improving grid compatibility, operational efficiency, and voltage regulation in modern distributed energy networks.
Citation - WoS: 26
Citation - Scopus: 27
Developed Analytical Expression for Current Harmonic Distortion of the Pv System's Inverter in Relation To the Solar Irradiance and Temperature
(Springer, 2021) Adak, Suleyman; Adak, Süleyman; Cangi, Hasan; Eid, Bilal; Yilmaz, Ahmet Serdar; 17.02. Department of Electricity and Energy / Elektrik ve Enerji Bölümü; 17. Vocational Higher School / Meslek Yüksekokulu; 01. Mardin Artuklu University / Mardin Artuklu Üniversitesi
This paper deals with modeling and simulation of the total harmonic distortion of the current (THDI) dispatched from the inverter and connected to nonlinear load. The change of THD(I)was examined in relation to the ambient temperature (T) and solar irradiance (G). The developed model is being used to extract parameters for a given THD(I)as a function of temperature and solar radiation. This study outlines the working principle of photovoltaic (PV) panel as well as PV array. Off-grid PV system is modeled by using Matlab/Simulink program, and detailed analytical study has been carried out in this work. The design, modeling and simulation of this study are performed from 50 up to 988 W/m(2)for solar irradiance. Harmonic components have negative effects on the steady-voltage stability of the PV system. Therefore, analytical expression is needed for steady-state stability analysis in order to reduce negative effects. Hence, two analytical expressions of THD(I)were obtained by two new different methods which are statistical package for the social sciences program and genetic expression programming. Eventually, two different methods have been verified by the Matlab/Simulink program in order to find out THD(I)and demonstrated the effectiveness of the proposed strategy. As a result of this study, it is observed that input current THDI of nonlinear load is too high at low irradiance. It is suggested that active harmonic filters should be used at low irradiance in order to produce better quality energy and avoid damages in the PV system.
Fotovoltaik Hücre Tek Diyot Eşdeğer Devre Modelinin Parçalı Doğrusal Paralel Dal Modeli Kullanılarak Doğrusallaştırılması ve Dolum Faktörünün Bulunması
(2025) Adak, Suleyman; Adak, Süleyman; 17.02. Department of Electricity and Energy / Elektrik ve Enerji Bölümü; 17. Vocational Higher School / Meslek Yüksekokulu; 01. Mardin Artuklu University / Mardin Artuklu Üniversitesi
Bu makalede Fotovoltaik (PV) hücre tek diyot eşdeğer devre modelinin doğrusallaştırılması ve analizi yapılmıştır. PV hücresi eşdeğer devre modelindeki diyot elemanı doğrusal olmayan bir bileşendir. Doğrusal olmayan PV hücresi tek diyot modeli, parçalı doğrusal paralel dallar modeli kullanılarak doğrusallaştırılmıştır (PLPBM). Ayrıca PV hücresinin maksimum gücü ve doldurma faktörü (FF) eşdeğer devre parametrelerine göre belirlenmiştir. Bu analiz sürecinde Thevenin teoremi kullanıldı. Bu teoremin uygulanabilmesi için devrenin doğrusal bir karakteristiğe sahip olması gerekir. Uygulamada amaç, PV hücresinden maksimum gücü (Pmax) aktarmaktır. PV hücresinin bir diğer önemli parametresi FF'dir. FF, bir güneş PV hücresinin genel davranışını tanımlamak için kullanılır. Bu faktör solar PV hücresinin kalitesini belirlemek için kullanılır. FF, güneş pilinin kalitesi ve verimliliği hakkında bilgi sağlar. Düşük FF durumunda seri direncin değeri yüksek, paralel direncin değeri ise düşüktür. Tipik PV hücresinin FF'rü %50 ile %82 arasında değişir. Makalede yapılan analizde PV güneş pilinin FF %74 olarak bulunmuştur.