This paper presents a maximum power point tracking (MPPT) algorithm in a solar photovoltaic (SPV) system that requires fewer sensors, is easy to implement, and offers a good tracking efficiency and speed. Among various MPPT algorithms found in literature, the perturb and observe (P&O) algorithm is most popular as it required less complex circuitry and is easy to implement, but it suffers against fast-changing environmental conditions mostly in the case of partial shading conditions and requires two sensors, i.e., voltage and current. This paper presents the one sensor-based method based on the modified converter design which eliminates the effect of partial shading conditions as well as the fast-changing environmental condition. The presented MPPT algorithm was implemented and tested using an FPGA-based NI-sbRIO card interfaced with Labview software.

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A Different Approach for Maximum Power Point Tracking (MPPT) Using Impedance Matching through Non-Isolated DC-DC Converters in Solar Photovoltaic Systems

A novel switched-capacitor and fuzzy logic-based quadratic boost converter with mitigated voltage stress, applicable for DC micro-grid

In this paper, a couple inductor‐based dc‐dc boost converter with extensible capability is presented. In the proposed converter, attaching extensions to input section alleviates input current ripple. Furthermore, the current sharing performance between different phases operates beneficially by expanding optimized boost converters, especially when a partial inequality exists among different switches' duty cycles and leakage inductances. The voltage conversion ratio of the proposed converter is also additionally optimized by a series of VMR's output capacitors. Meanwhile, not only the voltage stress upon the main switches is decreased but also the all switches are managed to be turned on with zero current switching technique. The voltage spikes across MOSFETs are eliminated by using the recycling energy of leakage inductances on the clamp capacitor. The topology of the proposed converter, steady‐state analysis, and design procedure is presented to indicate the merits of the suggested converter. A prototype circuit with a three‐phase interleaved boost converter, two number of diode‐capacitor in each VMR, and output power 660 W and 40–800 V conversion ratio is experimented to corroborate the validity of the presented structure.

Modular DC‐DC converter with reduced current ripple and low voltage stress suitable for high voltage applications

This paper presents a comparison of Isolated (Flyback) and non-Isolated (Buck) multiple input-single output (MISO) DC-DC converters. The analysis of DC-DC converters is based on pulsed voltage source cells (PVSC). The modeling of both converter types is detailed through their mathematical models and electrical simulations using Matlab/Simulink and PSIM. The comparison focuses on the sizing parameters, non-ideal output characteristics and efficiency. Results show that the output voltage of the MISO Buck converter exhibits a linear dependence on the duty cycles control signal and has slightly higher efficiency than the Flyback converter. To validate the operation of both converters, a scenario with two inputs (low-power hydroelectric and photovoltaic voltage sources) is considered. The modeling and control of both source systems are detailed and the MISO converter performance response is evaluated under sources changes and efficiency point of view.

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Multiple Input-Single Output DC-DC Converters Assessment for Low Power Renewable Sources Integration

A Novel Metaheuristic-Based Robust Unified Control Mppt Algorithm for Grid-Connected Pv System

In this study, a switched capacitor (SC)‐based single‐switch DC–DC boost converter structure operating under the high voltage gain and the low duty ratio is proposed using the PI control technique. High current and voltage stresses across the power switches and power diodes can be reduced by using the projected SC block. In addition, the proposed converter can achieve high voltage gain through shorter duty cycles, which directly reduces the voltage stress and dynamic losses in the power semiconductors. On the other hand, because the proposed converter includes a single power switch under different output powers and different loads, the control process is simpler than multiswitch structures. With the proposed converter, an output voltage of 10 times greater rather than the input voltage is obtained at 0.57 of the duty cycle. In this study, the fundamental functions of the proposed converter and the controller design steps are analyzed mathematically and tested in MATLAB/SIMULINK environment. As a result of the analysis, it was determined that the proposed topology works with a high performance at high frequency and variable load ranges. To validate the proposed converter and theoretical calculations, a 200‐W prototype was established under a continuous conduction mode (CCM) working state, with 48‐VDC input voltage and 400‐VDC output voltage. Finally, the simulation results were tested and verified through the experimental results.

A design for switched capacitor and single‐switch DC–DC boost converter by a small signal‐based PI controller

Fotovoltaik paneller icin esas problemlerden biri de voltajin sinirli degerlerde uretilmesidir. Şebeke uygulamalari icin bu DC voltajini arttirmak icin, yuksek voltaj kazancli, trafosuz, dusuk voltaj stresi ve verimli DC-DC yukseltici donusturuculer kullanilir.Esas olan, basit kontrol yaklasimlari ile PV dizisinin gerilimini veya dizinin maksimum guc altindaki yuk degerini degistirerek voltaji donusturucunun cikis uclarinda sabit tutmaktir.Bu yaklasim Maksimum Guc Noktasi Izleme (MPPT) olarak bilinir. Bu calisma, Orantili Integral (PI) ve bulanik mantik denetleyici yontemlerine sahip Iki Asamali Anahtarlamali Kapasitor (SC) hucre tabanli boost donusturucu icin kontrol surecini sunar. Guc anahtari uzerinde dusuk voltaj stresleri ve daha yuksek voltaj kazanci saglamak icin geleneksel yukseltici donusturucu yerine iki asamali SC hucre tabanli yukseltici donusturucu kullanilmistir. Onerilen calismada, yukseltici donusturucunun voltaj kazanci ve verimliligi, volt-ikinci denge yontemi ve akim sarj yaklasimlari kullanilarak hesaplanmistir. Karsilastirilan sistemler farkli giris voltajlarinda test edilmistir ve cikis voltaji 200 VDC'ye sabitlenmistir.Sonuclar, donusturucuye uygulanan PI denetleyicisi ile bulanik mantik denetleyicisi algoritmalari arasindaki karsilastirmayi gosterir. Bu makalede MATLAB / SIMULINK yazilimi kullanilmistir. Nihai sonuclar, bulanik mantik denetleyicisinin PI Kontrolu ile karsilastirildiginda daha hizli performansa sahip oldugunu, ancak PI denetleyicisinin giris voltajinin veya cikis yukunun degisim suresinde daha az asma ve asinmaya sahip oldugunu gostermektedir.

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Maximum Power Point Tracking by the Small-Signal-Based PI and Fuzzy Logic Controller Approaches for a Two-stage Switched-Capacitor DC-DC Power Boost Converter; Applicable for Photovoltaic Utilizations

Kübra Bulut

Papers

A design for switched capacitor and single‐switch DC–DC boost converter by a small signal‐based PI controller

A novel switched-capacitor and fuzzy logic-based quadratic boost converter with mitigated voltage stress, applicable for DC micro-grid

Maximum Power Point Tracking by the Small-Signal-Based PI and Fuzzy Logic Controller Approaches for a Two-stage Switched-Capacitor DC-DC Power Boost Converter; Applicable for Photovoltaic Utilizations