Browsing by Author "Mamizadeh, Ali"

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Analysis of Passive Filters for Pv Inverters Under Variable Irradiances
(Ieee, 2019) Karaca, Muhammet; Mamizadeh, Ali; Genc, Naci; Sular, Adem
In this study, passive filters used for photovoltaic (PV) inverters producing different values of power under variable irradiation were analyzed. The use of passive filters is essential to obtain a sinusoidal output voltage with a low harmonic content at the output of PV inverters. For this reason, L-type, L-C and L-C-L type passive filters were designed for PV inverters operating with Maximum Power Point Tracking (MPPT) and Total Harmonic Distortion (THD) analyzes were performed under the same conditions. In addition, the behavior of these filters in PV inverters operating at different irradiations and therefore at different power ratings was observed and compared. In the study, Perturb and Observation (P&O) MPPT technique is used for PV inverter and classical PI controller is used for output voltage control. After the related design studies, the whole circuit with a rated power of 1kW was simulated in the Matlab/Simulink program and the results were compared.
Planar Flyback Transformer Design for Pv Powered Led Illumination
(int Journal Renewable Energy Research, 2021) Mamizadeh, Ali; Mustafa, Bestoon Ahmed; Genc, Naci
Solar standalone LED lighting is becoming increasingly popular due to their economical, sustainability, simplicity and the low number of components. Designing of low volume and low weight driver decreases the price of LED drivers. Since the flyback converter has a low number of components, it is one of the most popular topologies for LED applications. The most important part of a flyback transformer or an inductor is the core. For the magnetic components, operation at high frequencies increases conductor losses due to skin and proximity effects. The use of planar transformers on printed circuit boards (PCB) can be an alleviate to this problem. With larger surface areas, planar transformers also provide better thermal performance than traditional wire-wound magnetic cores. Planar windings have different configurations. Optimal designing of core and winding reduce the losses of the transformer and inductors effectively. Therefore, this paper presents the design of a flyback planar transformer (PT) for photovoltaic (PV) powered LED illumination. The essential equations for designing of flyback PT are introduced and evaluated. The designed flyback PT was used in 50 W LED illumination driver powered by PV panel with a battery. In the proposed driver which was simulated by using MATLAB/Simulink program, the battery is charged via PV powered boost topology with Perturb Observation (P&O) MPPT method and an insulated H-bridge DC/DC converter.
Pv Power Based Duty Cycle Control of Quasi-Resonant Inverter for Induction Cooking
(Ieee, 2019) Sular, Adem; Mamizadeh, Ali; Genc, Naci; Karaca, Muhammet
In this study, photovoltaic (PV) power-based duty-cycle control is recommended for induction cooking (IC) topologies. The output power of the PV panels changes due to the change in solar irradiation. Based on this PV output power, variable duty-cycle control is recommended for single-switch quasi resonant inverter which is often used for IC applications. In the study, the output power is controlled by using the PV power value produced by MPPT to control the duty-cycle rate of the switch of the resonant inverter according to the variable input power, depending on the variable solar intensity and keeping the temperature and frequency constant. Thus, a quasi-resonant inverter is proposed which adjusts its own power increase or decrease according to the power change in the PV panel. This results in the batteries to be used in the system are allowed to have a longer life and constitute a significant financial gain. PV-powered single-switch quasi resonant inverter circuit with a rated power of 2kW was modeled in Matlab/Simulink environment and the results were presented.