Design and implementation of all-SiC MPPT boost converter for grid connected photovoltaic systems

Koç, Elif Tuğçe
Output power generated by a photovoltaic array is prone to fluctuations during utilization due to varying solar irradiance exposure throughout the day and changes in cell temperature; therefore, maximum power point tracking is essential for overall system efficiency. For this purpose, DC-DC Maximum Power Point Tracker (MPPT) Converters are used in photovoltaic systems connected to the grid in order to extract the available power. SiC semiconductors are favorable new devices that enable greater power conversion efficiency than Si semiconductors; therefore, these devices have become strong candidates in new photovoltaic converter designs. In this thesis, design, implementation and functional testing of a 10 kW All-SiC MPPT Boost Converter is presented. For power conversion efficiency comparisons, the converter was implemented in such a way that the power and control stages could be operated in four different configurations of which are Two-Phase Interleaved Boost Converter, Two-Phase Interleaved Synchronous Boost Converter, Conventional (Single-Phase) Boost Converter, Synchronous (Single-Phase) Boost Converter. The designed converter was tested with a DC supply with photovoltaic power emulation capability at different input powers to analyze the operation and gather power conversion efficiency data of each configuration option. A calorimeter was designed and implemented as part of the thesis in order to estimate power conversion efficiency values.


Design and implementation of a 200w microinverter for grid connected photovoltaic energy conversion system
Kavurucu, Semih; Hava, Ahmet Masum; Department of Electrical and Electronics Engineering (2014)
As one type of the grid-connected photovoltaic energy conversion systems, micro-inverters (MI, also known as Module Integrated Inverters, MII) are typically designed for residential applications with energy capacities of 3-5 kW and less, in order to provide PV module level energy generation, plug-N-play operation, minimization of the shading effects occurring on the PV module, and flexibility of installation. For the micro-inverter system which can be designed employing variety of topologies, interleaving f...
Design and implementation of a sic based three phase grid-connected current source inverter for solar applications
Bay, Olcay; Ermiş, Muammer; Bilgin, Hazım Faruk; Department of Electrical and Electronics Engineering (2017)
In this thesis, analysis, design and implementation of a three-phase 400V, 20 kVA Current Source Inverter (CSI) have been carried out for grid-connected photovoltaic applications based on the multi-string inverter concept. This inverter can be used in large scale photovoltaic (PV) applications by connecting many in parallel at 400V and coupling to medium voltage through a common transformer. The power stage of the inverter is based on the basic full-bridge CSC topology and each power semiconductor which mus...
Evaluation of Grid-Connected PV Converter Power Module Technologies in Terms of Efficiency, Initial Cost, and Return on Investment Time
Oztoprak, Oguzhan; Hava, Ahmet Masum (2019-01-01)
The voltage source converter (VSC) of the grid connected photovoltaic (PV) systems is the most technological component in a PV system and contributes to 5-15% of the whole investment. As the cost and energy efficiency of a VSC are two factors that determine the total system economics, the system total cost of ownership (TCO) should be optimized during the VSC design. This paper provides a design methodology for grid connected VSCs considering TCO, the return on investment (ROI) and payback period (PP) as th...
Evaluation of Photovoltaic Systems For Reactive Power Compensation In Low Voltage Power Systems
Uğur, Mesut; Duymaz, Erencan; Göl, Murat; Keysan, Ozan (2018-10-25)
The four-quadrant operation ability of photovoltaic (PV) inverters makes them promising candidates for reactive power compensation in low voltage systems. In this paper, utilization of PV inverters instead of conventional reactive power compensation units is evaluated. The use of PV inverters for reactive power compensation as well as active power supplying is investigated considering a real life system. The considered system suffers from low capacitive power factor due to the connected online UPS system. T...
Design and analysis of perfect metamaterial absorber in GHz and THz frequencies
Dincer, Furkan; KARAASLAN, MUHARREM; Sabah, Cumali (2015-12-12)
The new perfect metamaterial absorber (MA) based on square resonator with gap configuration is numerically (for GHz and THz frequency regime) and experimentally (for GHz frequency regime) presented and investigated. The proposed MA has a simple configuration which introduces flexibility to adjust its metamaterial properties and easily rescale the structure for other frequency regimes. In addition, polarization and incident angle independencies of the proposed model are analyzed for the THz frequency regime....
Citation Formats
E. T. Koç, “Design and implementation of all-SiC MPPT boost converter for grid connected photovoltaic systems,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Electrical and Electronics Engineering., Middle East Technical University, 2019.