Design and implementation of a sic based three phase grid-connected current source inverter for solar applications

Bay, Olcay
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 must have bipolar voltage blocking and unidirectional current carrying capability is formed by connecting a Silicon Carbide (SiC) MOSFET and a SiC Shottky Barrier Diode (SBD) in series and switched by employing Pulse Width Modulation (PWM) method with a carrier frequency of 25 kHz. The Current Source Inverter (CSI) offers several advantages for PV applications in terms of its ability to transfer power through a single power conversion stage over the entire MPP voltage range, direct output current controllability, and low Total Harmonic Distortion (THD) values over a wide range of output power with simpler AC filter. Results of this research have shown that CSI will become a strong alternative to Voltage Source Inverter (VSI) for PV applications with the widespread use of high voltage and current SiC power semiconductors.


Design and implementation of all-SiC MPPT boost converter for grid connected photovoltaic systems
Koç, Elif Tuğçe; Ermiş, Muammer; Department of Electrical and Electronics Engineering (2019)
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 convers...
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...
Performance analysis and comparison of reduced common mode voltage PWM and standard PWM techniques for three-phase voltage source inverters
Un, E; Hava, Ahmet Masum (2006-03-23)
This paper investigates the performance characteristics of the reduced common mode voltage (RCMV) PWM methods for three phase voltage source inverters and provides a comparison with the standard PWM methods. PWM methods are reviewed and their pulse patterns and common mode voltage patterns illustrated. The AC output current ripple, DC link input current ripple, and output voltage linearity characteristics of each modulation method are thoroughly investigated by analytical methods and simulations. The analys...
A Kalman Filter Based Approach for Light Flicker Evaluation of Power Systems
Kose, Neslihan; Salor, Ozgul; Leblebicioğlu, Mehmet Kemal (2009-01-01)
In this paper, a Kalman filtering based approach is proposed to measure the light flicker of the electricity transmission systems. Analytical expressions of the instantaneous light flicker sensation are obtained beginning from a voltage waveform and these expressions are used to obtain a flicker estimation method based on the IEC (International Electrotechnical Commission) flickermeter. In the proposed method, the frequency domain components of the waveform are obtained by Kalman filtering and these compone...
Common-Mode Voltage Reduction Pulsewidth Modulation Techniques for Three-Phase Grid-Connected Converters
Hou, Chung-Chuan; Shih, Chih-Chung; Cheng, Po-Tai; Hava, Ahmet Masum (2013-04-01)
This paper experimentally investigates the performance of three-phase voltage source pulsewidth modulation (PWM) converter, with the grid interfaced photovoltaic energy conversion system being the main application. In such applications the ground leakage current [common mode current (CMC)] should be much less than an ampere and this is difficult to obtain in transformerless (direct) connected systems. With the target being the reduction of the common mode voltage (CMV) and CMC, the converter performance is ...
Citation Formats
O. Bay, “Design and implementation of a sic based three phase grid-connected current source inverter for solar applications,” M.S. - Master of Science, Middle East Technical University, 2017.