Investigation into various forms of pulse-width modulated inverters.

Tanju, Celal


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The thesis focuses on the analysis and control of modular multilevel converter (MMC). The control structures used in the control of MMC are presented. Outer control loops of the converter such as output current, DC-link voltage, and power controls as well as inner control structures unique to the converter such as circulating current control and sorting algorithm based submodule voltage balancing are investigated. In addition, switching methods proposed for MMC are also described. These control and switchin...
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In conventional three-phase PWM (Pulse Width Modulation) current source converter based STATCOM (Static Synchronous Compensator) applications, DC link current is kept constant at a predefined value and the reactive power of STATCOM is controlled by varying modulation index. This control strategy causes unnecessary power losses especially when the reactive power of STATCOM is low. For this purpose, in order to reduce the active power drawn by STATCOM, the modulation index can be maximized by adjusting DC lin...
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Taştan, Umur; Çetinkaya, Tahsin Ali; Department of Mechanical Engineering (2011)
In this study; reliability and performance of turbulence models used in CFD softwares to determine the aerodynamics of passenger cars, are tested and compared. In the analyses, drag forces acting on the car, pressure and velocity distributions and wake flow patterns are determined by using several turbulence models with a commercial software Fluent. Calculated results compared to the experimental results given in the literature. It is observed that, turbulence models give relatively reliable results for det...
Comparison of Efficiency of Two dc-to-ac Converters for Grid Connected Solar Applications
Ertan, Hulusi Bülent; Yilmaz, Arif (2012-05-26)
In this paper; requirements from grid connected photovoltaic (PV) converters are briefly reviewed. Traditional buck-converter, line-frequency transformer topology is taken as reference, which satisfies all of the requirements imposed by standards and the utility. However, this topology employs a bulky transformer. Furthermore, a large electrolytic capacitor is needed in this circuit, which is expensive and also limits the life of the converter. This is not desirable in modern applications where PV module st...
Citation Formats
C. Tanju, “Investigation into various forms of pulse-width modulated inverters.,” Ph.D. - Doctoral Program, Middle East Technical University, 1972.