Simulink model of flying capacitor multilevel inverter
ABSTRACT In this paper a method for modelling and simulation in Simulink/Matlab environment of the flying capacitor multilevel inverters is presented. The model is used for the harmonic analysis of the output voltage of the inverter when different PWM strategies are utilized. Under investigation are those strategies that solve the capacitor voltage balancing problem: phase-shift PWM method, the saw-tooth rotation PWM method and carrier redistribution PWM method. The results are shown through simulation.
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ABSTRACT: This paper presents a comparative study between three five-level converters. Control strategies and simulation results are presented in order to show the principles that led to the development of these converters. Advantages and disadvantages are presented in view of the total harmonic distortion factor, the number of semiconductor devices and flying capacitors and the energy stored in the flying capacitors. Multilevel conversion structures represent a solution to improve the performances given by the classical structures with two voltage levels. The cost of the semiconductor devices increases with the increase in voltage. Multilevel structures offer a reduction of the voltage stress that compensates the increased number of devices. Also the analyzed structures offer the advantage of reducing the size of the output filter by reducing the total harmonic content. The development of these structures began with the solution given by Bhagwat in 1980 called Stack Cell Converter (SC) (1). This solution gave a reduction to half of the voltage stress in the semiconductor devices but had the disadvantage of an unequal loss distribution that represented a limitation to the maximum output power that could be achieved. In order to solve this problem, several multilevel structures were developed. Among them the most utilized in industrial applications is the Neutral Point Clamped Converter (NPC) because of the low number of devices used comparative with the other structures (2), (3). This structure was followed by the Active Neutral Point Clamped Converter (ANPC) developed in 2001. It presents the advantage of an increased01/2011;
Conference Paper: A novel flying-capacitor dual buck three-level inverter[Show abstract] [Hide abstract]
ABSTRACT: A novel flying-capacitor dual buck three-level inverter(FCDBTLI) was presented in this paper. It was a kind of flying-capacitor inverter, which was based on the main circuit of dual buck inverter. The topology cherished the merits of dual buck inverter, such as no shoot-through problem, no body diode reverse-recovery problem. The switches array of the inverter is flexible which realizes voltage balancing of the flying capacitors through logical controlling. The validity of the proposed inverter is verified by computer-aided simulation and experimental result.2013 IEEE Applied Power Electronics Conference and Exposition - APEC 2013; 03/2013
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ABSTRACT: The Modular Multilevel Converter (MMC) represents an emerging topology with a scalable technology making high voltage and power capability possible. The MMC is built up by identical, but individually controllable submodules. Therefore the converter can act as a controllable voltage source, with a large number of available discrete voltage steps. This characteristic complicates the modelling both mathematically and computational. A mathematical model of the MMC is presented with the aim to develop a converter control system and the model is converted into the dq reference frame. Block diagrams for control of active power and AC voltage magnitude are shown.Energy Procedia 01/2012; 20:227–236.