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Voltage-source multilevel inverters have become very attractive for power industries in power electronics applications during last years. The main purposes that have led to the development of the studies about multilevel inverters are the generation of output voltage signals with low harmonic distortion; the reduction of switching frequency. A serious constraint in a multilevel inverter is the capacitor...
A method is presented to balance the two DC-link capacitor voltages for a three-level inverter. Previous work has shown that using the redundant states in space-vector PWM algorithm solves this problem, leaving lower order harmonics or using high switching frequency. Here, it is shown that, the redundant states can be used in selective harmonics elimination PWM in the case of multilevel inverters,...
This paper presents a general modeling and an experimental validation of a doubly fed induction generator (DFIG) based wind conversion system (WCS). The wind conversion system has been briefly presented. Then, the d q control of the grid side converter (GSC) has been detailed theoretically. Moreover, the decoupled active and reactive powers control of the DFIG has been presented. The last is carried...
In this paper, the author's present one algorithm of algebraic PWM strategy for nine - level Neutral Point Clamping (NPC) Voltage Source Inverter (VSI) is presented. This algorithm uses a control model of the inverter developed previously by the authors. In the first part, we develop a working model of this inverter, without presumption on its control, by using the connection functions of this converter...
This paper describes the control and regulation of input DC voltages of nine-level NPC voltage source inverter. The analysis and simulation of a cascade constituted by three phase's five-level PWM rectifier-nine levels NPC voltage source inverter (VSI). In the first part, the authors present the five-level PWM rectifier. After, we present a topology of nine levels NPC VSI for then we propose a model...
The studied application is a back to back power electronic structure feeding a three-phase load. The line side converter is a two-level PWM rectifier controlled by a current hysteresis controller in the abc reference frame. It regulates the dc voltage and enables a unit power factor. The load side converter is a three-level voltage source inverter (VSI), which is controlled by means of a novel vector...
In this paper, the direct modulation strategy of a three-level inverter with self stabilization of the dc link voltage is extended to a five-level inverter. Therefore, a new modeling and control strategy of a five-level three-phase diode-clamped inverter (DCI) is presented. The obtained modeling shows that modulated multilevel voltages are obtained by combination of eight different three-level functions,...
In this paper, the authorpsilas present one algorithm of algebraic PWM strategy for seven-level neutral point clamping (NPC) voltage source inverter (VSI) is presented. This algorithm uses a control model of the inverter developed previously by the authors. In the first part, we develop a working model of this inverter, without presumption on its control, by using the connection functions of this...
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