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In this paper, a high power grid-connected cascaded H-bridge multilevel inverter (CHB-MLI) operating with Selective Harmonic Elimination (SHE) is presented complying with the low switching frequency operation limitation. In order to alleviate the complexity of employing SHE at high level order, Quasi seven level SHE (Q7L-SHE) approach is employed in this paper. Q7L-SHE is based on cancelling the fifth...
Generally, selective harmonic elimination (SHE) complexity for multilevel converters increases with the increase in number of levels. In this paper, an approach for multilevel converters' SHE is introduced. This approach is based on cancelling the 5th and 7th order harmonics irrelevant of the number of levels in three-phase cascaded-type multilevel converters with unequal DC sources, such that the...
Generally, selective harmonic elimination (SHE) complexity for multilevel inverters increases with the increase in number of levels. In this paper, a novel approach for SHE is introduced. This approach is based on cancelling the 5th and 7th order harmonics irrelevant of the number of levels in threephase multilevel converters, such that the solution for the angles required for the proposed SHE mimics...
Three-phase current source inverter (CSI)-based induction motor (IM) drives are attractive in MV applications since they feature a simple inverter structure, a lower switching dv/dt, and a reliable short circuit protection. Although multiphase machine topic, especially the five-phase one, gains considerable interest recently in literature, almost all the applied control methods are targeting voltage...
The development of static power converters capable of transforming DC energy obtained from alternative sources into AC has become one of the main challenges in renewable energy systems. In this context, the buck-boost inverter is advantageous for being capable of providing an AC output voltage higher or lower than the input DC voltage in a single power conversion stage. In this paper, a controller...
A new control strategy for megawatt scale series connected multilevel photovoltaic (PV) inverters is proposed. The proposed strategy ensures balanced operation under partial shading. Further under transient grid conditions such as low voltage ride through (LVRT) it is shown that the system remains connected and is fully controllable. In the proposed system, the PV arrays are grouped into zones and...
In this paper, a new control strategy for megawatt scale multilevel photovoltaic (PV) inverters under partial shading is proposed. In the proposed system, the photovoltaic arrays are divided into zones and each zone is connected to DC to AC inverter. The DC to AC inverters of multiple zones are connected in series to form the required medium voltage and transfer power to the grid. In such a system...
This paper presents an enhanced average model of a voltage source inverter (VSI) that can accurately predict some of the low frequency phenomena only seen by the switching models. These phenomena include the dead time, voltage drop across switching devices (switch & diode), different modulation and minimum pulse width. Simulation and experimental results with a 2 kW prototype is used for validation...
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