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In this paper, a fault-tolerant strategy for operation of a cascaded H-bridge multilevel drive is presented. A faulty power cell in the Cascaded H-bridge (CHB) inverter may lead to expensive downtime and great losses in the motor side. With a fault-tolerant control strategy, the operation can continue and the system reliability increases in this way. Here, the operating principle and the space vector...
The presented paper deals with control strategy of flying capacitors multilevel inverters. The main issue is the analysis of the permissible switching states, especially the possibility of the multiple commutations.
Dc-link capacitor voltages must be actively controlled in Multi-Point-Clamped (MPC) converters, in order to achieve a correct voltage sharing. This work demonstrates that when a MPC Active Front End (AFE) rectifier feeds a MPC inverter a balancing strategy does exist that is able to guarantee a correct functioning in all operating conditions. The analytical work, which has been performed to determine...
Using multilevel inverters in fuel cell & solar cell & wind turbines is increasing. Harmonic reduction techniques in multilevel inverters are considered. Mathematical methods for reducing the harmonic are presented in some of the literatures Mathematical methods are not suitable for high level inverters. These methods analyze harmonics with constant output voltage of each inverter.
A novel hybrid three-phase multilevel converter is proposed for medium-voltage applications. The converter employs a conventional three-phase voltage source inverter (VSI) linking series connected half-bridge modules at each phase. With the proposed connection, a large portion of energy can be processed by the VSI without the need for insulation or by employing a single transformer, while smaller...
In this paper, authors presents a novel competitive multilevel converter. The novel cascaded U cells topology is constituted from two power switches and one capacitor for each cell. In case of DC/AC conversion, the proposed fifteen level inverter allows a nearly sinusoidal output voltage resulting on a perfectly sinusoidal load current. In case of AC/DC conversion, the proposed fifteen level rectifier...
The paper presents a comparative study of three different 3D-SVM techniques for the control of flying-capacitor multi-level inverters under both balanced and unbalanced operating conditions. Simulation results show that Direct 3D-SVM is the most efficient in computational effort. Application of this scheme to a three-level FCMI is simulated using the Alternative Transients Program (ATP). Output performance...
This paper presents a model predictive current control strategy for a multilevel cascaded inverter. A simple discrete model is used to predict the behavior of the system for each possible voltage vector generated by the inverter. The voltage vector that minimizes a cost function is selected and applied during a whole sampling interval. The cost function measures the load current error. Due to the...
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