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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...
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...
This paper presents a new feedback control strategy for balancing individual DC capacitor voltages in a three-phase cascade multilevel inverter-based static synchronous compensator. The design of the control strategy is based on the detailed small-signal model. The key part of the proposed controller is a compensator to cancel the variation parts in the model. The controller can balance individual...
This paper analyses a possibility for realization of multilevel inverters. After general description of all famous solutions, the focus is paid on diode clamped multilevel inverters (DCMI) and flying capacitor multilevel inverters (FCMI). The comparison of topological structure differences and control strategies is presented. The special focus is paid to balancing of voltages on capacitors. Switching...
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