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This paper proposes a fifteen level H-Bridge cascaded multilevel inverter with fundamental frequency switching for low power applications such as solar powered power supplies, battery powered standby power supplies. The effect of the variation of gate pulse on the performance of the inverter for different conditions of gate pulse variation is studied and simulation results are presented. Experimental...
In this paper several fault tolerant strategies which can be implemented on nine switch inverter has been investigated. The developed strategies provide compensation for open circuit and short circuit failures on semiconductor devices. In addition unique post fault controls have been proposed for each strategy. The first applied topology is switch redundant topology and can tolerate all switch failures...
The concept of Dynamic Capacitor or D-CAP has been previously introduced by the authors. D-CAP is able to provide dynamic VAR and harmonic compensation in one single integrated unit. The topology is based on an AC chopper with the control based on the novel concept of virtual quadrature sources, where energy is exchanged between virtual sources at different frequency, instead of between DC and AC...
The aim of this paper is to discuss new alternatives for three-phase grid connected photovoltaic systems featuring harmonic compensation capability. The conventional and other five different topologies are presented and explained emphasizing the advantages and disadvantages in a scenario where current harmonic compensation is required. The topologies are based in the parallel operation of two grid-connected...
The paper describes an investigation of inverter fault-tolerant vector control for permanent-magnet synchronous motor (PMSM) driven by a fault-tolerant inverter. The inverter is a topology-modified inverter with fault-tolerant capability, which can be configured as the standard 3-phase 6-switch inverter under the inverter health condition and reconfigured as 3-phase 4-switch inverter under the inverter...
To increase the fault tolerance for cascaded H-bridge inverter, a novel powerful driver is introduced for H-bridge drive and protection. This driving-circuit could drive four high power IGBTs simultaneously, with slowly decreasing grid-voltage and softly turn-off based over-current protection, the H-bridge and cascaded system could be protected effectively. Characteristics of over-current protection...
The fault-tolerant design for any-level flying capacitor multilevel inverters is discussed in this paper, which is based on the novel combination scheme for flying capacitor multilevel inverters. When a power switch fault is detected in a single-phase, the same number of voltage levels can be maintained by reconfiguring the n-cell topology to a (n-1) cell topology. If two power switches in one same...
This paper investigates in a topology of medium voltage inverter retained to guarantee severe conditions concerning environmental and reliability requirements. This system is based on a standard three levels NPC (Neutral Point Clamped) drive with redundant IGBT and can tolerate the on-state failure mode of the IGBT. Like this, in the operation mode the inverter has been designed to run in permanent...
The reliability of the VSI (Voltage Source Inverter) components such as semi-conductor switches is critical for the shunt active power filters. A failure in one of the switches decreases system performances and usually leads to disconnect the filter. So, to prevent such undesirable events, real-time fault detection, isolation and compensation must be implemented. This paper proposes new robust fast...
This paper gives a solution to implement a self-diagnosis and tolerant control for a 3-level neutral point clamped inverter. Redundancies in semiconductor configurations are used to enable a continuous operation with a faulty power switch. The fault tolerance is obtained by using a SCR to substitute faulty switch. In case of failure events, the on-line diagnosis technique can fix faulty switch and...
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