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In this paper an exhaustive analysis of the utilization of the second harmonic component of the circulating currents in a modular multilevel converter for HVDC application is presented, with the aim of highlighting the effects on the maximum arm energy ripple, i.e. capacitors voltage ripple, and on semiconductor losses. Simulation results are presented and design remarks are indicated.
A new generalized space vector modulator for cascaded multilevel converters is presented, featuring centralized control, fault tolerant and common mode voltage reduction capabilities. The SVPWM technique is based on the redundancy properties inherent in multilevel modulation schemes and is validated through a case study. Simulation and experimental results are presented.
A new generalized fault tolerant space vector modulator for cascaded multilevel converters is presented. Exploiting the redundancy properties inherent in multilevel modulation schemes, a generalized space vector modulation algorithm is devised, also aimed to the extension of the normal, full rated operation, to a limited rate, fault tolerant mode. Based on the exploitation of switching vectors redundancy...
Neutral Point Clamped (NPC) converter topology is one of the most widespread static conversion structures used in high power medium voltage industrial applications. In recent years, fault tolerance has become one of the most interesting features which could be requested by the market, in order to improve plants reliability and availability, thus avoiding, for example, the stop of means of transport...
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