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The recently introduced active NPC (ANPC) converter is becoming an attractive topology of multilevel converter family. This paper presents the analysis of the 5-level ANPC converter with an optimum PWM strategy to achieve the minimized total harmonic distortion (THD) for high power or high frequency applications. Instead of relying on the conventional look-up table based on off-line calculated solutions,...
This paper presents one solution to a question what is the maximum switching frequency of a hybrid digital pulse width modulator (DPWM) if semiconductor process is given and resolution bit number is set high. This paper also proposes a hybrid DPWM structure where voltage controlled oscillator (VCO) and delay line are separated so as to enhance design flexibility and decrease power consumption. And,...
Static synchronous compensator (STATCOM), providing quick and robust voltage support, is an "enabling infrastructure technology" for the electric power system today. Based on the emerging emitter turn-off (ETO) thyristor and cascaded-multilevel converter (CMC) comprising modular H-bridge voltage source converters (VSCs), a 4.5MVA prototype STATCOM system is developed. In this paper, the...
This paper proposes an optimal modulation strategy for a static synchronous compensation (STATCOM) using a seven-level cascade multilevel converter without any filter. Cascade multilevel converters have been used in STATCOM application due to its ability to reduce harmonics and increase output power by increasing the level of output voltages for a given semiconductor device without device series connection...
This paper introduces the new generation emitter turn-off (ETO) thyristor, which improves the output waveform quality of the high power PWM voltage source converters. Besides its 4000 A snubberless turn-off capability, high di/dt turn-on capability, and short turn-off storage time, the new generation ETO has a unique function: when the upper and the lower ETOs within a converter phase leg are connected...
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