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Multimodule converter based high-voltage dc (HVDC) power transmission incorporates numerous voltage-source converters (VSCs) connected in series/parallel to provide increased voltage/current and hence power ratings. When a selective harmonic elimination pulse-width modulation (SHE-PWM) technique is employed to reduce the switching losses of the VSC modules, equalizing the voltages of the series-connected...
A high-voltage direct current (HVDC) power transmission system based on eight voltage-source converter (VSC) modules is discussed in this paper. The system is operated with a selective harmonic elimination (SHE) pulse-width modulation (PWM) scheme, which is pre-calculated as a single multilevel waveform. There are many degrees of freedom on how such single multilevel waveform can be used to derive...
This paper discusses optimal selective harmonic elimination (SHE) pulse-width modulation (PWM) patterns derived from a pre-calculated 9-level waveform. The patterns are suitable for a high-voltage direct-current (HVDC) power transmission system based on eight conventional three-phase voltage-source converter (VSC) modules. The switching frequency of each module is maintained very low and is used as...
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