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Switched converters are a source of electromagnetic interference (EMI) due to the hard switching and abrupt edges in the current and voltage waveforms. Multiphase converters can reduce the EMI at the source, minimizing the conducted EMI generation, without changing dramatically the normal operation of the circuit. Input filter can be greatly reduced, radiated EMI is lower, and internal EMI problems...
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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