HVDC > HVDC Light > HVDC Light converter technology > Converter reactor and AC-filter
Components that are connected to the HVDC Light converter on the AC side.
No special converter transformers or phase shifting transformers are needed. But a series reactor is necessary to separate the AC fundamental frequency from the raw PWM waveform. The series reactors consist of air core devices. They are housed in an aluminium enclosure to eliminate the high frequency disturbances from the PWM process.
If necessary, voltage matching can be accomplished with regular transformers. Transformer tap changers are generally not required to regulate AC voltage, maintain nominal firing angles or help match reactive power demand as with conventional HVDC converters.
Cross Sound HVDC Light project, New Haven AC-filter | The Light converter has a switching frequency of 2 kHz. That is 40 times faster compared to a phase-commutated converter operated at 50 Hz. Since there are only high frequency harmonics, shunt filtering is therefore relatively small compared to the converter rating. It is sufficient with a high pass-filter and no tuned filters are needed. |