Multiple‐Input Single‐Output High‐voltage AC–DC Converters

In the high‐voltage direct current (HVDC) transmission system, there are several AC input sources which need to be converted to DC form; the common solution is to apply one AC‐DC converter for each AC source and then connect all of the DC output sides together. In order to simplify the structure of the whole system, this chapter proposes a series of AC‐DC converters with multiple AC inputs and single DC output. In order to avoid using high‐voltage capacitors in the topology, the single‐phase 2M‐arm multiple‐input single‐output AC‐DC converter can be constructed by replacing the series capacitors with switching arms. If the input voltage sources are in three‐phase form, then the three‐phase multiple‐input single‐output AC‐DC converter can be constructed by adding one general phase unit to the single‐phase 2M‐arm AC‐DC converter.