Power electronic converter

摘要

A power electronic converter for high/medium voltage direct current power transmission and reactive power compensation comprises a primary converter unit and an auxiliary converter unit, the primary converter unit including at least one primary converter limb including first and second DC terminals for connection in use to a DC network and an AC terminal, the or each primary converter limb defining first and second limb portions, each limb portion including at least one primary module, the or each primary module including at least one primary switching element connected to an energy storage device, the auxiliary converter unit including at least one auxiliary converter limb including at least one auxiliary module including a plurality of auxiliary switching elements connected to the energy storage device of a corresponding primary module in the first limb portion of a respective primary converter limb, the primary switching elements of the primary modules being controllable in use to switch the respective energy storage device in and out of circuit to generate a voltage waveform at the respective AC terminal.

主权项

1. A power electronic converter for high/medium voltage direct current power transmission and reactive power compensation comprising a primary converter unit and an auxiliary converter unit, the primary converter unit including at least one primary converter limb including first and second DC terminals for connection in use to a DC network and an AC terminal, the or each primary converter limb defining first and second limb portions, each limb portion including at least one primary module connected in series between a respective one of the first and second DC terminals and the AC terminal, the or each primary module including at least one primary switching element connected to an energy storage device, the or each primary converter limb further including a first transformer winding connected in series with the respective AC terminal for connection in use between the respective AC terminal and an AC network; the auxiliary converter unit including at least one auxiliary converter limb including first and second auxiliary terminals, the or each auxiliary converter limb further including at least one auxiliary module connected in series with a second transformer winding between the first and second auxiliary terminals, the or each auxiliary module including a plurality of auxiliary switching elements connected to the energy storage device of a corresponding primary module in the first limb portion of a respective primary converter limb, the second transformer winding of the or each auxiliary converter limb being mutually coupled with the first transformer winding of the respective primary converter limb, the primary switching elements of the primary modules being controllable in use to switch the respective energy storage device in and out of circuit to generate a voltage waveform at the respective AC terminal.