HVDC converter including fullbridge cells for handling a DC side short circuit

摘要

A power electronic converter for use in high voltage direct current power transmission and reactive power compensation comprises three converter limbs, each converter limb including first and second DC terminals for connection in use to a DC network and an AC terminal for connection in use to a respective phase of a three-phase AC network, each converter limb defining first and second limb portions being connected in series between the respective AC terminal and a respective one of the first and second DC terminals, each limb portion including at least one switching element being controllable in use to facilitate power conversion between the AC and DC networks, the power electronic converter further including a plurality of auxiliary units, each auxiliary unit being operably associated with the respective phase of the AC network, each auxiliary unit including at least one module including a voltage source, the limb portions being controllable in use to define at least one three-phase static synchronous compensator including at least one of the plurality of auxiliary units in each branch of a star configuration, each of the first and/or second DC terminals defining the neutral point of the respective star configuration.

主权项

1. A power electronic converter for use in high voltage direct current power transmission and reactive power compensation comprising three converter limbs, each converter limb including first and second DC terminals for connection in use to a DC network and an AC terminal for connection in use to a respective phase of a three-phase AC network, each converter limb defining first and second limb portions being connected in series between the respective AC terminal and a respective one of the first and second DC terminals, each limb portion including at least one switching element and at least one auxiliary unit (44) controlled in use to facilitate power conversion between the AC and DC networks each auxiliary unit including at least one chain-link module (60) capable of generating a bidirectional voltage and conducting a bidirectional current, the first and second limb portions (56, 58) being separately controlled in use to form two independent three-phase voltage sources of variable magnitude and phase angle, to define at least one three-phase static synchronous compensator including at least one of the plurality of the auxiliary units (44) in each branch of a star configuration, each of the first and/or second DC terminals (46, 48) defining the neutral point of the respective star configuration.