Spannungsquellenumrichter

Details

Veröffentlichungs-Nr.

EP3361619

Aktenzeichen

EP17155458

Anmeldetag

9. Februar 2017

Veröffentlichung

9. Oktober 2019

Erteilung

9. Oktober 2019

Rechtsraum

EP

IPC

H02M7/483H02M7/797

Abstract

A voltage source converter (30) comprises first and second DC terminals (32,34) for connection to a DC network (58), the voltage source converter (30) including a plurality of limbs connected between the first and second DC terminals (32,34), each limb including: a phase element (36) having a plurality of switching elements (40) and at least one AC terminal for connection to a respective phase of a multi-phase AC network (50), the plurality of switching elements (40) configured to be switchable to selectively interconnect a DC side voltage at a DC side of the phase element (36) and an AC side voltage at an AC side (42) of the phase element (36); a first sub-converter (38) configured to be controllable to act as a waveform synthesizer to modify a first DC voltage presented to the DC network (58), the first sub-converter (38) including at least one energy storage device capable of storing and releasing energy to selectively provide a voltage; and a second sub-converter (39) connected with the phase element (36) in an electrical block, the first sub-converter (38) connected in parallel with the electrical block, the second sub-converter (39) configured to be controllable to act as a waveform synthesizer to modify a second DC voltage presented to the DC side of the phase element (36), the second sub-converter (39) including at least one energy storage device capable of storing and releasing energy to selectively provide a voltage, wherein the voltage source converter (30) further includes a controller (60) configured to selectively operate in an energy management mode when there is an imbalance between the AC side voltages at the AC sides (42) of the phase elements (36), the controller (60) in the energy management mode configured to operate each limb so as to: control at least one sequence current component of a respective phase current at the AC side (42) of each phase element (36) to control an exchange of power between the voltage source converter (30) and the AC network (50); and balance the AC and DC side powers exchanged by each limb with the AC and DC networks (50,58) respectively so that a respective net change in energy stored in the energy storage devices of each limb is controlled to be zero or substantially zero.

Anmelder

Firma

General Electric Technology GmbH

Land

🇨🇭 Schweiz

Fachgebiete