US 12,119,655 B2 · Energy supporting device

Abstract

An energy supporting device for a high voltage direct current, HVDC, transmission system is provided. The HVDC transmission system includes a first HVDC converter and a second HVDC converter connected to each other via an HVDC link. The energy supporting device comprises a plurality of cells configured to be connected in series to the HVDC link, a resistor electrically connected between the plurality of cells and an electrical reference potential, and a bypass switch configured to allow the resistor to be bypassed. A cell includes a full-bridge arrangement of power switches and an energy storage device electrically connected to the full-bridge arrangement. The energy supporting device is configured to be operated in: a charging mode, in which the bypass switch is in a closed state for allowing the resistor to be bypassed, and in which the energy storage device of at least one cell of the plurality of cells is receiving electrical energy from the HVDC link, and in a dissipation mode, in which the bypass switch is in an open state for allowing the resistor to dissipate electrical energy from the HVDC link, and in which the energy storage devices of the plurality of cells are bypassed, and in an energy release mode, in which the energy storage device of at least one cell of the plurality of cells is discharging electrical energy to the HVDC link.

Claims15

Dependent claims

An energy supporting device for providing grid forming and/or virtual synchronous machine, VSM, capabilities to a high voltage direct current, HVDC, transmission system including a first HVDC converter and a second HVDC converter connected to each other via an HVDC link, wherein the energy supporting device comprises:

a plurality of cells configured to be connected in series to the HVDC link, wherein a cell includes:
a full-bridge arrangement of power switches;
and
an energy storage device electrically connected to the full-bridge arrangement;
a resistor electrically connected between the plurality of cells and an electrical reference potential;
and
a bypass switch configured to allow the resistor to be bypassed;
wherein the energy supporting device is configured to be operated in:
a charging mode, in which the bypass switch is in a closed state for allowing the resistor to be bypassed, and in which the energy storage device of at least one cell of the plurality of cells is receiving electrical energy from the HVDC link;
a dissipation mode, in which the bypass switch is in an open state for allowing the resistor to dissipate electrical energy from the HVDC link, and in which the energy storage devices of the plurality of cells are bypassed;
and
an energy release mode, in which the energy storage device of at least one cell of the plurality of cells is discharging electrical energy to the HVDC link to thereby provide the grid forming and/or VSM capabilities.

9 more elements

A method for providing grid forming and/or virtual synchronous machine, VSM, capabilities to a high voltage direct current, HVDC, transmission system including a first HVDC converter and a second HVDC converter connected to each other via an HVDC link, wherein the grid forming and/or virtual synchronous machine, VSM, capabilities is provided by means of an energy supporting device comprising:

a plurality of cells connected in series to the HVDC link, wherein a cell includes:
a full-bridge arrangement of power switches;
and
an energy storage device electrically connected to the full-bridge arrangement;
a resistor electrically connected between the plurality of cells and an electrical reference potential;
and
a bypass switch configured to allow the resistor to be bypassed;
the method comprising the steps of:
dissipating a surplus of electrical energy from the HVDC link by opening the bypass switch of the energy supporting device and transmitting the surplus of electrical energy to the resistor of the energy supporting device;
and
releasing electrical energy to the HVDC link by discharging electrical energy from the energy storage device of at least one cell of the plurality of cells to thereby provide the grid forming and/or VSM capabilities.

8 more elements

Dependencies are inferred from the claim text.

Energy supporting device

Life of this patent

Energy supporting device

Life of this patent

Abstract

Claims15