US 8,553,437 B2 · Method and control device for controlling power flow within a DC power transmission network

Abstract

A method for controlling power flow within a DC power flow within a DC power transmission network includes two or more interconnected converter stations. The method includes the steps of: establishing a common feedback signal (Ud,common, Ũd,common) to the converter stations, the common feedback signal (Ud,common, Ũd,common) being based on an overall voltage level in the DC transmission, power network; providing, in the converter stations, a control signal (S1, S2, S3, S4) based on the common feedback signal (Ud,common) and a drooped error signal (Pe,droop, Ue,droop); and controlling the power flow within the DC power transmission network towards set operating points (Udref, PCCref) by using the control signal (S1, S2, S3, S4). A control device and computer program product is also described.

Claims20

Dependent claims

A method for controlling power flow within a DC power transmission network comprising two or more interconnected converter stations, said method comprising the steps of:

establishing a common feedback signal (Ud,common, Ũd,common) for said converter stations, said common feedback signal (Ud,common, Ũd,common) being based on a voltage level at one, two or more converter stations in said DC transmission power network;
providing, in said converter stations, a control signal (S1, S2, S3, S4) based on said common feedback signal (Ud,common, Ũd,common) and a drooped error signal (Pe,droop, Ue,droop) and
controlling said power flow within said DC power transmission network towards set operating points (Udref, PPCCref) by using said control signal (S1, S2, S3, S4),
wherein said converter stations comprises communication means enabling communication them between, and wherein said step of establishing a common feedback signal comprises communicating, by means of communication means, a common feedback signal (Ud,common) to said converter stations.

1 more element

A multi-terminal DC power transmission system including two or more interconnected converter stations, characterized in that each converter station includes a local control unit for controlling the power flow in the DC power transmission system, and in that

at least one of the converter stations is operated as a pilot node and having the local control unit adapted for establishing a common feedback signal (Ud,common, Ũd,common) for said converter stations, said common feedback signal (Ud,common, Ũd,common) being based on a voltage level at one, two or more converter stations in said DC transmission power network,
the local control units of the converter stations comprising control means for outputting a control signal (S1, S2, S3, S4) based on the feedback signal (Ud,common, Ũd,common) common to said converter stations and a drooped error signal (Pe,droop, Ue,droop), where the power flow within the DC power transmission network is controlled towards set operating points (Udref, PPCCref) using the control signal (S1, S2, S3, S4), and
the converter stations including communication means enabling communication them between, and wherein the common feedback signal is communicated by means of the communication means to the converter stations.

Dependencies are inferred from the claim text.

Method and control device for controlling power flow within a DC power transmission network

Life of this patent

Method and control device for controlling power flow within a DC power transmission network

Life of this patent

Abstract

Claims20