Changeover method of HVDC transmission system

Patent metadata

Field	Value
Publication number	US-9847637-B2
Application number	US-201514684133-A
Country	US
Kind code	B2
Filing date	Apr 10, 2015
Priority date	Apr 14, 2014
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A changeover method of a high voltage direct current (HVDC) transmission system is provided. A first system is set to an active state. A ready signal is transmitted from the first system to a first COL. A ready detection signal and an active signal are transmitted to the first system, in response to the ready signal. A confirm signal is transmitted to the first system in response to the active signal when the ready detection signal matches the ready signal.

First claim

What is claimed is:

1. A changeover method of a high voltage direct current (HVDC) transmission system comprising a first system, a second system, a first changeover logic (COL), and a second COL, the changeover method comprising:
setting the first system to an active state and the second system to an inactive state;
transmitting a ready signal from the first system to the first COL;
transmitting a ready detection signal and an active signal from the first COL to the first system, in response to the ready signal;
transmitting a first confirm signal from the first system to the first COL in response to the active signal when the ready detection signal matches the ready signal;
transmitting a system signal from the first system to the first COL;
obtaining a fault signal by the first COL after transmission of the system signal from the first system to the first COL;
transmitting a fault detection signal from the first COL to the first system in response to the obtained fault signal;
determining, by the first system, whether the system signal and the fault detection signal are the same, wherein the system signal includes the fault signal when the first system has a fault and the fault detection signal is equal to the fault signal;
transmitting a second confirm signal from the first system to the first COL when the system signal and the fault detection signal are determined to be the same at the first system; and
changing, by the first COL, the first system from the active state to the inactive state and changing the second system from the inactive state to the active state, in response to the second confirm signal.

2. The changeover method according to claim 1 , further comprising changing, by the first COL, the first system to the inactive state and changing the second system to the active state, when the confirm signal is not received by the first COL for a time equal to or longer than a critical time after the fault detection signal is transmitted by the first COL.

3. The changeover method according to claim 1 , wherein the obtaining of the fault signal by the first COL comprises obtaining the fault signal when the first COL fails to receive a specific signal transmitted by the first system.

4. The changeover method according to claim 1 , further comprising maintaining the inactive state of the first system and the active state of the second system even when the fault signal is not obtained by the first COL after the second system is changed to the active state.

5. The changeover method of claim 1 , further comprising transmitting another active signal to the second system to continue to perform an operation for the HVDC transmission system when the second system is changed from the inactive state to the active state.

Assignees

• Lsis Co Ltd

Inventors

• Kim Eung Soo
• Kim Jong Bae
• Lee Seung Hun

Classifications

• H02J13/00

  Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network · CPC title

• H02J3/36

  Arrangements for transfer of electric power between AC networks via high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links · CPC title

• B61L3/08

  controlling electrically · CPC title

• Y02E60/60

  Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD] · CPC title

• H02J1/00 Primary

  Circuit arrangements for DC mains or DC distribution networks · CPC title