High voltage direct current (HVDC) transmission system to compensate for voltage values output from a plurality of potential transformers

Patent metadata

Field	Value
Publication number	US-9853558-B2
Application number	US-201514692538-A
Country	US
Kind code	B2
Filing date	Apr 21, 2015
Priority date	May 13, 2014
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A high voltage direct current (HVDC) transmission system is provided. The high voltage direct current (HVDC) transmission system includes: an integrated measurement panel; and an HVDC transmission device, wherein the HVDC transmission device is configured to: receive, from the integrated measurement panel, compensation values for compensating for the voltage values output through the first to Nth potential transformers, compensate for the voltage values output through the first to Nth potential transformers by using the received compensation values, and measure the actual voltage values by using the compensated voltage values.

First claim

What is claimed is:

1. A high voltage direct current (HVDC) transmission system to compensate for voltage values output from a plurality of potential transformers, the HVDC transmission system comprising:
an integrated measurement panel including memory storing a plurality of compensation values each corresponding to one of the plurality of potential transformers, the integrated measurement panel configured to be connected to and disconnected from the plurality of potential transformers; and
an HVDC transmission device connected to the integrated measurement panel and the plurality of potential transformers when the plurality of potential transformers are disconnected from the integrated measurement panel, the HVDC transmission device including:
a deviation compensator configured to:
detect a plurality of voltage values output via the plurality of potential transformers when the plurality of potential transformers are connected to the integrated measurement panel;
receive the plurality of compensation values from the integrated measurement panel;
measure a plurality of actual voltage values corresponding to the plurality of potential transformers; and
compensate the measured plurality of actual voltage values based on the plurality of compensation values; and
a central controller configured to control operation of the HVDC transmission device based on the compensated plurality of actual voltage values,
wherein the integrated measurement panel is configured to determine a compensation value for a new potential transformer based on the plurality of compensation values when the new potential transformer is connected to the HVDC transmission device.

2. The HVDC transmission system according to claim 1 , wherein the integrated measurement panel is further configured to:
supply a reference voltage to the plurality of potential transformers when the plurality of potential transformers is connected to the integrated measurement panel;
measure an output voltage of each of the plurality of potential transformers;
compare each of the plurality of measured output voltages and an average value of the plurality of measured output voltages;
determine the plurality of compensation values according to the comparison for adjusting the plurality of actual voltage values to be the same; and
store each of the determined plurality of compensation values corresponding to the supplied reference voltage.

3. The HVDC transmission system according to claim 2 , wherein each of the plurality of determined compensation values corresponds to a difference between one of the plurality of measured output voltages and the average value.

4. The HVDC transmission system according to claim 2 , wherein the integrated measurement panel is further configured to:
sequentially supply reference voltages in a voltage range divided into a plurality of sections to the plurality of potential transformers; and
determine the plurality of compensation values according to a voltage range of each of the plurality of sections.

5. The HVDC transmission system according to claim 4 , wherein:
the deviation compensator is further configured to transmit information related to voltage sections of a voltage value output by each of the plurality of potential transformers; and
the integrated measurement panel is further configured to extract compensation values for each of the voltage sections from the determined plurality of compensation values and provide the extracted compensation values to the deviation compensator.

6. The HVDC transmission system according to claim 1 , wherein the plurality of compensation values are at least a transformation ratio, offset values to be applied to the plurality of potential transformers or gain values to be applied to the plurality of potential transformers.

Assignees

• Lsis Co Ltd

Inventors

• Choi Yong Kil

Classifications

• H02J3/36 Primary

  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

• Y02E60/60

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

• H02M5/44 Primary

  using discharge tubes or semiconductor devices to convert the intermediate DC into AC · CPC title

• G01R35/02 Primary

  of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating · CPC title

• H02J1/00

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