System for measuring loss of HVDC

Patent metadata

Field	Value
Publication number	US-9733278-B2
Application number	US-201514683029-A
Country	US
Kind code	B2
Filing date	Apr 9, 2015
Priority date	Apr 14, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A system for measuring a loss in power between a power transmission side and a power reception side in a high voltage direct current (HVDC) system is provided. The system for measuring the loss in power includes: a first loss measurement unit installed at the power transmission side, and a second loss measurement unit installed at the power reception side, wherein each of the first and second loss measurement units is installed at a location at which a current or voltage is measured, and includes a voltage sensor for measuring a voltage, a current sensor for measuring a current, a GPS module for providing time information on when measurement is performed by the voltage sensor and the current sensor, and a storage unit storing the time information along with a voltage value and a current value measured by the voltage sensor and the current sensor.

First claim

What is claimed is:

1. A system for measuring a loss in power between a power transmission side and a power reception side in a high voltage direct current (HVDC) system, the system comprising:
a first loss measurement unit installed at the power transmission side,
a second loss measurement unit installed at the power reception side, and
a main control unit storing identification information on each of the first and second loss measurement units,
wherein each of the first and second loss measurement units is installed at a respective location at which a current or voltage is measured, and comprises:
a respective voltage sensor for measuring a voltage,
a respective current sensor for measuring a current,
a respective GPS module for providing time information on when measurement is performed by the voltage sensor and the current sensor, and
a respective storage unit storing the time information along with a voltage value and a current value measured by the voltage sensor and the current sensor,
wherein the main control unit is configured to;
receive the respective voltage and current values measured by each of the first and second measurement units, and
calculate a loss in power between the first and second loss measurement units according to the received voltage and current values.

2. The system according to claim 1 , wherein the first and second loss measurement units are configured to store identification information identifying the loss measurement units.

3. The system according to claim 1 , wherein:
each of the first and second loss measurement units further comprises a respective communication module enabling data communication with an external device or the main control unit, and
the first and second loss measurement units are configured to transmit respective measured time information along with the respective measured current values and the voltage value regularly values via the respective communication module.

4. The system according to claim 1 , wherein the HVDC system comprises a power transmission side transformer and a power reception side transformer transforming a voltage according to a turn ratio, a power transmission side transformer gas insulated switchgear (GIS) being a switching device provided at the input of the power transmission side transformer, and a power reception side transformer GIS being a switching device provided at the output of the power reception side transformer, and
the first loss measurement unit is connected to the input of the power transmission side transformer GIS, and the second loss measurement unit is connected to the output of the power reception side transformer GIS.

5. The system according to claim 1 , wherein the HVDC system comprises a power transmission side high pass filter (HPF) and a power reception side HPF for removing a high frequency component, a power transmission side filter GIS being a switching device provided at the input of the power transmission side HPF, and a power reception side filter GIS being a switching device provided at the output of the power reception side HPF, and
the first loss measurement unit is connected to the input of the power transmission side filter GIS, and the second loss measurement unit is connected to the output of the power reception side filter GIS.

6. The system according to claim 1 , wherein:
the HVDC system comprises a power transmission line connecting thyristor valves of the power transmission side and the power reception side, and a ground line to which a ground voltage is applied,
each of the first and second loss measurement units is configured to connect the power transmission line and the ground line,
the first loss measurement unit is provided at the power transmission side thyristor value side, and
the second loss measurement unit is provided at the power reception side thyristor value side.

7. The system according to claim 1 , further comprising:
a power transmission side loss measurement unit connected to the input of the power transmission side transformer, and
a power reception side loss measurement unit connected to the output of the power reception side transformer.

8. A loss measurement system for an HVDC system, the loss measurement system comprising:
a power transmission side transformer installed at a power transmission side transmitting power to a power reception side,
a power transmission side thyristor valve converting a voltage output from the transformer,
a power transmission side HPF connected to the power transmission side transformer in parallel and removing a high frequency component of the power,
a power transmission side loss measurement unit connected to the HPF and measuring a voltage value or current value,
a power transmission line connecting the power transmission side to the power reception side,
a power reception side thyristor valve installed at the power reception side and connected to the power transmission line,
a power reception side transformer connected to the thyristor valve,
a power reception side HPF connected to the power reception side transformer in parallel and removing a high frequency component of the power output from the power reception side transformer,
a power reception side loss measurement unit connected to the power reception side HPF and measuring a voltage value or current value,
a main control unit storing identification information on each of the power transmission side loss measurement unit and the power reception side loss measurement unit,
wherein each of the power transmission loss measurement unit and the power reception side loss measurement unit comprises:
a respective sensor for measuring a voltage or current,
a respective GPS module for providing time information on when measurement is performed by the sensor, and
a respective storage unit storing the time information along with a voltage value and a current value measured by the sensor,
wherein the main control unit configured to
receive the respective voltage and current values measured by each of the power transmission side loss measurement unit and the power reception side loss measurement unit, and
calculate a loss in power between the power transmission side loss measurement unit and the power reception side loss measurement unit according to the received voltage and current values.

9. The loss measurement system according to claim 8 , further comprising:
a power transmission side filter GIS connected to the power transmission side HPF and performing a switching function,
a power reception side filter GIS connected to the power reception side HPF and performing a switching function,
wherein the power transmission side loss measurement unit installed at both the power transmission side HPF and filter GIS.

10. The loss measurement system according to claim 9 , wherein the power reception side loss measurement unit installed at both the power reception side HPF and filter GIS.

11. The loss measurement system according to claim 8 , further comprising:
a ground line which connects the power reception side and the power transmission side and to which a ground voltage is applied, and
first and second loss measurement units, each being connected to the power transmission line and the ground line,

wherein the first loss measurement unit is provided at a power transmission side thyristor valve side and the second loss measurement unit is provided at a power reception side thyristor valve side.

Assignees

• Lsis Co Ltd

Inventors

• Choi Yong Kil
• Lee Eun Jae

Classifications

• 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

• G01R21/133

  by using digital technique · CPC title

• Y02E60/60

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

• G01R21/06

  by measuring current and voltage (G01R21/08 - G01R21/133 take precedence) · CPC title

• H02J3/18

  Arrangements for adjusting, eliminating or compensating reactive power in networks · CPC title