Dynamic line rating determination apparatus and associated method

Patent metadata

Field	Value
Publication number	US-10447041-B2
Application number	US-201615574854-A
Country	US
Kind code	B2
Filing date	May 17, 2016
Priority date	May 18, 2015
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A dynamic line rating determination apparatus configured to control the current applied to a power line conductor by determining a dynamic maximum current rating for said power line conductor, based on measured voltage and current phase vectors taken at two temporally spaced sample times, the phase vectors including a voltage and current phase vector for each phase of electrical power carried by the power line conductor at a first and second end of the power line conductor; and determining the dynamic maximum current rating by; applying the phase vectors to a power line model to estimate the conductor temperature, applying the estimate to a thermal model to predict a steady state temperature that the power line conductor will reach, and calculate the dynamic maximum current rating based on the prediction of the steady state temperature, a power line conductor current, and a maximum temperature limitation value.

First claim

What we claim is:

1. A dynamic line rating determination apparatus configured to provide for the control of the current applied to a power line conductor by determination of a dynamic maximum current rating for said power line conductor, the apparatus configured to;
based on a set of measured voltage and current phase vectors taken at, at least two temporally spaced sample times, the voltage and current phase vectors comprising;
a voltage phase vector for each phase of electrical power carried by the power line conductor at a first end of the power line conductor;
a voltage phase vector for each phase of electrical power carried by the power line conductor at a second end of the power line conductor;
a current phase vector for each phase of electrical power carried by the power line conductor at a first end of the power line conductor; and
a current phase vector for each phase of electrical power carried by the power line conductor at a second end of the power line conductor;
determine the dynamic maximum current rating by;
applying said set of voltage and current phase vectors to a predetermined power line model to determine an estimate of the real time conductor temperature,
applying said estimate of the real time conductor temperature to a predetermined thermal model to determine a prediction of a steady state temperature that the power line conductor will reach over time, and
calculating the dynamic maximum current rating based on at least said prediction of the steady state temperature, a power line conductor current, and a maximum temperature limitation value.

2. An apparatus according to claim 1 , wherein a set of positive sequence components, derived by a method of symmetrical components, of the voltage and current phase vectors is applied to the predetermined power line model, the set of positive sequence components comprising;
a positive sequence voltage component for the first end;
a positive sequence voltage component for the second end;
a positive sequence current component for the first end; and
a positive sequence current component for the second end.

3. An apparatus according to claim 1 , wherein the set of positive sequence components are determined based on the following equation;

[

V
.

S

I
.

S

V
.

R

I
.

R

]

=

1
3

⁡

[

1

α

α
2

]

⁡

[

V
.

Sa

I
.

Sa

V
.

Ra

I
.

Ra

V
.

Sb

I
.

Sb

V
.

Rb

I
.

Rb

V
.

Sc

I
.

Sc

V
.

Rc

I
.

Rc
⁢

]

where,
{dot over (V)} S and İ S are the positive sequence voltage and current components of the first end;
{dot over (V)} R and İ R are the positive sequence voltage and current components of the second end;
{dot over (V)} Sa , {dot over (V)} Sb and {dot over (V)} Sc are the voltage phase vectors for each phase a,

Assignees

• General Electric Technology Gmbh

Inventors

• Ha Hengxu
• Na Deng

Classifications

• H02J2103/30

  Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks · CPC title

• H02J3/18 Primary

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

• H02J3/003

  Load forecast, e.g. methods or systems for forecasting future load demand · CPC title

• H02J3/00 Primary

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

• H02J2003/007

  Electricity · mapped topic