Method for determining integrated network loss rate in UHV AC cross-regional electricity trading

Patent metadata

Field	Value
Publication number	US-10580096-B2
Application number	US-201615151907-A
Country	US
Kind code	B2
Filing date	May 11, 2016
Priority date	Dec 18, 2013
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

The invention relates to a method for determining an integrated network loss rate in the UHV AC cross-regional electricity trading. The method includes fitting a curve relationship between integrated network loss rates and transmitting powers on the basis of theoretical calculations of the UHV AC transmission line loss, using a relational fitted curve between actual values of integrated network loss rates and transmitting powers calculated according to gateway power statistical data to perform geometrical average correction on the original curve, and making planned values of the integrated network loss rates to be closer to the actual values according to a method for determining UHV AC integrated network loss rates according to a correction curve function relation, which greatly increases fairness of the trading settlement. The method is simple and easy to implement with high accuracy, and applicable to planning and trading settlement of regular or real-time UHV AC electricity trading.

First claim

What is claimed is:

1. A method for determining an integrated network loss rate in ultra-high voltage (UHV) AC cross-regional electricity trading, comprising:
(a) obtaining a theoretical calculation value η theoretical of an integrated network loss rate corresponding to different transmitting powers of an UHV AC line, according to a formula of:

η
theoretical

=

Δ
⁢

⁢

P
R

+

Δ
⁢

⁢

P
C

+

Δ
⁢

⁢

P
T

P

 wherein P is an UHV AC transmitting power, ΔP R is a resistive loss of the UHV AC line, ΔP T , is an energy loss for a main transformer of a UHV AC system; ΔP C is a corona loss of the UHV AC line;
(b) curve-fitting different transmitting powers of the UHV AC line and the corresponding theoretical calculation values η theoretical of integrated network loss rates by using the least square method in a rectangular coordinate system where the abscissa is the UHV AC transmitting power and the ordinate is the integrated network loss rate, to obtain a fitted curve η 1 (P)=a 0 +b 0 ×P+c 0 ×P 2 of relationships between the theoretical calculation values of UHV AC integrated network loss rates and transmitting powers;
(c) according to gateway power statistical data, determining an average transmitting power within respective different-duration time periods of the UHV AC system and calculating an actual calculation value η actual of the corresponding integrated network loss rate in each time period, according to a formula of:

η
actual

=

Δ
⁢

⁢
Q

Q

=

∑
i

⁢

SQ
i

⁡

(
+
)

+

∑
i

⁢

RQ
i

⁡

(
-
)

∑
i

⁢

SQ
i

⁡

(
+
)

 wherein ΔQ is the total network loss power of the UHV AC system in each time period, Q is the total power-giving of the UHV AC system in the time period;

∑
i

⁢

SQ
i

 is the sum of power-giving of pressure-side gateways in all UHV main transformers in the time period, and

∑
i

⁢

RQ
i

 is the sum of power-receiving of the pressure-side gateways in all UHV main transformers in the time period;
(d) curve-fitting the UHV AC average transmitting powers and the corresponding actual calculation values actual of η actual integrated network loss rates by using the least square method in a rectangular coordinate system where the abscissa is the UHV AC transmitting power and the ordinate is the integrated network loss rate, to obtain a fitted curve η 2 (P)=a 1 +b 1 ×P+c 1 ×P 2 of relations between the actual calculation values of UHV AC integrated network loss rates and transmitting powers;
(e) selecting n+1 points, [P 1 , η 1 (P 1 )], [P 2 ,η 1 (P 2 )] . . . [P i , η 1 (P i )], . . . [P n+1 , η 1 (P n+1 )], from the fitted curve of relations between the theoretical calculation values of UHV AC integrated network loss rates and transmitting powers, wherein P 1 is the minimum transmitting power of the UHV AC line, P n+1 is the maximum transmitting power of the UHV AC line,

P
i

=

P
1

+

(

P

n
+
1

-

P
1

)

×

(

i
-
1

)

n

,

 i=1, 2, . . . , n, n+1; then selecting n+1 points with the same abscissa, [P 1 , η 2 (P 1 )], [P 2 , η 2 (P 2 )] . . . [P i , η 2 (P i )], . . . [P n−1 , η 2 (P n+1 )], from the fitted curve of relati

Assignees

• State Grid Corp China
• Economic & Tech Research Institute Of Hubei Electric Power Company
• State Grid Corporation Of China Economic & Tech Research
• Inst Of Hubei Electric Power Company

Inventors

• Hu Ting
• Zhang Yinya
• Yang Dongjun
• Bai Shunming
• Xu Jingyou
• Xiao Daqiang
• Wei Cong

Classifications

• Y04S50/10

  Energy trading, including energy flowing from end-user application to grid · CPC title

• H02J3/00

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

• G06Q50/06 Primary

  Energy or water supply · CPC title

• G06Q30/06

  Buying, selling or leasing transactions · CPC title

• G06F17/18

  for evaluating statistical data {, e.g. average values, frequency distributions, probability functions, regression analysis (forecasting specially adapted for a specific administrative, business or logistic context G06Q10/04)} · CPC title