US 12,631,672 B2 · Method for identifying consumer phase connectivity in low-voltage distribution network based on voltage association characteristics

Abstract

A method for identifying consumer phase connectivity in low-voltage distribution network based on voltage association characteristics is provided. The specific steps thereof are: first, acquiring users to be identified and voltage time series data of three-phase buses on the low-voltage side of the low-voltage distribution network where the users to be identified are located; then, calculating voltage time series curve correlation coefficients among the users, and classifying a user having the maximum voltage time series curve correlation value with respect to the user into one category to form a user category set; then, based on the user classification, determining an initial consumer phase connectivity according to voltage association characteristics between the users and the three-phase buses on the low-voltage side of the low-voltage distribution network; finally, verifying the initial consumer phase connectivity according to the voltage association characteristics among the users to obtain a final consumer phase connectivity identification result.

A method for identifying consumer phase connectivity in low-voltage distribution network based on voltage association characteristics, comprising following steps:

step (1):
acquiring users to be identified and voltage time series data of three-phase buses on a low-voltage side of the low-voltage distribution network where the users to be identified are located;
step (2):
calculating voltage time series curve correlation coefficients among the users to be identified, and classifying a user having a maximum time series curve correlation value with respect to the user into one category, to form a user category set Ωcla,
step (3):
based on the user category set Ωcla, determining an initial consumer phase connectivity according to the voltage association characteristics between the users to be identified and the three-phase buses on the low-voltage side of the low-voltage distribution network;
and
step (4):
verifying the initial consumer phase connectivity according to the voltage association characteristics among the users to be identified, to obtain a final consumer phase connectivity identification result utilized in the low-voltage side of the low-voltage distribution network comprising electricity meters of the users to be identified,
wherein in the step (2), calculating the voltage time series correlation coefficients among the users to be identified, and classifying the user having the maximum voltage time series correlation value with respect to the user into one category to form the user category set Ωcla, comprises:
step (2-1):
calculating a matrix R of voltage curve correlation coefficients among the users to be identified comprised in a meter reading directory of the low-voltage distribution network, wherein elements in a u-th row of the matrix R is voltage time series curve correlation coefficients between a user u and all users;
R
=
[
r
11
…
…
…
…
r
1
⁢
M
⋮
⋱
⋮
⋮
r
uu
r
uv
⋮
⋮
r
vu
r
vv
⋮
⋮
⋱
⋮
r
M
⁢
1
…
…
…
…
r
MM
]
,
∀
u
,
v
∈
Θ
wherein r11, ruu, rvv and rMM respectively represent a voltage time series curve correlation coefficient between a user 1 and the user 1 itself, a voltage time series curve correlation coefficient between a user u and the user u itself, a voltage time series curve correlation coefficient between a user v and the user y itself and a voltage time series curve correlation coefficient between a user M and the user M itself, and are all 1;
r1M represents a voltage time series correlation coefficient between the user 1 and the user M:
rM1 represents a voltage time series correlation coefficient between the user M and the user 1;
M represents a total number of users comprised in the meter reading directory of the low-voltage distribution network;
Θ is the users comprised in the meter reading directory of the low-voltage distribution network;
ruv=rvu represents a voltage time series correlation coefficient between the user u and the user v, as formula below:
r
u
⁢
v
=
r
vu
=
∑
t
=
1
T
U
v
t
⁢
U
u
t
-
1
T
⁢
(
∑
t
=
1
T
U
u
t
⁢
∑
t
=
1
T
U
v
t
)
(
∑
t
=
1
T
U
v
t
⁢
2
-
1
T
⁢
(
∑
t
=
1
T
U
v
t
)
2
)
⁢
(
∑
t
=
1
T
U
u
t
⁢
2
-
1
T
⁢
(
∑
t
=
1
T
U
u
t
)
2
)
wherein in the formula,
U
u
_
t
_
and
U
v
_
t
_
respectively are voltage values of the user u and the user v at time t, u and v∈Θ, t=1, 2, . . . , T,
wherein in the step (3), based on the user category set Ωcla, determining the initial consumer phase connectivity according to voltage association characteristics between the users to be identified and the three-phase buses on the low-voltage side of the low-voltage distribution network, comprises:
step (3-1):
calculating an average value of a voltage of each user, as formula below,
U
a
⁢
v
⁢
e
u
=
(
∑
t
=
1
T
U
u
t
)
/
T
wherein in the formula,
U
u
_
ave
_
-
is an average value of a voltage of the user u over a measurement period T;
U
u
_
t
_
is a value of a voltage of a user u at time t, t=1, 2 . . . , T, and
for the user category set Ωcla, extracting a user having the maximum voltage average value in each classification to constitute a user set ξ, and at this time, an element in ξ being the user closest to a head end in each classification;
step (3-2):
calculating a voltage time series curve correlation coefficient between each user in ξ and the three-phase buses on the low-voltage side of the low-voltage distribution network, to obtain a matrix R1,
R
1
=
[
r
A
,
ξ
⁡
(
1
)
…
r
A
,
ξ
⁡
(
h
)
…
r
A
,
ξ
⁡
(
N
)
r
B
,
ξ
⁡
(
1
)
…
r
B
,
ξ
⁡
(
h
)
…
r
B
,
ξ
⁡
(
N
)
r
C
,
ξ
⁡
(
1
)
…
r
C
,
ξ
⁡
(
h
)
…
r
C
,
ξ
⁡
(
N
)
]
wherein in the matrix R1, rA, ξ(h), rB, ξ(h) and rC, ξ(h) are respectively voltage time series curve correlation coefficients between an h-th user in the set ξ and bus of phase A on the low-voltage side of the low-voltage distribution network, between the h-th user in the set ξ and bus of phase B on the low-voltage side of the low-voltage distribution network, and between the h-th user in the set ξ and bus of phase C on the low-voltage side of the low-voltage distribution network, and rA, ξ(N), rB, ξ(N) and rC, ξ(N) are respectively voltage time series curve correlation coefficients between an N-th user in the set ξ and bus of phase A of three-phase on the low-voltage side of the low-voltage distribution network, between the N-th user in the set ξ and bus of phase B of three-phase on the low-voltage side of the low-voltage distribution network, and between the N-th user in the set ξ and bus of phase C of three-phase on the low-voltage side of the low-voltage distribution network, wherein h<N,
wherein in the step (4), verifying the initial consumer phase connectivity according to the voltage association characteristics among the users to be identified, to obtain the final consumer phase connectivity identification result, comprises:
step (4-4):
setting a second threshold coefficient τ1;
if in an initial consumer phase connectivity result, previous τ1 users having a maximum correlation coefficient of a voltage curve with respect to a certain user in a set χ1 is not in a same phase with the certain user, listing the user as an initial suspicious user, and adding the initial suspicious user into an initial suspicious user set χ2;
step (4-5):
in the initial suspicious user set χ2, if the user having the maximum correlation of the voltage curve with respect to the certain user is not in the same phase with the certain user, determining the user to be an out-of-phase user;
if the user having the maximum correlation with respect to the certain user also belongs to the initial suspicious user set χ2, listing the user in a suspicious user set χ3;
step (4-6):
in the suspicious user set χ3, if the user having the maximum correlation of the voltage curve with respect to the certain user also belongs to the suspicious user set χ3, determining the user to be the out-of-phase user;
and
step (4-7):
for the out-of-phase users in the step (4-5) and the step (4-6), updating phase sequences of the out-of-phase users to be phase sequences of a first user in the previous τ1 users whose phase sequences are different from the phase sequences of the out-of-phase users to obtain the final consumer phase connectivity identification result, and ending the identification, and utilizing the final consumer phase connectivity identification result to change the users to be identified having incorrect phase electricity meters.

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Method for identifying consumer phase connectivity in low-voltage distribution network based on voltage association characteristics

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Method for identifying consumer phase connectivity in low-voltage distribution network based on voltage association characteristics

Life of this patent

Abstract

Claims7