Method and device for controlling active distribution network

Patent metadata

Field	Value
Publication number	US-10291027-B2
Application number	US-201615015225-A
Country	US
Kind code	B2
Filing date	Feb 4, 2016
Priority date	Nov 6, 2015
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

The present disclosure provides a method and a device for controlling an active distribution network, relating to the field of power system operation and control technology. The method includes: creating a power loss objective function; determining first power flow equations; obtaining second power flow equations by performing linearization on the first power flow equations; determining a sub-scale adjustment model of a transformer; obtaining a linearized model of the transformer by performing linearization on the sub-scale adjustment model; obtaining control parameters by solving the power loss objective function according to the second power flow equations, the linearized model of the transformer, an operation constraint of the continuous reactive power compensator, an operation constraint of the grouping switching capacitor, an operation constraint of the distributed generator and a safety operation constraint in the active distribution network, such that the active distribution network is controlled by the obtained parameters to minimize power loss.

First claim

What is claimed is:

1. A method for controlling an active distribution network, comprising:
creating a power loss objective function for power flow of the active distribution network, wherein, the power loss objective function is a minimizing function of power loss of the active distribution network, the active distribution network comprises nodes, branches with the transformer and branches without the transformer;
determining first power flow equations for the active distribution network;
obtaining second power flow equations by performing linearization on the first power flow equations;
determining a sub-scale adjustment model of a transformer in the active distribution network;
obtaining a linearized model of the transformer by performing linearization on the sub-scale adjustment model; and
obtaining a three-phase active power and a three-phase reactive power of a distributed generator, a three-phase reactive power of a continuous reactive power compensator, a three-phase reactive power of a grouping switching capacitor, and an adjustable tap position of the transformer in the active distribution network by solving the power loss objective function according to the second power flow equations, the linearized model of the transformer, an operation constraint of the continuous reactive power compensator, an operation constraint of the grouping switching capacitor, an operation constraint of the distributed generator and a safety operation constraint in the active distribution network, wherein the active distribution network is controlled by the obtained three-phase active power and a three-phase reactive power of a distributed generator, the three-phase reactive power of a continuous reactive power compensator, the three-phase reactive power of a grouping switching capacitor, and the adjustable tap position of the transformer in the active distribution network to minimize power loss, the controlling causes precise adjustment of tap position of the transformer
wherein, the first power flow equations comprises a three-phase branch-type flow equation for each node, a three-phase branch-type flow equation for each branch with the transformer, and a three-phase branch-type flow equation for each branch without the transformer;
wherein, the three-phase branch-type flow equation for a node j is denoted by formulas of

∑

i
∈

Φ
⁡

(
j
)

⁢

⁢

(

P
ij
φ

-

P
ij
φ2

+

Q
ij
φ2

V
i
φ2

⁢

R
ij
φ

)

+

P
j
φ

=
0

(
1
)

and

∑

i
∈

Φ
⁡

(
j
)

⁢

⁢

(

Q
ij
φ

-

P
ij
φ2

+

Q
ij
φ2

V
i
φ2

⁢

X
ij
φ

)

+

Q
ij
φ

=
0

(
2
)

where, Φ(j) represents a node-set composed by nodes connected to the node j, i represents a node non-identical to the node j and belonging to Φ(j), ij represents a branch with the transformer and h

Assignees

• Univ Tsinghua

Inventors

• Wu Wenchuan
• Zhang Boming
• Sun Hongbin
• Tian Zhuang
• Guo Qinglai
• Wang Bin

Classifications

• H02J2103/30

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

• H02J3/50

  Controlling the sharing of reactive power · CPC title

• H02J3/1878

  using tap changing or phase shifting transformers · CPC title

• H02J3/1828

  with stepwise control, e.g. switched capacitor banks · CPC title

• H02J3/06

  Controlling the transfer of power between connected networks; Controlling load sharing between connected networks · CPC title