Long, short and multi-timescale voltage regulation method based on source-grid-load- storage multi-terminal collaboration of power distribution network

Patent metadata

Field	Value
Publication number	US-11990756-B2
Application number	US-202217998039-A
Country	US
Kind code	B2
Filing date	Jan 5, 2022
Priority date	Jul 23, 2021
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A multi-timescale voltage regulation method based on source-grid-load-storage multi -terminal collaboration of a power distribution network is disclosed, which comprises: establishing, based on a Petri network, a multi-mode switching control model based on voltage security event trigger to realize effective control of a global voltage; establishing multi-objective optimization taking into account a source-storage-load regulation cost and a network transmission loss to realize collaborative and dynamic control of controllable resources of a source terminal, a load terminal and a storage terminal in each operating mode; and establishing a source-storage-load multi-terminal collaboration-based distributed voltage control model based on voltage security event trigger over a short timescale by taking into account the problems of voltage magnitude being out of limit and voltage leap, and solving online an optimal control sequence of the source terminal, the load terminal and the storage terminal in a receding horizon.

First claim

What is claimed is:

1. A long-timescale voltage regulation method based on source-grid-load-storage multi-terminal collaboration of a power distribution network, comprising:
acquiring a multi-mode switching control model based on voltage security event trigger of feeders of an active power distribution network; and
establishing multi-objective optimization taking into account a source-storage-load regulation cost and a network transmission loss in each operating mode according to the multi-mode switching control model based on voltage security event trigger, to obtain optimal power values of a source terminal, a load terminal and a storage terminal over a long timescale;
wherein a construction process of the multi-mode switching control model based on voltage security event trigger comprises:
establishing the multi-mode switching control model, which is composed of a septimal tuple (P, T, A, F − , F + , T M , M 0 ), of the feeders of the active power distribution network based on a Petri network, where:
P={P 1 , P 2 , . . . , P n },
T={T 1 , T 2 , . . . , T 2n−2 },
A =( P⊗T )∪( T⊗P ),

T M ={ΔT 1 , ΔT 2 , . . . , ΔT 2n−2 }  (1)

in formula (1), P is a set of discrete places, and P i , iϵ{1,2, . . . n} is discrete places and represents operating modes of the active power distribution network; n is a total number of voltage regulator taps; T is a set of all discrete transitions; A is a set of all arcs, the modes are connected to the corresponding transitions through the directed arcs in A, and these directed arcs are associated with predecessor arcs defined in F − or successor arcs defined in F + respectively, and ⊗ is a Cartesian product; F − is a set of the predecessor arcs; F + is a set of the successor arcs; T M represents a set of discrete transition switching times; M 0 represents a set of all initial mode marks;
the discrete transition T i , iϵ{1,2,2n−2} is triggered by a voltage security event designed as follows:
if t=t 0 and V rm (t) falls to
V rm ( t ) < V ref - V db 2 , ETSC( T i )= S ( t−t 0 )− S ( t−t 0 −ΔT i ), i ϵ{1,2 , . . . n −1}  (2)

if t=t 0 and V rm (t) rises to
V rm ( t ) > V ref + V db 2 , ETSC( T i )= S ( t−t 0 )− S ( t−t 0 −ΔT n−2+i ), i ϵ{2,3 , . . . n −1}  (3)

formula (2) indicates that the discrete transition T i , i=1,2,n−1 is triggered when V rm (t) falls to a lower threshold

V
ref

-

V
db

2

and DT i time later, the operating mode is switched from P i to P i+1 ; formula (3) indicates that T n−2+i , i=2,3,L n is triggered when V rm (t) rises to an upper threshold

V
ref

+

V
db

2

⁢

and
⁢

DT

n
-
2
+
i

time later, the operating mode is switched from P i to P i−1 ; where, ETSC(T i ) is a trigger function of the discrete transition T i , V ref a voltage reference value, V db is a voltage error dead zone, and V rm (t) is a moving average of a secondary voltage of a voltage regulator, which is specifically expressed as:

V
rm

(
t
)

=

{

∑

τ
=
1

t

⁢

V
(
τ
)

/
t

,

t
≤
N

∑

τ
=

t
-
N
+
1

t

⁢

V
(
τ
)

/
N

,

t
>
N

(
4
)

in formula (4), N is a length of a sliding time window, V(τ) is the secondary voltage of the voltage regulator at a time τ, and t represents a present time; in formula (2) and formula (3), a step function S(t−t 0 ) is expressed as:

S
⁡
(

Assignees

• Univ Nanjing Posts & Telecommunications
• State Grid Electric Power Res Inst

Inventors

• Yue Dong
• Dou Chunxia
• Zhang Zhijun
• Ding Xiaohua
• Luo Jianbo
• Li Yanman
• Huang Kun
• Han Tao

Classifications

• H02J2103/30

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

• H02J2101/24

  Photovoltaics · CPC title

• H02J2101/28

  Wind energy · CPC title

• H02J3/28 Primary

  Arrangements for balancing of the load in networks by storage of energy · CPC title

• H02J2203/20

  Electricity · mapped topic