Static voltage stability margin evaluation method and system, and terminal device

Patent metadata

Field	Value
Publication number	US-2025094663-A1
Application number	US-202318559292-A
Country	US
Kind code	A1
Filing date	Mar 13, 2023
Priority date	Feb 9, 2023
Publication date	Mar 20, 2025
Grant date	—

Abstract

A static voltage stability margin evaluation method and system, and a terminal device are related to the field of integrated energy system operation. The method includes the following steps: establishing a thermal dynamic model of a heating system; establishing a thermoelectric coupling device model; establishing a static voltage stability margin model of an electric power system that considers thermal dynamics of the heating system; and solving the model to obtain a voltage stability margin. In the present invention, a static voltage stability margin that considers thermal dynamics of a heating system can be obtained, and a Pareto boundary of the static voltage stability margin that considers the thermal dynamics can be obtained through a dual-objective nonlinear optimization method, so that an impact of thermoelectric coupling on voltage stability and an impact of thermal inertia of the heating system on a voltage stability margin can be revealed.

First claim

1 . A static voltage stability margin evaluation method, comprising:
establishing a thermal dynamic model of a heating system based on temperature transmission of a heating network pipe and thermal dynamics of a building; establishing a thermoelectric coupling device model based on operation and a coupling constraint of a thermoelectric coupling device; establishing, based on an electric load growth mode and a thermal load growth mode, a static voltage stability margin model:
max(λ E ,λ H )

s.t. g E ( P,Q,V,θ,λ E )≤0

g H ( H,T,m,λ H )≤0

g EH ( P,H )≤0

wherein λ E and λ H are respectively an electric load coefficient and a thermal load coefficient; P and Q are respectively active/reactive power of an electric generator or a branch; V and θ are respectively a voltage and a phase of a bus; H is thermal energy; T is a water temperature or a room temperature; m is a mass flow rate; and g E (⋅)≤0, g H (⋅)≤0, and g EH (⋅)≤0 are respectively constraints of an electric power system, the heating system, and a thermoelectric coupling relationship; and solving the static voltage stability margin model to obtain a voltage stability margin.

2 . The static voltage stability margin evaluation method according to claim 1 , wherein the establishing, based on an electric load growth mode and a thermal load growth mode, a static voltage stability margin model further comprises the following steps:
establishing an electric load growth mode model:

P

L
,

c
1

i
,
t

=

(

1
+

λ
E

)

⁢

P

L
·

c
0

i
,
t

,

Q

L
,

c
1

i
,
t

=

(

1
+

λ
E

)

⁢

Q

L
·

c
0

i
,
t

wherein P L,c 0 i,t and P L,c 1 i,t are respectively active power of a current operating point and a safety limit point; Q L,c 0 i,t and Q L,c 1 i,t are respectively reactive power of the current operating point and the safety limit point; and λ E is the electric load coefficient;
establishing a thermal load growth mode model:

H

L
,

c
1

k
,
t

=

(

1
+

λ
H

)

⁢

H

L
·

c
0

k
,
t

wherein H L,c 0 k,t and H L,c 1 k,t are respectively thermal loads at the current operating point and the safety limit point; and λ H is the thermal load coefficient;
establishing a hydraulic regulation strategy model:

m

p
,

c
1

j

=

{

(

1
+

λ
H

)

⁢

m

p
,

c
0

j

,

if
⁢

(

1
+

λ
H

)

⁢

m

p
,

Assignees

• Univ Southeast

Inventors

• Lu Shuai
• Li Yuan
• Gu Wei
• Xu Yijun
• Ding Shixing
• Yu Ruizhi

Classifications

• H02J2103/30

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

• G06F2119/08

  Thermal analysis or thermal optimisation · CPC title

• H02J3/00

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

• H05B1/0275

  Heating of spaces, e.g. rooms, wardrobes · CPC title

• G06F30/20 Primary

  Design optimisation, verification or simulation (optimisation, verification or simulation of circuit designs G06F30/30) · CPC title