Voltage stability monitoring in power systems

Patent metadata

Field	Value
Publication number	US-9876352-B2
Application number	US-201414189950-A
Country	US
Kind code	B2
Filing date	Feb 25, 2014
Priority date	Feb 26, 2013
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

Systems and methods for voltage stability monitoring in power systems are disclosed herein. In one embodiment, a method includes receiving data representing a set of system parameters of a power system having one or more power buses under a load condition. The method also includes estimating one or more sets of the system parameters under one or more additional load conditions based on the received data and topology information of the power system. The method further includes determining a voltage stability index for the power system based on both the received set of system parameters and the estimated one or more sets of the system parameters.

First claim

We claim:

1. A computing system, comprising:
a processor;
a memory operatively coupled to the processor, the memory containing instructions that when executed by the processor cause the processor to perform a process including:
receiving data, via a computer network, from phasor measurement units located at corresponding power buses in a power system, the received data representing a set of system parameters of the power system under a load condition, the set of system parameters including a voltage magnitude and a voltage angle of the individual power buses in the power system;
estimating one or more additional sets of the system parameters under one or more additional load conditions different than the load condition based on the received data representing the set of system parameters and topology information of the power system, the topology information including connectivity information between pairs of the power buses in the power system, wherein the one or more additional sets of the system parameters each include another voltage magnitude and another voltage angle of the individual power buses in the power system under one of the additional load conditions;
determining a real-time voltage stability index for the power system based on both the received set and the estimated one or more sets of the system parameters; and
raising an alarm for potential voltage collapse in the power system when the determined real-time voltage stability index is above a preset threshold,
wherein estimating one or more additional sets of system parameters includes:

selecting one or more power perturbations (Delta) as follows:

Delta
=

[

[

Δ
⁢

⁢
PL

]

[

Δ
⁢

⁢
QL

]

]

[

(

2
×
Total
⁢

⁢

No
.

⁢
of

⁢

⁢
buses

)

-

(

No
.

⁢
of

⁢

⁢
generator
⁢

⁢
buses

)

-
2

]

where ΔPL is real power perturbation and ΔQL is reactive power perturbation; and calculating the one or more set of system parameters as follows:

[

[

Δ
⁢

⁢
VL
⁢

⁢
1

]

[

Δδ
⁢

⁢
L
⁢

⁢
1

]

]

=

[

[

∂
P

∂
δ

]

[

∂
P

∂


V


]

[

∂
Q

∂
δ

Assignees

• Univ Washington State

Inventors

• Biswas Saugata Swapan
• Srivastava Anurag K

Classifications

• H02J2103/30

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

• H02J13/333

  the equipment forming part of substations · CPC title

• H02J13/12

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• H02J13/10

  characterised by displaying of information or by user interaction, e.g. supervisory control and data acquisition [SCADA] systems · CPC title

• H02J3/06

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