Wide Area Monitoring System

steamgloomyElectronics - Devices

Nov 15, 2013 (3 years and 8 months ago)

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Suphot Jitlikhit

Head in, Power System Analysis Section 1
Control
& Protection
Division
Electricity
Generating Authority of
Thailand

December
8, 2010
EGAT, Thailand


Application of
Phasor

Measurement Units and
Wide Area Monitoring System of EGAT’s Network

and Trend for Smart Grid

Smart Grid and Diagnostics

2

Contents



WAMS

&

PMU

history

in

EGAT’s

network


Phasor

vs
.

SCADA

Comparison


SCADA

vs
.

PMU

Measurement


Example

for

Real

time

Application


Benefits

of

using

PMU

in

EGAT

&Trend

to

Smart

Grid


Conclusion

WAMS & PMU

3

Wide Area Monitoring (WAMS) :
use GPS Satellite

Wide

Area

Monitoring

System

use

a

GPS

satellite

signal

to

time
-
synchronize

from

phasor

measurement

units

(PMUs)

at

important

nodes

in

the

power

system,

send

real
-
time

phasor

(angle

and

magnitude)

data

to

a

Control

Centre
.



The

acquired

phasor

data

provides

dynamic

information

on

power

systems,

which

helps

operators

to

initiate

corrective

actions

to

enhance

the

power

system

reliability
.

GPS satellite

PMU

PMU

PMU

PMU

WAMS & PMU

4

Installation of PMUs

at critical nodes

in Power Systems.

GPS synchronized current

and voltage
phasor

measurement.

Time resolution: <

10

6

s

Measurement quality: 0.1%
of U and I

and Angle accuracy

of
< +/
-

0.05%

Wide Area Monitoring (WAMS) :
System Configuration

High precision data acquisition

WAMS & PMU

5

Wide Area Monitoring (WAMS) :
Project in 2005

EGAT installation Wide Area Monitoring (WAMS)


Inter
-
area

oscillation

on

the

tie

transmission

line

between

the

Central

system

and

the

Southern

system

is

one

of

the

important

problems

which

lead

to

reduce

stability

and

security

of

the

transmission

system
.


To

prevent

system

from

inter
-
area

oscillation,

Wide

Area

Monitoring

System

(WAMS)

was

installed

at

the

Central

system

and

the

Southern

system

in

2005

to

monitor

the

stability

of

this

power

transmission

network
.

WAMS & PMU

Bottleneck

in

transmission

corridor
:


Limit

due

to

concerns

about

power

oscillation

,

the

origin,

amplitude,

frequency,

usual

duration

and

damping

of

oscillation

are

not

know


6

Wide Area Monitoring (WAMS) :
Power
Oscillation Monitoring

Bang Saphan

Central
-
South power corridor

Surat Thani

WAMS & PMU

7

Wide Area Monitoring (WAMS) : PMU
Installation

EGAT installation Wide Area Monitoring (WAMS)


Phasors

Monitoring

Units

(PMUs)

are

installed

at

Bang

Saphan

and

Surathani

Substation

and

use

a

GPS

satellite

signal

to

time
-
synchronize

voltage

and

current

readings

as

they

are

taken

from

both

substations
.

Data

can

be

streamed

into

a

Control

Center

from

far
-
flung

points

in

the

grid,

where

it

is

evaluated

to

give

grid

operators

a

precise

picture

of

what

is

happening

in

their

system,

online
.

They

can

also

finally

see

what

is

happening

beyond

their

own

control

area



an

advance

over

traditional

monitoring

and

protection

methods
.

WAMS & PMU

WAMS

Benefit
:


Detect

of

oscillation,

Assessment

of

power

system

damping,

Oscillation

Monitoring,

Increase

power

transfer

at

defined

security,

and

Early

warning

to

avoid

power

system

collapse
.


8

Wide Area Monitoring (WAMS) :
Schematic Diagram

WAMS & PMU

9

The project has upgraded from the existing of Digital Fault Recorder (DFR),
totally 6 sites and 14 PMUs installed.

This is as the pilot project to test the function of PMU on DFR platform.

Phasor

Data Concentrator (PDC) and its software application has been
installed in the server and its display available at the operator console for
visualization.

This project has only used for monitoring purpose and observe the system in
broader scale..

Wide Area Monitoring (WAMS)
:
Project in 2010

WAMS & PMU

10

Wide Area Monitoring (WAMS) :
Phasor

vs. SCADA Comparison

WAMS & PMU

11

Wide Area Monitoring (WAMS) : SCADA vs. PMU Measurement

WAMS & PMU

PMU

is

the

higher

time
-
resolution

providing

about

power

system

dynamics

in

comparison

with

SCADA/EMS

12

Wide Area Monitoring (WAMS) : Example for Real time Application



Phase

Angle

Monitoring


Voltage

Stability

Monitoring


Power

Oscillation

Monitoring

WAMS & PMU

13

WAMS Application Example: Phase Angle Monitoring

WAMS & PMU

Benefits
:


Provide

operator

with

real

time

information

about

voltage

phase

angle

deviation,

Improve

voltage

control,

improve

system

stability,

security

and

reliability

,

and

operate

safety

carrying

components

closer

to

their

limit
.

14

WAMS Application Example: Voltage Stability Monitoring

PMU & WAMS

14

Early warning

Emergency alarm

Normal Operation

WAMS & PMU

Benefit
:


Early

warning

against

voltage

collapses,

Immediate

stop

of

cascading

effects,

and

Protection

against

uprising

voltage

instabilities
.

15

WAMS Application Example: Power Oscillation Monitoring

EGAT

System Status:

Normal, Warning and Alarm

WAMS & PMU

WAMS

Benefit
:


Detection

of

oscillation,

Assessment

of

power

system

damping,

Increase

power

transfer

at

defined

security,

and

Early

warning

to

avoid

power

system

collapse
.

16

Benefit of Using PMU in EGAT & Trend for Smart Grid



Real

time

monitoring


Post
-
disturbance

analysis


Adaptive

protection


Power

system

restoration

WAMS & PMU

Goal & Benefits

Source: Dr. Luigi
Vanfretti
, KTH Sweden

17

Benefit of Using PMU in EGAT &Trend Smart Grid: Real time
monitoring

17


T
o provide operators with real
time knowledge of system
conditions

Goal



Improve calculation for real



time path flow and optimal


dispatch



Provide actual limits of the


system instead of the


conservative ones from


offline calculations

Benefits of using PMU

WAMS & PMU

18

Benefit of Using PMU in EGAT & Trend for Smart Grid: Post Disturbance
Analysis


To reconstruct the sequence of events after disturbance has
occurred

Goal

Benefits of using PMU



Easier to understand sequence of events when using


synchronized data from PMU

WAMS & PMU

19

Benefit of Using PMU in
EGAT&Trend

for Smart Grid: Adaptive Protection


Adapt protection to be appropriate with system condition

Goal

Benefits of using PMU



Improved backup protection



Adaptive protection setting


to avoid cascading outage


WAMS & PMU

20

Benefit of Using PMU in
EGAT&Trend

for Smart Grid: Power System Restoration


Assist system operator during restoration with data from PMU

Goal

Benefits of using PMU



System operator have more confidence during restoration



Reduce chance of recurrence of system outage



Reduce time needed for a system restoration

WAMS & PMU

21

Benefit of Using PMU in
EGAT&Trend

for Smart Grid: Smart Transmission Grid

WAMS & PMU

22

Conclusion



EGAT has installed WAMS & PMU since 2005, for monitoring


and resolution of power oscillation problem between Central and


Southern region. In 2010, more project has installed for visualization of


power system in broader scale.



The capabilities of PMU for high precision, speed of response and


GPS time synchronization make PMU very appropriate for wide


area monitoring for protection and control.




An Advanced early warning technology for power grids that helps


operators to ensure grid reliability by detecting and counteracting the


first signs of grid instability.





Trend
for the Smart Grid for the future.

WAMS & PMU