WIDE AREA MONITORING SYSTEM

1. 1
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

2. 2
Installation of PMUs
at critical nodes
in Power Systems.
GPS synchronized current
and voltage phasor measurement.
Time resolution: <10–6s
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

3. 3
Wide Area Monitoring (WAMS) : Phasor vs. SCADA Comparison
WAMS & PMU

4. 4
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

5. PMUs and the Smart Grid
Phasor Measurement Units (PMUs) Provide
Synchronized, Wide-Area Power Measurements
• PMUs provide the Magnitude and Angle of all power
measurements at all grid locations simultaneously
• Measurements are available as frequently
as 30 times each second

6. Function of Distribution Automation System
Remotely monitors the distribution system,
facilitates supervisory control of devices and
provides decision support tools to improve the
system performance
• SCADA
(Supervisory Control And Data Acquisition)
• Application Functions

7. What is Distribution Automation ?
• “A set of technologies that enable an electric utility to remotely monitor, coordinate and operate
distribution components in a real-time mode from remote locations” - (IEEE definition)
• DA is an umbrella concept that embraces all the other real-time and operational functions
for the distribution network
Distribution Management (DMS)
Meter
Reading
(AMR)
Substation
Automation (SA)
Feeder
Automation (FA)