IEEE Power & Energy Magazine - September/October 2015 - 54

Jammu and Kashmir

Vindhyachal HVDC
400 kV Kanpur
Dadri HVDC

Kishenpur
Himachal Pradesh
Karcham
Wangtoo

400 kV Agra
400 kV Bassi
400 kV Hisar
400 kV Moga

Moga

400 kV Kishenpur

Punjab

400 kV Karcham Wangtoo
Uttarkhand

Hisar

PDC Location
NRLDC, New Delhi

Dadri
Uttar

Pradesh

Bassi
Bihar

Agra
Rajasthan

Eastern
Region

Kanpur

Gujrat
Madhya Pradesh
Western Region

Vindhyachal

figure 7. The geographical location of PMUs and PDCs in the northern region in India.

An analysis revealed that the plot of the angular separation could be used to detect major grid events within the same
region or in neighboring regions, detect islands, and tag exceptional grid operating conditions such as load crash. It was evident that the angular separation could provide valuable insight
into the health of the synchronous interconnection.

WAMS Pilot Projects in India
PMUs can measure the magnitude and angle of the power
system buses The network of PMUs called wide-area monitoring systems (WAMS) can provide the data to the control center at a fast rate. Thus, several WAMS pilot projects
were carried out in India. The first one was in the northern
region in 2010. Eight PMUs and one phasor data concentrator (PDC) were installed in two stages. The pilot project was
completed by 31 May 2010, as shown in Figures 6 and 7.
In the control room, the synchrophasor data has helped in
improving and enhancing the situational awareness through
the real-time monitoring of frequency, df/dt, angular separa54

ieee power & energy magazine

tion, and voltage. This data helped in identifying the occurrence of transmission line tripping and revival within a flow
gate by observing the step change in angular separation, step
in voltage magnitude, and in line current (MW and MVAR).
The operators also recognized the occurrence of generator
tripping by observing the frequency decline, an increase in
df/dt, a change in angular separation, and a decrease in voltage magnitude. By tracking the sustained high-frequency
abnormal phase-angle separation and high voltage, the load
crash/load throw off could be detected. It also helped in subsystem synchronization during restoration by using standing
phase-angle separation and phase sequences. These studies
have yielded encouraging results and have ushered the transition from "state estimation" to "state measurements" in the
Indian power system. The current deployment of PMUs in
India is shown in Figure 8.
The immediate effects of the WAMS initiative include
✔ dramatically raised visualization and the level of understanding of the power system
september/october 2015



Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - September/October 2015

IEEE Power & Energy Magazine - September/October 2015 - Cover1
IEEE Power & Energy Magazine - September/October 2015 - Cover2
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IEEE Power & Energy Magazine - September/October 2015 - Cover3
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