IEEE Power & Energy Magazine - September/October 2015 - 56

Multivendor PMU
Integration

figure 9. Angular spread of phasors in the All India grid.

the data due to the limited availability of applications.
However, an analysis of synchrophasor data with a SCADA
system is being done even with a limited number of PMUs.

A major challenge in using
PMU data for application development is IEEE C37.118
data formats, supporting both
integer and floating points.
Different vendors are using
different algorithms for phasor estimation and reporting
within the IEEE C37.118 standards provision. In turn, precision in the number of digits
after decimal points used by
different vendors for df/dt is
in the range of 3-10. POSOCO has installed PMUs
from multiple vendors.
An analysis of the rate of change of frequency (ROCOF),
as observed from three different vendors, is illustrated in
Figure 10. It can be observed that all three have a different
level of accuracy.

Implementation Experience
in a Multivendor System

Sync Error Due to Fraction of Second Drift

The IEEE C37.118 standard has been upgraded from the
2005 version to 2011, and the guide for PDCs has been
published, i.e., IEEE C37.244-2013. The equivalent International Electrotechnical Commission (IEC) standard, i.e.,
IEC 61850-90-5, is also picking up in the market, and with
most of the substation automation systems moving in this
direction, this standard is expected to gain more momentum. Under these situations the integration of PMUs with
different version of protocols becomes a challenge.

An interesting case found in one of the PMUs is a constant
drift in the fraction of second (FOS), due to which the quality of data was invalid. The time base in this PMU was noted
to be 1,000,000 (as per relevant standards). If a PMU is configured to report at 25 samples per second, then the FOS in
C37.118 data frame is expected to arrive as 0, 40,000, 80,000,
..., 920,000, 960,000 (25 values for 1 s). But the time coming
from the PMU was 30, 40,030, 80,030, 920,030, 960,030, having a constant drift of 30 μs.

0.05
Vendor 1 df/dt

Vendor 2 df/dt

Vendor 3 df/dt

ROCOF (Hz/s)

0.04
0.03
0.02
0.01
0

14:36:56.000
14:36:56.360
14:36:56.720
14:36:57.080
14:36:57.440
14:36:57.800
14:36:58.160
14:36:58.520
14:36:58.880
14:36:59.240
14:36:59.600
14:36:59.960
14:37:00.320
14:37:00.680
14:37:01.040
14:37:01.400
14:37:01.760
14:37:02.120
14:37:02.480
14:37:02.840
14:37:03.200
14:37:03.560
14:37:03.920
14:37:04.280
14:37:04.640
14:37:05.000
14:37:05.360
14:37:05.720
14:37:06.080
14:37:06.440
14:37:06.800
14:37:07.160
14:37:07.520
14:37:07.880
14:37:08.240
14:37:08.600
14:37:08.960
14:37:09.320
14:37:09.680
14:37:10.040
14:37:10.400
14:37:10.760
14:37:11.120
14:37:11.480
14:37:11.840
14:37:12.200
14:37:12.560
14:37:12.920
14:37:13.280
14:37:13.640
14:37:14.000
14:37:14.360
14:37:14.720

-0.01

figure 10. ROCOF from three different PMU vendors located in the western regional grid for tripping in the eastern regional grid.
56

ieee power & energy magazine

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
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