IEEE PES T&D Conference & Exposition 2022 - 102

statistical tool " power flicker " was used, the Pst was estimated
to be 2.91.
The second case is with a 1MVA shunt power quality
compensator performing flicker mitigation on the grid. These
results are shown in red in Figure 5. The flicker mitigation will
spread out spectral power that was concentrated at 2Hz among
higher frequencies out of the perceptible range and also reduce
the total voltage amplitude by a factor of approximately 35%.
When this voltage waveform was run through the MATLAB
flicker meter and extended to 10m, the Pst was estimated to be
10
0.98. Overall, in the HIL simulation, the compensator's flicker
mitigation was shown to theoretically reduce the short-term
flicker perceptibility factor by approximately 66%.
5
10.3
10.2
10.1
10
9.9
9.8
0.4
0.5
-5
-10
0.5
Time (s)
1
figure 4. Example of voltage fluctuation on a 60Hz waveform.
1.015
1.01
1.005
0.985
0.98
0.99
1
0.995
2
18
16
14
12
10
8
6
4
2
2
2.53 3.5
Time (s)
figure 5. HIL test case for flicker mitigation validation.
102
ieee power & energy magazine
2.53 3.5
Time (s)
4
Baseline
PQC With VLine Flicker Mit
Baseline
PQC With VLine Flicker Mit
4
Flicker Mitigation
Lab Validation
Once validated in simulation, software was tested in a laboratory
setup with two power quality compensator converters,
one acting as the device under test and the other as a load. To
test flicker mitigation, the load converter was placed into
a test mode configured to output a
sinusoidal reactive power command
with programmable amplitude
and frequency to reproduce
a flicker voltage waveform. With
a 100kvar peak-to-peak sinusoidal
reactive power command from the
load converter, the amplitude shift
in voltage was recorded with the
device under test in standby mode
and with flicker mitigation turned
on. The percent reduction in voltage
amplitude is used to calculate
how effective the flicker mitigation
was in the system.
This test was repeated over
a range of common flicker frequencies
(2-12Hz) with varying
control parameters to map out
optimal settings for any given
flicker mitigation application.
The results can be seen in Figure 6.
This test has shown that if the
specific frequency of the voltage
flicker in a problem area on the
grid can be determined, control
parameters can be optimized to
get the maximum mitigation possible
by installing a power quality
compensator system. If the flicker
frequency cannot be determined
or the voltage flicker manifests at
various frequencies, parameters
can be set so that a flat percentage
reduction across many frequencies
is possible while reducing
maximum mitigation over the frequency
range. In comparison to the
HIL simulation results, the voltage
amplitude percentage reduction
recorded in the laboratory test was
shown to have the same trending
along the frequency range with
only a slightly worse (~5%) performance
in mitigation.
0.6
0.7
Time (s)
0.8
0.9
1.5
4.5
5
4.5
5
April 2022 Show Issue
Pinst
Voltage (pu)
Line-to-Neutral Voltage (kV)
IEEE PES T&D Conference & Exposition 2022

Table of Contents for the Digital Edition of IEEE PES T&D Conference & Exposition 2022
