Seminar power point presentation

1. ADAMA SCIENCE AND TECHNOLOGY
UNIVERSITY
Optimal Placement of D-STATCOM for Reduction of
Power Loss and Improvement of Voltage Profile using
Power Stability and Power Loss Indices in a Radial
Distribution System
Publisher: IEEE
Published in 2019
By Helen Tsegay
ID NO: PGR/21840/13

2. Presentation Outlines
Introduction
Power loss index
Power stability index
Result and discussion
Conclusion

3. In the last few years, the distribution system has needed more
attention due to its significant role in power quality and planning.
 Voltage sag, voltage instability and voltage fluctuation are common
issues in distribution system.
 These lead to increase in losses, slow response time and
decrease in power flow.
 Power loss reduction is a major issue that needs to be addressed
from the consumer point of view to improve the overall efficiency
of power delivery.
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INTRODUCTION

4.  Shunt capacitors and series voltage regulator are used for
resolving these issues and maintaining the voltages within stability
limits.
 But these have certain limitations like delayed response time,
inability of generation of continuous reactive power, presence of
oscillations in inductive circuits, etc.
 To overcome these issues, FACTS devices are extensively being
used nowadays.
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Cont…

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Fig.1: Block diagram of DSTATCOM.
Distribution Static Compensator (D-STATCOM)
It is a shunt connected voltage source converter which has several
advantages such as:
 Low harmonic production
 Small in size
 Low power losses and no resonance issues

6. Power Stability Index and Power Loss Index methods are used for
determining the optimal location of D-STATCOM.
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Fig. 2: Single line diagram of IEEE 12 bus distribution system.

7. POWER LOSS INDEX (PLI)
The bus which has the highest magnitude value of PLI is selected
as a candidate bus for this method.
After reading the line and bus data of the radial distribution
system, the load flow analysis is performed to calculate the
voltages and the losses.
Power Loss Indices are calculated as:
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[ ]
min
[ ]
max min
(1)
P i P
PLI i
P P




8. POWER STABILITY INDEX (PSI)
 This index is developed after considering the line
parameters.
 If a given line i-j has the largest PSI magnitude, then
the device is placed on bus j.
 The value of PSI is calculated using the formula:
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4 ( )
[ ] =
2
( [ ]cos( ))
(2)
R Pl Pg
ij
PSI i
V i  



9. RESULTS AND DISCUSSIONS
For base loading and double loading, the losses are acceptable and
the voltage profile is high, so considered triple loading condition.
a) Selection of Candidate Buses
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Fig. 3: Power Loss Indices on different buses.

10.  Bus 9 has been chosen as the candidate bus with greatest PLI
value with magnitude 1.00.
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Fig.4: Power Stability Indices on different buses.
The highest value of PSI came in between buses 9 to 10, then we
consider bus 10 as the candidate bus with PSI magnitude of 0.1287.

11. Description Without D-
STATCOM
PLI
selection
PSI
selection
Candidate Bus ------ Bus 9 Bus 10
Active power loss 𝑃𝐿(MW) 0.203746 0.075934 0.077982
Reactive power loss 𝑄𝐿(MVAR) 0.079468 0.029449 0.030267
Minimum voltage (p.u) 0.8830 0.9478 0.9499
Reduction in 𝑃𝐿 (MW) 0 0.127812 0.125764
Reduction in 𝑄𝐿 (MVAR) 0 0.050019 0.049201
Table-I: Summary of results for PLI and PSI selection criteria
with and with D-STATCOM.
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12. CONCLUSION
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 After increasing the load up to 300% of the base load, losses
were increase and decrease the voltage profile across the buses.
 The PLI selection criteria proved itself better than the PSI
selection criteria in terms of reduction in power losses.
 The PSI selection criteria proved itself better than the PLI
selection criteria for improvement of voltage profile.

13. THANK YOU
FOR YOUR
ATTENTION!