1. STABILITY ENHANCEMENT
OF GUJARAT GRID
THROUGH SHUNT
COMPENSATION
By
1. Yagnik Utsav P. (M.E. Scholar, SSEC)
2. Solanki Mehul D. (Asst. Prof., SSEC)
Electrical Engineering
Paper ID - 149
04 April 2016 NCERTE-2016 1
2. Outline
04 April 2016 NCERTE-2016 2
• Abstract (4)
• Network Considered (5)
• Network Parameters (6)
• Why this network? (7)
• Other considerations (8)
• Computation using Power World Simulator (9)
• Power World Simulator results without
compensation (10)
3. Outline
• Power World Simulator results with
compensation (11)
• Computation using MATLAB (12)
• MATAB results (13)
• Table of improvement (14)
• Another observation in simulation (15)
• Conclusion (16)
• Future work (17)
• I am thankful to… (18)
• References (19)
04 April 2016 NCERTE-2016 3
4. Abstract
• Blackout is a major concern to the power system
administrator, as it can lead to the collapse of whole system or
grid and this situation is arising out of maintaining the supply
to the buses tackling bulk of power and is considered to be
weaker and left uncompensated. In this paper, Gujarat power
system network of 220kV has been considered and its power
flow simulation has been carried out to identify the weak bus
in case of given loading. Weak bus has been compensated
with shunt compensation to keep the voltage of that
particular bus regulated within a tight band and not allowed
to collapsing below specified limits.
04 April 2016 NCERTE-2016 4
6. Network parameters
• Total 11, 220kV buses showing maximum
loading conditions during April-2013.
• 1 slack bus(Gandhinagar)
• 3 Generator buses(Wanakbori, Kadana, Ukai)
• 7 Load buses(Soja, Karamsad, Asoj, Godhara,
Mehsana, Jambuva, Ranasan)
• Transmission lines made up of Zebra
Conductors having r = 0.08 Ω/km and x =
0.402 Ω/km
04 April 2016 NCERTE-2016 6
7. Why this network?
• The considered buses in the network are to be
energized first in case of blackout, so if these
buses can maintain their voltage limits, then it
will be easier to maintain the network alive in
case of sudden load changes and an island of
Gujarat grid system will survive.
• But if we can’t do the same, these buses will
also go into the blackout.
04 April 2016 NCERTE-2016 7
8. Other Considerations
• Here considering maximum loadings in the
April-2013, the load flow study has been run
to identify the weakest buses in the network
i.e. Karamsad and Jambuva.
• Once identified, proper compensation has
been provided on Karamsad bus to
compensate and to bring its voltage limits
back in to tolerable limits.
04 April 2016 NCERTE-2016 8
12. Computation using MATLAB
• Weak bus
considered PV
bus injecting
reactive power
• In this case
Karamsad
• All generator
buses
considered
operating at
their limit
Enter the case
data
• Gauss Seidel
method
Run load flow
• Voltage profile
improvement
over Power
World
Simulator
results
Observing the
improved
voltage profile
04 April 2016 NCERTE-2016 12
13. MATLAB results
Bus
No.
Bus Name Bus
type
Nomina
l
Voltage
(kV)
Per Unit
Voltage
Voltage
(kV)
Angle
(Degree)
Real
Load
(MW)
Reactive
Load
(MVAR)
Real
Power
Generatio
n
(MW)
Reactive
Power
Generation
(MVAR)
Shunt
Capacitor
(MVAR)
1 Gandhinagar 1 232 1.05 231 0 103 58 0.00 0.00
2 Wanakbori 2 230 1.03 226.6 12.2805 196 96 875 656.00
3 Kadana 2 230 1.03 226.6 9.09780 203 126 240 180.00
4 Ukai 2 230 1.03 226.6 17.1885 150 87 300 225.00
5 Soja 3 220 0.9962 219.164 -3.0102 123 60
6 Karamsad 2 220 1.0000 216.678 1.0292 88 52 0 141.21 141.21
7 Asoj 3 220 0.9352 204.578 5.1492 80 52
8 Godhra 3 220 0.9888 217.536 8.2266 256 139
9 Mehsana 3 220 0.9560 210.320 -5.9675 177 77
10 Jambuva 3 220 0.9446 206.206 4.2883 120 64
11 Ranasan 3 220 1.0029 219.846 2.4452 134 65
04 April 2016 NCERTE-2016 13
14. Table of improvement
Bus No. and Name Voltage (p.u.)
without
compensation
Voltage (p.u.) with
compensation in
PWS
Voltage (p.u.) with
compensation in
MATLAB
1 Gandinagar 1.0000 1.0000 1.0500
2 Wanakbori 1.0000 1.0000 1.0300
3 Kadana 1.0000 1.0000 1.0300
4 Ukai 1.0000 1.0000 1.0300
5 Soja 0.9518 0.9518 0.9962
6 Karamsad 0.8700 0.9702 1.0000
7 Asoj 0.9066 0.9406 0.9352
8 Godhra 0.9537 0.9537 0.9888
9 Mehsana 0.9122 0.9122 0.9560
10 Jambuva 0.8871 0.9353 0.9446
11 Ranasan 0.9324 0.9574 1.0029
04 April 2016 NCERTE-2016 14
15. Another observation in simulation
• Slack bus is Gandhinagar instead of Wanakbori
so 4 buses other than slack and generator (i.e.
Asoj, Godhara, Jambuva, Ranasan) showing
positive angles as they are in between load
buses and generation buses.
04 April 2016 NCERTE-2016 15
16. Conclusion
• Gujarat island with its most heavily loaded buses
considered in April 2013 with maximum loads in the
season of summer.
• Weak bus Karamsad and Jambuva identified and
provided required compensation at Karamsad bus but
still slack bus operates at very poor power factor.
• Once the capacitor value is found out, the voltage profile
is further improved in MATLAB by considering all
generator buses (PV buses) operating at 0.8 power factor
which is minimum required limit. So that slack bus gets
little less burden of providing reactive power.
04 April 2016 NCERTE-2016 16
17. Future Work
• A self operating load dependent FACT device
can be realized in place of fixed capacitor at
weak bus.
04 April 2016 NCERTE-2016 17
18. I am thankful to…
• Mr. Mukund Upadhyaya (Ex. Chief Engineer,
GSECL)
• Asst. Prof. Neepa Shah (Project Guide in B.E. at
VGEC)
• My colleagues at B.E. level…
1. Mr. Keyur Dhagia (Hindalco)
2. Mr. Karan Gandhi (S.K. Power)
3. Mr. Arpit Kothari (Infosys)
4. Mr. Santosh Grampurohit (Infosys)
04 April 2016 NCERTE-2016 18
19. References
1. D.P. Kothari, I.J. Nagrath, ‘Modern Power System Analysis’, Vol. 16,
Tata McGraw Hill Education Private Limited, pp. 204-213, 2003.
2. John J. Grainger, William D. Stevenson, ‘Power System Analysis’,
McGraw Hill Publications, pp. 5-11 & pp. 335-342, 1994.
3. P. Srikanth, O. Rajendra, A. Yesuraj, M. Tilak, “Load Flow Analysis
of IEEE 14 Bus System Using MATLAB”, International Journal of
Engineering Research & Technology (IJERT), Vol. 2 Issue 5, May –
2013.
4. ‘Recovery procedure for western region’, Power System Operation
Corporation Ltd.(POSCO), pp. 22-37, December – 2013,
5. Dharamjit, D.K.Tanti, “Load Flow Analysis on IEEE 30 bus System”,
International Journal of Scientific and Research Publications,
Volume 2, Issue 11, November 2012
04 April 2016 NCERTE-2016 19
