conference

1. Utilization of Small Sized SMES for Wind
disturbance In Wind Penetrated Power
System
1
Dr S Zahid Nabi Dar
and
Dr Shailendra Baraniya
CMR Institute of Techonology
Bengaluru

2. Introduction
2
• A Power system in presence of inertial energy support from
wind turbines is studied.
• Incorporation of small sized energy storage device is
detailed in fig 1.
• To Make system practical steam reheat and governor dead
band are incorporated in modelling
Figure 1: Incorporation of ESS with Wind penetrated Power System
+
+
1
B
1
1
R
s
K l 1
G1
sT
1
0
/ω
2
N
1
N


C1
0
R1
H1
sT
1
ω
T/
sα
1


R1
sT
1
s
1
NACE
GA Tuned
SMES
s
T13
2
P1
P1
sT
1
K

-
+
Governor
deadband
Turbine
ACE
net1
ΔP
sup1
ΔP
L
ΔP
T1
ΔP
1
f

tie1
ΔP
*
sm1
P
sm1
I
sm1
P

-
-
+
-
-
GRC
DFIG
+
-
+

3. Working Principle of SMES
3
Figure 2: Incorporation of ESS for Power Reversal
• A type 2 class B second quadrant chopper is utilized for reversal of
current by varying the duty ratio.
• The ESS here is SMES , acting like an inductor coil and current
reversal leads to power reversal
• This modules operates in three modes standby releasing and
charging by varying the duty ratio.

4. Mathematical Model of ESS
The chopper current as well as the voltage through the SMES coil at any time instant can
be portrayed by the following equations:-
VSMES=SSMESVDC (1)
(2)
The chopper current at a certain instant can be established by the below
given equations:-
Ics = ism 0 < T ≤ dt – 0.5t
(3)
Ssmes Level is refered as :- -1/0/+1
Where (-)1 means discharging, 0 means standby, and 1 means absorbing
4
DC
smes
smes
smes
smes V
d
I
R
dt
dI
L *
)
1
2
( 



5. Wind Penetrated Power System
• DFIG is utilized for wind penetration with
conventional Power system
• An additional torque loop is developed to utilize the
inertia present in turbine and blades of DFIG in case
of power outage.
• A small sized energy storage device is incorporated
for bidirectional energy transfer.
• In case of power demand the energy is released by
energy storage system and in event of energy
surplus the energy is stored in the energy storage
system
5

6. Results
6
Fig. 2 Plots for electromechanical oscillations for
a wind disturbance

7. Results
7
Figure 5 :Plots for SMES Variables for Wind
disturbance

8. Discussion on Results
Ser NO
%Reduction ΔPD Δf1 Δf2
1 FOPID-DFIG 0.01 46.5 70.8 50.6
2 PID-DFIG 0.01 20.3 56.7 27.39
3 DFIG and GA
tuned SMES
0.01 99.65 99.65 79.48
8
TIE
P

TABLE. 1. Improvement in Results
The SMES current remains within the upper and lower limits of
350 A and 150 A, as shown in figure 5.
As a result, SMES is not in immediate danger. There is also a
99.65 percent decrease in frequency and a 79.48 percent
divergence in Tie line damping.

9. Conclusion
• Herein we have considered a two area power system with wind
penetration from 2MW Induction motor based DFIG and a 100 kW SMES
in each area.
• It has been discovered that combining a small energy storage device with
DFIG results in a profitable and productive operation, as well as a
significant reduction in electromechanical oscillations.
• Future research could focus on establishing and maintaining SMES
power limits, as well as integrating the grid with solar photovoltaics
electrical vehicles for more diverse functioning
• Further incorporation of such system with weak power systems can
provide energy storage support
• Moreover power systems with high-penetration of wind can incorporate
SMES
9

10. References
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•
• . S Zahid, Nabi Dar, Javed Sheikh, Iqbal, Shamim Ahmad lone: Analysing two area power system with genetically tuned superconductor magnetic energy
storage system July 2017 DOI: 10.1109/ICICICT1.2017.8342658 Conference: 2017 International Conference on Intelligent Computing, Instrumentation and
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