Multilevel buck boost converter

1. DESIGN AND SIMULATION OF FIVE LEVEL BUCK BOOST
CONVERTER FOR GRID CONNECTED HYBRID POWER SYSTEM
USING MATLAB/SIMULINK
ICSSIT-2023
23rd Jan 2023
Paper Id: ICSSIT-261
Presented by:
SHRI HARSHA J
15PH4EE003
Research Scholar, SSAHE
Assistant Professor.
Department of Electrical and Electronics Engineering
VIDYA VIKAS INSTITUTE OF ENGINEERING AND TECHNOLOGY

2. OUTLINE OF PRESENTATION
Conventional Buck-Boost Converter
Proposed Converter topology
Simulation Results
Conclusion

3. INTRODUCTION
A DC–DC converter with a
high step-up voltage gain is
used for many applications,
such as high-intensity
discharge lamp ballasts for
automobile headlamps, fuel
cell energy conversion
systems, solar-cell energy
conversion systems and
battery backup systems for
uninterruptible power
supplies.
To accomplish high
voltage gain DC-DC five
level buck-boost
converter is utilized
which is a combination
of voltage multiplier cell,
voltage lift switched
inductor cell and
conventional DC-DC
converter.
In this paper a voltage
lift switched inductor
(VLSI) cell is used to
increase the boost
capacity of DC to DC
five level buck boost
converter.

4. CONVENTIONAL BUCK-BOOST
CONVERTER

6. PROPOSED CONVERTER TOPOLOGY

7. MODE-1 OPERATION WHEN SWITCH S
IS ON

8. MODE 2: WHEN SWITCH S IS OFF

9. ANALYSIS
Voltage gain ratio for five level buck boost converter is
𝐺5 =
9+𝐷
(1−𝐷)
Vs = 12V, Vo = 400V, P200W
R=
(𝑉0 )2
𝑃
=
4002
200
= 800Ω
K = 70.8%

10. The critical inductance LC value is calculated from below expression
𝐿𝐶1 = 𝐿𝐶2 =
1−𝐷 𝑅
2𝑓
Where, f = Swiching frequency in Hertz
R = Resistive load in ohm
The critical inductance value will depends on duty ratio, switching
frequency and resistive load.
LC1=LC2=
1−0.708 (800)
2∗5000
=25mH
The critical capacitance value can be obtained from the below expression
CCritical ≫
N2
π2Fs
2
L
CCritical =
52
𝜋∗ 5𝐾2 (25𝑚)
= 310*10−6
F

11. DESIGN DETAILS
Power 200W
Input Voltage 12 volts
Input Current 16 ampere
Duty cycle 70.8
Output Voltage 400 volts
Output Current 0.5 ampere
Inductors 25mH
Capacitors 330µF

12. PI CONTROLLER
DC five buck-boost converter for resistive load required PI
controller to maintain constant output voltage under
fluctuating load

13. CONTROLLER SETTINGS
Controller
type
𝐺𝐶(𝑆) 𝐾𝑃 𝑇𝑖 𝑇𝐷
P
𝐾𝑝
𝑇
𝐿
∞ 0
PI
𝐾𝑝 1 +
1
𝑇𝑖𝑆
0.9
𝑇
𝐿
𝐿
0.3
0
PID
𝐾𝑝 1 +
1
𝑇𝑖𝑆
1.2
𝑇
𝐿
2L 0.5L

14. SIMULATION RESULTS

15. Output voltage

16. Output Current

17. CLOSED LOOP FIVE LEVEL BUCK BOOST CONVERTER
WITH RESISTIVE LOAD

18. Output Voltage

19. Output Current

20. Output voltage in
V
Output current in
A
Resistive load in Ω
400 0.5 800
403.4 0.448 900
405.3 0.405 1000
406.7 0.37 1100
408 0.34 1200
418 0.052 8K
420 5.25 800K

21. CONCLUSION
 The voltage-lift switched-inductor cell is used to
improve the five level buck boost converter's boost
capacity.
 This converter topology is appropriate for
applications requiring unidirectional power transfer
and high gain supply voltage escalation.
 When compared to traditional buck boost
converters, this converter offers high gain for a
specific number of levels.
 DC five buck-boost converter for resistive load with
PI controller maintains constant output voltage
under fluctuating load.

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