high gain switched capacitor multilevel inverter with reduced stress and energy storage elements

1. High Gain Switched Capacitor Multilevel
Inverter with Reduced stress and
Energy Storage Elements
Presented By :
Ms. Elsa Susan Jacob
MAC19EEPE03
M. Tech.PE
EEE Dept.
Guided by,
Smt. Beena M Varghese
Associate Professor
EEE Dept.
MACE

2. Contents
 Objectives
 Literature Review
 Single-Phase Seven level Inverter
 Control strategy
 Simulink Model with results
 Proposed Inverter
 Analysis
 Hardware Implementation
 Conclusion
 References
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High Gain Switched Capacitor Multilevel Inverter

3. Objectives
 To design a high gain Multilevel inverter.
 To reduce the inrush current of the inverter.
 To reduce the switching stress.
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High Gain Switched Capacitor Multilevel Inverter

4. Literature Review
 J. Chen, "A Single-Phase Step-Up Seven-Level Inverter With a Simple
Implementation Method for Level-Shifted Modulation Schemes," in
IEEE Access , 2019.
 Natural capacitor voltage balance
 Triple voltage gain
 Reduced number of components compared to
existing seven level inverter topologies.
 High capacitor inrush current.
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Fig.1. Single phase Seven Level Inverter
High Gain Switched Capacitor Multilevel Inverter

5. Single-phase Seven level Inverter
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Fig.5. Single-phase Seven-level inverter( Source : Chen et al., 2019)
0 𝑽𝒅𝒄
-𝑽𝒅𝒄
-2𝑽𝒅𝒄
-3𝑽𝒅𝒄
+ 𝑽𝒅𝒄
+2𝑽𝒅𝒄
+3𝑽𝒅𝒄
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Fig.6. Theoretical waveform
High Gain Switched Capacitor Multilevel Inverter

6. Operating Modes of Seven-level Inverter
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 Mode 1 (𝑽𝒐= 0)
 Mode 2 (𝑽𝒐= + 𝑽𝒅𝒄)
Fig.7. Mode 1 Operation
Fig.8. Mode 2 Operation
High Gain Switched Capacitor Multilevel Inverter
 Mode 4 (𝑽𝒐= +3𝑽𝒅𝒄)
Fig.9. Mode 3 Operation
Fig.10. Mode 4 Operation
 Mode 3 (𝑽𝒐= +2𝑽𝒅𝒄)

7. Simulation Parameters of Seven-level Inverter
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Table.1. Simulation Parameters
High Gain Switched Capacitor Multilevel Inverter

8. Simulink Model of Seven-level Inverter
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Fig.19. Simulink Model of Seven-level Inverter
High Gain Switched Capacitor Multilevel Inverter

9. Proposed Multilevel Inverter
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Fig.31 (a) Single phase Seven level Inverter and (b) Proposed Multilevel Inverter
(a) (b)
SC Cell
High Gain Switched Capacitor Multilevel Inverter

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 Output Voltage and output current (M.I =1) with R and RL load Using FFM
Simulation Results
Fig.49.(a)Output Voltage and Output Current with R and (b)RL Load (24Ω and 100mH) for M.I=1
(a)
(b)
High Gain Switched Capacitor Multilevel Inverter

11. Analysis of Proposed Inverter
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Fig.55. (a) THD Vs Control strategies (b) THD Vs Switching Frequency(kHz) (c)Power loss in LSSM technique
High Gain Switched Capacitor Multilevel Inverter
(a) (b)
0
2
4
6
8
10
12
14
16
18
PDPWM LSSM PODPWM APODPWM FFM
THD(%)
14.5
15
15.5
16
16.5
17
17.5
18
0 10 20 30 40 50 60
THD(%)
Switching frequency(kHz)
PDPWM
PODPWM
APODPWM
LSSM
0
2
4
6
8
10
12
14
16
18
20
Switching loss Conduction loss Capacitor loss Total loss
Power
loss(W)
Basic Proposed
6.87
6.39
7.52
11.75
14.96
18.3
(c)
0.57
0.154

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Comparison of Inverters
Table 4 . Comparison of different inverters
Table 3 . Component Comparison of different inverters
𝑁𝐿 = No. of levels, 𝑁𝑠𝑤= No. of switches, 𝑁𝐷𝐶= No. of DC sources, 𝑁𝑑= No. of diodes
Input voltage = 30 V
High Gain Switched Capacitor Multilevel Inverter

13. Conclusion
 High gain inverter compared to existing topologies.
 Reduced switching stress.
 Reduced inrush current.
 Reduced number of energy storage elements.
 Reduced number of power components compared to other topologies.
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High Gain Switched Capacitor Multilevel Inverter

14. References
[1] J. Chen, C. Wang and J. Li, "A Single-Phase Step-Up Seven-Level Inverter With a Simple Implementation
Method for Level-Shifted Modulation Schemes," in IEEE Access , vol. 7, pp. 146552-146565, 2019.
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8862817
[2] Y. Nakagawa and H. Koizumi, “A hybrid nine-level inverter with series/parallel conversion,” in Proc. IEEE
International Symposium Circuits and Systems 2017, Baltimore, USA, 28-31 May 2017, pp. 1-4.
[3] J. Liu, J. Wu, J. Zeng, and H. Guo H, “A novel nine-level inverter employing one voltage source and reduced
components as high-frequency ac power source,” IEEE Transaction Power Electronics, vol. 32, no. 4, pp.
2939-2947, April 2017.
[4] Y. Nakagawa and H. Koizumi, "A Boost-Type Nine-Level Switched Capacitor Inverter," in IEEE Transaction
Power Electronics, vol. 34, no. 7, pp. 6522-6532, July 2019.
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High Gain Switched Capacitor Multilevel Inverter

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