Comparative Study of THD Spectrum on Switched Capacitor Inverter

International Journal of Electrical and Electronics Engineering
© 2017 by SSRG - IJEEE Journal
Volume 4 Issue 6
Year of Publication : 2017
Authors : Bhagyalakshmi P S, Beena M Varghese, Dr. Bos Mathew Jos
How to Cite?

Bhagyalakshmi P S, Beena M Varghese, Dr. Bos Mathew Jos, "Comparative Study of THD Spectrum on Switched Capacitor Inverter," SSRG International Journal of Electrical and Electronics Engineering, vol. 4,  no. 6, pp. 22-29, 2017. Crossref,


Multilevel inverter is a commonly used power electronic device because of its characteristics of synthesizing a sinusoidal output on several steps. They give good quality output resulting with lower harmonic distortion in the output. This topology is designed based on Switched Capacitor with charge pump technique and the number of output levels is determined by the number of Switched Capacitor (SC) cells used. A small input voltage can be used to produce a boosted output voltage, by switching the capacitors in series and in parallel by properly switching the power electronic switches. Number of switching devices used in the circuit is reduced as compared to the conventional cascaded multilevel inverter. This work also presents the comparative study of controllers using various Multicarrier Pulse Width Modulation (MCPWM) techniques. Performance factors such as % THD, voltage stress, ripple voltage etc. are measured for different modulation techniques and the results are studied. MCPWM method with the different modulating signal based PWM such as Sinusoidal Multicarrier PWM, Sampling PWM, Rectified Sinusoidal PWM and Trapezoidal PWM has been analyzed. The simulations are done with MATLAB/ SIMULINK software. From the simulation results seven level inverter shows less THD using Alternate Phase Opposition Disposition (APOD) PWM. The control strategy is the key part for the circuit and switching signals are generated with the help of PIC16F877A microcontroller.


Multilevel Inverter, charge Pump, Charging, Single DC Source, Switched Capacitor.


[1] Akira Nabae, Isao Takashi, ―A New Neutral-Point-Clamped PWM Inverter", IEEE transaction on industrial applications, Vol. IA-17, No. 5. September/October 1981.
[2] Jos Rodrguez, Jih-Sheng Lai and Fang Zheng Peng, ―Multilevel Inverters: A Survey of Topologies, Controls, and Applications", 2008 IEEE transaction on industrial electronics, Vol. 49, No. 4, August 2002.
[3] S.S. Deshmukh, H.T.Jadhav, ―Effective Loss Reduction Analysis in New Switched- Capacitor Boost-Multilevel Inverter Using Series/Parallel Conversion", 2014 IEEE Students Conference on Electrical, Electronics and Computer Science, 978-1-4799-2526-1/14, 2014.
[4] Elyas Zamiri, Naser Vosoughi, ―A New Cascaded Switched- Capacitor Multilevel Inverter Based on Improved Series- Parallel Conversion with Less Number of Components", IEEE Transactions on Industrial Electronics, 2015.
[5] Bagher Karami, Reza Barzegarkhoo, Adib Abrishamifar and Mehdi Samizadeh, ―A Switched Capacitor Multilevel Inverter for High AC Power Systems with Reduced Ripple Loss Using SPWM Technique", The 6th International Power Electronics Drive Systems and Technologies Conference (PEDSTC2015), 3-4 February 2015 IEEE.
[6] T. Sengolrajan, B. Shanthi, S. P. Natarajan, ―Comparative Study of Multicarrier PWM Techniques for Seven Level Cascaded Z-Source Inverter", International Journal of Computer Applications (Cat. No.01CH37181), (0975 8887) Volume 65 No.6, March 2013.
[7] Janusz A. Starzyk, Ying-Wei Jan, and Fengjing Qiu ―A DC– DC Charge Pump Design Based on Voltage Doublers, IEEE Transactions on Circuits And Systems—I: Fundamental Theory And Applications, VOL. 48, NO. 3, MARCH 2001.
[8] M.Kanimozhi, P Geetha, ―A New Boost Switched Capacitor Multilevel Inverter Using Different Multi Carrier PWM Techniques", 2014 International Conference on Circuit, Power and Computing Technologies [ICCPCT] , 978-1- 4799-2397-7/14, IEEE 2014.
[9] Amrita Mariam Varghese, Beena M Varghese, Elizabeth Sebastian, ―FPGA based Single Phase Switched Capacitor Boost Multilevel Inverter", APEC 2001. IJSRD- International Journal for Scienti_c Research and Development , Vol. 3, Issue 07, 2015 | ISSN (online): 2321-0613.
[10] Yuanmao Ye, K.W.E. Cheng, Junfeng Liu, and Kai Ding, ―A Step-Up Switched- Capacitor Multilevel Inverter with Self Voltage Balancing", APEC 2001. IEEE Transactions On Industrial Electronics, 10.1109/TIE.2014.2314052, 2013.
[11] N.A. Rahim, M.F.M. Elias, Wooi Ping Hew, ―Transistor- Clamped H-Bridge Based Cascaded Multilevel Inverter With New Method of Capacitor Voltage Balancing, IEEE Trans. Ind. Electron., vol. 60, no. 8, pp. 2943-2956, Aug. 2013.
[12] P. Thongprasri, "A 5-Level Three-Phase Cascaded Hybrid Multilevel Inverter", International Journal of Computer and Electrical Engineering, Vol. 3, No 6, December 2011.
[13] Y. Hinago and H. Koizumi, ―A switched-capacitor inverter using series/ parallel conversion, Proc. IEEE Int. Symp. Circuits, Syst 2010, pp. 31883191.
[14] B. Axelrod, Y. Berkovich, and A. Ioinovici, ―A cascade boost-switched capacitor converter-two level inverter with an optimized multilevel output waveform, IEEE Trans. Circuits Syst. I, Reg. Papers, vol. 52, no.12, PP.27632770, Dec. 2005.
[15] R. Bensraj, S. P. Natarajan, ― Multicarrier Trapezoidal Pwm Strategies Based On Control Freedom Degree For MSMI, ARPN Journal of Engineering and Applied Sciences, Vol. 5, No. 5, May 2010.
[16] Rekha Agrawal, Jitendra Kumar Tandekar, ―Multi-Carrier Pulse Width Modulation Schemes for Multilevel Converters, 2016 IEEE Students' Conference on Electrical, Electronics and Computer Science.
[17] K. Gopalakrishnan, M. Sundar Raj, ―Harmonic Evaluation of Multicarrier Pwm Techniques for Cascaded Multilevel Inverter, Middle-East Journal of Scientific Research 20 (7): 819-824, 2014.
[18] Brendan Peter McGrath, ―Multicarrier PWM Strategies for Multilevel Inverters, IEEE Transactions on Industrial Electronics, VOL. 49, NO. 4, AUGUST 2002
[19] Pradyumn Chaturvedi , Rajesh Nema , ―Switching losses and harmonic investigations in multilevel inverters, on Sunday, December 07, 2008, www. researchgate. net/publication /26570208.
[20] Shahab Yousefizad, Vahab Yousefizad, Vahid Eslampanah, Hamid Abbasi, ―THD Minimisation for Phase Voltage of Multilevel Inverters Using Genetic Algorithm, The International Journal Of Engineering And Science (IJES), Volume 4, Issue 2.
[21] Amin Gholizad, Murtaza Farsadi, - A Novel State of Charge Balancing Method Using Improved Staircase Modulation of Multilevel Inverters, IEEE Transactions on Industrial Electronics, 2016.
[22] Muhammad H Rashid, - Power Electronics Handbook: Devices, Circuits, and Applications, Second Edition, Academic Press.
[23] Dr. P S Bimbhra, - Power Electronics, Khanna Publishers, Delhi, 2012
[24] Ned Mohan, Tore M. Undeland, William P. Robbins, ‗Power Electronics‘, John Wiley & Sons Publications , 3rd edition, 2006