New Approach for Harmonic Mitigation in Single Phase Five-Level CHBMI with Fundamental Frequency Switching


The main objective of this paper is to study and analyse the voltage output waveform of a multilevel invert  er, to suggest a new approach for harmonic mitigation improving the converter performance. These last type of converters represent a new technology in the field of DC/AC electrical energy conversion, presenting advantages respect to the traditional converters. In fact, the multilevel power converters present a low harmonic content and a high voltage level. The paper considers a five-level single-phase cascaded H-bridge invert er  (CHBMI) and fundamental frequency modulation techniques. The voltage waveform analysis has allowed to identify a working area of the converter where there are lowest values of the considered harmonic amplitude. The simulated behavior of the model of the converter, with the logic piloting gate signals, has been obtained  in Mat  lab-Sim u link environment.


  1. Multilevel Power Converter
  2. Soft switching
  3. Phase Shifted Voltage Cancellation
  4. CHBMI



Fig. 1. Single-phase five-level CHBMI



Fig. 2. Gate signals H-Bridge I with a=~=30°.

Fig. 3. Gate Signals H-Bridge 2 with a=~=30°.

Fig. 4. Voltage trend over time with a=~=30°.


In this paper a fundamental switching modulation strategy for single-phase five-level CHBMI that mitigate low order harmonics is presented. The proposed method, through the control of the a and P parameters, allows the mitigation of third, fifth, seventh, ninth and eleventh harmonics. The values of the control parameters can be obtained without needs to solve a set of nonlinear transcendental equations. However, the fundamental harmonic amplitude can only be varied from 42% to 92% of 2 (V o  c*4 Y r r).


[I] K. Siva k u  m  a r, A. D a s, R. Ram c  h  an d, C. Patel, and K. Go p a  k u mar, A five-level invert  er scheme for a four-pole induction motor drive by feeding the identical voltage-profile winding from both sides, IEEE Trans. Ind. Electron., vol. 57, no. 8,pp. 2776-2784, Aug. 2010.

[2] M. Caruso e t a!., Design and experimental characterization of a low-cost, real-time, wireless AC monitoring system based on AT mega 328 P-PU micro controller, 2015 A E IT International Annual Conference (A E IT), Naples, 2015, pp. 1-6. do i: 1 O. 1109/ a E IT. 2015.7415267

[3] M. Caruso, R. Mice l i, P. Romano, G. Sc h e t t in o, C. Spat a r o and F. Viola, A low-cost, real-time monitoring system for P V plants based on AT mega 328 P-PU micro controller, 2015 IEEE International Telecommunications Energy Conference (IN TEL E C), Osaka, 2015, pp. 1-5. do i: 10.1109/INTL EC 2015. 7572270

[4] M. Caruso, V. Ce c c on  i, A. O. Di Tom mas o, and R. Rocha. A Rotor Flux and Speed Observer for Sensor less Single-Phase Induction Motor Applications. International Journal of Rotating Machinery, vol. 2012, no. 276906, p. 13,2012.

[5] M. Caruso, A O. Di Tom mas o, F. G end u so, R. Mic e l i and G. R. Gall u  z z o, A D S P-Based Resolver-To-Digital Converter for High-Performance Electrical Drive Applications, in IEEE Transactions on Industrial Electronics, vol. 63, no. 7, pp. 4042- 4051, July 2016.

Leave a Reply

Your email address will not be published. Required fields are marked *