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

ABSTRACT:

The main objective of this paper is to study and analyse the voltage output waveform of a multilevel inverter, 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 inverter 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 behaviour of the model of the converter, with the logic piloting gate signals, has been obtained  in Matlab-Simulink environment.

KEYWORDS:

1.      Multilevel Power Converter

2.      Soft switching

3.      Phase Shifted Voltage Cancellation

SOFTWARE: MATLAB/SIMULINK

 CIRCUIT DIAGRAM:

Fig. 1. Single-phase five-level CHBMI

 EXPECTED SIMULATION RESULTS:

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°.

CONCLUSION:

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 (Voc*4Yrr.

REFERENCES:

 [I] K. Sivakumar, A. Das, R. Ramchand, C. Patel, and K. Gopakumar, A five-level inverter scheme for a four-pole induction motor drive by feeding the identical voltage-profile windings from both sides, IEEE Trans. Ind. Electron., vol. 57, no. 8,pp. 2776-2784, Aug. 2010.

[2] M. Caruso et a!., Design and experimental characterization of a low-cost, real-time, wireless AC monitoring system based on ATmega 328P-PU microcontroller, 2015 AEIT International Annual Conference (AEIT), Naples, 2015, pp. 1-6. doi: 1O.1109/AEIT.2015.7415267

[3] M. Caruso, R. Miceli, P. Romano, G. Schettino, C. Spataro and F. Viola, A low-cost, real-time monitoring system for PV plants based on ATmega 328P-PU microcontroller, 2015 IEEE International Telecommunications Energy Conference (INTELEC), Osaka, 2015, pp. 1-5. doi: 10.1109/INTLEC2015.7572270

[4] M. Caruso, V. Cecconi, A. O. Di Tommaso, and R. Rocha. A Rotor Flux and Speed Observer for Sensorless Single-Phase Induction Motor Applications. International Journal of Rotating Machinery, vol. 2012, no. 276906, p. 13,2012.

[5] M. Caruso, A O. Di Tommaso, F. Genduso, R. Miceli and G. R. Galluzzo, A DSP-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.