Simulation of a Single-Phase Five-Level Cascaded H Bridge Inverter with Multicarrier SPWM B-Spline Based Modulation Techniques

ABSTRACT

 Multilevel Power Inverters are now often used to convert DC to AC voltage waveform. This kind of converter allows high power quality with low output harmonics and lower commutation losses with respect to the traditional ones in order to optimize this aspect. This paper presents a novel simulation analysis of the Multicarrier Sinusoidal Pulse Width Modulation (MC SPWM) techniques B-Spline functions based to control the switches of five-level single-phase cascaded H bridge inverter. In order to verify the performance of the converter, the harmonic content of the voltage due to modulation techniques has been taken into account. Results highlight the comparison between different B-Spline functions.

 KEYWORDS

  1. Multilevel power converter
  2. Multicarrier modulation techniques
  3. B-spline functions

 SOFTWARE: MATLAB/SIMULINK

 CIRCUIT DIAGRAM

Fig. 1: CHBMI single-phase with 2n+ 1 level

 EXPECTED SIMULATION RESULTS

 

 Fig. 2: Comparison of TH D% versus reference voltage trend for Phase Disposition PD carriers: B 2(t), B  3(t) and B 4(t).

Fig. 3: Comparison TH D% versus reference voltage trend for

Phase Opposition Disposition POD carriers: B  2(t), B  3(t) and B 4(t).

Fig. 4: Comparison TH D% versus reference voltage trend for

Alternative Phase Opposition Disposition AP OD carriers: B 2(t),

B 3(t) and B 4(t).

Fig. 5: Comparison TH D% versus reference voltage trend for

Phase Shifted PS carriers: B  2(t), B 3(t) and B  4

Fig. 6: Comparison Fundamental Amplitude versus reference

voltage trend for Phase Disposition PD carriers: B2(t), B3(t) and

B4(t).

Fig. 7: Comparison Fundamental Amplitude versus reference

voltage trend for Phase Opposition Disposition POD carriers:

B 2(t), B  3(t) and B 4(t).

Fig. 8: Comparison Fundamental Amplitude versus reference

voltage trend for Alternative Phase Opposition Disposition AP OD

carriers: B 2(t), B 3(t) and B 4(t).

Fig. 9: Comparison Fundamental Amplitude versus reference

voltage trend for Phase Shifted PS carriers: B  2(t), B 3(t) and B 4(t).

 CONCLUSION

This paper presents a simulation analysis of the Multi carrier Sinusoidal Pulse Width Modulation techniques B-Spline functions based for five-level single-phase cascaded H-bridge invert er. The multi carrier modulation techniques taken into account are PD, POD, AP OD and PS using PB 2(t), PB 3(t) and PB  4(t) as carrier signals. In order to verify the performance of converter and harmonic content of the voltage, the used tool for comparison of different modulation techniques is TH D%. The computed TH  D% values versus reference voltage (peak value) for the phase voltage have been presented and the related results have been compared among different carrier signals used. The minimum value of the TH D% has  been obtained by using the PS modulation techniques with PB 4(t) as carrier signal.

REFERENCES

 [1] A. Ta k a  ha  s hi I. Nab e and H. Aka  g i, A new neutral-point clamped PW M invert er, IEEE Trans. Ind. A  p pl., 17, 518″ 1981.

[2] .T. Rodriguez, .T.-S. La i, and F. Z. Pen g, Multilevel invert  er s: a survey of top  o l o  g i e s, controls, and applications, Industrial Electronics, IEEE Transactions on, vol. 49, no. 4, pp. 724- 738, Aug. 2002.

[3] M. Caruso e t a  l., 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  .1 109!A E  IT.  201  5.7 415  267

[4] M. Caruso, V. Ce  c co n 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.

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 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.

 KEYWORDS:

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

 SOFTWARE: MAT LAB/SIM U LINK

 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 (V o  c*4 Y r r).

REFERENCES:

[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.