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

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