Verification of New Family for Cascade Multilevel Inverters with Reduction of Components

ABSTRACT:

This paper now a new group for multilevel converter that do. as symmetric and asymmetric state. The planned multilevel converter produce DC voltage levels similar to other geography with less number of semiconductor exchange.

DVR

It results in the decline of the number of trade, losses, installation area, and converter cost. To verify the voltage injection capacity of the planned inverter, the planned topology is used in dynamic voltage restorer (DVR) to restore load voltage.

MATLAB

The operation and work of the planned multilevel converters are confirmed by simulation using SIMULINK/MATLAB and experimental results.

 KEYWORDS:

  1. Cascaded multilevel converter,
  2. New topology
  3. Reduction of components
  4. DVR

 SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

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Fig. 1. Proposed cascade topology
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 Fig. 2. Proposed topology with four DC voltage sources.

 EXPECTED SIMULATION RESULTS:

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Fig. 3. (a) Supply voltage, (b) DVR injection voltage, and (c) load voltage for the three-phase balanced voltage sag.

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Fig. 4. Output phase voltage in fault (sag) time

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Fig. 5. (a) Supply voltage, (b) DVR injection voltage, and (c) load voltage for the three-phase balanced voltage swell.

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Fig. 6. Output phase voltage in fault (swell) time.

 CONCLUSION:

 In this paper, a novel topology was given for multilevel converter, which has decreased number of exchange. The suggested topology needs fewer switches for achieving voltages for the same levels of output voltages.

TOPOLOGY

This point decrease the installation area and the number of gate driver circuits. Therefore, the cost of the proposed topology is less than the conventional topology. Based on the given switching algorithm, the multilevel inverter produce near sinusoidal output voltage, causing very low harmonic distortion.

TRANSFORMER

The proposed inverter used in DVR does not require any coupling series transformer and has lower cost, smaller size, and higher work and ability. Simulation results verified the validity of the given concept.

REFERENCES:

[1] Z. Pan, F.Z. Peng, “Harmonics optimization of the voltage balancing control for multilevel converter/ inverter systems”, IEEE Trans. Power Electronics, pp. 211-218, 2006.

[2] L.M. Tolbert, F. Z. Peng, T. Cunnyngham, J. N. Chiasson, “Charge Balance Control Schemes for Cascade Multilevel Converter in Hybrid Electric Vehicles,” IEEE Trans. Industrial Electronics, Vol. 49, No. 5, pp. 1058-1064, Oct. 2002.

[3] S. Mariethoz, A. Rufer, “New configurations for the three-phase asymmetrical multilevel inverter,” in Proceeding of the IEEE 39th Annual Industry Applications Conference, pp. 828-835, Oct. 2004.

[4] J.Rodriguez, J.S. Lai, F.Z. Peng, “Multilevel Inverter: A Survey of Topologies, Controls, and applications”, IEEE Trans. on Industrial Electronics, Vol. 49, No. 4, August. 2002.

[5] J.S. Lai, F.Z. Peng, “Multilevel Converters-A New Breed of power Converters”, IEEE Trans. Industry Application, Vol. 32, No. 3, pp. 509-517, MAY/JUNE.1996

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