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Time response enhancement for variable speed drive systems by using five-level cascade four quadrant chopper in

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Summary

This study presents an improved filtering circuit for variable speed drive (VSD) systems. The new design enhances system performance by reducing voltage drops and improving response times.

Keywords:
Applied computingCascade multi-level convertersDC-linkElectrical engineeringEnergyFour-quadrant chopperHarmonic mitigationIndustrial engineeringInformation systemsPower qualityVariable speed drive system VSDS

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Area of Science:

  • Electrical Engineering
  • Power Electronics

Background:

  • Variable speed drive (VSD) systems require efficient filtering for optimal performance.
  • Conventional VSDs face challenges with time response and voltage drops.

Purpose of the Study:

  • To design and implement an advanced filtering circuit for medium power VSD systems.
  • To improve the time response characteristics on both grid and DC-link sides.

Main Methods:

  • Developed a cascade five-level H-bridge four-quadrant chopper scheme from a conventional three-level scheme.
  • Integrated a novel filtering circuit using modern power electronics.
  • Analyzed and compared the performance of the proposed system with the conventional one.

Main Results:

  • Reduced voltage drop across cascade chopper transistors by half compared to conventional designs.
  • Mitigated sharp fluctuations in system waveforms, improving steady and transient state responses.
  • Achieved a total harmonic distortion (THD) of 26.2% for input current and 2.43% for input voltage.
  • Reduced the DC-link current ripple factor (RF) to 0.196.

Conclusions:

  • The proposed filtering circuit significantly enhances the performance of VSD systems.
  • The cascade five-level chopper design offers superior voltage handling and waveform quality.
  • This advancement leads to more efficient and reliable VSD operation.