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

Safwan Nadweh; Ola Khaddam; Ghassan Hayek; Bassan Atieh; Hassan Haes Alhelou

doi:10.1016/j.heliyon.2020.e04739

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

Heliyon. 2020 Aug 16;6(8):e04739. doi: 10.1016/j.heliyon.2020.e04739. eCollection 2020 Aug.

Authors

Safwan Nadweh¹, Ola Khaddam¹, Ghassan Hayek¹, Bassan Atieh², Hassan Haes Alhelou¹

Affiliations

¹ Electrical Power Engineering, Tishreen University, Lattakia, Syria.
² Mechatronics Engineering, Manara University, Lattakia, Syria.

Abstract

This research introduces a filtering circuit design integrated with the DC-link of a medium power variable speed drive (VSD) system. The designed filtering circuit employs modern power electronic circuits to improve time response characteristics in both grid and dc-link sides. Depending on the widely used multi-level converters, a conventional three-level H-bridge four-quadrant chopper scheme was developed into a cascade five-level H-bridge four-quadrant chopper scheme. The time response of the proposed system was performed with both choppers, and results showed that voltage drop on cascade chopper transistors was reduced to half in comparison with voltage drop on conventional four-quadrant chopper transistors. Moreover, the sharp fluctuations in system's waves were mitigated; consequently, time response characteristics in both steady and transient states were remarkably improved. The total harmonic distortion factor THD% of the input current and voltage was reduced to 26.2% and 2.43% respectively and the ripple factor RF for DC-link current was reduced to 0.196.

Keywords: Applied computing; Cascade multi-level converters; DC-link; Electrical engineering; Energy; Four-quadrant chopper; Harmonic mitigation; Industrial engineering; Information systems; Power quality; Variable speed drive system VSDS.