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

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

Safwan Nadweh  1 , Ola Khaddam  1 , Ghassan Hayek  1 , Bassan Atieh  2 , Hassan Haes Alhelou  1
Affiliations

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

Safwan Nadweh et al. Heliyon. .

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.

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Figures

Figure 1
Figure 1
Four quadrant chopper and its operation mode.
Figure 2
Figure 2
Five-level cascade four quadrant chopper.
Figure 3
Figure 3
Studied system.
Figure 4
Figure 4
Modulation and careers signals.
Figure 5
Figure 5
Control scheme of the cascade transistor chopper.
Figure 6
Figure 6
TR1 gate signal.
Figure 7
Figure 7
TR2 gate signal.
Figure 8
Figure 8
TR5 gate signal.
Figure 9
Figure 9
TR6 gate signal.
Figure 10
Figure 10
Grid currents.
Figure 11
Figure 11
dc – link current.
Figure 12
Figure 12
Chopper current.
Figure 13
Figure 13
Load current.
Figure 14
Figure 14
Choppers transistor voltages.
Figure 15
Figure 15
Phase – phase source voltage in transient state.
Figure 16
Figure 16
Source current in transient state.
Figure 17
Figure 17
dc-link current in transient state.
See this image and copyright information in PMC

References

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