A Novel Overlap-Time Effect Suppression for Current Source Converter

Hao Ding, Quanjie Li, Jing Yuan (), Wei Wang, Mingming Li and Josep M. Guerrero
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Hao Ding: Electrical Engineering Department, Yanshan University, Qinhuangdao 066004, China
Quanjie Li: Electrical Engineering Department, Yanshan University, Qinhuangdao 066004, China
Jing Yuan: Electrical Engineering Department, Yanshan University, Qinhuangdao 066004, China
Wei Wang: Electrical Engineering Department, Yanshan University, Qinhuangdao 066004, China
Mingming Li: Electrical Engineering Department, Yanshan University, Qinhuangdao 066004, China
Josep M. Guerrero: Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark

Energies, 2022, vol. 15, issue 16, 1-16

Abstract: In order to ensure the continuity of the DC-side inductor current, current source converter (CSC) needs to add overlap time between the drive signals, but the overlap time will introduce low order (mainly fifth and seventh) harmonics to the grid current, which seriously degrade the harmonic performance of grid current. At present, some research has been conducted to theoretically analyze and mitigate the overlap-time effect in CSC, including the use of positive-slope sawtooth wave or negative-slope sawtooth wave as the carrier wave, turning on the switch early or delaying turning it off, and eliminating the deviation effect by compensation algorithms, etc. However, existing overlap-time suppression schemes takes the nearest three vector synthesis reference vector scheme as the object of study, in other words, the effect of overlap time on the non-nearest three-vector synthesis reference vector scheme has not been considered. To address these issues, this paper takes the non-nearest three-vector synthesis reference vector scheme as the object of study to analyze the effect of overlap time on the driving signal and establishes the quantitative relationship between the current harmonics introduced in the grid current and overlap time through Fourier decomposition. Then, the design process of the proposed improved space vector modulation by constructing freewheeling channels to replace the overlap time is presented in detail. Finally, simulation and experimental results verify that the overlap-time suppression effect of the proposed scheme is about 100%.

Keywords: current source converter; overlap time; space vector modulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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