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http://dx.doi.org/10.6113/TKPE.2022.27.5.446

Carrier Based LFCPWM for Leakage Current Reduction and NP Current Control in 3-Phase 3-Level Converter  

Lee, Eun-Chul (Research and Development Department, EKOS Co., Ltd.)
Choi, Nam-Sup (Division of Electrical, Electronic Communication and Computer Eng., Chonnam National University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.27, no.5, 2022 , pp. 446-454 More about this Journal
Abstract
This study proposes a carrier-based pulse width modulation (PWM) method for leakage current reduction and neutral point (NP) current control in a three-phase three-level converter, which is a carrier-based PWM version of the previously proposed low-frequency common mode voltage PWM. Three groups of space vectors with the same common mode voltage are used. When the averaged NP current needs to be positive or negative, the specific groups are employed to produce low-frequency common mode voltages. The validity of the proposed PWM method is verified through experiments.
Keywords
3-level converter; Leakage current; Neutral point current control; Carrier based PWM;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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1 K. S. Ahn, N. S. Choi, E. C. Lee and H. J. Kim, "A study on a carrier based PWM having constant common mode voltage and minimized switching frequency in three-level inverter," Journal of Electrical Engineering & Technology, Vol. 11, No. 2, pp. 393-404, Mar. 2016.   DOI
2 Nho-Van Nguyen and Mon-Van Doi, "Carrier based PWM control of 3-level NPC inverter with DC neutral point balancing and common mode voltage reduction," in 10th International Conference on Power Electronics-ECCE Asia, pp. 1213-1220, May. 2019.
3 N. S. Choi and E. C. Lee, "Simple implementation of space vector PWM using barycentric coordinates," in Korea Institute of Power Electronics 2015 Summer Conference, pp. 45-46, Jul. 2015.
4 U. M. Choi, J. S. Lee and K. B. Lee, "New modulation strategy to balance the neutral-point voltage for three-level neutral-clamped inverter systems," IEEE Trans. on Energy Conversion, Vol. 29, No. 1, pp. 91-100, Mar. 2014.   DOI
5 Tianbao Yu, Wenchao Wan and Shanxu Duan, "A modulation method to eliminate leakage current and balance neutral-point voltage for three-level inverters in photovoltaic systems," IEEE Trans. on Industrial Electronics (Early Access), DOI 10.1109/TIE.2022.3161809, 2022.   DOI
6 J. S. Lee and K. B. Lee, "New modulation techniques for a leakage current reduction and a neutral-point voltage balance in transformerless photovoltaic systems using a three-level inverter," IEEE Trans. on Power Electronics, Vol. 29. No. 14, pp. 1720-1732, Apr. 2014.   DOI
7 E. C. Lee, N. S. Choi and K. S. Ah, "Overmodulation characteristics of carrier based MVPWM for eliminating the leakage currents in three-level inverter," The Transactions of the Korean Institute of Power Electronics, Vol. 20, No. 6, pp. 509-516, Dec. 2015.   DOI
8 E. C. Lee, N. S. Choi and H. J. Kim, "Space vector PWM method for leakage current reduction and NP current control in 3-phase 3-level converter used in bipolar DC distribution system," The Transactions of the Korean Institute of Power Electronics, Vol. 23, No. 5, pp. 336-344, Oct. 2018.   DOI
9 N. S. Choi, E. C. Lee and K. S. Ahn, "A carrier-based meduim vector PWM strategy for three level inverters in transformerless photovoltaic systems," in 2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia), pp. 2752-2757, Jun. 2015.