Research on Modulation Strategy and Power Balancing Method Optimization of Cascaded H-Bridge Inverter
DOI:
https://doi.org/10.71222/mfqmab61Keywords:
hybrid cascaded inverter, carrier reconstruction, modulation wave reconstruction, power balancingAbstract
Compared to symmetric cascaded H-bridge inverters (CHB), hybrid cascaded inverter technology can generate more voltage levels with fewer inverter units. In traditional inverter modulation strategies, hybrid cascaded inverters produce high-quality voltage output. However, due to power imbalance among cascaded units, the uneven power distribution accelerates unit degradation, thereby affecting the overall lifespan of the inverter. To address these issues, this paper proposes a novel modulation strategy. The low-voltage units undergo carrier reconstruction, while the high-voltage units employ modulation wave reconstruction, achieving power balancing across all units. The low-voltage units exhibit improved power-balancing response speed compared to traditional methods. Simulation results validate the effectiveness of the proposed approach.
References
1. M. Manjrekar and G. Venkataramanan, "Advanced topologies and modulation strategies for multilevel inverters," in IEEE Annu. Power Electron. Spec. Conf., Maggiore, Italy, 1996, pp. 1013-1018, doi: 10.1109/PESC.1996.548706.
2. X. Qian, L. Chen, Y. Jin, Y. Mu, A. F. Cupertino, H. Jia, "An improved fault-tolerant control scheme for cascaded H-bridge STATCOM with higher attainable balanced line-to-line voltage," IEEE Trans. Ind. Electron., vol. 68, no. 4, pp. 2784-2797, 2021, doi: 10.1109/TIE.2020.2978716.
3. J. Gu, F. Song, W. Zhang, M. Zhang and Z. Du, "Novel modulation scheme for balancing power distribution among modules in nine-level asymmetric cascaded H-bridge inverter," IEEE Trans. Transp. Electrification, vol. 9, no. 1, pp. 1178-1188, 2023, doi: 10.1109/TTE.2022.3170690.
4. I. S. Indrajit and B. G. Fernandes, "Modified hybrid multicarrier PWM technique for cascaded H-bridge multilevel inverter," in 40th Annu. Conf. IEEE Ind. Electron. Soc., 2014, pp. 4318-4324, doi: 10.1109/IECON.2014.7049152.
5. M. Ye, Q. Wei, W. Ren, et al., "Modified modulation strategy of 1:1:2 asymmetric nine-level inverter and its power balance method," Electronics, vol. 9, no. 1, p. 75, 2020, doi: 10.3390/electronics9010075.
6. X. Wu, C. Xiong, S. Yang, H. Yang, and X. Feng, "A simplified space vector pulsewidth modulation scheme for three-phase cascaded H-bridge inverters," IEEE Trans. Power Electron., vol. 35, no. 4, pp. 4192-4204, 2020, doi: 10.1109/TPEL.2019.2934821.
Downloads
Published
Issue
Section
License
Copyright (c) 2025 Guo Cheng, Alexis John Rubio (Author)
This work is licensed under a Creative Commons Attribution 4.0 International License.
