Modulation strategy for capacitor unit cascaded H‑bridges

Jun Gu; Guangyao Zhu; Haoran Sun; Qiangqiang Ning; Xiang Zhu

Modulation strategy for capacitor unit cascaded H‑bridges

Vol. 26, No. 3, pp. 495-509, Mar. 2026

10.1007/s43236-025-01086-2

Multilevel inverter

Cascaded H-bridge

Capacitance voltage control

Modulation strategy

Abstract

To address the issue of the low DC power supply voltage utilization of the traditional 1:1:1 cascaded H-bridge inverter, a solution has been proposed that involves the use of a capacitor in place of the DC voltage source, thus forming an inverter with a capacitor unit. The switching angle of each switching tube is calculated by selective harmonic elimination pulsewidth modulation (SHEPWM). SHEPWM is improved by combining the redundant switching state, resulting the improved specified harmonic elimination modulation strategy having two modes. The modulation strategy mode is dependent upon the relationship between the discrepancy between the capacitor reference voltage and the actual voltage, and the output current. This is to achieve regulation and stability of the DC capacitor. By analyzing the charging and discharging state of the capacitor, in conjunction with the voltage ripple requirements of the capacitor, it is possible to ascertain the minimum capacitor parameters. Through simulation and experimental verification, it can be seen that the modulation strategy proposed in this paper can effectively eliminate the corresponding harmonics, complete the charging and discharging of the capacitor, and improve the stability of the capacitor voltage.

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Cite this article

[IEEE Style]

J. Gu, G. Zhu, H. Sun, Q. Ning, X. Zhu, "Modulation strategy for capacitor unit cascaded H‑bridges," Journal of Power Electronics, vol. 26, no. 3, pp. 495-509, 2026. DOI: 10.1007/s43236-025-01086-2.

[ACM Style]

Jun Gu, Guangyao Zhu, Haoran Sun, Qiangqiang Ning, and Xiang Zhu. 2026. Modulation strategy for capacitor unit cascaded H‑bridges. Journal of Power Electronics, 26, 3, (2026), 495-509. DOI: 10.1007/s43236-025-01086-2.