Modulation strategy for leakage current suppression in odd H‑bridge unit systems

Manyuan Ye; Zhenyuan Luo

Modulation strategy for leakage current suppression in odd H‑bridge unit systems

Manyuan Ye

Zhenyuan Luo

Vol. 25, No. 10, pp. 1963-1977, Oct. 2025

10.1007/s43236-025-01026-0

Odd-numbered unit cascade H-bridge

Improved modulation strategy

Leakage current

Abstract

Due to the high-frequency action of switching tubes, the parasitic capacitance voltage of a photovoltaic panel to the ground changes at high frequency, resulting in large leakage current. The traditional method of suppressing leakage current often needs to add hardware, which often increases the cost. Therefore, this paper designs an improved modulation strategy from the perspective of software to realize a zero-cost suppressing system for leakage current. In this paper, the lack of an effective modulation strategy for leakage current suppression in CHB systems with odd-numbered elements is introduced. Then the reasons for leakage current generation are analyzed from the circuit physical model, and an improved modulation strategy for suppressing leakage current in three-element systems is introduced to realize the suppression of parasitic capacitor voltage fluctuations. This strategy is extended to systems with more odd-numbered elements. It can be seen by simulation and experimental results that when compared with traditional shift-amplitude modulation, the improved modulation strategy can suppress 46.19%, 34.76%, and 64.06% of leakage current in three-unit, five-unit, and seven-unit systems. Therefore, it can be concluded that the improved modulation strategy can greatly suppress system leakage current.

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Cite this article

[IEEE Style]

M. Ye and Z. Luo, "Modulation strategy for leakage current suppression in odd H‑bridge unit systems," Journal of Power Electronics, vol. 25, no. 10, pp. 1963-1977, 2025. DOI: 10.1007/s43236-025-01026-0.

[ACM Style]

Manyuan Ye and Zhenyuan Luo. 2025. Modulation strategy for leakage current suppression in odd H‑bridge unit systems. Journal of Power Electronics, 25, 10, (2025), 1963-1977. DOI: 10.1007/s43236-025-01026-0.