Sub‑module capacitor voltage fluctuation suppression strategy in full‑bridge MMC DC de‑icers

Zheng Zheng; Mengyao Shi; Haijun Tao; Mengyu Wei

Sub‑module capacitor voltage fluctuation suppression strategy in full‑bridge MMC DC de‑icers

Vol. 25, No. 9, pp. 1771-1783, Sep. 2025

10.1007/s43236-025-01003-7

Full-bridge modular multilevel converter

DC de-icer

Sub-module capacitance voltage

Control strategy of FO-PIλ

Abstract

To solve the problem of capacitance–voltage fluctuation in the bridge arm sub-module (SM) of full-bridge modular multilevel converter (FBMC) DC de-icers, a capacitance–voltage fluctuation suppression method based on the fractional-order PIλ (FO-PIλ) control strategy is proposed. The proposed method indirectly suppresses the voltage fluctuation of SMs by controlling the circulating current. First, a mathematical model of a FBMC DC De-icer is established, and the coupling relationship formula between the capacitance voltage of the SM and the inter-phase double-frequency circulation is derived. Based on this model, a FO-PIλ circulation controller is designed for double-frequency circulation, and the optimal parameters for the controller are determined by the classical frequency-domain method. Finally, simulations and semi-physical experiments are carried out. Simulation results show that the voltage fluctuation of a SM with the FO-PIλ control strategy fluctuates by 8.16%, which is reduced by 12.5% when compared with PI control. Experimental results show that under disturbance conditions, the voltage fluctuation under the FO-PIλ control strategy is 1.54 V, which is reduced by 15.38% when compared with the PI-control strategy. Therefore, it can be seen that the FO-PIλ control strategy has certain advantages.

Statistics

Show / Hide Statistics

Cumulative Counts from September 30th, 2019
Multiple requests among the same browser session are counted as one view. If you mouse over a chart, the values of data points will be shown.

Cite this article

[IEEE Style]

Z. Zheng, M. Shi, H. Tao, M. Wei, "Sub‑module capacitor voltage fluctuation suppression strategy in full‑bridge MMC DC de‑icers," Journal of Power Electronics, vol. 25, no. 9, pp. 1771-1783, 2025. DOI: 10.1007/s43236-025-01003-7.

[ACM Style]

Zheng Zheng, Mengyao Shi, Haijun Tao, and Mengyu Wei. 2025. Sub‑module capacitor voltage fluctuation suppression strategy in full‑bridge MMC DC de‑icers. Journal of Power Electronics, 25, 9, (2025), 1771-1783. DOI: 10.1007/s43236-025-01003-7.