Modulated model predictive current control strategy of a single‑phase three‑level converter undergoing grid frequency variation

Kwonhoon Kim; Hanjong Yoon; Sungmin Lee; Younghoon Cho

Modulated model predictive current control strategy of a single‑phase three‑level converter undergoing grid frequency variation

Vol. 25, No. 2, pp. 336-345, Feb. 2025

10.1007/s43236-024-00965-4

NPC converter

Modulated model predictive control

Second-order generalized integrator

Phase-locked loop

Abstract

This work proposes the application of a modulated model predictive control (MMPC) to a neutral point clamped (NPC) converter, aiming to achieve a highly efficient and stable power conversion across a wide range of operating conditions. The dynamic nature of grid environments, particularly the potential for fluctuations in grid frequency, presents significant challenges for maintaining system stability and performance. This work implements a phase-locked loop (PLL) algorithm designed to effectively adapt to variations in grid frequency to address these challenges. The PLL algorithm was optimized to ensure that the system can maintain precise phase synchronization and consistent control performance. The integration of the MMPC with the PLL algorithm enhances the control strategy, improving the NPC converter’s reliability and efficiency while also enabling it to effectively handle grid frequency variations. Experiments were conducted with a 1-kW NPC converter to validate the proposed controller. Simulation and experimental results confirmed the validity of the controller.

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Cite this article

[IEEE Style]

K. Kim, H. Yoon, S. Lee, Y. Cho, "Modulated model predictive current control strategy of a single‑phase three‑level converter undergoing grid frequency variation," Journal of Power Electronics, vol. 25, no. 2, pp. 336-345, 2025. DOI: 10.1007/s43236-024-00965-4.

[ACM Style]

Kwonhoon Kim, Hanjong Yoon, Sungmin Lee, and Younghoon Cho. 2025. Modulated model predictive current control strategy of a single‑phase three‑level converter undergoing grid frequency variation. Journal of Power Electronics, 25, 2, (2025), 336-345. DOI: 10.1007/s43236-024-00965-4.