Master–slave modulated model predictive control to optimize current tracking for parallel cascaded H‑bridge power supplies

Bichen Yan; Haihong Huang; Haixin Wang

Master–slave modulated model predictive control to optimize current tracking for parallel cascaded H‑bridge power supplies

Bichen Yan

Haihong Huang

Haixin Wang

Vol. 23, No. 1, pp. 35-47, Jan. 2023

10.1007/s43236-022-00513-y

Cascaded H-bridge power supply

Current tracking

Circulating current suppression

Model predictive control

Multi-parallel

Master–slave control structure

Abstract

Conventional distributed control has achieved a great deal of success in multi-parallel cascaded H-bridge (CHB) power supplies. However, conventional distributed controllers can have a seriously imbalanced output power due to a mismatch of the hardware or control parameters and form an unstable circulating current path between the CHB converters, which can lead to a couple of problems. (1) The stability and tracking performance of the branch current can become degraded. (2) The current-sharing reactor can be easily saturated. To optimize all the branch currents of multiple parallel CHB power supplies, a master–slave carrier-based model predictive control method is proposed in this paper. This control strategy can achieve an optimized current tracking performance and effective circulating current suppression. In addition, through carriers, H-bridge interleaving and branch synchronization can be easily achieved, which fixes the switching frequency. Thus, the advantages of model predictive control and interleaving can be combined. Based on the generalized branch current predictive model derived in this paper, when more than two paralleled CHB converters have different output powers, an optimized branch current response can be achieved and circulating current can be eliminated. Simulation and experimental results verify the effectiveness of the proposed method.

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Cite this article

[IEEE Style]

B. Yan, H. Huang, H. Wang, "Master–slave modulated model predictive control to optimize current tracking for parallel cascaded H‑bridge power supplies," Journal of Power Electronics, vol. 23, no. 1, pp. 35-47, 2023. DOI: 10.1007/s43236-022-00513-y.

[ACM Style]

Bichen Yan, Haihong Huang, and Haixin Wang. 2023. Master–slave modulated model predictive control to optimize current tracking for parallel cascaded H‑bridge power supplies. Journal of Power Electronics, 23, 1, (2023), 35-47. DOI: 10.1007/s43236-022-00513-y.