MPC based fault tolerance control of AC–DC power converters for offshore wind turbines

Yaohua Shi; Yanhui Feng; Ming Ren; Yingning Qiu

MPC based fault tolerance control of AC–DC power converters for offshore wind turbines

Vol. 25, No. 3, pp. 578-589, Mar. 2025

10.1007/s43236-024-00914-1

wind turbine

AC–DC converter

Open-circuit fault

Fault tolerance control

Model predictive control

Abstract

This paper proposes a Self-Healing Fault Tolerance Control (SH-FTC) approach for AC–DC power converters, where only one control program can cope with normal and switch fault scenarios without extra hardware topology modifications. The limited recovery effect and delayed fault-tolerant response of existing software fault tolerance approaches are due to nonoptimal switching modulation redesigns and unavoidable external diagnosis processes. Based on Model Predictive Control (MPC), the SH-FTC approach can achieve real-time optimization of the converter switching state under normal and fault scenarios. To omit external diagnosis, prediction error monitoring and zero vector switching modules are designed and incorporated into the cost function to search for the optimal switching state in each of the control cycles among the normal switching states and faulty switching states caused by switch faults. Experimental results show system distortions under single-switch, double-switch, and triple-switch open-circuit fault conditions can be restored to a great extent, where the current total harmonic distortions are reduced from 35.4–96.0% to 8.1–15.6%. When compared with existing software fault tolerance schemes, a faster and smoother transition from normal to fault-tolerant operation (about one control cycle) is realized without external fault diagnosis and control program redundancy. It provides a promising and cost-eff ective solution to improve the converter reliability of wind turbines, especially for off shore applications.

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Cite this article

[IEEE Style]

Y. Shi, Y. Feng, M. Ren, Y. Qiu, "MPC based fault tolerance control of AC–DC power converters for offshore wind turbines," Journal of Power Electronics, vol. 25, no. 3, pp. 578-589, 2025. DOI: 10.1007/s43236-024-00914-1.

[ACM Style]

Yaohua Shi, Yanhui Feng, Ming Ren, and Yingning Qiu. 2025. MPC based fault tolerance control of AC–DC power converters for offshore wind turbines. Journal of Power Electronics, 25, 3, (2025), 578-589. DOI: 10.1007/s43236-024-00914-1.