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JPE, Vol. 19, No. 4, July 2019
Fault-Tolerant Control for 5L-HNPC Inverter-Fed Induction Motor Drives with Finite Control Set Model Predictive Control Based on Hierarchical Optimization
Chunjie Li, Guifeng Wang, Fei Li, Hongmei Li, Zhenglong Xia, and Zhan Liu
Area Adjustable Speed Drives
Abstract This paper proposes a fault-tolerant control strategy with finite control set model predictive control (FCS-MPC) based on hierarchical optimization for five-level H-bridge neutral-point-clamped (5L-HNPC) inverter-fed induction motor drives. Faulttolerant operation is analyzed, and the fault-tolerant control algorithm is improved. Adopting FCS-MPC based on hierarchical optimization, where the voltage is used as the controlled objective, called model predictive voltage control (MPVC), the postfault controller is simplified as a two layer control. The first layer is the voltage jump limit, and the second layer is the voltage following control, which adopts the optimal control strategy to ensure the current following performance and uniqueness of the optimal solution. Finally, simulation and experimental results verify that 5L-HNPC inverter-fed induction motor drives have strong fault tolerant capability and that the FCS-MPVC based on hierarchical optimization is feasible.
Keyword Fault-tolerant capability,Finite control set model predictive control (FCS-MPC),Five-level H-bridge neutral-pointclamped (5L-HNPC) inverter,Hierarchical optimization
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