基于模型预测的船舶推进电机缺相故障容错控制研究

Fault-Tolerant Control of Marine Propulsion Motor Open- Circuit Fault Based on Model Prediction Theory

关键词:  船舶电力推进系统  模型预测电流控制  缺相故障  容错控制  解耦矩阵重构

Key words:  Marine electric propulsion system  Model predictive current control  Open-circuit fault  Fault-tolerant control  Decoupling matrix reconstruction

摘要:

针对船舶电力推进系统中推进电机缺相故障，提出一种基于模型预测的容错控制方法。根据单相开路后推进电机故障状态方程，重新构建新解耦矩阵得到新坐标系下解耦电流，以此提高预测控制性能。仿真结果表明，模型预测容错电流控制方法在缺相故障下，可降低0.15%转矩稳态误差，削减0.24%转矩脉动，且定子电流具有更好的正弦性，在螺旋桨负载下，船舶电力推进系统转速输出更稳定，具有更强的容错能力，可以实现断相后的稳定运行，提升船舶航行安全可靠性。

Abstract:

A single-phase open-circuit fault tolerant control based on model prediction theory was presented for marine electric propulsion system. According to the fault state space representation of the propulsion motor after one phase open， a new decoupling matrix is reconstructed to obtain the decoupling current in the new coordinate system， so as to improve the performance of predictive control. The simulation results show that the fault-tolerant current control can reduce the stay-state error by 0.15% and the ripple by 0.24% under phase failure for torque， the stator current has better sinusoidal properties yet. Under propeller load， the speed output of propulsion motor has better stability and stronger fault tolerance. Therefore the marine electric propulsion system can realize stable operation after phase failure with this method， enhance the safety and reliability of navigation as well.