基于模型预测的牵引逆变器容错控制方法  

Fault-tolerant Control of Traction Inverter Based on Model Prediction

作　　者：徐孟玥 XU Mengyue(China Railway SIYUAN Survey and Design Group Co.,Ltd Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司电化院,武汉430063

出　　处：《铁道勘测与设计》2023年第4期58-62,共5页Railway Survey and Design

摘　　要：牵引逆变器开关频繁,成为高速列车传动系统中最脆弱的环节。因此,稳定高效的容错控制策略对于保证牵引逆变器在故障状态下的连续稳定运行并降低其对列车运营的影响至关重要。因为不需要对异步电机电流和电压进行复杂的解耦计算,直接转矩控制得到广泛应用。然而,在故障状态下,逆变器只能输出四个电压向量,仿真结果表明,直接转矩控制在四开关逆变器中的控制性能较差,扭矩和速度波动较大。模型预测控制算法具有滚动求解和反馈校正等特点,适用于解决多变量、强耦合和多约束的工程问题。本文提出一种基于模型预测的牵引逆变器控制方法,可实时解决最优电压向量问题。仿真结果验证了模型预测控制算法的控制性能。The traction inverter is the weakest link in the transmission system of high-speed trains due to frequent switching of the switches.Therefore,a stable and efficient fault-tolerant control strategy for the traction inverter is particularly important to ensure its continuous stable operation in a fault state and reduce its impact on train operation.Direct torque control has been widely used because it does not require complex decoupling calculations for the current and voltage of the asynchronous motor.However,in a fault state,the inverter can only output four voltage vectors,and simulation results show that direct torque control has poor control performance for fourswitch inverters,with large torque and speed fluctuations.The model predictive control algorithm has the characteristics of rolling solving and feedback correction,making it suitable for solving engineering problems with multiple variables,strong coupling,and multiple constraints.A control strategy for tranction inverter based on model prediction is proposed in this paper,which can solve the optimal voltage vector in real-time.The control performance of the model predictive control algorithm is verified by simulation.

关 键 词：牵引逆变器 模型预测 容错控制 

分 类 号：TM4[电气工程—电器]