Periodic adaptive learning operation control method for maglev trains using multi-harmonic estimation
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摘要:
为提高磁浮列车的运行控制位置及速度跟踪精度,针对磁浮列车在固定线路上周期性运行的特点,提出了一种基于多谐波阻力估计的模型参考周期自适应学习控制(MH-MRAC-PALC)方法。所设计的复合控制器由反馈控制、前馈控制和多谐波阻力估计补偿器3部分组成,并基于Lyapunov稳定性理论设计了估计补偿器参数更新率;MH-MRAC-PALC控制器通过融合当前周期实时数据与历史周期运行信息,实现对运行阻力的在线估计与动态补偿;基于磁悬浮试验线进行数值仿真,并将所设计控制器与常规比例-积分-微分(PID)控制器和MH-MRAC控制器进行对比分析。仿真结果表明:经过20个周期的学习,MH-MRAC-PALC控制器的位置跟踪性能显著提升,其均方根误差从首周期的0.076 4 m降至0.006 9 m,最大误差从0.254 8 m降至0.027 4 m;速度跟踪均方根误差从0.035 6 m·s-1降至0.002 9 m·s-1,最大误差从0.104 7 m·s-1降至0.012 2 m·s-1;相比之下,PID控制器的位置和速度均方根误差分别为0.633 6 m和0.076 3 m·s-1,MH-MRAC控制器分别为0.085 3 m和0.040 1 m·s-1;且经过20个运行周期学习后,MH-MRAC-PALC控制器已能准确估计多谐波阻力;存在未知阻力和坡道扰动的复杂工况下,该控制器表现出更强的抗干扰能力和更高的跟踪精度。相比于传统PID控制和MRAC控制,MH-MRAC-PALC控制方法通过周期学习机制实现了阻力准确估计,降低了位置及速度跟踪误差,显著提升了磁浮列车的运行控制性能。
Abstract:A model reference periodic adaptive learning control method based on multi-harmonic resistance estimation (MH-MRAC-PALC) was proposed according to the periodic operation characteristics of maglev trains on fixed routes to improve the operation control position and speed tracking accuracy of maglev trains. The designed composite controller consists of three parts: feedback control, feedforward control, and the multi-harmonic resistance estimation compensator. Meanwhile, based on Lyapunov stability theory, the parameter update rate of the estimation compensator was designed. By integrating real-time data of the current cycle and historical cycle operation information, online estimation and dynamic compensation of the operating resistance were achieved with the MH-MRAC-PALC controller. Based on the maglev test line, numerical simulation was conducted, and comparative analysis between the designed controller, conventional PID controller and MH-MRAC controller was carried out. The simulation results show that after 20 cycles of learning, the position tracking performance of the MH-MRAC-PALC controller is significantly improved, its root mean square error (RMSE) is reduced from 0.076 4 m in the first cycle to 0.006 9 m, and the maximum error is reduced from 0.254 8 to 0.027 4 m. Additionally, the speed tracking RMSE is reduced from 0.035 6 m·s-1 to 0.002 9 m·s-1, and the maximum error is reduced from 0.104 7 to 0.012 2 m·s-1. In comparison, the position and speed RMSEs of the PID controller are 0.633 6 m and 0.076 3 m·s-1, respectively, and those of the MH-MRAC controller are 0.085 3 m and 0.040 1 m·s-1, respectively. After 20 operation cycles of learning, the MH-MRAC-PALC controller can accurately estimate the multi-harmonic resistance. In complex working conditions with unknown resistance and slope disturbance, the controller exhibits stronger anti-interference ability and higher tracking accuracy. Compared with traditional PID control and MRAC control, the MH-MRAC-PALC control method achieves accurate resistance estimation, reduces the position and speed tracking errors, and significantly improves the operation control performance of maglev trains through the periodic learning mechanism.
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表 1 磁悬浮列车试验线路数据
Table 1. Experimental track data of maglev trains
里程区间/m 坡度/‰ 0~15 450 0.0 15 450~20 450 -33.0 20 450~30 450 120.0 30 450~34 450 -1.2 34 450~50 000 0.0 表 2 仿真参数
Table 2. Simulation parameters
动力学参数 $ m\mathrm{、}{k}_{\mathrm{N}}\mathrm{、}{K}_{\mathrm{f}} $ 307 000、6、1 C1控制器 $ {k}_{\mathrm{p}}\mathrm{、}{k}_{\mathrm{i}}\mathrm{、}{k}_{\mathrm{d}} $ 7、0.01、0.01 C2/C3控制器 $ {k}_{1}\mathrm{、}{k}_{2} $ 7、0.01 MRAC学习系数 $ {\gamma }_{0}\mathrm{、}{\gamma }_{1}\mathrm{、}{\gamma }_{2} $ 90、0.1、0.1 PALC学习系数 $ {\eta }_{0}\mathrm{、}{\eta }_{1}\mathrm{、}{\eta }_{2} $ 0.005、78 534、78 534 表 3 控制系统性能指标定量对比
Table 3. Quantitative comparison of control system performance indicators
控制器 运行阶段 $ {e}_{\mathrm{x}} $(t)的RMSE/m $ {e}_{\mathrm{x}} $(t)的MAE/m $ {e}_{\mathrm{v}} $(t)的RMSE/(m·s-1) $ {e}_{\mathrm{v}} $(t)的MAE/(m·s-1) C1 1~20周期 0.633 6 1.149 2 0.076 3 0.456 7 C1(噪声工况) 1~20周期 0.647 5 1.301 3 0.356 0 1.206 2 C2 1~20周期 0.085 3 0.253 0 0.040 1 0.249 1 C3 第1周期 0.076 4 0.254 8 0.035 6 0.104 7 第20周期 0.006 9 0.027 4 0.002 9 0.012 2 C3(噪声工况) 第1周期 0.211 1 0.602 6 0.102 5 0.272 3 第20周期 0.052 5 0.176 8 0.026 9 0.096 4 -
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