基于滑模控制的牵引网网压低频振荡抑制方法

A Novel Approach to Low Frequency Oscillation Suppression of Traction Network Voltage Based on SMC

针对高速铁路牵引网低频振荡造成动车组牵引封锁的现象,提出了一种基于滑模控制的动车组网侧整流器控制策略。首先,推导了CRH5型动车组网侧单相整流器在dq旋转坐标系下的状态空间数学模型;其次,详细论述了控制策略原理和设计过程,包括外环电压滑模面与内环电流控制率的求取;最后,在Matlab/Simulink与RT-LAB平台上搭建了基于滑模控制器的双重化仿真模型,并与传统线性比例积分（proportional integral,PI）控制策略以及两种对比于PI控制响应性能更好的新型控制策略：基于互联和阻尼分配的无源控制（无源控制）和基于模型的预测电流控制控制（预测控制）的仿真试验效果进行了比较,结果证明滑模控制具有更好的动、静态特性。为进一步验证滑模控制对低频振荡的抑制效果,搭建了基于滑模控制与PI控制的多车接入的车网耦合系统仿真模型,仿真结果证明滑模控制可以有效地抑制低频振荡的发生。

Aiming at the phenomenon of traction blockades due to low-frequency oscillation, a control strategy of electric multiple unit（EMU） line-side converter based on sliding mode control（SMC） is proposed in this paper. Firstly, the mathematical model of state space of CRH5 EMU line-side converter in d-q reference frame is deduced. Then, the principles and design process of the control strategy, related to outer loop voltage sliding mode surface and inner loop current control law, are discussed in detail. Lastly, simulation model of doubly-redundant line-side converter of EMUs is built on Matlab/Simulink and RT-LAB platforms. Simulation results are analyzed and compared with traditional linear proportional integral（PI） control and control strategies with better response performance compared to PI control, namely interconnection and damping assignment passivity based control（passivity-based control） and model-based predictive current control（predictive control）. It shows that SMC has better dynamic and static characteristics. In order to further verify suppressing effect of SMC, many EMU accessed vehicle-grid coupling systems are built based on SMC and PI control, and simulation results show that SMC can effectively suppress occurrence of low frequency oscillation.