基于滑模控制的牵引变流器网侧有源滤波器电流控制策略

针对有源滤波器电流跟踪控制模块中现在控制方法灵活性较差、控制精度较低的不足,基于滑模变结构原理,对应用于牵引变流器网侧有源滤波器中的电流跟踪控制策略进行了研究。首先根据滑模控制原理从滑模切换面函数及控制函数两方面对控制策略进行了设计;在此基础上根据可达性条件从限制抖振幅度的角度对控制函数进行了优化;最后针对动车组不同运行工况,对所提控制策略在网侧有源滤波器中的控制效果进行了仿真验证。仿真结果表明,所提电流控制策略具有较好的网侧谐波补偿和抑制效果以及较高的电流跟踪控制精度,达到了预期的目标。

Current Control Strategy of Active Power Filter on Network Side of Traction Converter Based on Sliding Mode Control

Aiming at the shortcomings of poor flexibility and low control precision of the current control method in current control module of active power filter, the current tracking control strategy applied to active power filter of traction converter is designed based on the sliding mode control principle. Firstly, the control strategy including sliding mode switching surface function and control function is designed according to the sliding mode control principle. Based on the reachability condition, the control function is optimized from the point of the limitation of buffeting amplitude. Finally, the control effect of the proposed control strategy of active power filter on the network side is simulated and verified facing different operating conditions. The simulation results show that the proposed current control strategy has better harmonic compensation and suppression effect and higher current tracking control precision, and achieves the expected target.