多电平铁路功率调节器的无源控制方法

Passivity-based Control Method for Multi-level Railway Power Conditioner

为了治理铁路系统的电能质量问题,研究了一种多电平铁路功率调节器(MRPC),其采用多电平级联型H桥链,只需要通过一个隔离变压器与牵引供电臂连接。若采用同相供电方式,MRPC可直接与牵引供电臂连接,不再需要隔离变压器。根据MRPC的拓扑结构推出了其等效电路图,并对其进行了数学建模。在此基础上,通过Park(αβ/dq)变换建立了dq坐标系下的欧拉—拉格朗日(EL)模型,分析了系统的无源性,提出了一种无源性控制方法,并设计了无源控制器。仿真和实验结果表明,该控制方法能提高MRPC对控制参数扰动的鲁棒性,改善牵引网电能质量。

In order to control the railway system power quality problems,a multilevel railway power conditioner（ MRPC） composed of cascaded H-bridge cells is studied. It can be connected to the traction feeders directly without isolating transformers in the co-phase supply system. The equivalent circuit diagram is derived according to the topology of the MRPC,and mathematical modeling is performed. On this basis, a Euler-Lagrange mathematical model in dq frame is developed by Park transformation（ αβ/dq）.Furthermore,the passivity of the system is analyzed,and a passivity-based control method is proposed by injecting damping items into the system. Simulation and experimental results show that the proposed control method with its strong robustness can improve the power quality of the traction system.