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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 solve the power quality problem of railway system, a multi-level railway power regulator (MRPC) is studied, which adopts multi-level cascaded H-bridge and only needs to connect with the traction power supply arm through an isolation transformer. If the same phase power supply, MRPC can be directly connected with the traction power supply arm, no longer need to isolate the transformer. According to the topological structure of MRPC, its equivalent circuit is introduced and its mathematical modeling is carried out. On this basis, the Eulerian-Lagrangian (EL) model in the dq coordinate system is established by Park (αβ / dq) transform, the passiveness of the system is analyzed, and a passive control method is proposed. And designed a passive controller. Simulation and experimental results show that the proposed control method can improve the robustness of MRPC to disturbance of control parameters and improve the power quality of traction network.