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提出了一种适用于模块化铁路功率调节系统的并联等效模型与环流抑制策略。首先分析了一种模块化并联铁路功率调节器(railway static power conditioner,RPC)的拓扑结构,此拓扑具有模块扩展方便的特点,且当单个子模块由于故障而被切除时仍可运行。而后根据所提的拓扑建立了系统的等效电路图,分析了系统环流的产生及危害。再由环流数学模型提出了分布式控制方案,并将简化PWM调制策略引入到模块化RPC的环流抑制当中。最后以4个并联的模块化RPC系统为例搭建了系统仿真,验证了所提控制方法的可行性。
A parallel equivalent model and circulation suppression strategy suitable for modularized railway power regulation system are proposed. Firstly, the topology of a modular parallel railway static power conditioner (RPC) is analyzed. The topology has the advantages of convenient module expansion and can operate when a single sub-module is cut off due to a fault. Then based on the proposed topology to establish the equivalent circuit diagram of the system, the analysis of the system circulation and harm. Then, a distributed control scheme is proposed by the mathematical model of the circulating current, and a simplified PWM modulation strategy is introduced into the circulation suppression of the modular RPC. Finally, the system simulation is built with 4 parallel modular RPC systems as an example to verify the feasibility of the proposed control method.