基于模块化多电平的铁路功率调节器直接功率控制策略

Direct Power Control Strategy of Railway Static Power Conditioner Based on Modular Multilevel Converter

为解决铁路供电负序问题,同时兼顾无功补偿与谐波治理,由2个单相模块化多电平换流器(modular multilevel converter,MMC)背靠背连接构造铁路功率调节器(MMC-RPC),并直接接入牵引网。较传统RPC而言,取消了降压变压器,提高了直流电压,减小了直流端电流。针对铁路供电,分析单相系统的电压与功率间的数学模型,设计了一种无需系统角频率和电感参数的直接功率控制策略(direct power control,DPC)。以V/v牵引变为例,在Matlab/Simulink中搭建仿真模型,仿真结果验证了所提策略的有效性。

To solve problem of negative sequence components and to compensate reactive power and eliminate harmonics, back-to-back connection structure of railway static power conditioner（RPC） connected to traction network directly with two single-phase modular multilevel converters（MMC） is designed. Compared with traditional RPC, MMC-RPC eliminates step-down transformer to increase DC voltage and reduce DC current. A direct power control strategy（DPC） without angular frequency and inductance parameters using mathematical model of single-phase system voltage and power is proposed according to analysis of railway power supply. Taking V/v traction as example, a simulation model is constructed in MATLAB/Simulink. The results show that the proposed strategy is effective.