The invention provides a through in-phase traction power supply system based on a balance transformer and a four-port MMC. The system is formed by connecting a plurality of through type in-phase traction substations into mutually communicated contact networks, and each substation comprises two traction transformers T1 and T2 adopting a three-phase/two-phase balanced wiring form, and a static powerconverter SPC with three input ports and one output port; three-phase primary side ports of T1 and T2 are connected with three phases of a synchronous public alternating current power grid through acircuit breaker, three-phase secondary side ports of T1 and T2 are connected with three input ports of an SPC respectively, and an output port of the SPC is connected with a traction bus; the SPC is formed by connecting k four-port modular multilevel converters (4P-MMC) in parallel; each 4P-MMC comprises four phases, and each phase is formed by connecting an upper bridge arm and a lower bridge armin series; the midpoints of the three phases of each 4P-MMC are connected with the corresponding input ports of the SPC through three-phase circuit breakers respectively; and the midpoints of the fourth phases of each 4P-MMC are connected with the output ports of the SPC through circuit breakers respectively. The power supply system provided by the invention has the advantages of simple wiring and low cost.
本发明提出的一种基于平衡变压器和四端口MMC的贯通同相牵引供电系统,由多个贯通式同相牵引变电所接入相互连通的接触网组成,各变电所包括两个采用三相/两相平衡接线形式的牵引变压器T和T、具有三个输入和一个输出端口的静止功率转换器SPC;T和T的三相原边端口由断路器接入同步公共交流电网的三相,T和T的三相副边端口分别均接入SPC的三个输入端口,SPC的输出端口接入牵引母线;SPC由k个四端口模块化多电平变流器4P‑MMC并联组成,各4P‑MMC均分别包括四相,每相由上下桥臂串联组成,各4P‑MMC的三相中点分别通过三相断路器接入SPC的对应输入端口,各4P‑MMC的第四相中点分别由断路器接入SPC的输出端口。本发明具有接线简单、成本低的优势。
Through in-phase traction power supply system based on balance transformer and four-port MMC
基于平衡变压器和四端口MMC的贯通同相牵引供电系统
24.07.2020
Patent
Elektronische Ressource
Chinesisch
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