V型接线变压器和两相三线制变流器的同相供电系统

Co-phase Power Supply System Based on V-connection Transformer and Two-phase Three-wire Converter

针对现有采用背靠背结构变流器的同相供电系统存在开关支路多、控制复杂等不足,本文提出了两相三线制变流器的同相供电系统结构。首先提出了该系统的拓扑结构,对系统补偿原理进行了分析;其次,利用负序平衡补偿原理,提出了负序和谐波补偿实时检测及控制方法;最后,在Matlab/Simulink仿真平台上建立了电气仿真模型,结果表明该系统能够有效治理牵引变电所负序和谐波问题。仿真结果验证了本文所提结构和方法的有效性。

There exist some disadvantages in the traditional co-phase power supply system based on a back-to-back structure converter,such as numerous switching branches and complex control.Accordingly,a co-phase power supply system based on a two-phase three-wire converter was proposed in this paper.First,the topological structure of the sys-tem was established,and its compensation principle was analyzed.Then,a real-time detection and control method for the negative-sequence and harmonic compensation was proposed using the negative-sequence balance compensation principle.Finally,an electrical simulation model was built in Matlab/Simulink platform,showing that the system can ef-fectively control the negative-sequences and harmonics in a traction substation.The simulation result proved the validity of the proposed structure and the corresponding method.