高性能交直交牵引变电所主电路结构及控制策略研究

Research on Main Circuit Structure and Control Strategy ofHigh Performance AC-DC-AC Traction Substation

交直交牵引变电所可以实现电气化铁路的电能质量综合治理,并具备贯通供电的能力。然而,传统交直交牵引变电所方案在既有牵引变电所基础上的改造难度大,适应性差,且故障工况下容错性能差。针对该问题,提出了一种适应性强且容错性好的交直交牵引变电所方案。该方案保留了传统牵引变电所的主电路形式,并在三相-两相牵引变压器的副边绕组分别接入一套整流器,将直流环节并联,形成公共直流母线。逆变器直流输入端接入公共直流母线,输出端接入牵引网,解决了电能质量和电分相问题。相比于现有的交直交牵引变电所方案,所提方案的改造难度小、适应性强、可靠性高。在MATLAB/Simulink中建立了仿真模型并进行了仿真分析,验证了该方案的可行性和正确性。

AC-DC-AC traction substation can realize the comprehensive treatment of power quality of electrified railway and has the ability of continuous power supply.However,the traditional AC-DC-AC traction substation scheme is difficult to transform based on the existing traction substation,and has weak adaptability and poor fault tolerance performance under the fault conditions.To solve these problems,a scheme of AC-DC-AC traction substation with strong adaptability and high fault tolerance is proposed.The scheme retains the main circuit form of the traditional traction substation,and it connects a set of rectifiers to the secondary windings of the three-phase-two-phase traction transformer respectively,and the DC-links is connected in parallel to form the common DC bus.The DC input of the inverter is connected to the common DC bus and the output is connected to the traction network,which solves the problems of power quality and phase separation.Compared with the existing AC-DC-AC traction substation scheme,the proposed scheme is of little difficulty,strong adaptability and high reliability.The simulation model is established in MATLAB/Simulink and the simulation analysis is carried out,which verifies the feasibility and correctness of the scheme.