车网系统谐波模型及谐振特性仿真研究

Simulation Study of Resonance Characteristics and Harmonic Model for Locomotive-grid System

为了仿真研究车网系统谐振机理,需准确建立车网系统的谐波模型。文章对铁路牵引供电系统关键子部件的谐波模型建立方法进行了研究,提出了一种基于伴随网络法的机车变流器通用谐波模型建立方法,其将变流器开关的电磁暂态模型转变为电流源并联电阻支路的稳态模型,从而加快了仿真速度。基于所建立的车网系统谐波模型,文章对车网系统的谐振特性进行了仿真分析,并提出了一种准确模拟车网谐振特性的方法。仿真结果表明,该机车变流器通用谐波模型相较于传统机车谐波模型,仿真速度加快3倍以上。

In order to study the resonance characteristics of locomotive-grid system by simulation,an accurate harmonic model is needed.The method for building harmonic models of pivotal parts of traction power supply system was studied,and then,based on the attendant network method,a method for building a universal harmonic model of converter for locomotive was presented,which could change transient switch model to steady current source connected with resistance branch model,so that the simulation speed could be improved.Based on the harmonic model of locomotives-grid system,resonance characteristics of the system were studied by simulation,some basic conclusions were summarized,and an efficient method to accurately simulate resonance characteristics of locomotive-grid system was proposed.Simulation results show that the universal harmonic model of converter for locomotive can improve the simulation speed to three times faster than that of the traditional one.