郑州轨道交通供电系统谐波分析及影响研究

结合郑州轨道交通一号线牵引列车的电气参数,对四种负载工况下牵引运行时列车从牵引网获取的最大功率进行估算,计算列车牵引负荷;针对列车在初期、近期、远期以及典型负载工况下牵引运行的情况,利用MATLAB/Simulink软件建立郑州地铁供电系统交流侧仿真模型,通过与M文件进行交互,实现了城市轨道交通交直流潮流计算;建立整流机组的谐波源模型,结合各元件的谐波数学模型形成等值电路,编写相应程序分析谐波潮流,根据计算结果分析郑州轨道交通的谐波特性以及对城市配网的影响程度。

Study on Zhengzhou Metro Traction Power System Harmonic Analysis and Impact

According to the electrical parameters of subway train of Zhengzhou metro transit line 1,this paper estimates the maximum traction power which is acquired from the traction networks when the subway train is towed with four kinds of load conditions.Then mathematical models of traction load are built on the basis of the results.Taking advantage of Simulink tool in MATLAB, the AC simulation models of the metro power system are built when the train is towed in early, short,long term and typical kinds of load conditions and the AC-DC power flow calculations are completed through the interactive operation with computer programs.Besides,this paper builds an equivalent model of 24-pulse rectifier and makes up compute programs to calculate the harmonic power flow by forming the harmonic equivalent circuit with each harmonic mathematical model. Finally,the harmonic characteristics of Zhengzhou Metro and the influences of harmonics on urban distribution network can be achieved according to the calculation results of harmonic power flow and we can take some effective measures to reduce the influence of harmonics.