Algorithm for Power Flow of Electric Traction Network Based on Equivalent Circuit of AT-Fed System
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摘要: 在自耦变压器(AT)等值电路的基础上,提出了牵引网潮流的改进算法.改进算法中将机车视作恒功率模型,考虑了AT的漏抗值,利用迭代法和叠加原理进行供电区间多列车运行的潮流计算.该算法能计算AT漏抗值对牵引网电气特性的影响.仿真结果表明,对单列车情况迭代5次左右即收敛,对4列车情况迭代10次左右收敛;算法对供电区间任意位置单列和多列车的情况均适用,且较AT等值电路的一般算法精确.Abstract: An improved algorithm based on equivalent circuit of autotransformer-fed(AT-fed) systems was proposed to calculate power flows of electric traction networks.In the proposed algorithm,locomotives are treated as a constant power model,and the leakage impedance of ATs is considered.Power flows when there are multiple trains are calculated by the principle of superposition and iteration.The influence of leakage impedance ATs on the performances of electric traction networks can be simulated with the proposed algorithm.Results of simulation show that the algorithm converges after about 5 iterations for single train,and about 10 iterations for 4 trains;it can solve the power flow problem of AT-fed efficiently regardless of the number and positions of trains;and it is more accurate than the commonly used algorithms based on equivalent circuit of AT-fed system.
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Key words:
- traction network /
- AT-fed system /
- equivalent circuit /
- leakage impedance /
- power flow calculation
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