基于车网耦合的高速铁路AT供电系统谐振特性

为研究高速列车与AT供电系统之间电气耦合（简称车网耦合）引起的谐波谐振，构建了基于节点导纳方程的高速铁路AT供电系统数学模型和基于高速列车功率源特性以及等效阻抗的谐波源模型，提出了基于车网耦合的高速铁路AT供电系统谐波谐振评估算法，研究了3种AT供电模式、3种AT牵引网运行方式以及不同AT变压器漏感大小对系统谐振特性的影响，分析了系统阻频特性与相频特性，指出并联和串联谐振点及其变化规律.仿真分析表明:列车位于不同AT段时3种AT供电模式下并联谐振点和串联谐振点均存在差异，牵引供电系统运行方式的多变性也造成了串联和并联谐振点的偏移，AT漏抗越大则谐振点数目越多而第1个串联谐振点频率越低. 

Harmonic Resonance of AT Power Supply System of High Speed Railway Based on Train-Network Coupling

To study the harmonic resonance caused by the electrical coupling between high speed train and AT power supply system, a mathematic model of AT power supply system of high speed railway based on nodal admittance equation and a harmonic model of high speed train based on the power source characteristic and the equivalent impedance were built. The evaluation algorithm for the harmonic resonance of AT power supply system of high speed railway based on train-network coupling was propsed. The effect on the harmonic resonance of three AT models, three traction network operation modes and different leakage impedances were discussed, and their impedance-frequency and phase-frequency characteristics were analyzed. The variation rules of parallel and series resonant points were summarized. Simulation results show that three AT modes have different parallel and series resonant points, and different power supply models lead to the shift of resonant points. The increasing of AT transformer leakage resistance causes more resonance points and lower frequency at first series resonant point.