城市轨道交通供电系统谐波谐振剖析

城市轨道交通供电系统在一座主变电所支援供电运行方式下运行，供电电缆较长，电缆的对地电容与主 变压器漏感可能发生谐波参数匹配，放大系统内的背景谐波，引发谐振。以某市 1 号线地铁供电系统调试期间发 生的一起 11 次谐波谐振事故为背景，搭建谐振电路模型，分析城市轨道交通供电系统谐波谐振产生的原因，即 系统背景中的 11 次谐波被供电电缆对地分布电容和主变压器漏感构成的并联回路放大，分析结果与现场记录数 据一致。同时，提出采取一些措施：前期工程设计计算系统谐波阻抗参数，严格限制背景谐波含量，使其满足规 范要求，评估整流器生产工艺，明确 SVG 滤波功能等，以提高供电系统抑制谐波的能力。

Harmonic Resonance of Urban Transit Power Supply System

When an urban transit power supply system (UTPSS) operates in power supply mode supported by only one main substation, the required power supply cable is long. This can result in harmonic parameter-matching between the ground-toground capacitance of the cable and the main transformer leakage inductance, which can amplify background harmonics in the system. Based on a UTPSS resonant accident that occurred during the commissioning of the subway of Line 1 in a city, this study built a resonant circuit model and analyzed the reason for the harmonic resonance of this UTPSS. Specifically, the resonance was originally generated by the 11th background harmonic and amplified by a parallel circuit consisting of the ground-to-ground capacitance of the cable and the main transformer leakage inductance. The analysis results were consistent with field-recorded data. Furthermore, this paper proposes several measures to suppress the resonance of the UTPSS in the subway: calculate the harmonic impedance parameters in the preliminary engineering design stage, strictly limit background harmonics to meet requirements, evaluate converter manufacturing techniques, and confirm the filter functions of SVG.