AI 中文总结
研究电力铁路中机车整流器谐波不稳定问题，构建扰动频率和 PWM 边带分量动态传播，推导多频输入导纳模型并转换为 SISO 模型，揭示不同因素对系统谐波稳定性的影响，该模型在高频更准确。
AI 中文摘要
电力铁路谐波不稳定问题在高频范围内很常见。传统变换器小信号平均模型的有效频率低于 1/2 开关频率，因为忽略了脉宽调制（PWM）边带谐波分量。本文首先构建了扰动频率和产生的 PWM 边带分量的动态传播，然后推导了机车整流器的多频输入导纳模型。接着使用导纳转换方法将多频模型转换为单输入单输出（SISO）模型，同时保留边带频率耦合。所提出的 SISO 模型在高于 1/2 开关频率的范围内比传统小信号平均模型更准确。发现 PWM 边带谐波在高于 1/2 开关频率时主导机车整流器的输入导纳特性。最后，基于所提出的模型，通过硬件在环（HIL）结果揭示了不同开关频率、控制带宽和牵引网络阻抗对系统谐波稳定性的影响。
英文摘要
Electrical railway harmonic instability issues are common in the high-frequency range. The effective frequency of the traditional converter's small-signal averaging model is below 1/2 switching frequency since the pulse width modulation (PWM) sideband harmonic components are ignored. In this article, the dynamic propagations of perturbation frequency and the generated PWM sideband components are constructed first. Then the locomotive rectifier's multi-frequency input-admittance model is derived appropriately. Afterward, an admittance conversion approach is used to convert the multi-frequency model into the single-input-single-output (SISO) model whereas retaining the sideband frequency couplings. The proposed SISO model is more accurate than the traditional small-signal averaging model in the frequency range higher than 1 / 2 switching frequency. It is found that PWM sideband harmonics dominate the locomotive rectifier's input-admittance characteristic higher than 1 / 2 switching frequency. Finally, based on the proposed model, the influence of different switching frequencies, control bandwidths, and traction network impedance on system harmonic stability is revealed by the hardware-in-the-loop (HIL) results.
Comments11 pages. Accepted manuscript
Journal refIEEE Transactions on Transportation Electrification, vol. 8, no. 3, pp. 3848-3858, 2022
