摘要
轨道车辆目前所使用的低频线路变压器受低效和超重问题所困。未来的牵引传动系统可能直接与电网相连,无需该类变压器。典型的无变压器传动系统通常由多个使用HV-IGBT(高压绝缘栅双极型晶体管)的中等电压规格变流器串联而成。设计之初先对6.5kVIGBT和目前已商业应用于牵引领域的3.3kV、4.5kVIGBT的开关特性和损耗进行比较,基于所考虑的HV-IGBT,对多电平变流器的特点及其在无变压器系统的应用进行了评估。本文侧重于变流器的损耗分析,同时简要地探讨了可靠性和谐波频谱问题。综合考虑上述各方面因素,三电平中点箝位变流器是一种较理想的方案,适用于无变压器牵引系统,可作为网侧变流器和电机侧变流器使用。
The low-frequency line transformer in today＇s AC rail vehicles suffers from poor efficiency and a substantial weight. Future traction drives may operate directly from the mains without this transformer. A feasible concept for a transformerless drive system consists of series connected medium voltage converters applying modern HV-IGBTs. In a first design step, the switching characteristics and losses of 6.5 kV are compared to 3.3 kV and 4.5 kV IGBTs which are already commercially used in traction applications. Based on the considered HV-IGBTs, the properties of multilevel converters are analyzed and their applicability to the transformerless system is evaluated. The paper focuses on a loss analysis of the converters. Reliability aspects and harmonic spectra are briefly discussed. Taking these design aspects into account, the three-level NPC converter turns out to be a reasonable solution to realize line and motor converter modules in a tranformerless traction system.
出处
《变流技术与电力牵引》
2006年第4期24-31,共8页
Converter Technology & Electric Traction
