基于模态分析的全并联AT网动态谐波谐振研究

为防止牵引网谐波谐振引起的系统过电压,达到及时预防和抑制的目的,针对中国高速铁路全并联自耦变压器(auto-transformer,AT)供电方式,采用模态分析方法对系统的节点导纳矩阵进行分析处理,通过解耦与特征值求取确定其谐振信息。研究机车功率变化、机车位置移动等动态条件下的牵引网谐振规律。并针对谐振频率在某一区间或范围变化,引出谐振带的概念。通过与频谱分析法对比,证明模态分析方法能有效识别系统的谐振频率,并且可用于分析由动态运行的机车产生的动态谐波谐振。

Modal Analysis Based Research on Dynamic Harmonic Resonance of All-Parallel Autotransformer Traction Supply Network

To prevent overvoltage caused by harmonic resonance occurred in traction supply network and implement timely prevention and suppression of the overvoltage,according to all parallel autotransformer power supply mode for China’s high-speed railway the modal analysis is used to analyze and process nodal admittance matrix of traction supply system,and by means of decoupling and solving eigenvalue the resonance information is obtained to research the law of resonance occurred in traction supply network under such dynamic conditions as variation of locomotive power and position shifting of locomotive.In allusion to the variation of resonance frequency in a certain interval or range a concept of resonance band is drawn out.By means of comparing the results from the method based on modal analysis with that from frequency spectrum analysis,it is proved that the modal analysis based method can effectively recognize resonance frequency of traction supply system and the method can be used to analyze dynamic harmonic resonance caused by locomotive being dynamically operated.