弓网燃弧电流扰动的HHT(希尔伯特黄变换)分析

地铁线路接触网的弓网具有良好的受流质量是保障列车运营安全的前提,弓网燃弧则是评价弓网受流质量最直接的指标,而不同的燃弧强度会伴随着不同程度的牵引电流扰动。改进了HHT(希尔伯特-黄变换)中的EMD(经验模态分解)算法及EMD能量熵,并用于牵引电流扰动分析。通过对广州地铁2号线、3号线的数据分析发现,EMD能量熵能有效提取到牵引电流的扰动特征,且牵引电流扰动越严重,信号就越复杂,能量就越分散,对应的EMD能量熵也越大。

HHT Analysis of Pantograph Catenary Arc Current Disturb-ance

Pantograph catenary with good quality of current collection is the premise to guarantee the operation safety of rail transit.The arc is the most direct index in the evalu-ation of the pantograph catenary quality.Different arc in-tensities are inevitably accompanied by different degrees of traction current disturbance.An improved EMD algorithm and EMD energy entropy are proposed and used for the a-nalysis of traction current disturbance.Through the data a-nalysis of the Guangzhou metro Line 2 and Line 3,the EMD energy entropy can be effectively extracted from the disturbance of the traction current.The more serious the traction current disturbance,the more complex the signal is,same way the greater energy dispersionand the higher EMD energy entropy.