基于谐波耦合机理的V/v接线牵引供电系统谐波阻抗辨识方法  

Harmonic Impedance Identification Method of V/v Connection Traction Power Supply System Based on Harmonic Coupling Mechanism

作　　者：王迎晨 杨少兵[1] 宋可荐[1] 刘秋降[1] 吴命利[1] 潘朝霞 WANG Yingchen;YANG Shaobing;SONG Kejian;LIU Qiujiang;WU Mingli;PAN Zhaoxia(School of Electrical Engineering,Beijing Jiaotong University,Haidian District,Beijing 100044,China;China Railway Taiyuan Group Co.,Ltd.,Taiyuan 030024,Shanxi Province,China)

机构地区：[1]北京交通大学电气工程学院,北京市海淀区100044 [2]中国铁路太原局集团有限公司,山西省太原市030024

出　　处：《中国电机工程学报》2021年第11期3818-3828,共11页Proceedings of the CSEE

基　　金：中央高校基本科研业务费专项资金资助项目(2020JBZD012);中国铁路总公司科技研究开发计划课题(P2018J001);中国博士后科学基金资助项目(2020M670124)。

摘　　要：随着交–直–交型电力机车的广泛运用,高次谐波引发的牵引供电系统谐振严重威胁电气化铁路安全运行,系统谐波阻抗是研究谐振机理及治理措施的关键参数,但提高谐波阻抗辨识精度具有较大挑战性。该文以V/v接线牵引变压器为算例,提出一种基于谐波耦合模型与谐波阻抗解耦的牵引供电系统谐波阻抗辨识方法。首先,推导不平衡牵引变压器两侧谐波的交互影响,建立牵引供电系统谐波耦合模型。然后,利用复独立分量分析法对谐波耦合模型进行解耦,分离出系统侧与负荷侧谐波阻抗,进而求得牵引变压器端口的总谐波阻抗。与几种传统算法的仿真对比表明,提出的方法在宽频域系统侧与负荷侧阻抗幅值相对大小波动性较强时、背景谐波较大时仍然适用;运用现场实测数据的辨识结果表明,所提方法能准确找到实际系统的谐振频率。With the extensive application of AC-DC-AC electric locomotives, the resonances of traction power supply systems(TPSSs) caused by high-order harmonics seriously threaten the safe operation of electrified railways. Harmonic impedance of a TPSS is the key parameter for studying the resonance mechanism and control measures. However,improving harmonic impedance identification accuracy is of great challenge. Taking V/v traction transformer as an example,this paper proposed a TPSS harmonic impedance identification method based on harmonic coupling model as well as decoupling method. Firstly, the interaction of harmonics on either side of unbalanced traction transformer was derived, and the harmonic coupling model of TPSS was established. Then,the complex independent component analysis was utilized to decouple the model yielding separate harmonic impedance of the system side and load side. As a result, the total harmonic impedance seen from a traction transformer secondary side was obtained through paralleling the two sides. Simulation results verified that the proposed method, compared to the conventional methods, was with greater applicability in a wide frequency range when the impedance ratio of the two sides and the background harmonics were uncertain. Implementing the proposed method to a set of measured data validates that it could find the resonant frequency of a real TPSS.

关 键 词：牵引供电系统 V/v接线牵引变压器 谐波耦合模型 谐波阻抗辨识 复独立分量分析 阻抗频率特性 

分 类 号：TM922.3[电气工程—电力电子与电力传动]