磁集成式LCL滤波器在牵引网高次谐波抑制中的应用

为抑制机车牵引变流器流入牵引网的高次谐波,减少滤波器占用机车的空间,提出一种磁集成式LCL滤波器新方案。为抑制LCL滤波器固有谐振尖峰,提出一种基于无电容电流传感器的有源阻尼瞬态直接电流控制方法;针对LCL滤波器占用空间过大的问题,将牵引绕组端口电感用作第一电感,通过磁集成技术将第二电感集成到牵引主变压器中以减少空心电抗器占用空间;通过Ansoft和MATLAB软件对采用磁集成式LCL滤波器的牵引传动系统进行场路耦合仿真。仿真与实验结果表明,磁集成式LCL滤波器不仅能够有效抑制机车注入牵引网的高次谐波,而且克服了传统LCL滤波器占用空间大的缺点。

Application of magnetic integrated LCL filter in high-order harmonic suppression for traction network

In order to suppress high-order harmonic of the locomotive converter flowing into the traction network and reduce the locomotive space occupied by filter, a new harmonic suppression scheme of magnetic integrated LCL filter is proposed. Firstly, in order to suppress the inherent resonance peak of LCL filter, an active damping transient direct current control method without capacitive current sensor is proposed. Secondly, for the problem that LCL filter occupies too much space, the traction winding port inductance is used as the first inductance, and the magnetic integration technology is employed to integrate the second inductance into the traction main transformer for reducing the air-core reactor space. Finally, the field-circuit coupled simulation of the traction drive system with magnetic integrated LCL filter is performed by Ansoft and MATLAB software. The simulative and experimental results show that the magnetic integrated LCL filter can not only effectively suppress the high-order harmonics of locomotive converter flowing into the traction network, but also overcome the shortcomings of the traditional LCL filter occupying large space.