车载网侧变流器电流谐波优化控制策略

Optimal Control Strategy of Current Harmonic for Onboard Line side Converter

摘要:

交流传动电力机车和电动车组网侧变流器产生的电流谐波频谱分布范围较宽，容易激起牵引网谐振.在分析了理想条件下网侧电流谐波特性的基础上，针对网侧变流器目前通常采用的多重化瞬态电流控制策略，通过对比指出了其在谐波性能方面的问题.为解决这些问题，提出了基于平均电流反馈和基于原边电流反馈两种优化的瞬态电流控制策略.通过仿真分析和线路运行试验验证了优化控制策略的有效性，可将原边电流总谐波畸变率降低至1%左右，显著提升了网侧谐波性能，并有效地抑制了车网谐振.

Abstract:

The running of line side converter of alternating current(AC) drive electric locomotive and electric multiple units will generate current harmonic, and the frequency range of the current harmonic is wide. This will easily cause resonance between the train and the power supply grid. The harmonic characteristic of line side current in ideal conditions is analyzed; the problem about harmonic performance of usual transient current control strategy for multiple line side converters is discovered through comparison. In order to solve the problem, two optimal transient current control strategies based on average current feedback and primary current feedback are proposed. The simulation analysis and the line testing verify the validity of optimal control strategy. The total harmonic distortion(THD) for primary current fall to about 1%. The line side harmonic characteristic is improved visibly, and the resonance between the train and power grid is suppressed effectively.