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针对目前电气化铁道牵引供电网存在谐波污染严重的问题,提出了一种具有谐波屏蔽功能的改进型Vv牵引变压器。首先介绍了基于传统Vv接线牵引变压器的牵引变电所接线方案;在此基础上,给出了改进型Vv接线牵引变压器的接线方案,并建立了谐波数学模型;基于谐波数学模型,分析求得滤波绕组的零阻抗设计和配套滤波器的全调谐设计是实现牵引侧谐波有效抑制的重要条件;最后,以某一牵引供电站实测数据为参考,建立了传统方案和改进方案的系统仿真模型。仿真结果表明:改进型Vv牵引变压器可将谐波电流有效地抑制在牵引侧,使得高压侧电流基本接近正弦波,谐波抑制效果显著,且滤波绕组电压等级较低,可有效降低滤波器的成本。
Aiming at the problem of serious harmonic pollution in the electrified railway traction power supply network, an improved Vv traction transformer with harmonic shielding function is proposed. Firstly, the wiring scheme of traction substation based on traditional Vv wiring traction transformer is introduced. Based on this, the wiring scheme of improved Vv wiring traction transformer is given and the harmonic mathematical model is established. Based on the harmonic mathematical model, The zero-impedance design of the filter windings and the full-tuned design of the matched filter are important conditions for effective suppression of the traction-side harmonics. Finally, based on the measured data of a traction power station, a system of traditional solutions and improvement programs Simulation model. The simulation results show that the improved Vv traction transformer can effectively suppress the harmonic current at the traction side and make the high-side current almost sinusoidally, the harmonic suppression effect is remarkable and the filter winding voltage level is lower, which can effectively reduce the filter’s cost.