可控磁饱和电抗器在中压电网接地系统中运行状况的建模与仿真

马淋淋 梁艳萍

摘 要：針对10-35 kV的中压电网经弧线圈接地运行方式中，消弧线圈的补偿度不能根据电容电流大小连续平滑调节的问题，提出了一种基于可控磁饱和电抗器的新型消弧线圈。并以一台额定电压为10 kV的可控磁饱和电抗器为研究对象，基于磁路分段的原理，充分考虑直交流绕组共同作用情况下磁路和电路的非线性问题，建立了消弧线圈的“磁路-电路耦合仿真模型”，并在系统模型中进行了仿真实验。对实验波形的计算结果表明，该消弧线圈可在电网发生单相接地故障时，能够根据单相接地电容电流的大小平滑调整补偿度，使接地电流得到有效抑制，保证接地电弧顺利自熄，提高系统的供电可靠性，并给出了谐波的抑制策略。

关键词：可控磁饱和电抗器；消弧线圈；单相接地故障；中性点；谐振

DOI：10.15938/j.emc.（编辑填写）

中图分类号：TM 474 文献标志码：A 文章编号：1007 -449X（2018）00-0000-00（编辑填写）

Abstract： A new arc suppression coil based on magnetically controlled saturated reactor is proposed aimed to solve compensation degree of arc suppression coil cannot be continuously adjusted smoothly according to the capacitance current at 10-35kV Medium-voltage power network. Taking a magnetically controlled saturated reactor with rated voltage of 10kV as the research object， based on principle of magnetic circuit segmentation， the coupling simulation model of magnetic circuit and circuit of arc suppression coil is established considering the nonlinear problem of magnetic circuit and circuit which is under the combined action of AC winding and DC winding. The calculation results of the experimental waveform show that the suppression coil can adjust compensation degree smoothly according to the size of the single-phase grounding capacitor current when single phase earth fault occurs in power grid. Therefore the grounding current can be effectively suppressed， the grounding arc can be smoothly extinguished， and the power supply reliability of the system can be improved， and the harmonic suppression strategy is given.

Keywords： controllable magnetic saturation reactor， arc-extinguishing coil， single phase ground fault； neutral point； resonance