GIC引发直流偏磁对距离保护Ⅲ段动作性能影响的分析
发布时间：2019-03-16 21:09
【摘要】：详细论述了直流系统单极运行及磁暴引发的变压器直流偏磁的异同点,进而探讨了地磁感应电流(GIC)的等效源建模问题。通过PSCAD/EMTDC平台搭建了计及变压器偏磁效应的双机系统仿真模型,对线路事故过负荷进行了仿真研究,分析评估线路距离保护耐受GIC的能力。仿真结果表明GIC通过中性点接地变压器侵入电力系统后,可能造成变压器铁心不对称饱和,从而使测量阻抗发生周期性波动。距离保护Ⅲ段作为下级变压器的远后备保护,在线路事故过负荷造成负荷转移的情况下,其动作可靠性降低,可能受GIC扰动而发生误动。
[Abstract]:The similarities and differences of DC bias caused by magnetic storm and monopole operation of DC system are discussed in detail. Furthermore, the equivalent source modeling of geomagnetic induced current (GIC) is discussed. The simulation model of two-machine system considering the magnetic bias effect of transformer is set up by PSCAD/EMTDC platform. The over-load of line accident is simulated and the ability of line distance protection and tolerance to GIC is analyzed and evaluated. The simulation results show that when GIC invades the power system through the neutral grounding transformer, it may cause asymmetrical saturation of the core of the transformer, thus causing periodic fluctuation of the measuring impedance. As the remote backup protection of the lower transformer, the operation reliability of the distance protection section 鈪，
本文编号：2441965
[Abstract]:The similarities and differences of DC bias caused by magnetic storm and monopole operation of DC system are discussed in detail. Furthermore, the equivalent source modeling of geomagnetic induced current (GIC) is discussed. The simulation model of two-machine system considering the magnetic bias effect of transformer is set up by PSCAD/EMTDC platform. The over-load of line accident is simulated and the ability of line distance protection and tolerance to GIC is analyzed and evaluated. The simulation results show that when GIC invades the power system through the neutral grounding transformer, it may cause asymmetrical saturation of the core of the transformer, thus causing periodic fluctuation of the measuring impedance. As the remote backup protection of the lower transformer, the operation reliability of the distance protection section 鈪，
本文编号：2441965
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