低阻接地故障有源电压消弧算法性能分析和改进

发布时间：2018-08-06 21:13

【摘要】：谐振接地系统发生单相接地故障时,有源电压消弧法的灭弧性能缺少分析和论证。在考虑线路压降的情况下,给出了有源电压消弧后的故障点电流表达式及变化规律,表明在故障点过渡电阻较大时,有源电压消弧可以有效补偿故障点电流实现可靠消弧,而在过渡电阻较小、负荷电流较大、故障距离较远时,有源电压消弧反而会导致故障点电流变大,甚至达上百A,严重影响熄弧效果。提出有源电压消弧算法的改进措施,低阻接地时将故障相电压控制到一定范围内,确保故障点电流不会增大,该方法无需测量系统参数,可适应线路结构的动态变化,有利于有源电压消弧法在现场实际中的应用和完善,仿真验证了分析及改进算法的正确性。
[Abstract]:When the single-phase grounding fault occurs in the resonant grounding system, the arc-extinguishing performance of the active voltage suppression method is lack of analysis and demonstration. Considering the voltage drop of the line, the expression of the fault point current after active voltage arc suppression and its variation rule are given. It is shown that the active voltage arc suppression can effectively compensate the fault point current to achieve reliable arc suppression when the fault point transition resistance is large. However, when the transition resistance is small, the load current is large, and the fault distance is long, the active voltage arc suppression will cause the fault point current to become larger, even up to hundreds of A, which will seriously affect the arc extinguishing effect. An improved method of active voltage arc-suppression algorithm is proposed to control the fault phase voltage within a certain range under low resistance grounding, so as to ensure that the fault point current will not increase. This method can adapt to the dynamic changes of the circuit structure without measuring system parameters. It is beneficial to the application and perfection of the active voltage arc-suppression method in the field, and the correctness of the analysis and the improved algorithm is verified by simulation.
【作者单位】：中国石油大学(华东)信息与控制工程学院山东省;山东理工大学智能电网研究中心;
【基金】：国家自然科学基金资助项目(51477184)~~
【分类号】：TM862

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