基于有源逆变技术的综合消弧方法

Comprehensive Arc-suppression Method Based on Active Inverter Technology

我国配电网中性点大多为不接地或经消弧线圈接地,针对消弧线圈无法完全补偿故障电流,消弧效果不佳的问题,提出了一种消弧线圈与有源逆变装置相结合的综合消弧方法。在配电网中发生单相接地故障时,首先投入消弧线圈进行无源消弧,出现电流残流而无法自熄的情形,然后投入有源逆变装置分相注入补偿电流进行有源消弧,以完成对故障输入电流的全补偿。仿真结果表明,该方法将消弧线圈和有源逆变装置灵活结合,高效补偿了配电网单相接地故障电流,不仅实现了可靠熄弧,而且适应于不同接地电阻的故障情况。

The neutral points of distribution network in China are mostly ungrounded or grounded through arc-suppression coil.Aiming at the problem that arc-suppression coil cannot completely compensate fault current and the arc-suppression effect is not good,a comprehensive arc-suppression method combining arc-suppression coil and active inverter is proposed.When the single-phase grounding fault occurs in the distribution network,the arc suppression coil is first put into passive arc suppression,the current residual occurs and cannot be self-extinguished.Then,the active inverter is put into the phase-divided compensation current for active arc suppression,so as to complete the full compensation of the fault input current.The simulation results show thatthis method combines arc suppression coil and active inverter flexibly,and effectively compensates the single-phase grounding fault current of distribution network.This method not only realizes reliable arc extinguishing,but also adapts to the fault conditions of different grounding resistances.