偏磁式消弧线圈自动调谐新原理及应用

A new automatic tuning principle and its application of arc-suppression coil with magnetic bias

通过对偏磁式消弧线圈原有控制方法的分析,提出了新的电网电容电流自动跟踪测量方法,即通过测量中性点电流及其相角差来检测,进而提出了消弧线圈的双机控制原理,并对该方法进行了仿真分析。研制出基于上述原理的调谐控制器。给出了控制器的软硬件框图,并在低压模拟电网上进行了实验。实验结果表明该方法电容电流检测误差小于2%,动态过程的时间小于2个周期。该方法显著提高了电容电流的计算精度,并将进一步在实践中应用。

With the analysis of the former control method of the arc-suppression coil with magnetic bias, the paper proposes a new method for automatically tracing the capacitance current of power system, which measures single-phase-to-earth capacitance current of the power network by measuring neutral point current and its phase-angle difference. Then the principle of controlling two arc-suppressions is presented, and this method is simulated and analyzed, based on which we have developed a tuning controller. And the block diagrams of the tuning controller′s software and hardware are presented. The method is validated on the low voltage simulation network, and the result shows that the error in measuring capacitance current is less than 2% and the transient process of compensation is less than two cycles. The method obviously improves the precision of capacitance current calculation and will be further used in practice.