抑制GIS中VFTO的磁环尺寸优化

Size Optimization of Magnetic Rings for VFTO Suppression in GIS

GIS中的隔离开关操作将会产生高幅值的VFTO,从而损害其设备造成系统故障。为了更加经济地抑制VFTO,提出了基于粒子群优化算法来抑制VFTO最佳铁氧体磁环尺寸的方法。通过模拟GIS中磁环对于VFTO抑制效果的分析,得出了磁环模型等效电阻和等效电感的取值范围;建立磁环尺寸参数的数学模型,利用粒子群优化算法优化得出最小的磁环尺寸。最后基于ATP-EMTP软件对某一1 100 kV GIS进行建模仿真,对比磁环优化前后对于VFTO幅值抑制效果。结果表明:优化前磁环和优化后磁环都能达到相同的抑制效果,GIS站内VFTO最大幅值由2.53 p.u.降低到1.47 p.u.,优化后的磁环体积减小了13.67%,可以更加经济地抑制特高压GIS中VFTO的幅值。

The disconnector switch operation in GIS will produce high amplitude VFTO, which will damage its equipment and cause system failure. In order to suppress VFTO more economically, a method based on particle swarm optimization(PSO) was proposed to suppress VFTO optimal ferrite magnetic ring size. Through the analysis of VFTO suppression effect of magnetic ring in GIS simulation, the value range of equivalent resistance and equivalent inductance of magnetic ring model is obtained. The mathematical model of magnetic ring size parameters is established and the particle swarm optimization algorithm is used to optimize and get the minimum size of magnetic ring. Finally, a certain 1 100 kV GIS was modeled and simulated based on ATP-EMTP software, and the inhibition effect on VFTO amplitude before and after magnetic ring optimization was compared. The results show that both the pre-optimized magnetic ring and the post-optimized magnetic ring can achieve the same inhibition effect. The maximum VFTO value in the GIS station is reduced from 2.53 p.u. to 1.47 p.u., and the volume of the optimized magnetic ring is reduced by 13.67%, which can more economically suppress the amplitude of VFTO in UHV GIS.