一种连续磁阀式消弧线圈及其数学模型

A Continuously Magnetic Valve Arc-Suppression Coil and Its Modeling

在现有分段饱和磁阀式可控消弧线圈的基础上提出一种新型连续磁阀式消弧线圈装置,可以避免磁阀式消弧线圈因磁阀分段饱和造成的调节"盲区",并可减少其输出电流谐波含量。该装置的磁阀由连续渐变的截面构成,在工作过程中,磁阀的不同截面随直流电流增加而相继饱和,其磁化曲线是连续可导的,避免了传统磁阀式消弧线圈可能出现的调节盲区,并且磁阀的不同截面由于饱和度不同产生相位不同的谐波电流可互相抵消,从而降低了总谐波含量。根据其结构特点,推导出磁化曲线和电流谐波特性数学模型,理论计算表明,连续磁阀式消弧线圈的调节曲线光滑,没有调节"盲区"出现。结合电磁场瞬态计算和仿真实验验证了此装置数学模型的正确性和其避免调节"盲区"及抑制谐波的有效性。

This paper proposes a novel continuously magnetic valve arc-suppression coil, which can avoid the control ‘blind area' of conventional magnetic valve arc-suppression coil and can reduce the output harmonics. The magnetic valves in this device are composed by continuous gradient cross profiles. Each section of the magnetic valve saturate in succession with the increase of DC current and therefore the ‘blind areas' of the conventional magnetic valve arc-suppression coil can be avoided. Because the saturation level of each section is different, so current harmonics can be offset with each other and then the total harmonics are reduced. Mathematical model of the magnetization curve and current harmonics distribution are deduced according to its structural characteristics. Theoretical calculations show that the control curve of the device is smooth and there is no ‘blind area'. The transient electromagnetic field calculation and the simulation results are coincident with the theoretical analysis, which demonstrate that the mathematical model is correct: there is not control 'blind area' and the current harmonics content of it is lower than conventional magnetic valve arc-suppression coil.