可动磁柱式粗调/微调复合调感电抗器原理

电力电抗器电感值的快速可调和局部微调在电力系统运行过程中具有重要作用。为此,提出一种可实现粗调/微调复合调感的电抗器原理,通过调节两磁柱之间的平行间距使工作磁路及其磁阻发生改变进而实现电感值连续调节。结合磁路的欧姆定律推导电感值理论计算公式;建立电抗器三维磁场仿真模型,运用有限元法计算磁场分布和电感值;详细分析电感调节特性。研究结果表明:可动磁柱的位置使工作磁路发生改变,工作磁路由一条变成3条,再由3条过渡为2条;电感值与调节距离呈双指数规律变化,随着调节距离增大,电感值减小;电感调节特性曲线分为快速调感区、过渡区和微调电感区3个区域;这种电抗器可实现粗调/微调复合调感。

Coarse-tuning/fine-tuning adjustment theory of moveable magnetic-pillar reactor

Coarse-tuning and fine-tuning adjustment of the power reactor''s inductance is very important for the operation of power system. Thus, a theory is proposed that could achieve the coarse-tuning and fine-tuning adjustment of inductance by adjusting the distance between the two magnetic-pillars to change the working magnetic circuits and its reluctance so as toachieve a continuous adjustment of inductance. Combined with magnetic circuit of Ohm''s law the calculating formula of inductance could be deduced; modeling reactor''s 3D magnetic-field, magnetic flux density and inductances could be caculated by finite element method.And the feature of inductance''s adjustment curve is analysed in detail. The results show that the position of moveable magnetic-pillar could change the working magnetic circuit, and the number of working magnetic circuits changes from one to three, then from three to two; the relationship between inductance and the distance of two magnetic-pillars is a double exponential function. When the distance between the two magnetic-pillars increases, the inductance decreases; the inductance''s adjustment curve is composed of three areas:coarse-tuning area, transition area and fine-tuning area. The reactor based on this theory could achieve coarse-tuning/fine-tuning adjustment of inductance.