磁集成技术在变压器式可控电抗器中的应用

Application of Magnetic Integration Technology to Controllable Reactor of Transformer Type

由于变压器式可控电抗器(controllable reactor of transformer type,CRT)控制绕组间存在磁耦合,笔者将解耦磁集成技术应用于CRT的结构设计中,通过向各控制绕组的磁通提供低磁阻磁路来实现控制绕组间的解耦,从而提出了一种磁集成CRT铁心结构,进一步计算了各绕组的漏感,建立了其电感—变压器等效电路,推导了各控制绕组间的耦合度以及空载电流与侧柱气隙大小之间的关系式,并在MATLAB平台下对其进行了仿真分析。仿真结果表明增大气隙,可以减小控制绕组间的磁耦合,提高绕组容量利用率;验证了此结构通过控制侧柱气隙的大小达到解耦的方法是有效的。

Since the magnetic coupling exists between control windings of controllable reactor of transformer type（CRT）,the authors applied the decoupling magnetic integration technology to CRT structure design. The magnetic circuit with low magnetic resistance is provided to the magnetic flux of each control windings to realize decoupling between the control windings. Thereby, a magnetic integration structure of CRT core is proposed. The leakage inductance of each winding of this structure is calculated,its inductance-transformer equivalent circuit is established,and equation of coupling degree of control windings and no-load current with size of lateral column air gap are deduced,simulation analysis is carried out on MATLAB platform, and the results show that increase in the air gap can decrease the magnetic coupling between control windings and raise the utilization ratio of winding capacity,which verifies the effectiveness of the proposed magnetic integration structure of CRT core.