开关特性饱和电抗器原理及其实验

Principle and testing of a saturable reactor with switch characteristic

提出一种开关特性饱和电抗器,它是变压器参数与饱和电抗器性能结合的产物。提出的开关特性饱和电抗器可作为一种交流电路无源开关使用,工作原理简单、可靠,可通过控制电压等级很低的电力电子器件,控制很高电压等级电力系统交流输电回路的开关状态。阐述了这种开关特性饱和电抗器的基本工作原理与基本结构。开关特性饱和电抗器非线性暂态过程的理论分析十分困难;设计制造了220V的实验样机,采用大量实验的方法总结开关特性饱和电抗器变化规律。实验表明,提出的开关特性饱和电抗器原理可行;暂态过程与电流大小有关;在截止过程中,开关特性饱和电抗器具有电流越大暂态过程越短的特性;该特性有利于实现短路电流限制器功能。

This paper presents a saturable reactor with switch characteristic, which combines transformer parameters with reactor performances. The proposed reactor is an AC circuit passive switch, whose configuration is simple and reliable. It makes it possible to control high voltage AC transmission line＇s switching state through control of low voltage power electronic equipment. The operation principles and configuration of the saturable reactor are described. It is very complex to establish analytical mathematical model of nonlinear transient characteristics. A 220 V prototype is developed, which is successfully tested in the laboratory. The experiment results show that the operation principles and configuration of the saturable reactor are valid, and the transient process is influenced by the value of the current. During the cut-off process, the larger the current becomes, the shorter the transient duration of saturable reactor with switch characteristic becomes. This characteristic is in favor of realizing the performance of the fault current limiter.