应用于谐振型限流器的双分裂铁心电抗器研究

发布时间：2018-06-27 22:39

本文选题：谐振型限流器 + 双分裂电抗器　；参考：《电工技术学报》2017年03期

【摘要】：为了降低串联谐振型限流器中流过晶闸管短路电流的幅值和上升率,提高电容器旁路电路的可靠性,提出一种双柱双分裂铁心电抗器,将晶闸管串接在双分裂电抗器的一个支路,然后再与补偿电容器并联。系统正常运行时,双分裂电抗器表现为大电感,流过的电流很小;在电网线路发生短路故障时,晶闸管导通,双分裂电抗器表现为小电感,快速转移流过补偿电容器的短路电流,谐振状态破坏从而实现限流功能。设计并制作了一台应用于400 V串联谐振型限流器的双柱双分裂铁心电抗器样机,基于三维棱边有限元法对电抗器磁场分布和电感参数进行了计算。电抗器以单支路小电流模式运行时,电感为192 m H;以双支路大电流运行模式时,电感为151μH。通过短路电流冲击测试发现,双分裂电抗器可实现电流快速转移且两支路电流均匀分配,电感测试值与仿真值吻合较好。为了降低晶闸管的冲击电流,提出一种在保持单支路运行电感恒定的前提下调整双支路运行电感的方法,仿真结果证明了该方法的有效性。
[Abstract]:In order to reduce the amplitude and rise rate of short circuit current flowing through thyristor in series resonant current limiter and to improve the reliability of capacitor bypass circuit, a double column double split core reactor is proposed. The thyristor is connected in series to a branch of the double-splitting reactor and then shunt with the compensation capacitor. When the system is in normal operation, the double split reactor behaves as a large inductance, and the current passing through is very small, and when a short circuit fault occurs in the power line, the thyristor is on and the double split reactor is a small inductance. The short-circuit current of the compensation capacitor is quickly transferred and the resonant state is destroyed so that the current-limiting function is realized. A two-column double-split core reactor prototype for 400V series resonant current limiter is designed and fabricated. The magnetic field distribution and inductance parameters of the reactor are calculated based on three-dimensional edge finite element method. The inductance of the reactor is 192 MHz when the reactor is running in the single branch mode with small current, and 151 渭 H with the high current mode of the double branch circuit. Through short circuit current shock test, it is found that the double splitting reactor can realize fast current transfer and uniform distribution of current between the two branches, and the test value of inductance is in good agreement with the simulation value. In order to reduce the impulse current of thyristors, a method of adjusting the operating inductance of two branches while maintaining the constant operating inductance of a single branch is proposed. The simulation results show that the method is effective.
【作者单位】：中国科学院电工研究所;丹东欣泰电气科技有限公司;
【基金】：辽宁省科学技术计划资助项目(2013040067-201)
【分类号】：TM47

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