摘要
为降低大容量输电系统的短路电流水平,提出一种基于饱和电抗器的串联谐振式故障限流器。通过仿真,分析了暂态限流特性,并与基于ZnO避雷器的串联谐振式限流器进行比较。获取饱和电抗器式限流器的较好工作特性需要铁芯磁滞回线、电容器与串联电抗器参数之间的优化配合,关键是降低电容器的过电压。而ZnO避雷器式限流器易于限制电容器的过电压,但短路电流水平限制较低时,会导致串联电抗器上较高的过电压,因此一般不应选取过大的串联电抗器值。由于技术经济性好、结构简单、可靠性高等优点,这两种故障限流器可望在电网中较早获得应用。
With a view to reducing the short circuit current level of large capacity transmission systems, an in-series resonant type FCI. based on saturated inductor is presented. Its transient current-limiting performance is analysed by computer simulations and compared with that of an in-series resonant type FCL based on ZnO surge arrester. In order to achieve an ideal operating characteristics of the saturated inductorbased FCL, the hysteresis curve of the core, the parameters of the capacitor and the inductor in series need to be optimally coordinated, with the key lying in suppression of the over-voltage on the capacitor. It is easy to suppress the over-voltage on the capacitor by the ZnO surge arrester-based FCL, but a high over-voltage on the inductor in series will occur simultaneously while the short circuit current is suppressed to a low level. As a result,the value of the inductor in series should generally not be too large. Due to the obvious benefits of preferable technological economy, simple topology and high reliability of these two types FCL, they are expected to be applied in power grids.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2005年第4期71-75,共5页
Proceedings of the CSU-EPSA
关键词
故障限流器
饱和电抗器
氧化锌避雷器
串联谐振
fault current limiter （FCL）
saturated inductor
ZnO surge arrester
in-series resonance
