基于场路耦合的磁阀式可控电抗器损耗特性分析  

Loss Characteristics of Magnetic Control Reactor Based on Field-circuit Coupling Method

作　　者：吴敏辉 WU Minhui(State Grid Fujian Electric Power Co., Ltd., Fuzhou 350003, China)

机构地区：[1]国网福建省电力有限公司

出　　处：《电力电容器与无功补偿》2019年第3期64-69,78,共7页Power Capacitor & Reactive Power Compensation

摘　　要：磁阀式可控电抗器(MCR)因磁阀处铁芯截面积减小而导致局部磁密增大,加之 MCR 铁芯常工作于饱和状态,因此其损耗较常规的变压器、电抗器大得多。这些损耗引起局部温升过高,影响 MCR 的正常运行甚至造成过热损坏。不同的磁阀结构对 MCR 的漏磁、损耗的影响难以通过其等效模型反映,需要采用场路耦合的方法建立电-磁-热多物理场模型进行分析。本文针对集中式、两侧分布式和均匀分布式 3 种不同磁阀结构的 MCR 在有限元仿真软件中建立模型研究其损耗特性。此外,考虑到均匀分布式磁阀在实际加工中往往由硅钢片与磁阻材料堆叠而成,对不理想的工艺条件导致的磁阀的不规则分布及其损耗特性进行了分析。仿真结果表明,理想情况下均匀分布式磁阀结构的 MCR 漏磁最小,损耗最低;不规则分布磁阀会引起局部损耗过高。最后,分析了均匀分布式磁阀结构 MCR 的温度场分布,为其实际运维中的温度检测提供理论指导。Due to smaller cross-section area at the locatin of controlling magnetic valve, magnetic control reactor (MCR) has excessive local magnetic density. Because the core of MCR often works in saturation state, its loss is much larger than that of conventional transformer and reactor. These losses ensure local temperature raise to affect the normal operation of MCR and even incur overheating damage. The currently available equivalent model fails to reflect the effect of different magnetic valve structures on the leakage and loss of MCR. It is desirable to establish an electro-magnetic-thermal multi-physical field model for more proficient analysis by field-circuit coupling method. In this paper, the loss characteristics of MCR with centralized, bilaterally distributed and uniformly distributed magnetic valves are studied by finite element method. In view of that the uniformly distributed magnetic valves are often stacked with silicon steel sheets and magnetic resistance material in practical process, the loss characteristics of irregular distribution magnetic valves caused by unsatisfactory process conditions are also expored. The simulation results show that under ideal conditions, the MCR with uniformly distributed magnetic valve structure has the smallest leakage and the lowest loss, and the irregular distributed magnetic valve will cause excessive local loss. Accordingly, the temperature field of MCR with uniformly distributed magnetic valve structure is further analyzed to provide theoretical guidance for temperature detection in practical operation and maintenance.

关 键 词：分布式磁阀 损耗 场路耦合 

分 类 号：TM47[电气工程—电器]