Preisach模型剩磁计算与抑制励磁涌流合闸角控制规律  

Calculation of Residual Flux Based on Preisach Model and Entering Phase Control of Transformer To Eliminate Inrush Current

作　　者：李钷[1] 乌云高娃[1] 刘涤尘[1] 叶念国[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电力系统自动化》2006年第19期37-41,共5页Automation of Electric Power Systems

摘　　要：变压器在因电力故障继电保护动作或因运行方式改变等原因而退出运行后再次投运时铁心剩磁并不是随机的。在分析磁性材料的时效特性的基础上,结合Preisach模型及其特性,推导出了分段计算铁心剩磁的方法。在此基础上,对单相变压器抑制励磁涌流的控制合闸角策略进行分析,推导出合闸角控制律,EMTP实验验证了该策略的正确性。同时,仿真实验揭示了在给定电流超调裕度下不同剩磁环境所对应的合闸角波动范围的变化规律;最后,遵循该规律,提供了设计单相变压器抑制励磁涌流装置的分段合闸角策略。When a transformer is switched back into power system operation again without load from last switching off, due to either the action of protective device aiming at the system fault or the changes of system framework structure, the residual flux of ferromagnetic core is non-random. Based on the time-characteristic of ferromagnetic material analysis, combined with Preisach model, a way to calculate residual flux is proposed. An expression between the residual flux and the entering phase is derived to eliminate inrush current in single-phase transformer and its correctness is shown by an EMTP test. Meanwhile, some rules between the residual flux and the range of entering-phase at a given overshoot limit of inrush current are demonstrated in the simulations. Finally, these rules have been used to propose a control strategy about entering-phase in sections to design a device to eliminate the inrush current.

关 键 词：PREISACH模型 剩磁计算 励磁涌流 合闸角控制 

分 类 号：TM406[电气工程—电器]