摘要
变压器的空载合闸过程容易引起较大的励磁涌流,进而影响甚至危害变压器和电力系统的正常运行。对变压器励磁涌流的机理进行深入研究及仿真,对于保证电力系统运行安全以及变压器的继电保护定值的设置具有十分重要意义。在考虑变压器的磁饱和及磁滞特性基础上,利用计及变压器铁心磁滞特性的非线性数学模型,对三相变压器励磁涌流形成的机理及影响因素进行了分析,并采用了并联的非线性补偿电流源来模拟变压器的非线性特性。最后,对三相变压器在不同合闸时间点的励磁涌流及谐波特性进行了仿真,结果表明文中所采用的方法是正确可行的。
The switching process of electrical transformer with no-load may result in magnetizing inrush current with high amplitude. Such currents have many unfavorable effects on electrical power system and electrical transformer. It is quite urgent to research on pricinple of magnetic inrush current for the safety of power system and the setup of relay protection operation, as well as to simulate the phenomena exactly. Considering the magnetic hysteresis characteristics and magnetic saturation of electrical transformer, the principle of magnetic inrush current is analyzed for three-phase transformers based on a nonlinear mathematical model with magnetic hysteresis and saturation characteristics. In the simulation, a parallel nonlinear compensating current source is proposed to simulate the nonlinear characteristics of electrical transformer. In the end, the magnetic inrush currents and harmonics currents of three-phase electrical transformer are given at different switching time, and the results have proven the nonlinear current can compensate the nonlinear of electrical transfomaer, such as magnetic hysteresis characteristics and magnetic saturation.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2008年第15期27-32,共6页
Power System Protection and Control
关键词
励磁涌流
磁滞特性
磁饱和特性
空载合闸
非线性补偿电流源
magnetic inrush current
magnetic hysteresis characteristics
magnetic saturation
switching with no-load
nonlinear compensating current source
