摘要
对水轮发电机空载误强励时磁场灭磁进行了仿真计算。针对用线性电阻、非线性电阻(包括氧化锌和碳化硅)灭磁,建立了不同的数学模型,并考虑了发电机空载特性的非线性,将空载特性用分析表达式近似表示,最后利用了MATLAB的Simulink工具。通过对三峡700MW水轮发电机的实例仿真,得出了灭磁过程中励磁电压、励磁电流的变化曲线,以及非线性电阻在灭磁过程中吸收的磁场能量和灭磁时间,并对比了在相同灭磁反压下用线性灭磁电阻的灭磁效果,为在已知发电机有关参数下设计和选取非线性灭磁电阻提供了依据。
The paper describes the simulation of de-excitation of no-load water wheel generators during mal-forced excitation. Various mathematical models for de-excitation with linear resistors and non-linear resistors, such as ZnC) and SiC, arc established In addition, the no-load characteristics of generators are expressed approximately by an analytic expression for facilitating the simulation. Finally, a simulation example of de-excitation for a water wheel generator of the Three Gorges Hydropower Plant with MATLAB-Simulink is given. The curves of the excitation voltage and current during de-excitation, and the absorbed energy of magnetic field and de-excitation time of non-linear resistors during de-excitation, are obtained. The de-excitation effect of linear resistors is compared for the same de-excitation in verse-voltage, providing a basis for the design and selection of non-linear resistors with known parameters of the generator.
出处
《水电自动化与大坝监测》
2005年第3期40-44,共5页
HYDROPOWER AUTOMATION AND DAM MONITORING
关键词
水轮发电机
非线性电阻
灭磁
MATLAB仿真
water wheel generator
non-linear resistor
de-excitation
simulation with MATLAB
