同步发电机非线性电阻灭磁仿真研究

同步发电机通常采用非线性电阻灭磁方式,建立了非线性电阻(包括碳化硅和氧化锌)灭磁的Matlab仿真模型.其中考虑了空载特性的非线性和转子阻尼绕组的效应.通过对某水电站的667 MW水轮发电机进行灭磁仿真,最终得出了磁场电流、电压、d轴阻尼绕组电流的变化情况,以及非线性电阻等各部分吸收的磁能和灭磁时间,从而更真实直观地展示了非线性电阻灭磁过程.

Simulations of Non-Linear Resistance De-Excitation of Synchronous Generators

De-excitation with non-linear resistance is usually adopted in large synchronous generators. This paper describes the Matlab Mathematical simulation models of the de-excitation with non-linear resistance with consideration given to the nonlinearity of no-load characteristic of generator and the induction effect of rotor damper winding. The de-excitation simulation of a 667 MW hydro-turbine generator in the Pubugou Hydropower Station is conducted with curves of the field current and voltage and the damping winding current on the d-axis obtained. At the same time, the magnetic energy absorbed by de-excitation resistor, field winding and damping winding on d-axis, the de-excitation time are also obtained, so a true and visual observation of the de-excitation process is provided.