异步发电机自激建压临界值的计算

An Approach to Calculate Critical Values of Self-Excited Voltage Build-up for Induction Generators

以自激异步发电机αβ轴等值电路为基础,结合系统稳定性理论说明了异步发电机自激建压的条件。对系统的特征值进行分类,定义特征值实部函数,并对不同自激电容和转速下的函数值进行计算。以特征值实部函数绝对值作为目标函数,采用一维搜索优化方法对样机的建压临界电容和临界转速进行计算。新方法与传统方法计算结果一致,验证了新方法的正确性。

Taking the equivalent circuit of a self-excited induction generator in α-β coordinate system as the foundation and combining with system stability theory, the conditions of voltage build-up for self-excited induction generator are illustrated. Classifying the eigenvalues of the system, the eigenvalue real part functions are defined and the fimction values under different self-excited capacitances and rotating speeds are calculated. Taking the absolute value of eigenvalue real part function as objective function, the critical capacitances and rotating speeds for voltage build-up of the test induction generator are computed by one-dimensional optimization method. The calculation results by the proposed approach are the same as those by the traditional calculation method, so the correctness of the proposed approach is verified.