励磁调节器对模态非线性相关作用的影响

在非线性向量场2阶解析解的基础上,提出了利用数值方法求解系统参数对非线性相关作用指标敏感度的算法,通过分析控制模式与低频振荡模式之间以及控制模式与状态变量之间的非线性相关作用,可在大干扰下识别出了对系统稳定性影响较大的励磁调节器.研究了励磁调节器参数的改变对模式间的非线性相关性以及系统的动态特性和稳定性的影响.算例结果验证了本文方法和观点的正确性.

STUDY ON EFFECT OF EXCITATION REGULATOR ON NONLINEAR MODAL INTERACTION

On the basis of the explicit second order solutions of the nonlinear vector fields, an algorithm to figure out the sensitivity of nonlinear modal interaction index with respect to the system parameters is presented by use of numerical differentiation. By means of analyzing the nonlinear interaction between control mode and low frequency oscillation mode and that between control mode and state variables, the excitation regulator which remarkably effects the system stability under large disturbances is recognized, and the effects of changing the parameters of excitation regulator on nonlinear correlativity amid the modes and that on dynamic characteristics and stability of power system are researched. The correctness of the presented method and viewpoint is verified by case results.