发电机组失磁异步运行

THEORETICAL AND EXPERIMENTAL INVESTIGATIONS ON ASYNCHRONUS OPERATION OF GENERATOR SETS WITH LOSS OF EXCITATION

考虑发电机组机电量间的耦合 ,建立了同步发电机 Park方程与机械扭振方程相结合的暂态非线性方程组 ;采用鞍结点分叉解释了机组欠激磁失稳异步运行的机理 ,并应用中心流形理论分析了鞍结分叉点附近的动力学特性 ;数值仿真分析了失磁异步运行时机组轴系的扭振和功率角的振荡等机电量的变化规律 ;最后利用实验室发电机组进行了实验研究 ,与理论分析结果吻合良好 .

Taking into account of the nonlinearity of the shaft and the interaction of mechanism and electric in the generator sets,we get a transient model by combining the Park equations and mechanics equations.Then the saddle node bifurcation is used to explain the mechanism of asychronus operation of generator sets caused by loss of excitation.The dynamics character around the saddle node point can be investigated by the manifold theory.The variation of torsion angle,power angle and other variables are analyzed by computer simulation.Finally,we do experiment with generator set in our lab,and the experimental results show high agreement with the theoretical conclusions.