【摘要】 针对实际系统暂态稳定评估中遇到的“孤立稳定域”现象,用经典单机无穷大母线(OMIB)系统进行了详细的稳定分析。分别采用等面积法则、势能界面(PEBS)直接法和稳定域分析法研究这一现象的原因。在不考虑系统阻尼的情况下,这一现象具有周期性。极限切除时间指标在这种情形下会失灵。文中推导并给出了自治OMIB系统多摆切除,下一摆失稳的极限切除角计算公式。更多还原

【Abstract】 The phenomena of isolated stability domain (ISD) found in transient stability assessment of a real power system are analyzed with the classical one-machine infinite-bus (OMIB) system. The mechanism of this phenomenon in OMIB is studied with equal area criterion (EAC), PEBS direct method and stability region analysis, respectively This phenomenon takes on periodicity when the damping of the generator is ignored and the index of critical clearing time (CCT) is invalidated in this case The analytical expression for critical clearing angle of multiple swing clearing and unstable next swing is derived更多还原