Об анализе пределов по апериодической устойчивости электроэнергетических систем

Abstract

The article considers the possibility of finding a correspondence between the electric power system (EPS) aperiodic steady-state stability limit and the reaching of an extreme value of some physical variable(s). It is shown that for EPSs satisfying the conditions under which the Jacobian of the steady-state equation system has the sign coinciding with the sign of the EPS characteristic equation’s absolute term, the aperiodic steady-state stability limit corresponds to the extreme value of the variable in which the operating mode is aggravated (and, consequently, to the extreme values of the active power outputs of the generators being loaded/unloaded and consumed loads in the operating mode aggravation scenario). It is also shown that in the general case one cannot judge about reaching the EPS aperiodic steady-state stability limit based on reaching an extreme value of power transmitted through one of the aggravated power system cut sets.