PRACTICAL MINIMUM LOAD SHEDDING STRATEGY TO MITIGATE VOLTAGE COLLAPSE

This paper presents a new approach for determining the minimum load sh edding to restore the solvability of a power system described by diffe rential-algebraic equations. Through parameterization of a given contr ol strategy (i.e. control direction in parameter space), the continuat ion method is applied to find the equilibrium point associated with th e system post-contingency boundary. Then, the invariant subspace param etric sensitivity (ISPS) is used to determine the most effective contr ol strategy so that a practical minimum load shedding can be derived. The system adjustments that could further reduce the minimum load shed ding, such as rescheduling of real power generations and changing of g enerator terminal voltages are also investigated The approach is illus trated with the New-England 39-bus system and the reduced Iowa 162-bus system.