Modification of supplied demand algorithm for generation adequacy indices calculations

In order to determine the indicators of the adequacy of meshed united electric power systems (EPSs), an algorithm of accelerated calculations is proposed, which is based on probabilistic equivalenting of intersystem power flows at the conditions of probabilistic demand and supply from adjacent EPSs. The conditions are considered and the fluctuant character is pointed out of the convergence of the iteration process of the formation of the resulting indicators of the nodal power imbalances. The recurrent relation is reflected algorithmically. In order to improve the convergence of the iteration process, a modification of the guaranteed demand algorithm is proposed, which takes into account the fluctuation character of the convergence by means of parabolic interpolation of the mathematical expectation of the power flow. The calculation procedure is illustrated on the basis of a three-node closed circuit of a united EPS. The algorithm has been appraised on the basis of a 42-node circuit of a meshed EPS. Ways for further refinement of the algorithm are proposed.