Ensuring efficient power system operation in partial phase modes

The article proposes a method for assessing the static stability of a power system in incomplete-phase modes. An analysis of permissible power system modes in the event of incomplete-phase operating modes is performed. A general approach to solving the problem of finding reserves of static aperiodic stability is formulated, with the help of which generalized equations of limit modes are obtained. The influence of a controlled shunt reactor on the throughput of intersystem power transmission lines is considered. A method for determining the limits of aperiodic static stability is developed, taking into account the asymmetry caused by the incomplete phase mode of operation. Experimental studies have been conducted that have shown the effectiveness of applying the developed method for finding limit states in the direction of weighting to solve practical problems of estimating reserves of static aperiodic stability. The work comprehensively considers the problem of asymmetric modes in main electric networks using the example of a positional model of the electric power system. Special attention is paid to introducing into the region of permissible modes according to the criterion of static stability according to the criteria of the power transmission node and, accordingly, the transmitted power along the power transmission lines. To introduce into the region of permissible modes, controlled shunt reactors are used with the corresponding developed voltage regulation law, which ensures that the maximum permissible voltage values along the line route and in the nodes of the positional model are not exceeded. The work also evaluates the influence of the incomplete phase mode on the voltage values in the nodes under conditions of different numbers of phases of shunt reactor groups.