Increasing the Static Stability of Synchronous Generators with Group Excitation Control

A feature of industrial power plants is a significant change in their parameters under different loads, both in normal and emergency operation. Individual energy-intensive consumers can have a power commensurate with the power of synchronous generators and be connected at different electrical distances, including on the generator voltage buses. The purpose of these studies is to develop a set of measures to ensure the static stability of synchronous generators with group excitation control. To do this, based on an analysis of the operational parameters of normal and emergency modes of factory power plants, opportunities for increasing static stability were identified. First of all, this is the improvement of excitation and speed control systems for power supplies. This work is based on the principle of group excitation control to maintain the same value of rotor angles. An algorithm has been developed that makes it possible to estimate the static stability margin of synchronous machines in various operating modes during group regulation and parallel operation with the power system. It is also possible to change their parameters with specified restrictions. A software package has been obtained for calculating transient electromechanical processes of synchronous generators operating at a generalized load in normal and emergency modes. A computational experiment was carried out showing the influence of different loads of power plant turbogenerators on stability.