Increasing the Stability of a Plant when Supplying Power to a Variable Load

A special feature of industrial power plants is their operation at variable loads, both in normal and island mode. A specific load may have a power commensurate with the power of synchronous generators and be connected at different electrical distances, including on the generator voltage buses. On the other hand, industrial distributed generation facilities are very diverse both in power and the type of prime mover. The purpose of this work is to develop a set of measures to ensure the sustainability of such power sources. To do this, based on the analysis of the static and resulting stability of synchronous generators of factory power plants in normal mode and island output, the possibilities of increasing the static and resulting stability were identified. First of all, these include the improvement of excitation and speed control systems for power supplies. In the presence of a variable load, it is necessary to determine the permissible ratio between the installed power of the generators and the value of the variable load, taking into account the inertia of the sources. An algorithm has been developed that makes it possible to assess the admissibility of operation of a given unit with a sharply variable load in various operating modes. A software package has been obtained for calculating transient electromechanical processes of synchronous generators operating on a variable load, in normal mode and in separate operation. A computational experiment was carried out showing the influence of the inertia of generator rotors on the swing of machines.