Methodology for Creating Mathematical Models of Thermal Power Plants for Conducting Optimization Studies of Operating Modes of the Electric Power System

The authors present a methodology for creating mathematical models of thermal power plants for the problems of optimizing the operating modes of an electric power system. The thermal power plant models allow simulating thermal power plants for studying large electric power systems in a short time. The mathematical model of a thermal power plant is based on models of turbines and boiler units. The turbine and boiler unit models use coefficients of specific electricity generation based on thermal consumption and specific heat consumption for electricity generation for each type of the main generating equipment. The equipment models take into account a nonlinear decrease in the internal relative efficiency of the turbine with a decrease in heat consumption at the turbine inlet in relation to the nominal flow rate and the efficiency of boiler units with a decrease in their thermal load in relation to the nominal. The use of models of this type makes it possible to optimize the main composition of operating turbines and boiler units with changes in electrical and thermal loads. The proposed methodology is also applicable to constructing dependencies of hourly fuel consumption on electrical and thermal loads and to determining the annual fuel consumption of a thermal power plant based on calculations of its operation in average winter and average summer modes. An example of calculating the operating modes of a thermal power plant is given in this article. The authors used the method of stepped optimization developed at ESI SB RAS when conducting optimization studies of the operating modes of thermal power plants.