Adaptive control of the rotational frequency of a gas-turbine unit using a tunable model

Abstract

In this paper, methods of adaptive control of gas-turbine units that are parts of gas-turbine power plants are studied. The main qualitative and quantitative indicators of the operation of these units depend on the automatic control system. In the autonomous operation of a gas-turbine power plant, the frequency of electricity directly depends on the rotational speed of the turbine of a gas-turbine plant connected through a reducer to a synchronous generator shaft. Modern adaptive control systems are often developed on the basis of aeronautical automatic control systems and do not take into account the features of load changes in the production of electricity. This leads to the fact that the power-quality indicators for frequency, such as maximum deviation and recovery time, do not always meet the requirements of GOST (State Standard). The aim of this study is to improve the quality of electricity by frequency in the autonomous mode of operation of a gas-turbine power plant. Methods of signal adaptive control with reference and tunable models are considered. The structures of the reference and tunable models and the method of identification in real time are presented. The position of the adaptation module in the overall structure of the automatic control system of the gas-turbine unit has been determined. Results of mathematical modeling confirming the effectiveness of the method are presented.