Multivariable limited generalized prediction control method of gas turbine load regulation performance

The invention discloses a multivariable limited generalized prediction control method of a gas turbine load regulation performance. The multivariable limited generalized prediction control method of the gas turbine load regulation performance includes that (1) a controlled object model is established; (2) a prediction time domain length, a controlling time domain length, sampling time, an error weight matrix and a controlling weighting matrix are determined; (3) a transfer function model of a controlled object is discretized to form a controlled auto-regressive integrated moving average (CARIMA) model; (4) according to constraints of opening degrees of a fuel valve of a gas turbine and a steam turbine entrance regulating valve at current moment, actual opening degrees of the fuel valve and the steam turbine entrance regulating valve can be obtained; (5) actual power of a combined cycle unit and changes of steam turbine main steam pressure are controlled. According to the multivariable limited generalized prediction control method of the gas turbine load regulation performance, a generalized prediction control algorithm strategy is introduced into a gas-steam combined cycle unit load control system, unit actual power can rapidly trace AGC instructions, a novel designed assessment criterion requirement can be met, meanwhile, the fluctuation range of the steam turbine main steam pressure can slow down, heat supply steam qualities can be improved, and the application prospect is good.