Retrofit design of electric control system of thermal power plants based on DCS technology

This study investigates the retrofit design of electric control system of a thermal power plant based on DCS technology. Combining adaptive technique and decoupling method for multivariable systems, a model reference adaptive decoupling control algorithm for electric control system is proposed in this paper. This algorithm not only improves the quality of decoupling but also remarkably enhances the adaptability to varying parameters. Through microcomputer control method, the adaptive decoupling control algorithm presented in this paper is successfully applied to control water level and steam pressure of parallel desecrator systems. The satisfactory control results not only show that the algorithm is effective and practical but also verify that it is a successful attempt to apply adaptive control theory to control multivariable processes in thermal power plants.