Development and Research of a Combined Adaptive-Robust System for Controlling Steam Pressure in a Common Steam Main of the CHP Plant

The article proposes a solution for developing a steam pressure control system in the common steam main of the Blagoveshchensk Thermal Power Plant with automatic selection of parameters based on a genetic algorithm. A possible steam output of a boiler control option at a power plant is described. It involves the interconnected operation of five key components: the main controller — the upper-level control system; the heat load controller, mill loading controllers, primary air and air mixture controllers — the subordinate control loops. The main controller operates under conditions of significant uncertainty and impacts the performance of the entire heat and power generation system. The mathematical model of the control plant was obtained using a passive experiment based on an annual data on the operation of the BKZ(E)-420-140 boiler. The control plant can be represented by a system with a constant delay, changing parameters and structure in various operating modes, with a relative degree of the transfer function greater than or equal to unity. In this article we implement a procedure for the complete synthesis of the control system using: two equivalent filter-correctors — a setting and an output one, an implicit reference model, an adaptive-robust control algorithm synthesized based on hyperstability criterion (at the structural synthesis stage), and a genetic algorithm (at the parametric synthesis stage). At simulation the performance of two control algorithms was compared: the developed adaptive-robust control algorithm and the classical proportional-integral control algorithm.The results obtained in this article can be used to ensure the efficiency of large thermal power systems.

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