${H}_{\infty }$-LQR-Based Coordinated Control for Large Coal-Fired Boiler–Turbine Generation Units

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Abstract
The coordinated control system of a boiler- turbine unit plays an important role in maintaining the balance of energy supply and demand, optimizing operational efficiency, and reducing pollutant emissions of the coalfired power generation unit. The existing challenges (the fast response to wide-scaled load changes, the matching requirements between a boiler and a turbine, and cooperative operation of a large number of distributed devices) make the design of the coordinated controller for the boiler- turbine unit be a tough task. In this paper, based on a typical coal-fired power unit model, using the linear-quadratic regulator (LQR), a coordinated control scheme with H ∞ performance is proposed: the H ∞ method is used to ensure control performance on the basis of reasonable scheduling of distributed equipment; the LQR is applied to limit the control actions to meet the actuator saturation constraints. Case studies for a practical 500 MW coal-fired boiler-turbine unit model indicate that the designed control system has satisfactory performance in a wide operation range and has a very good boiler-turbine coordination capacity.
Funding Information
  • National Natural Science Foundation of China (51676068)
  • Fundamental Research Funds for the Central Universities (2016MS143, 2015ZZD15)

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