Coordinated control method for ultra-supercritical thermal power units based on sliding mode predictive control

An ultra-supercritical unit and ultra-supercritical technology, applied in the control/regulation system, adaptive control, general control system, etc., can solve the problem of non-linear characteristics that cannot reflect the full working conditions of ultra-supercritical units, and the control performance is vulnerable to external factors. Disturbance effects, frequent fluctuations in main steam pressure and intermediate temperature
CN108227488BActive Publication Date: 2020-02-04SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI JIAOTONG UNIV
Publication Date
2020-02-04

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Abstract

The invention provides a coordinated control method of an ultra-supercritical thermal power unit based on sliding mode predictive control. The coordinated control method comprises the following steps:step one, establishing a boiler-turbine system nonlinear control model of the ultra super-critical unit and identifying model parameters in a receding manner according to historical running data of aunit distributed control system; step two, decoupling and linearizing the boiler-turbine system by adopting an input-output feedback linearization method; step three, by aiming at a quasi-linear model, constructing a predictive model of sliding mode functions and designing a discrete sliding mode control law; step four, considering the constraint conditions of the boiler-turbine system, establishing the receding horizon optimization problem and designing a dual-mode control law; step five, determining controller parameters to ensure the stability and dynamic performance of a closed-loop control system of a boiler-turbine. The coordinated control method of the ultra-supercritical thermal power unit based on the sliding mode predictive control, provided by the invention, has the advantagesthat the fast tracking performance and robustness of a unit coordination control system can be improved, and technical support is provided for the safe and economic operation of the thermal power unit.
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Description

technical field

[0001] The invention relates to a coordinated control method for ultra-supercritical thermal power units, in particular to a coordinated control method for units based on input-output feedback linearization, discrete sliding mode control and predictive control, and belongs to the technical field of thermal power control and optimization. Background technique

[0002] Due to the advantages of high energy utilization efficiency and relatively low pollutant emission, ultra-supercritical coal-fired units have been valued by the power industry. In order to make full use of renewable energy, more and more ultra-supercritical units need to participate in grid peak regulation at the same time. Through technological progress, improving the quality of coordinated control can not only improve the load following performance and meet the peak shaving requirements, but also improve the economy and safety of unit operation, thereby prolonging the life of equipment and reduc...

Claims

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