A Coordinated Control Method for Thermal Power Units Based on Hierarchical Limited Predictive Control
A technology of coordinated control and thermal power units, applied in the direction of control/regulation system, adaptive control, general control system, etc., can solve the problems of unrealized control methods, unrealizable, complicated process, etc., and achieve easy engineering practice and low calculation volume Small, algorithmically simple effects
Active Publication Date: 2022-03-04
HUANENG POWER INT INC
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However, the complex algorithm of the constrained predictive control method often makes it impossible to realize in practical engineering applications. Literature [1] proposed a constrained predictive control method based on fuzzy index function, but the calculation amount is large and the process is complicated
Secondly, safety and economic indicators are also important factors in the assessment of power plants, but they have not been realized in the current control methods
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[0043] A kind of coordinated control method of thermal power units based on hierarchical limited predictive controller of the present invention is specifically realized by the following scheme:
[0044]The layered limited predictive controller includes a target trajectory dynamic optimization layer, i.e. an upper layer, and a restricted predictive control layer, i.e. a lower layer, and the specific steps of the thermal power unit coordinated control method are as follows:
[0045] Step 1: Train the support vector machine model of the dynamic optimization layer of the target trajectory according to the historical data and the evaluation function;
[0046] Step 2: Experimentally obtain the coordination system transfer function model G(s) under the typical working conditions of the unit;
[0047] Step 3: Determine the constraint range, control step size, prediction step size and sampling time Ts of the restricted predictive control layer;
[0048] Step 4: According to the suppor...
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The present invention provides a coordinated control method for thermal power units based on layered limited predictive control. The layered limited predictive controller includes two parts: a control target trajectory dynamic optimization layer and a restricted predictive control layer. Its characteristics are Input the set value of each variable into the trajectory optimization layer to optimize the control trajectory, and the lower layer uses simplified constrained predictive control to calculate the optimal control rate according to the target trajectory of the upper layer when the error is too large. The controller designed by this method has strong adaptability and accurate control. The simplified constrained predictive controller requires fewer parameters, which is beneficial for debugging. It can overcome the characteristics of large lag and large inertia of the objects in the coordinated control of thermal power units. At the same time, the restricted predictive control can effectively consider the actual constraints such as the upper and lower limits of the actuator and the speed limit, and improve the safety of the unit coordinated system control.
Description
technical field [0001] The invention relates to the field of automatic control of thermal power units, in particular to a coordinated control method for thermal power units based on hierarchical limited predictive control. Background technique [0002] With the continuous growth of the new energy industry, wind power and solar energy have gradually changed the current grid structure. Due to the instability of new energy, how can each high-parameter unit solve the problem of frequency and peak regulation frequently and efficiently, and realize the coordinated control between machines and furnaces, and quickly Tracking the grid load response becomes the main task of each power plant. [0003] The coordinated control system of unitary units is a multivariable, strongly coupled, nonlinear time-varying system that controls boilers, steam turbines and auxiliary machines as a whole. At present, the traditional and extensive coordinated control system uses conventional PID control, ...
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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 高歆光刘福军孙涛杨庆治郭勇李绍平
Owner HUANENG POWER INT INC