Decentralized nonlinear control method and system based on cfb nonlinear model
A nonlinear model, nonlinear control technology, applied in general control systems, control/regulation systems, adaptive control, etc., can solve the problems of poor control effect of circulating fluidized bed boilers
Active Publication Date: 2016-06-29
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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[0004] Based on this, it is necessary to provide a decentralized nonlinear model based on CFB nonlinear model with better control effect to solve the problem that the nonlinear phenomenon is serious in the control process of circulating fluidized bed boilers, which makes the control effect of circulating fluidized bed boilers poor. Linear control method and system
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[0017] Such as figure 1 As shown, a decentralized nonlinear control method based on CFB nonlinear model, including steps:
[0018] Step S110, obtaining the parameters of the nonlinear mapping relationship of the pre-established circulating fluidized bed unit nonlinear model, inverting the control parameters, and transforming the circulating fluidized bed unit nonlinear model into a circulating fluidized bed unit linear Model;
[0019] Step S120, controlling the linear model of the circulating fluidized bed unit to output the main steam pressure of the equipment to be controlled by controlling the total amount of fuel, and controlling the linear model of the circulating fluidized bed unit to output the generator output of the equipment to be controlled by controlling the valve opening power.
[0020] In this embodiment, the parameters of the nonlinear mapping relationship of the nonlinear model of the circulating fluidized bed unit may be the parameters of the nonlinear mappi...
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A decentralized nonlinear control method and system based on a CFB nonlinear model, obtains parameters of a nonlinear mapping relationship of a nonlinear model of a circulating fluidized bed unit, inverts the control parameters, and converts the circulating fluidized bed The nonlinear model of the bed unit is transformed into a linear model of the circulating fluidized bed unit; the linear model of the circulating fluidized bed unit is controlled by controlling the total amount of fuel to output the main steam pressure of the equipment to be controlled, and the circulating fluidized bed unit is controlled by controlling the valve opening. The linear model of the bed unit outputs the generator output power of the equipment to be controlled. By inverting the control parameters to achieve the effect of linearization, the control is simpler and the control performance is better. The total amount of fuel is used to control the main steam pressure and the valve opening to control the output power of the generator. Control them separately, making the control effect better.
Description
technical field [0001] The invention relates to the technical field of generating set control, in particular to a decentralized nonlinear control method and system based on a CFB nonlinear model. Background technique [0002] CFB (Circulating Fluidized Bed, Circulating Fluidized Bed Boiler) is one of the clean coal power generation technologies. Because of its good fuel adaptability, it has shown great advantages and has long-term development significance in the Chinese market where thermal power generation dominates. The circulating fluidized bed system is a thermal system with multiple inputs and multiple outputs, and has the characteristics of thermal control objects such as nonlinearity, large inertia, and strong interference. It is very different, and the technology of circulating fluidized bed boilers at home and abroad is still immature compared with pulverized coal boilers, and the operation methods and control methods need to be studied. Therefore, it is of great s...
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IPC IPC(8): G05B13/04
Inventor 廖宏楷罗嘉陈华忠史玲玲郑闻成
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID