Decentralized nonlinear control method and system based on CFB nonlinear model
A nonlinear model and nonlinear control technology, which is applied in general control systems, control/regulation systems, adaptive control, etc., can solve problems such as poor control effect of circulating fluidized bed boilers
Active Publication Date: 2013-12-18
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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The invention discloses a decentralized nonlinear control method and system based on a CFB nonlinear model. Parameters of the nonlinear mapping relation of a circulating fluidized bed unit nonlinear model built in advance are acquired; the inverse matrix of the control parameters is calculated, and the circulating fluidized bed unit nonlinear model is converted to a circulating fluidized bed unit linear model; total fuel amount is controlled to control the circulating fluidized bed unit linear model to output the main steam pressure of equipment to be controlled, and the valve opening is controlled to control the circulating fluidized bed unit linear model to output generator output power of the equipment to be controlled. Because the inverse matrix of the control parameters is calculated to achieve linearization effect, control becomes easier, and the control performance is better; because the total fuel amount is adopted to control the main steam pressure and the valve opening to control the generator output power, the equipment to be controlled can be independently controlled, and control effect is 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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Inventor 廖宏楷罗嘉陈华忠史玲玲郑闻成
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID