Boiler drum water level self-adaptation PID (proportion integration differentiation) control method

A control method and boiler drum technology, which is applied in the direction of controlling feed water, steam generation, preheating, etc., can solve the problems of errors, inability to smoothly output the expected control amount, difficulty in setting the drum water level control, etc., and improve the control quality Effect

Inactive Publication Date: 2013-03-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Although fuzzy control has many advantages, it is difficult to set when it is applied to the control of drum water level, there are errors, and it is impossible to smoothly output the desired control amount in the case of frequent fluctuations

Method used

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  • Boiler drum water level self-adaptation PID (proportion integration differentiation) control method
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  • Boiler drum water level self-adaptation PID (proportion integration differentiation) control method

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Embodiment Construction

[0039] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0040] figure 1 It is a schematic diagram of boiler drum water level adaptive PID control in a boiler drum water level adaptive PID control method provided by the present invention. figure 1 Among them, the three parameter values ​​of the conventional PID controller are adaptively adjusted according to the deviation signal e of the steam flow rate D, the feedwater flow rate W and the steam drum water level H, and the deviation change rate ec. When the control system is disturbed, it can act quickly and realize the steam drum Stable control of water level. The self-adaptive link is realized by a two-dimensional cloud model controller. The deviation signal e obtained by sensor sampling is used to calculate the variatio...

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Abstract

The invention discloses a boiler drum water level self-adaptation PID (proportion integration differentiation) control method in the technical field of electric control. According to the technical scheme, the method comprises the steps of: establishing a two-dimensional dual-input three-output cloud model controller; collecting and controlling system deviation variable quantity e, and calculating the deviation variable rate ec; establishing PID controller setting values delta P, delta I and delta D; substituting the system deviation variable quantity e and the deviation variable rate ec into the two-dimensional dual-input three-output cloud model controller; outputting the setting values delta P, delta I and delta D through seasoning; carrying out linear calculation with a conventional PID controller again, wherein the PID controller which generates novel parameters after setting determines the system output quantity. The boiler drum water level self-adaptation PID control method provided by the invention improves the stability of a boiler drum water level control system, accelerates the system response speed, and intensifies the anti-interference capability on disturbing signals.

Description

technical field [0001] The invention belongs to the technical field of electric power control, and in particular relates to a boiler steam drum water level adaptive PID control method. Background technique [0002] The steam drum is a device for steam-water separation. There is a large amount of steam-water mixture in the steam drum. The steam drum water level system is a nonlinear system with a large lag. The task of automatic control of steam drum boiler feed water is to adapt the boiler feed water to the boiler evaporation, so as to maintain the steam drum water level within the specified range and maintain a stable feed water flow. If the water level of the steam drum is too high, it will affect the normal operation of the steam-water separation device in the steam drum, resulting in excessive moisture in the outlet steam, which will cause scaling on the superheater tube wall, easily burn out the superheater, and also cause a sharp change in the temperature of the superh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D5/26
Inventor 韩晓娟孔令达程成王笑宇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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