Fuzzy self-tuning PID control method used for denitration control system

A control system and control method technology, applied in the field of control, can solve the problems of large delay, nonlinearity, and poor control effect of the denitrification system, and achieve the effect of being intelligent and reducing the burden

Inactive Publication Date: 2017-03-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The denitrification system has the characteristics of large delay, nonlinearity, and time-varying. When the controlled object changes, the PID control cannot achieve a g

Method used

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  • Fuzzy self-tuning PID control method used for denitration control system
  • Fuzzy self-tuning PID control method used for denitration control system
  • Fuzzy self-tuning PID control method used for denitration control system

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Embodiment Construction

[0070] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The fuzzy self-tuning PID control method for the denitrification control system of the present invention comprises the following steps:

[0071] 1. Determine the fuzzy rule table of Kp, Ki, Kd;

[0072] Find out the relationship between error (e) and error rate of change (ec) and Kp, Ki, Kd,

[0073] The determination rule of proportional coefficient Kp:

[0074] When the controlled object remains unchanged, use the PID parameters to adjust the object to the best control performance. At this time, according to the transfer function of the PID, Kp can be obtained as a proportional coefficient, Ki is an integral coefficient, and Kd is a differential coefficient. In the formula, 1 / s is the integral link, and s is the differential link;

[0075] The transfer function of PID control is:

[0076]

[0077] In the initial stage of the control process, in...

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Abstract

The invention discloses a fuzzy self-tuning PID control method used for a denitration control system. The error of the output and the expected value of a controlled object and the change rate of the error are returned under the operation state of a coal-fired unit SCR denitration system, the parameters of the PID are adjusted online according to the fuzzy inference principle and the controlled object can be adjusted to the original state when the controlled object changes. The advantages of the fuzzy self-tuning PID control method used for the denitration control system are that the fuzzy self-tuning PID method does not need to know the exact mathematical model so that the difficulty in modeling can be avoided, the PID parameters can be adaptively modified in real time to be adaptive to the change of the condition and thus the method is intelligent, reduces the burden of operation personnel and the result is better than that of the conventional control.

Description

technical field [0001] The invention relates to a fuzzy self-tuning PID control method for a denitrification control system, relates to an online control method for NOx at the outlet of an SCR reactor in a denitrification system of a large coal-fired unit, and belongs to the field of control. Background technique [0002] At present, China's power industry is developing rapidly. According to the statistics of the National Energy Network, from January to February 2015, the power generation of power plants above designated size nationwide was 856.1 billion kwh, of which thermal power generation was 694.5 billion kwh, accounting for 81.12% of the total. It can be seen that under the current environment, China's power industry is still dominated by thermal power. Coal is the main fuel for thermal power generation, and the part used for thermal power generation accounts for most of the total coal consumption. Compared with advanced countries in the world, China consumes a larger...

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 张少康金秀章尹子剑刘潇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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