Boiler drum water level PID parameter setting method

Abstract

The invention provides a boiler drum water level PID parameter setting method, which comprises the following steps: a) for a given transfer function model of feed water flow for drum water level and a transfer function model of a PID controller, to begin with, determining sampling time and sampling frequency, and then, carrying out Z transformation on the transfer functions to obtain corresponding difference equations of the transfer functions; b) selecting a fitness function capable of judging whether the PID regulating parameters are optimum; c) initializing three parameters of the PID controller and improving relative parameters of a gravity search algorithm; and d) through the improved gravity search algorithm, setting boiler drum water level PID controller parameters. The method adopts the improved gravity search algorithm to set the boiler drum water level PID controller parameters; and simulation research shows that the method is better than an engineering setting method and a method for optimizing the PID controller parameters based on a genetic algorithm, has better global searching ability, can enable the boiler drum water level control effect to be better and is higher in robustness.

Description

technical field [0001] The invention relates to a method for setting PID parameters of boiler drum water level based on an improved gravitational search algorithm, and belongs to the technical field of control. Background technique [0002] With the continuous development of science and technology, the level of industrial automation in my country is getting higher and higher, and computer intelligent control systems have been widely used in all walks of life in society. The main task of computer control systems is to control the main controlled quantities of industrial objects. Perform automatic control to keep industrial objects operating in the required good condition. [0003] For a boiler with a steam drum, the water level of the steam drum is an important parameter for the safe operation of the boiler and a very important controlled variable. Maintaining the water level of the steam drum within a certain range is the first condition to ensure the safe operation of the b...

AI Technical Summary

Problems solved by technology

Of course, some scholars use the method of combining intelligent algorithms with other intelligent systems to tune PID parameters, but the accuracy achieved is not very high, and the algorithm process is complicated

[0005] To sum up, although many scholars have conducted a lot of research, a comprehensive intelligent algorithm has not been found so far, which can make the control system achieve higher precision and better robustness, resulting in the control of boiler drum water level. The accuracy is not high, and the anti-interference ability of the system is not strong

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