Boiler temperature adjusting method and system based on numerical differentiation

Abstract

The invention discloses a boiler temperature adjusting method and system based on numerical differentiation, a differentiator realized by adopting a numerical differentiation algorithm based on a Newton interpolation polynomial is relatively small in calculated amount, and the differentiator realized by utilizing the method is high in accuracy of a differentiation link, good in frequency characteristic and relatively good in high-frequency noise suppression effect, and the structure is simple and easy to realize. Due to the fact that an ideal differentiator does not exist in actual life and is not easy to achieve physically, and temperature sampling points in a boiler system are often distributed at equal intervals, the numerical differentiation algorithm is achieved based on the first-order derivative of a Newton interpolation polynomial, and the purpose is to achieve the purpose of solving the problem through selecting proper interpolation points and sampling step lengths. Therefore, a better differential effect can be realized.

Description

technical field [0001] The invention belongs to the field of boiler temperature control, and relates to a boiler temperature adjustment method and system based on numerical differentiation. Background technique [0002] In the boiler temperature control system, temperature is an inertial system with delay characteristics as the controlled object. A differentiator is needed in the traditional boiler temperature control PID control method. The problem of numerical differentiation has been studied by many domestic and foreign scholars from the middle of the last century to the present, and rich scientific research results have been obtained. Using the discrete data of the function to approximate the differential at the nodes is usually called numerical differentiation. There are two main reasons why many scholars pay so much attention to the numerical differential problem. One is that the numerical differential problem is a typical ill-posed problem in the sense of Hadamard, t...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a boiler temperature adjustment method and system based on numerical differentiation, so as to solve the problem that the implementation process of the differentiator for boiler temperature control in the prior art is complicated and the amount of calculation is large in actual use. , the problem of poor control effect

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