Method for controlling main steam temperature in power plant based on simplified second-order auto disturbance rejection controller

A technology of active disturbance rejection controller and control method, applied in electric controllers, controllers with specific characteristics, etc., can solve problems such as being easily affected by system parameter changes, weak anti-interference ability, poor adaptability, etc., and achieve parameter Easy to adjust, simple algorithm, good robust effect

Inactive Publication Date: 2012-02-22
SHANDONG ELECTRIC POWER SCHOOL
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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing control strategy in the main steam temperature control process of the power plant, such as poor adaptability, weak anti-interference ability, and easy to be affected by system parameter changes, this patent proposes a simplifi

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  • Method for controlling main steam temperature in power plant based on simplified second-order auto disturbance rejection controller
  • Method for controlling main steam temperature in power plant based on simplified second-order auto disturbance rejection controller
  • Method for controlling main steam temperature in power plant based on simplified second-order auto disturbance rejection controller

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Embodiment Construction

[0010] The relevant technical contents not mentioned below can adopt or learn from the prior art.

[0011] Such as figure 1 , 2 As shown, a power plant main steam temperature control method based on a simplified second-order active disturbance rejection controller, including a simplified second-order active disturbance rejection controller, a PID controller, and a leading zone object output θ 1 , inert zone object output θ 2 , where the preamble object outputs θ 1 Negative feedback forms an inner loop at the front-end node of the PID controller, and the object in the inert area is output θ 2 The output negative feedback forms an outer loop at the front-end node of the simplified second-order active disturbance rejection controller;

[0012] The described simplified second-order linear active disturbance rejection controller comprises a second-order tracking differentiator, a PD controller, and a temperature controlled object controlled by a cascaded input connection, ...

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Abstract

The invention discloses a method for controlling a main steam temperature in a power plant based on a second-order simplified auto disturbance rejection controller. In the method, a cascade control mode is used for forming a cascade steam temperature mediation and control system; in an inner ring, proportion integration differentiation (PID) adjustment is used for eliminating the deviation of an advance timing steam temperature to achieve a coarse tuning effect on an overheating steam temperature; in an outer ring, the simplified second-order auto disturbance rejection controller is used for controlling the outlet temperature of an overheater, so that the defects of large inertia and large delay of a temperature object in an inertia area are fully overcome; and by a disturbance compensation effect of the simplified second-order auto disturbance rejection controller, the disturbance of factors such as loads, flue gas and the like is eliminated, so that the stability of the main steam temperature is ensured. In the method, an algorithm is simple, a parameter is easy to adjust, and a higher response speed, higher steady state accuracy, higher disturbance resistance and higher robustness can be well acquired without dependence on a mathematical model with an accurate main steam temperature in the power plant.

Description

technical field [0001] The invention relates to a temperature control method of a power plant, in particular to a temperature control method of main steam in a power plant based on a simplified second-order active disturbance rejection controller. Background technique [0002] At present, maintaining the stability of superheated steam temperature during boiler operation is of great significance for reducing equipment loss and ensuring the safe operation of the entire heating network. However, the complex characteristics of the main steam temperature control object, such as time-varying, uncertain and nonlinear, bring certain difficulties to conventional control. The traditional PID cascade control scheme is mostly used in the main steam temperature control system of traditional thermal power plants; however, it is difficult to use conventional PID control due to the uncertainty of model parameters and problems such as environmental changes and component aging during the oper...

Claims

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Application Information

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IPC IPC(8): G05B11/42
Inventor 纪恩庆孙艳萍孙永福丁超杜燕张立华王琳
Owner SHANDONG ELECTRIC POWER SCHOOL
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