A Single-loop Superheated Steam Temperature Active Disturbance Rejection Control Method with Disturbance Compensation

Abstract

The invention proposes a single-loop superheated steam temperature automatic disturbance rejection control method for disturbance compensation, which belongs to the technical field of automatic control. This method belongs to the weak model control strategy and does not require an accurate mathematical description of the superheated steam temperature object of the thermal power unit; the reduced-order first-order extended state observer algorithm is used to compensate the value of the previous calculation step of the desuperheating water object, and the compensation of the current calculation step is obtained value; the output value of the current step of the superheated steam temperature system and the compensation value of the current step are input into the extended state observer for calculation, and the tracking value of the output value of the superheated steam temperature system and the tracking value of the total disturbance are obtained, and then through The input values ​​of the last two calculation steps of the superheated steam temperature system are calculated, so that the system can adjust the opening of the desuperheating water valve in real time according to the calculation results. Compared with the traditional cascade control of superheated steam temperature, the present invention simplifies the structure of the control system, and simultaneously can take into account the tracking and anti-interference ability of the closed-loop system, and has better control quality.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a disturbance compensation single-loop superheated steam temperature automatic disturbance rejection control method. Background technique [0002] At present, such as chemical process, thermal process and other large-scale industrial production process control, proportional-integral (PI) control and proportional-integral-derivative (Proportional-integral-derivative, PID) control are still the main control strategies. This is because PI and PID are simple and easy to implement, and there are many parameter tuning methods. However, with the increasing control requirements in industrial processes, traditional PI or PID controllers are difficult to obtain satisfactory control effects. Active Disturbance Rejection Control (ADRC) technology was proposed by researcher Han Jingqing. Its core idea is to integrate modeling errors, external disturbances and high-order...

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Problems solved by technology

[0004] The purpose of this invention is to solve the shortcomings of the current superheated steam temperature cascade control system, such as complex structure, difficult parameter setting, and large fluctuations caused by secondary disturbances, and propose a single-loop superheated steam temperature improved self-resistance based on disturbance compensation. The disturbance control method aims to simplify the structure of the superheated steam temperature control system, and has good reference tracking and anti-disturbance ability, which provides good support for further promoting the field application of ADRC in the process control of large inertia and large delay in industry

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