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Superheated steam temperature active-disturbance-rejection cascade control method based on multi-objective optimization

A technology of multi-objective optimization and active disturbance rejection controller, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as lack of practical application, computational complexity, difficult function block realization, etc. To achieve the effect of ensuring stability and robustness, improving robustness, and eliminating disturbances

Inactive Publication Date: 2018-09-04
SOUTHEAST UNIV
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Problems solved by technology

Although the simulation results show good results, these methods are ultimately not practical due to the computational complexity and they are difficult to implement through the functional blocks of the distributed control system

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  • Superheated steam temperature active-disturbance-rejection cascade control method based on multi-objective optimization
  • Superheated steam temperature active-disturbance-rejection cascade control method based on multi-objective optimization
  • Superheated steam temperature active-disturbance-rejection cascade control method based on multi-objective optimization

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Embodiment Construction

[0060] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0061] Such as figure 1 Shown is the ADRC cascade control block diagram of the present invention, in which the inner loop adopts a traditional PI controller, which can quickly eliminate the disturbance. The controller of the outer loop is an active disturbance rejection controller based on multi-objective optimization. By observing the disturbance state through the extended state observer, it can quickly eliminate the disturbance and ensure the efficient and stable operation of the system. At the same time, the multi-objective optimization particle swarm optimization algorithm is used to solve the problem The design frequency of the expanded state observer balances the two indicators of robustness and stability, so as to optimize the performance of the controller and improve the operating efficiency. Among them, r is the set value of super...

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Abstract

The invention discloses a superheated steam temperature active-disturbance-rejection cascade control method based on multi-objective optimization. The superheated steam temperature active-disturbance-rejection cascade control method adopts double loop control, wherein an inner loop is a PI controller, and an outer loop is a multi-objective optimized active-disturbance-rejection controller; the multi-objective optimized active-disturbance-rejection controller regards a valve opening degree of a superheated steam temperature system as input, and regards an outlet temperature of the superheated steam temperature system as output; a frequency stable region is obtained by adopting a calculation method ensuring system stability, the frequency of an augmented state observer is searched by adopting a multi-objective intelligent optimization algorithm in the frequency stable region, a state of disturbance is observed by means of the augmented state observer, and rapid disturbance elimination isrealized. The superheated steam temperature active-disturbance-rejection cascade control method can precisely adjust the flow rate of the desuperheating water, quickly suppresses the influence of load changes on main steam temperature, improves the power generation efficiency of a boiler, and ensures the service life of metal equipment and the safe operation of a power station.

Description

technical field [0001] The invention belongs to the technical field of automatic control of energy utilization, and in particular relates to a superheated steam temperature self-disturbance rejection cascade control method based on multi-objective optimization. Background technique [0002] In recent years, renewable energy sources such as solar, wind and tidal power have flourished in the electricity market. However, the intermittence of renewable energy inevitably brings great challenges to the reliability of utility grids. Therefore, it is a mature and feasible solution to quickly adjust the power of coal-fired power plants to balance real-time loads, and focus on changing the safe range of load demand without violating the superheater steam temperature operating constraints. Usually, a wider range of power regulation will result in a larger deviation between the superheated steam temperature and its set point, so the difference must be controlled within a safe range. P...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 孙立符灏李东海潘凤萍胡康涛
Owner SOUTHEAST UNIV
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