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Self-reduction multi-loop centralized predictive control system for reheat steam temperature of secondary reheat unit

A technology of reheating steam temperature and secondary reheating, which is applied in general control systems, control/regulation systems, adaptive control, etc., can solve problems such as failure to achieve results, and achieve large lag, good robustness, and principle clear effect

Active Publication Date: 2018-04-13
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the traditional PID control is used, the ideal effect cannot be achieved, which requires us to explore other control schemes

Method used

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  • Self-reduction multi-loop centralized predictive control system for reheat steam temperature of secondary reheat unit
  • Self-reduction multi-loop centralized predictive control system for reheat steam temperature of secondary reheat unit
  • Self-reduction multi-loop centralized predictive control system for reheat steam temperature of secondary reheat unit

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Embodiment Construction

[0065] Below in conjunction with embodiment further set forth this inventive method.

[0066] Such as figure 1 Shown is a schematic diagram of a self-decreasing multi-loop centralized predictive control system for the reheat steam temperature of a double reheat unit. The reheat steam temperature control system includes the flue gas recirculation fan speed control loop and the opening of the flue gas baffle Control loop, the input of the reheat steam temperature control system is the flue gas recirculation fan speed and the opening of the flue gas baffle, and its output is the primary reheat steam temperature and secondary reheat steam temperature. There is coupling, and the object has a large inertia, and a predictive control algorithm that can be reduced is used. figure 1 Middle: The input data are the speed of the flue gas recirculation fan and the opening of the flue gas baffle; the output data are the primary reheat steam temperature and the secondary reheat steam tempera...

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Abstract

The invention discloses a self-reduction multi-loop centralized predictive control system for reheat steam temperature of a secondary reheat unit. The system is composed of a flue gas recirculation fan rotation speed control loop and a flue gas damper opening degree control loop. The deviation of the primary reheat steam temperature and the secondary reheat steam temperature from a set value is sent to a predictive controller. The optimized values of the flue gas recirculation fan rotation speed and the flue gas damper opening degree are calculated to ensure that the primary reheat steam temperature and the secondary reheat steam temperature of the unit are maintained within a reasonable and safe range. According to the invention, predictive control is used to easily handle the optimization of a large inertia multivariable system; the calculation process is clear and simple; during engineering application, programming is easy to implement; the corresponding control amount can be adjusted in time for the prediction of future output deviation; the primary reheat steam temperature and the secondary reheat steam temperature are stable within a reasonable range, which ensures the stability and safety of the unit; and the control system has a better control effect than traditional PID control.

Description

technical field [0001] The invention relates to a self-decreasing order multi-loop centralized predictive control system for reheating steam temperature of a double reheating unit, which belongs to the field of thermal power engineering and automatic control. Background technique [0002] With the further improvement of the economic requirements of thermal power units, the units continue to develop to higher parameters, and adopt the double reheating technology to further improve the efficiency of the units. At the same time, the complexity of the unit is further increased, the inertia of the controlled object is increased, and the requirements for the control of the reheated steam temperature are higher. The reheat steam temperature of the double reheat unit is generally controlled by adjusting the speed of the flue gas recirculation fan and the opening of the flue gas baffle, and the adjustment of desuperheating water is generally used for accidental water spraying. The c...

Claims

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Application Information

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IPC IPC(8): G05B13/04
CPCG05B13/042G05B13/048
Inventor 蔡戎彧吕剑虹于吉
Owner SOUTHEAST UNIV
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