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Supercritical machine set steam temperature control method and system based on multivariable predictive control

An ultra-supercritical unit, predictive control technology, applied in the direction of temperature control using electric methods, can solve problems such as lag adjustment, achieve the effect of overcoming interference and maintaining stability, and good application prospects

Active Publication Date: 2012-10-03
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

However, due to the fact that the traditional PID controller is a hysteresis regulation in essence, there are many deficiencies in the control quality of the PID type steam temperature control system.

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  • Supercritical machine set steam temperature control method and system based on multivariable predictive control
  • Supercritical machine set steam temperature control method and system based on multivariable predictive control
  • Supercritical machine set steam temperature control method and system based on multivariable predictive control

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Embodiment Construction

[0019] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 1 As shown, a method for controlling the steam temperature of an ultra-supercritical unit based on multivariable predictive control is characterized in that it includes the following steps:

[0021] In step S101, the preliminary design of the multivariable predictive controller is carried out, mainly to determine the control variable, the controlled variable and the disturbance variable.

[0022] When applying multivariable predictive controllers, it is necessary to be very familiar with process objects. Therefore, in this step, the designer needs to be familiar with the relevant knowledge of the process object, communicate with the operator and technical personnel, and complete the pre-design of the controller. Because the selection of variables is very closely related to the entire process, i...

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Abstract

The invention provides a supercritical machine set steam temperature control method and system based on multivariable predictive control. The method includes the steps of: conducting pre-stage designing of a multivariable predictive controller to determine the control variables, the controlled variables and the disturbance variables, wherein the control variables include first stage temperature reducing water spray, second stage temperature reducing water spray, reheated temperature reducing water spray and the opening size of a fume gas baffle, and the controlled variables include main steam temperature and reheated steam temperature; discriminating a module of a process object and building a multi-input and multi-output step response model of the steam temperature system by applying step disturbance, simulating the multivariable predictive controller and adjusting the parameters of the multivariable predictive controller according to the built step response model; starting the multivariable predictive controller and switching the multivariable predictive controller from the simulated state to the actual online operation and control state and applying the output of the multivariable predictive controller to a controlled object to carry out real-time control. The supercritical machine set steam temperature control method and system can well ensure that the overheated steam temperature in a boiler is within the required range.

Description

technical field [0001] The invention relates to the technical field of thermal process control, in particular to a method for controlling the steam temperature of an ultra-supercritical unit based on multivariable predictive control and an ultra-supercritical unit steam temperature control system based on multivariable predictive control. Background technique [0002] The automatic control of the thermal system of the power plant has always been one of the hot issues in the control field. With the rapid development of the social economy, the working conditions of the production system are becoming more and more complex, and the requirements are increasing. The control system often presents multi-variable, strong coupling, The wide range of working conditions and high comprehensive requirements for control performance make the research on this problem more complicated. Compared with traditional generator sets, the DC ultra-supercritical power generation method is more efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/19
Inventor 陈世和张曦阎威武罗嘉李晓枫王国良
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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