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Main steam temperature predictive control method of ultra supercritical unit of thermal power plant

A technology for ultra-supercritical units and thermal power plants, which is applied in control systems, adaptive control, general control systems, etc., and can solve problems such as difficulty in understanding the meaning of advanced control algorithms and lack of correlation between system characteristics.

Active Publication Date: 2014-04-02
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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Problems solved by technology

The controller parameters of the advanced control algorithm and the system characteristics of the actual control object lack a clear correlation meaning, so it is difficult for operators who are familiar with PID parameter adjustment to understand the meaning of the advanced control algorithm

Method used

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  • Main steam temperature predictive control method of ultra supercritical unit of thermal power plant
  • Main steam temperature predictive control method of ultra supercritical unit of thermal power plant
  • Main steam temperature predictive control method of ultra supercritical unit of thermal power plant

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Embodiment Construction

[0046] The technical solutions of the present invention will be further described below through embodiments in conjunction with the accompanying drawings.

[0047] The invention has a layered control structure, which is composed of two loop controls, the direct control at the bottom layer and the direct optimization at the upper layer. The upper layer is the guidance optimization layer, including model parameter identification module, prediction optimization module and PID parameter tuning module, respectively realizing model parameter identification, prediction optimization and PID parameter tuning functions.

[0048] The direct control loop at the bottom layer is a cascade system structure, and the bottom layer includes two loop controls, the main loop and the secondary loop. The PID controller for the DCS system is still used.

[0049] The underlying direct control loop control introduces a generalized control algorithm, and the performance index at time t is the following ...

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Abstract

The invention relates to a main steam temperature predictive control method of an ultra supercritical unit of a thermal power plant. A layered control structure is arranged, the layered control structure consists of a bottom direct control layer and an upper guide optimization layer, and the upper guide optimization layer realizes model parameter identification, prediction optimization and PID (Proportion Integration Differentiation) parameter setting control; and the bottom direct control layer is in a cascade system structure and comprises main loop control and assistant loop control, and a PID controller orienting a DCS (distributed control system) is directly controlled. The control method can be used for replacing a control engineer to set PID parameters, on-line model identification and control parameter setting methods are directly adopted to achieve the purpose of main steam temperature self-adaptive control, the application of an advanced control technology and an intelligent optimization technology under a DCS is realized, the stability and the robustness are stronger, and a changing process of a controlled object model of the main steam temperature under a variable load can be adapted.

Description

technical field [0001] The invention relates to a method for predicting and controlling the main steam temperature of an ultra-supercritical generating set in a thermal power plant. Background technique [0002] The main steam temperature of the boiler generator set in a thermal power plant is an important parameter that needs to be monitored during the operation of the once-through boiler. If it is too high or too low, it will affect the safe and economical operation of the unit. As high-parameter and large-capacity units gradually participate in power grid peak regulation, the load of the unit will change greatly, and the temperature of the main steam will also undergo drastic changes. Optimizing the main steam temperature prediction control method and improving the control accuracy and stability can reduce the occurrence of pipe burst accidents and improve the unit's rapid response ability to variable loads, which is of great significance to the long-term safe and economi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B35/12G05B13/04
Inventor 陈世和李昕韩玲方彦军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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