Multi-model predictive control design method for supercritical thermal power generating unit coordination control system

A technology for coordinating control systems and thermal power units, applied in general control systems, control/regulation systems, electrical program control, etc., can solve problems such as heavy calculation load, complex controller structure, and difficult engineering applications

Active Publication Date: 2020-07-24
LIAOCHENG XINYUAN GRP CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there are nonlinear problems in the coordinated system. If the coordinated control strategy adopts nonlinear predictive control technology, there are problems such as complex controller structure and heavy calculation load, which is not easy for engineering application.

Method used

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  • Multi-model predictive control design method for supercritical thermal power generating unit coordination control system
  • Multi-model predictive control design method for supercritical thermal power generating unit coordination control system
  • Multi-model predictive control design method for supercritical thermal power generating unit coordination control system

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Embodiment Construction

[0083] Considering that the dynamic characteristic relationship between each sub-circuit in the coordination system is a self-balancing process but there are some inverse response characteristics, a perfect second-order model is used to simplify the controlled process, the model has zero points, and the coordination object of the supercritical thermal power unit A 3×3 multi-input and multi-output object can be used, and the range of local load point cells can be represented by the model shown in formula (1):

[0084]

[0085] In formula (1), k ij (i, j=1, 2, 3) is the gain coefficient, T ij (i,j=1,2,3), T abc (a, b=1,2,3; c=1,2) is the time constant, τ ij (i, j=1, 2, 3) is the delay time, and S is the Laplacian operator. Based on formula (1), the estimated prediction of the coordinated system output can use the following expression:

[0086]

[0087] In formula (2), y 1 (s), y 2 (s), y 3 (s) is the system output, u 1 (s), u 2 (s), u 3 (s) is the system input. ...

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Abstract

The invention discloses a multi-model predictive control design method for a supercritical thermal power generating unit coordination control system based on a spatial metric algorithm, is used for controlling a supercritical coal-fired unit machine-furnace coordination system, and belongs to the field of thermal power engineering and automatic control. At present, machine-furnace coordination control systems of most power plants are designed based on conventional PID; during large-range variable-working-condition operation, performance of the coordinated control system is degraded due to thecharacteristics of large hysteresis, nonlinearity and time variation of a machine-furnace coordinated controlled object, so that the problems of low load regulation rate, poor precision, large main steam pressure and steam temperature fluctuation and the like of a unit in the operation process are caused. According to the invention, the traditional predictive control is properly simplified to realize the simplified design of linear predictive control; secondly, specific sub-model selection is realized in combination with a space measurement algorithm; and finally, a weighted soft switching strategy with simple calculation is provided for the integration of a plurality of sub-controllers, so that load regulation performance of a 660MW unit and operation stability of the unit can be remarkably improved, and the engineering requirements are met.

Description

technical field [0001] The invention relates to a multi-model predictive control design method for a coordinated control system of a supercritical thermal power unit based on a space metric algorithm, and belongs to the fields of thermal power engineering and automatic control. Background technique [0002] At present, the theme of my country's energy development is to achieve energy transformation while ensuring energy supply. It is imperative for thermal power units to participate in deep peak regulation of the power grid to accept new energy. The controlled object of an ultra-supercritical unit has the characteristics of large inertia, nonlinearity, time-varying, and strong coupling. At the same time, frequent and large-scale variable load adjustments further aggravate the nonlinear influence of the unit. In order to achieve the strategic goal of national energy transformation, thermal power units, which are the most reliable and bear the largest load share among the exis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418G05B13/04
CPCG05B13/0275G05B13/042G05B19/418Y02P90/02
Inventor 张玉雷王宗民宋世伟张正领林凡举张正玉张道林韩铁岭张德领李吉涛王晓冰
Owner LIAOCHENG XINYUAN GRP CO LTD
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