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Real-time calculation method for steam turbine exhaust enthalpy based on least squares support vector machine

A support vector machine and least squares technology, applied in computing, computer parts, data processing applications, etc., can solve problems such as overfitting, and achieve the effect of convenient and direct calling

Inactive Publication Date: 2018-10-12
XIAN THERMAL POWER RES INST CO LTD
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AI Technical Summary

Problems solved by technology

The artificial neural network algorithm to calculate the exhaust enthalpy of the low-pressure cylinder of the steam turbine tends to fall into a local extreme value, and it is also prone to "over-fitting" phenomenon

Method used

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  • Real-time calculation method for steam turbine exhaust enthalpy based on least squares support vector machine
  • Real-time calculation method for steam turbine exhaust enthalpy based on least squares support vector machine
  • Real-time calculation method for steam turbine exhaust enthalpy based on least squares support vector machine

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] like figure 1 As shown, the present invention provides a method for real-time calculation of steam turbine exhaust enthalpy based on least squares support vector machine, comprising the following steps:

[0044] 1) Collect historical steady-state data

[0045] In the production process database system of the power plant, historical data (unit load, main steam flow, pressure and temperature, pressure and temperature after regulating stage, inlet steam pressure and temperature of intermediate pressure cylinder, etc.) are extracted from the historical data of steam turbine under normal operation and full load Parameters, high pressure cylinder exhaust pressure and temperature, low pressure cylinder exhaust pressure and temperature and other exhaust steam parameters, steam turbine eight-stage regenerative system extraction steam extraction pressure ...

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Abstract

The invention discloses a real-time calculation method for steam turbine exhaust enthalpy based on a least squares support vector machine, wherein the steam inlet parameters such as unit load, main steam flow, pressure and temperature, pressure and temperature after regulation stage, steam inlet pressure and temperature of intermediate pressure cylinder are used as input variables; at the same time, the steam exhaust parameters such as pressure and temperature of high pressure cylinder, steam exhaust and temperature of low pressure cylinder and the like are selected as input variables; in addition, the steam extraction parameters such as steam extraction pressure and temperature of an eight-stage regenerative system of the steam turbine are selected as the input variables; a total of 28 parameters are used as the input variables of the least squares support vector machine model; the exhaust steam enthalpy of the low pressure cylinder of the steam turbine is used as the output variableto establish an exhaust enthalpy real-time calculation model of the low pressure cylinder of the steam turbine based on the least squares support vector machine. By training the least squares supportvector machine model, the calculation model of the exhaust enthalpy of the low pressure cylinder of the steam turbine is obtained, which is convenient for real-time call in online monitoring.

Description

technical field [0001] The invention belongs to the technical field of energy and power, and specifically relates to a real-time calculation method of exhaust steam enthalpy of a steam turbine based on a least squares support vector machine, which is suitable for online calculation of exhaust steam enthalpy of a low-pressure cylinder of a steam turbine, online calculation of the efficiency of a low-pressure cylinder of a steam turbine, and steam turbine exhaust enthalpy. On-line economic analysis of the thermal system of a turbine-generator unit. Background technique [0002] As the power generation industry gradually enters the information age, it is necessary to calculate the economics of the steam turbine unit online. The difficulty lies in the online calculation of the exhaust steam enthalpy of the low-pressure cylinder of the steam turbine. The grade of the exhaust steam from the low-pressure cylinder of the steam turbine is low, and it is wet steam. In addition to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/06G06K9/62
CPCG06Q10/04G06Q50/06G06F18/2411
Inventor 杨斌杨永军
Owner XIAN THERMAL POWER RES INST CO LTD
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