Turbine valve control optimization method based on DEH system

An optimization method and valve control technology, which is applied to mechanical equipment, engine components, machines/engines, etc., can solve the problem of low efficiency of the regulating stage, and achieve the effect of stable pressure change and flow rate change

Inactive Publication Date: 2017-11-24
DATANG DONGBEI ELECTRIC POWER TESTING & RES INST
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AI Technical Summary

Problems solved by technology

The flow characteristic of the curve with the largest overlap has the best linearity, but the efficiency of the regulation stage is the lowest

Method used

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  • Turbine valve control optimization method based on DEH system
  • Turbine valve control optimization method based on DEH system

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Embodiment Construction

[0026] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] This embodiment is based on the DEH system valve control optimization method for steam turbine units, including:

[0028] The DEH system exits the primary frequency regulation, exits the automatic generation control AGC, and the steam turbine unit switches to the valve-controlled operation mode;

[0029]The main steam pressure of the steam turbine unit is controlled within a predetermined range, that is, the predetermined range of the main steam is the main steam pressure of the boiler of the steam turbine unit in a state of no overpressure and stable combustion. The valves of the steam turbine unit operate in a single-valve mode. When the valves operate in a singl...

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Abstract

The invention relates to a turbine valve control optimization method based on a DEH system. The method includes the steps that a turbine unit exits from primary frequency modulation and AGC, and the turbine unit can be switched to be in a valve control mode for detection; relevant flow calculation data obtained when valves of the turbine unit operate in a single-valve mode and relevant flow calculation data obtained when the valves of the turbine unit operate in a sequence valve mode are acquired on the premise that the main steam pressure of the turbine unit is within a preset range; actual flow data of the valves at different opening degrees are calculated according to the obtained relevant flow calculation data, test data are fitted with a least square method and a neural network algorithm through combination of the valve opening degrees corresponding to the actual flow, the fitting effect is verified after fitting with the test data, and an actual valve opening degree-flow curve is obtained after verification is successful; and the DEH system obtains the valve opening degree-flow curve, and the opening degrees of all the valves are controlled based on the valve opening degree-flow curve.

Description

technical field [0001] The invention relates to a control optimization method of a steam turbine valve based on a DEH system. Background technique [0002] The digital electro-hydraulic control system (DEH) adopts computer control technology to control the working process of the steam turbine through digital calculation and software programming. DEH system has the flexibility of digital system, the rapidity of analog system and the reliability of hydraulic system. Due to flexible and diverse control functions and precise adjustment quality, it has achieved high economy and stability, and has been widely used in steam turbine control systems. The difference between the DEH control system and the traditional mechanical-hydraulic regulating system is that each high-pressure steam inlet regulating valve of the steam turbine is controlled by its own servo amplifier, electro-hydraulic converter and oil motor, and the regulating valves can be positioned independently. Regardless ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D17/26
CPCF01D17/26
Inventor 张腾宇方国春任晓辰张勇鹏刘博明
Owner DATANG DONGBEI ELECTRIC POWER TESTING & RES INST
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