A control method to prevent high-profile door shaking of the unit through nonlinear calculation of valve position

Abstract

The present invention relates to a control method for preventing the sloshing of the high-profile door of the unit through the non-linear operation of the valve position, comprising the following steps: 1) collecting the valve position opening data of the high-pressure regulating valve within a period of time, and calculating the statistical average value A1 within the period of time ; 2) Subtract the expected value of the valve position opening of the high-pressure regulating valve from A1, and perform dead-zone nonlinear calculation to obtain the valve position deviation A2 of the high-pressure regulating valve; 3) Perform nonlinear PI calculation on A2 to obtain the main steam pressure correction value, add the main steam pressure correction value and the original main steam pressure setting value to get the corrected main steam pressure. Compared with the prior art, the present invention can maintain the opening of the high-profile door close to the expected opening in different load segments, which not only prevents the high-profile door from swaying greatly, but also significantly reduces the throttling loss at the air intake end of the unit, achieving safety and Considering the economy, it has promotion value.

Description

technical field [0001] The invention relates to an optimal control method for thermal power generation, in particular to a control method for preventing the high-profile door of a unit from swaying through a non-linear operation of a valve position. Background technique [0002] Compared with small-capacity units, supercritical units with one million kilowatts have obvious advantages in operating economy. However, with the increase of surplus capacity in the power grid and changes in the power market structure, it is the general trend for millions of units to participate in deep peak regulation of the power grid. The large deviation between the condition and the design value has seriously affected the safety and economy of the operation of this type of unit. How to improve the safety and economy of this type of unit in part-load operation is an important topic worthy of research. [0003] The steam distribution mechanism of Siemens million-kilowatt units is generally configu...

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