Method for improving steam pump rotating speed regulation based on chopper control

A control method and steam pump technology, applied in pump control, non-variable pumps, machines/engines, etc., can solve the problem that the PID regulation loop cannot effectively suppress fluctuations, and achieve the effect of suppressing the disturbance of the steam pump

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that in the existing steam pump speed control, the PID regulation loop cannot effectively suppress fluctuations due to large disturbances

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  • Method for improving steam pump rotating speed regulation based on chopper control
  • Method for improving steam pump rotating speed regulation based on chopper control

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Embodiment Construction

[0017] Under the stable working condition of a single steam source output, the moment the newly input steam source intervenes to do work, the high pressure will cause the sudden increase in the speed of the steam turbine, and the system cannot digest the sudden increase in pressure, causing system disturbance. The disturbance is due to the increase of the system load, and the steam pump needs a higher-pressure air source to maintain the load, resulting in an uncertain time point when the new high-pressure air source (main steam, 14MPa) and the original low-pressure air source (auxiliary steam and Four-stage steam extraction, 1-3MPa) overlapping, the original automatic control logic of the system cannot effectively overcome the energy disturbance, resulting in periodic oscillation of the regulated system or even the divergence of the regulated quantity, which eventually leads to the shutdown of the steam pump. If the divergence of the regulated quantity is not timely control, an...

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Abstract

The invention provides a method for improving steam pump rotating speed regulation based on chopper control. The method comprises the following steps of firstly, setting a steam pump control system as a DCS, newly building a logic controller MEH in the DCS, and setting a control mode in the MEH, specifically, firstly monitoring a field actual regulated quantity x which is in an irregular sine wave curve; then, enabling the x to be subjected to recursion, wherein G(x') =Ke-tau x/tx+1, and obtaining a relatively smooth sine wave curve x'; enabling y to be equal to x-x', then, conducting recursion on y, wherein G(y') =Ke-tau y/ty+1, and obtaining a curve y' which is slightly smooth compared with y; enabling y'' to be equal to y-y', wherein y'' fluctuates up and down at the value of 0 along the time axis; when y is larger than 0, judging that the curve is in a second quadrant and a third quadrant; when y'' is larger than 0, reliably judging that the current adjusted quantity x is entering the second quadrant and the representative curve is in the second quadrant, finally, executing a chopper behavior to cut off the instant adjustment amplitude, and even if xt+1=xt+(-xt), wherein x is the adjusted quantity, t is the current moment, reducing the reverse adjustment fluctuation quantity to occur at the next moment.

Description

technical field [0001] The technical field of this patent is automatic control of thermal power plants Background technique [0002] Unit steam pump speed control is an important part of the automatic control of thermal power plants. At present, most domestic companies use basic PID adjustment strategies, supplemented by certain feed-forward logic for adjustment. Due to this technical means, the steam pumps of thermal power plants are equipped with auxiliary steam, four-stage steam extraction, and main steam three-way gas source steam supply configuration, which can be switched under different working conditions. The traditional PID regulator cannot quickly stabilize the speed under the condition of gas source switching, resulting in a large amount of disturbance in the gas source switching function, especially the four-stage steam extraction and steam supply switching of high-pressure gas source. Differential pressure fluctuations have a great impact on the water flow rate...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00
CPCF04D27/004F04D27/001
Inventor 韩冬阚玉英高亚杰张浩军罗健群郑永涛
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