Method of Improving Speed ​​Regulation of Steam Pump Based on Chopper Control

A control method and technology of steam pump, applied in the direction of pump control, non-variable-capacity pump, machine/engine, etc., can solve the problem that the PID control loop cannot effectively suppress the fluctuation, and achieve the effect of suppressing the disturbance of the steam pump

Active Publication Date: 2022-03-04
大唐国际发电股份有限公司陡河热电分公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 of Improving Speed ​​Regulation of Steam Pump 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 the speed adjustment of the steam pump based on chopping control. Firstly, the steam pump control system is set as a DCS system, a new logic controller MEH is built in the DCS system, and the control mode is set in the MEH system: first, monitor the field The actual adjusted quantity x, x is an irregular sine wave curve; then, recurse on x: G(x')=Ke ‑τx / tx+1, to get a relatively smooth sine wave curve x'; make y=x-x', and then recurse y: G(y')=Ke ‑τy / ty+1, to get a curve y' that is slightly smoother than y; make y"=y-y', where, y" fluctuates up and down at 0 along the time axis; when y>0, then judge The curve is in the second and third quadrants; when y”>0, it can be reliably judged that the adjusted variable x is entering the second quadrant, which means that the curve is in the second quadrant. cut off even if x t+1 =x t +(‑x t ), where x is the adjusted quantity, t is the current moment, and the amount of anti-adjustment fluctuation that will appear at the next moment will be reduced.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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
Owner 大唐国际发电股份有限公司陡河热电分公司
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