CN103485835A - Backpressure protection control method for 300MW high back pressure unit system - Google Patents
Backpressure protection control method for 300MW high back pressure unit system Download PDFInfo
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- CN103485835A CN103485835A CN201310394689.6A CN201310394689A CN103485835A CN 103485835 A CN103485835 A CN 103485835A CN 201310394689 A CN201310394689 A CN 201310394689A CN 103485835 A CN103485835 A CN 103485835A
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Abstract
The invention provides a backpressure protection control method for a 300MW high back pressure unit system. The method comprises the steps of first reducing the operating load of a unit when safety margin of backpressure protection is smaller than 0; continuously reducing the operating load of the unit when the change rate of the safety margin with time is greater than 0 until the safety margin of backpressure protection is not smaller than 0; increasing the operating load of the unit when the change rate of the safety margin with time is smaller than 0 until the safety margin of backpressure protection is not smaller than 0. The load of the unit is adjusted according to the value of the safety margin, so that automatic control over the backpressure of the 300MW high back pressure unit system is realized, and the safety coefficient of the 300MW high back pressure unit system is improved.
Description
Technical field
The present invention relates to a kind of back-pressure protection controlling method of 300MW High Back Pressure Steam Turbine Units system, belong to motor heating equipment technical field.
Background technique
300MW High Back Pressure Steam Turbine Units system, when operation, is moved in safety range in order to guarantee exhaust stage blade, and back pressure during unit operation must be in the back pressure restraining line.Once the unit operation back pressure outside the back pressure restraining line, needs unit is controlled to adjustment.Existing control adjustment strategy is when the unit back pressure is excessive, by regulating a secondary heat supply network flow, the unit back pressure is reduced, but clearly this kind of method governing speed is slower, and effect is undesirable, be difficult to accomplish accurately control and adjust back pressure, have larger potential safety hazard.
Summary of the invention
The present invention for solve existing 300MW High Back Pressure Steam Turbine Units when the operation when the unit back pressure is excessive, be difficult to accurately control the problem of adjustment back pressure, and then a kind of back-pressure protection controlling method of 300MW High Back Pressure Steam Turbine Units system be provided.For this reason, the invention provides following technological scheme:
A kind of back-pressure protection controlling method of 300MW High Back Pressure Steam Turbine Units system comprises:
When the margin of safety of back-pressure protection is less than 0, at first reduce unit operation load, if described margin of safety over time rate be greater than at 0 o'clock, continue to reduce the unit operation load, until the margin of safety of back-pressure protection is not less than 0;
If described margin of safety rate over time is less than at 0 o'clock, increase the unit operation load, until the margin of safety of back-pressure protection is not less than 0.
The back-pressure protection controlling method of 300MW High Back Pressure Steam Turbine Units system provided by the invention; value by margin of safety is adjusted the unit operation load; realized the back pressure of 300MW High Back Pressure Steam Turbine Units system is controlled automatically, and improved the safety coefficient of 300MW High Back Pressure Steam Turbine Units system.
The accompanying drawing explanation
Fig. 1 is the safety margin definition schematic diagram of the back-pressure protection that provides of the specific embodiment of the present invention.
Embodiment
Below in conjunction with the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiments.Embodiment based in the present invention, those of ordinary skills, not making all other embodiments that obtain under the creative work prerequisite, belong to the scope of protection of the invention.
The specific embodiment of the present invention provides a kind of back-pressure protection controlling method of 300MW High Back Pressure Steam Turbine Units system, comprising:
When the margin of safety of back-pressure protection is less than 0, at first reduce unit operation load, if described margin of safety over time rate be greater than at 0 o'clock, continue to reduce the unit operation load, until the margin of safety of back-pressure protection is not less than 0;
If described margin of safety rate over time is less than at 0 o'clock, increase the unit operation load, until the margin of safety of back-pressure protection is not less than 0.
Concrete, the unit after low vacuum modification, move in safety range in order to guarantee exhaust stage blade, and back pressure during unit operation must be in the back pressure restraining line.Once the unit operation back pressure outside the back pressure restraining line, needs unit is controlled to adjustment.
The back-pressure protection margin of safety of this embodiment definition unit is: as shown in Figure 1, the warning back pressure in the lower corresponding back-pressure protection curve of unit operation load on alarming line and the difference of unit operation back pressure are formulated as follows:
R
S＝P
A-P
B
R wherein
sfor margin of safety, P
aand P
bbe respectively the warning back pressure on alarming line and unit operation back pressure in the back-pressure protection curve.The situation of utilizing the back-pressure protection margin of safety to carry out the corresponding control strategy of steam turbine as benchmark is as follows:
1) be more than or equal to 0 when the back-pressure protection margin of safety, the unit back pressure operation is in the zone that is perfectly safe;
2) be less than 0 be more than or equal to-5KPa when the back-pressure protection margin of safety, the unit back pressure operation is in the criticality safety zone, and now steam turbine control system provides alarm, according to circumstances judges whether to assign regulating command;
3) if be less than-5KPa of back-pressure protection nargin, the unit back pressure operation is shut down the deathtrap outside line, steam turbine control system provides the instruction of regulating load makes unit operation to safety zone.
In the time of be less than-5KPa of margin of safety, need steam turbine control system to provide to regulate the instruction of load to make unit operation to safety zone, and or the load that adds deduct be also one variable to be determined arranged.This embodiment adopts fuzzy control method to determine to add or load shedding, and its control law is as follows:
1. be more than or equal at 0 o'clock for margin of safety, unit is in safety zone or the criticality safety district, and now unit normally moves according to load control order, does not need to carry out back-pressure protection control.
2. be less than at 0 o'clock for margin of safety, unit need to be paid the utmost attention to back-pressure protection and control, and need to regulate as follows:
A. rule of thumb first to unit, reduce the signal of load:
When margin of safety over time rate be greater than 0
the time, margin of safety is described, and speed is for just over time, and unit operation is just moving closer to safety zone, now continues to reduce the signal of load to unit, until the margin of safety of back-pressure protection is not less than 0.
When margin of safety over time rate be less than 0
the time, illustrate that the margin of safety temporal evolution, more and more away from safety zone, now increases the signal of load shedding the signal of load instead, until the margin of safety of back-pressure protection is not less than 0.
B. when margin of safety is more than or equal to zero, illustrate that unit is in safety zone or the criticality safety district, now unit normally moves according to load control order, does not need to carry out back-pressure protection control.
Fuzzy rule is set accordingly is:
Given unit load shedding signal:
In formula, N means load, and t is the time,
the slope that means load increase and decrease, R
smean back-pressure protection nargin.
The technological scheme that adopts this embodiment to provide, adjusted the unit operation load by the value of margin of safety, realized the back pressure of 300MW High Back Pressure Steam Turbine Units system is controlled automatically, and improved the safety coefficient of 300MW High Back Pressure Steam Turbine Units system.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the embodiment of the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (2)
1. the back-pressure protection controlling method of a 300MW High Back Pressure Steam Turbine Units system, is characterized in that, comprising:
When the margin of safety of back-pressure protection is less than 0, at first reduce unit operation load, if described margin of safety over time rate be greater than at 0 o'clock, continue to reduce the unit operation load, until the margin of safety of back-pressure protection is not less than 0;
If described margin of safety rate over time is less than at 0 o'clock, increase the unit operation load, until the margin of safety of back-pressure protection is not less than 0.
2. the back-pressure protection controlling method of 300MW High Back Pressure Steam Turbine Units system according to claim 1, is characterized in that, described margin of safety is the warning back pressure on alarming line and the difference of unit operation back pressure in the lower corresponding back-pressure protection curve of unit operation load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310394689.6A CN103485835A (en) | 2013-10-30 | 2013-10-30 | Backpressure protection control method for 300MW high back pressure unit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310394689.6A CN103485835A (en) | 2013-10-30 | 2013-10-30 | Backpressure protection control method for 300MW high back pressure unit system |
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| CN103485835A true CN103485835A (en) | 2014-01-01 |
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| CN201310394689.6A Pending CN103485835A (en) | 2013-10-30 | 2013-10-30 | Backpressure protection control method for 300MW high back pressure unit system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935558A (en) * | 1974-12-11 | 1976-01-27 | United Technologies Corporation | Surge detector for turbine engines |
| US4218878A (en) * | 1978-04-28 | 1980-08-26 | Westinghouse Electric Corp. | Acceleration monitoring system for protecting gas turbine against damaging operation at resonant speeds |
| CN1234848A (en) * | 1996-11-08 | 1999-11-10 | 西门子公司 | Turbine control device and method for regulating load alternation process in turbine |
| US20040128035A1 (en) * | 2002-12-30 | 2004-07-01 | Vandervort Christian L. | System and method for steam turbine backpressure control using dynamic pressure sensors |
-
2013
- 2013-10-30 CN CN201310394689.6A patent/CN103485835A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935558A (en) * | 1974-12-11 | 1976-01-27 | United Technologies Corporation | Surge detector for turbine engines |
| US4218878A (en) * | 1978-04-28 | 1980-08-26 | Westinghouse Electric Corp. | Acceleration monitoring system for protecting gas turbine against damaging operation at resonant speeds |
| CN1234848A (en) * | 1996-11-08 | 1999-11-10 | 西门子公司 | Turbine control device and method for regulating load alternation process in turbine |
| US20040128035A1 (en) * | 2002-12-30 | 2004-07-01 | Vandervort Christian L. | System and method for steam turbine backpressure control using dynamic pressure sensors |
Non-Patent Citations (1)
| Title |
|---|
| 郭钰锋，于达仁，赵晓敏: "直接空冷机组背压保护控制方法", 《中国高等学校电力系统及自动化专业第二十四届学术年会论文集》 * |
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Application publication date: 20140101 |