CN108915793A - It draws up under a kind of power grid high-frequency accident the control method of Steam Turbine Over-speed Accident - Google Patents
It draws up under a kind of power grid high-frequency accident the control method of Steam Turbine Over-speed Accident Download PDFInfo
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- CN108915793A CN108915793A CN201810571340.8A CN201810571340A CN108915793A CN 108915793 A CN108915793 A CN 108915793A CN 201810571340 A CN201810571340 A CN 201810571340A CN 108915793 A CN108915793 A CN 108915793A
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- load
- speed
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- accident
- isolated network
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/02—Shutting-down responsive to overspeed
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The present invention relates to a kind of control methods for turbine speed hypervelocity of drawing up under power grid high-frequency accident.By multi-faceted amendment steam turbine comprehensive valve bit instruction, unit load is quickly reduced, eliminates the difference in Isolated Network System between supply load and power load, the frequency stabilization for improving isolated power grid is horizontal.When turbine speed reaches 3040, the speed ascended to heaven according to turbine speed and the amplitude ascended to heaven calculate grid power amount of unbalance, it is converted into corresponding comprehensive valve place value, unit load is reduced by closing turbine governor valve in advance, eliminates the difference in Isolated Network System between supply load and power load.Comprehensive valve bit instruction is restored to K2 times before OPC movement, can further decrease unit load, eliminate the difference in Isolated Network System between supply load and power load, make the Isolated Network System electricity equilibrium of supply and demand by the comprehensive valve bit instruction after being resetted by amendment OPC.Ascending to heaven for turbine speed can effectively be inhibited, greatly improve Isolated Network System operation stability.
Description
Technical field
The present invention relates to fired power generating unit turbine speed control methods, and in particular to vapour of drawing up under a kind of power grid high-frequency accident
The control method of turbine hypervelocity.
Background technique
Isolated Network System is the special method of operation under electric system extreme case, if certain piece power grid has under single failure
The load got rid of is more than 8% (removal of load rate be 8%) of network load and has a possibility for forming island network, moment lose compared with
Multi-purpose electric load causes power grid supply load and power load uneven, also, all generating sets in most Isolated Network Systems
Specific gravity shared by fired power generating unit is larger in area power grid, and self-balancing ability is poor, it is same it is load unbalanced can cause it is larger
The frequency fluctuation of amplitude, causes Steam Turbine Over-speed Accident, if cannot quickly inhibit Steam Turbine Over-speed Accident, may cause compressor emergency shutdown causes
Mains breakdown.
Currently, it is primary frequency modulation and OPC that fired power generating unit, which commonly inhibits the mode of Steam Turbine Over-speed Accident,（Over-speed
Protection Control）, but the primary frequency modulation amplitude of accommodation is limited, when more unbalanced power occurs in Isolated Network System, adjusts
Save ineffective, such as application No. is 201310309143.6 Chinese patents；Conventional OPC movement energy rapid-transport line, when OPC is multiple
Turbine governor valve is opened to OPC and acts preceding aperture behind position, easily causes OPC perseveration, is unfavorable for the quick steady of Isolated Network System
It is fixed.Therefore the control method for studying Steam Turbine Over-speed Accident of drawing up in Isolated Network System has especially important meaning.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide it is a kind of design rationally, performance
Reliably, the control method for power grid high-frequency accident tubine hypervelocity of easily and fast drawing up is realized.
The present invention solve the above problems used by technical solution be：It draws up under a kind of power grid high-frequency accident Steam Turbine Over-speed Accident
Control method, which is characterized in that by multi-faceted amendment steam turbine comprehensive valve bit instruction, quickly reduce unit load, eliminate
Difference in Isolated Network System between supply load and power load, the frequency stabilization for improving isolated power grid is horizontal, reaches vapour of drawing up
Turbine hypervelocity, protection steam turbine equipment safe and stable operation purpose, while playing the work for avoiding unit OPC frequent movement
With.
More specifically, it is ascended to heaven different operating conditions according to turbine speed, by switching switch according to its actual motion shape
State switches to different counter circuits.Switching switch represents turbine speed when ascending to heaven to different value, the amendment of comprehensive valve bit instruction
Quantity.
More specifically, when turbine speed is ascended to heaven to 3040rpm, primary frequency modulation movement at this time has been completed, will not
Further work；By correcting comprehensive valve bit instruction, makes unit load rapid decrease, eliminate supply load in Isolated Network System
Difference between power load.
More specifically, the implementation of amendment comprehensive valve bit instruction is：Function is closed in comprehensive valve position in advance, i.e., instructs originally
On the basis of, certain aperture K1 is closed in advance, and the parameters such as the speed that K1 ascends to heaven according to turbine speed and the amplitude ascended to heaven determine, pre- to close
Amount control avoids the rapid increase of boiler side main steam pressure, superheated steam is caused to be pacified within the 50% of former comprehensive valve bit instruction
Air cock movement threatens unit safety operation；When the difference in Isolated Network System between supply load and power load is little, pass through
The frequency stabilization for realizing Isolated Network System is closed in comprehensive valve position in advance, inhibits ascending to heaven for turbine speed.
More specifically, when the difference in Isolated Network System between supply load and power load accounts for the ratio of entire network load
When weight is larger, in first of measure for inhibiting turbine speed, the i.e. pre- pass valve bit instruction in 3040rpm, cannot draw up vapour
When turbine revolving speed is further ascended to heaven, turbine speed continues to rise to 3090rpm, will trigger OPC protection act, unit load is fast
Speed decline, after OPC resets, comprehensive valve bit instruction is restored to K2 times before movement, and between 0 ~ 1, OPC further drops K2 after restoring
Underload makes the Isolated Network System electricity equilibrium of supply and demand, keeps away to eliminate the difference in Isolated Network System between supply load and power load
Exempt from OPC frequent movement, the frequency stabilization for improving isolated power grid is horizontal.After OPC resets, if comprehensive valve bit instruction is restored to OPC and moves
Value before work, unit load rise to movement before value, at this time in Isolated Network System supply and demand be still it is unbalanced, easily cause
OPC perseveration, is unfavorable for the stable operation of Isolated Network System, may cause Isolated Network System collapse when serious.Therefore, OPC resets
Afterwards, comprehensive valve bit instruction cannot be restored to the value before OPC movement, but be restored to K2 times before movement.
Compared with prior art, the present invention having the following advantages that and effect：Pass through multi-faceted amendment steam turbine comprehensive valve position
Instruction.When turbine speed reaches 3040rpm, the speed ascended to heaven according to turbine speed and the amplitude ascended to heaven, rough calculation
Grid power amount of unbalance out is converted into corresponding comprehensive valve place value, by closing turbine governor valve in advance, reduces unit load,
The difference in Isolated Network System between supply load and power load is eliminated, returns isolated network frequency in 50Hz or so.Pass through amendment
Comprehensive valve bit instruction is restored to K2 times before OPC movement by the comprehensive valve bit instruction after OPC reset（K2 is between 0 ~ 1）, OPC
Load can be further decreased after recovery, to eliminate the difference in Isolated Network System between supply load and power load, make isolated network system
The system electricity equilibrium of supply and demand, the frequency stabilization for improving isolated power grid are horizontal.Effectively inhibit flying for turbine speed in the above manner
It rises, avoids overspeed protection movement even mains breakdown, greatly improve Isolated Network System operation stability.
Detailed description of the invention
Fig. 1 be draw up under power grid high-frequency accident in the embodiment of the present invention Steam Turbine Over-speed Accident control method valve bit instruction amendment
Logic relation picture.
Fig. 2 is the valve position tracking loop of Steam Turbine Over-speed Accident control method of drawing up under power grid high-frequency accident in the embodiment of the present invention
Relational graph.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, a kind of control method for Steam Turbine Over-speed Accident of drawing up under power grid high-frequency accident passes through multi-faceted amendment steamer
Machine comprehensive valve bit instruction quickly reduces unit load, eliminates the difference in Isolated Network System between supply load and power load, makes
Isolated network frequency maintains 50Hz or so, improves the stability of operation of power networks, and can draw up Steam Turbine Over-speed Accident well, protects steam turbine
The safe and stable operation of equipment.
Switching switch represents turbine speed when ascending to heaven to different value, and the modified quantity of comprehensive valve bit instruction can be according to vapour
Turbine speed fling lifting difference operating condition switches to different counter circuits according to its practical operating status by switching switch.
When turbine speed is ascended to heaven to 3040rpm, primary frequency modulation movement at this time has been completed, and will not further be acted as
With, but comprehensive valve bit instruction can be corrected, make unit load rapid decrease, eliminates supply load and power load in Isolated Network System
Between difference.Implementation is：Function is closed in comprehensive valve position in advance, i.e., on the basis of original instruction, closes certain aperture K1 in advance
（K1 can be determined according to the parameters such as the speed that turbine speed is ascended to heaven and the amplitude ascended to heaven, and be controlled in former comprehensive valve bit instruction
Within 50%）If the difference in Isolated Network System between supply load and power load is little（Between supply load and power load
Difference account for the specific gravity of entire network load and be adjusted in margin range less than 8%, and in unit）, can be pre- by comprehensive valve position
The frequency stabilization for realizing Isolated Network System is closed, ascending to heaven for turbine speed is inhibited.
When the difference in Isolated Network System between supply load and power load is larger（Between supply load and power load
Difference account for entire network load specific gravity be greater than 8%）, in first of measure for inhibiting turbine speed, i.e., in 3040rpm
Pre- pass valve bit instruction, when the turbine speed that cannot draw up further is ascended to heaven, turbine speed continues to rise to 3090rpm, will
Trigger OPC（Over-speed Protection Control）Protection act, unit load rapid decrease are comprehensive after OPC resets
If closing the value that valve bit instruction is restored to before OPC movement, unit load rises to the value before movement, and supply and demand is still in Isolated Network System at this time
Be so it is unbalanced, easily cause OPC perseveration, be unfavorable for the stable operation of Isolated Network System, may cause isolated network when serious
System crash.Therefore, after OPC resets, comprehensive valve bit instruction cannot be restored to the value before OPC movement, but before being restored to movement
K2 times（K2 is between 0-1）, OPC can further decrease load after restoring, to eliminate supply load and electricity consumption in Isolated Network System
Difference between load makes the Isolated Network System electricity equilibrium of supply and demand, and the frequency stabilization for improving isolated power grid is horizontal.
It referring to fig. 2, is steam turbine valve bit instruction tracking loop, when inhibiting hypervelocity loop start（And steam turbine is gone to greatly
In 3040rpm, or it is greater than 3090rpm）, it is current valve position instruction target value that comprehensive valve command, which is generated circuit antitracking, real
The no-harass switch in existing valve bit instruction circuit.
The technical scheme adopted by the invention is that：
The conventional mode for inhibiting Steam Turbine Over-speed Accident is primary frequency modulation and OPC, but the primary frequency modulation amplitude of accommodation is limited, works as Isolated Network System
When there is more unbalanced power, regulating effect is bad；Conventional OPC movement energy rapid-transport line, steam turbine tune after OPC resets
Section valve is opened to OPC and acts preceding aperture, easily causes OPC perseveration, is unfavorable for the fast and stable of Isolated Network System.Therefore by more
Steam turbine comprehensive valve bit instruction is corrected in orientation, quickly reduces unit load, eliminates supply load and power load in Isolated Network System
Between difference, so that isolated network frequency is maintained 50Hz or so, the power grid high-frequency accident tubine that can effectively draw up exceed the speed limit phenomenon.
The first step：It is increased when mains frequency moment, when turbine speed is ascended to heaven to 3040rpm, corrects comprehensive valve bit instruction,
Make unit load rapid decrease, eliminates the difference in Isolated Network System between supply load and power load.Implementation is：Starting
Function is closed in comprehensive valve position in advance, i.e., on the basis of original instruction, closes certain aperture K1 in advance（K1 can ascend to heaven according to turbine speed
Speed and the parameters such as the amplitude ascended to heaven determine, and control within the 50% of former comprehensive valve bit instruction）If being supplied in Isolated Network System
Difference between electric load and power load is little（Difference between supply load and power load accounts for the ratio of entire network load
Again less than 8%）, the frequency stabilization for realizing Isolated Network System can be closed in advance by comprehensive valve position, inhibit ascending to heaven for turbine speed.
Second step：Comprehensive valve bit instruction after being resetted by amendment OPC, before comprehensive valve bit instruction is restored to OPC movement
K2 times（K2 is between 0 ~ 1）, OPC can further decrease load after restoring, to eliminate supply load and electricity consumption in Isolated Network System
Difference between load makes the Isolated Network System electricity equilibrium of supply and demand, and the frequency stabilization for improving isolated power grid is horizontal.In the above manner
Effectively inhibit ascending to heaven for turbine speed, avoids overspeed protection movement even mains breakdown, it is steady to greatly improve Isolated Network System operation
It is qualitative.
According to the control method of Fig. 1, Logical Configuration is carried out in DEH control of valve position circuit, and carries out valve bit instruction by Fig. 2
Tracking, when inhibiting hypervelocity loop start, it is current valve position instruction target value that comprehensive valve command, which is generated circuit antitracking, real
The no-harass switch in existing valve bit instruction circuit.
By correcting steam turbine comprehensive valve bit instruction, being able to achieve quickly reduces unit load, and abatement Isolated Network System load supplies
Aequum is needed, when the control of boiler side should synchronize progress, the i.e. parameter of boiler accordingly（Coal amount, water, air quantity etc.）It should be with vapour
Turbine energy requirement matches, and runs boiler-turbine coordinated, conducive to the long-term safety stable operation of unit, power grid.
Calculation method described in this specification, constant K1, K2 value can be specific numerical value, can also be according to vapour
Ascend to heaven rate and the amplitude dynamic calculating of ascending to heaven of turbine revolving speed.
It draws up under power grid high-frequency accident of the invention the control method of Steam Turbine Over-speed Accident, it is comprehensive by multi-faceted amendment steam turbine
Close valve bit instruction, the first step：When turbine speed reaches 3040, the speed ascended to heaven according to turbine speed and the width ascended to heaven
Degree, is roughly calculated out grid power amount of unbalance, is converted into corresponding comprehensive valve place value, by closing turbine governor valve in advance, drops
Low unit load eliminates the difference in Isolated Network System between supply load and power load, returns isolated network frequency on the left side 50Hz
It is right；Second step：Comprehensive valve bit instruction is restored to K2 times before OPC movement by the comprehensive valve bit instruction after being resetted by amendment OPC
（K2 is between 0 ~ 1）, OPC can further decrease load after restoring, come eliminate in Isolated Network System supply load and power load it
Between difference, make the Isolated Network System electricity equilibrium of supply and demand, the frequency stabilization for improving isolated power grid is horizontal.Effectively suppression in the above manner
Turbine speed processed is ascended to heaven, and is avoided overspeed protection movement even mains breakdown, is greatly improved network system operation stability.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (5)
1. a kind of control method for Steam Turbine Over-speed Accident of drawing up under power grid high-frequency accident, which is characterized in that pass through multi-faceted amendment vapour
Turbine comprehensive valve bit instruction quickly reduces unit load, eliminates the difference in Isolated Network System between supply load and power load,
The frequency stabilization for improving isolated power grid is horizontal, reaches Steam Turbine Over-speed Accident of drawing up, the safe and stable operation of protecting steam turbine equipment
Purpose, while playing the role of avoiding unit OPC frequent movement.
2. the control method for Steam Turbine Over-speed Accident of drawing up under power grid high-frequency accident according to claim 1, which is characterized in that root
It ascends to heaven different operating conditions according to turbine speed, different calculating time is switched to according to its practical operating status by switching switch
Road.
3. the control method for Steam Turbine Over-speed Accident of drawing up under power grid high-frequency accident according to claim 1, which is characterized in that when
When turbine speed is ascended to heaven to 3040rpm, primary frequency modulation movement at this time has been completed, and will not further be worked；By repairing
Positive comprehensive valve bit instruction, makes unit load rapid decrease, eliminates the difference in Isolated Network System between supply load and power load.
4. the control method for Steam Turbine Over-speed Accident of drawing up under power grid high-frequency accident according to claim 3, which is characterized in that repair
The implementation of positive comprehensive valve bit instruction is：Function is closed in comprehensive valve position in advance, i.e., on the basis of original instruction, closes certain aperture in advance
The parameters such as the speed that K1, K1 ascend to heaven according to turbine speed and the amplitude ascended to heaven determine that pre- pass amount control refers in former comprehensive valve position
Within 50% enabled, the rapid increase of boiler side main steam pressure is avoided, the movement of superheated steam safety door is caused to threaten unit safety
Operation；When the difference in Isolated Network System between supply load and power load is little, is closed in advance by comprehensive valve position and realize isolated network
The frequency stabilization of system inhibits ascending to heaven for turbine speed.
5. the control method for Steam Turbine Over-speed Accident of drawing up under power grid high-frequency accident according to claim 3, which is characterized in that when
When difference in Isolated Network System between supply load and power load is larger, in first of measure for inhibiting turbine speed, i.e.,
Pre- pass valve bit instruction in 3040rpm, when the turbine speed that cannot draw up further is ascended to heaven, turbine speed is continued to rise to
3090rpm will trigger OPC protection act, unit load rapid decrease, after OPC resets, before comprehensive valve bit instruction is restored to movement
K2 times, K2 between 0 ~ 1, OPC restore after further decrease load, to eliminate supply load and power load in Isolated Network System
Between difference, make the Isolated Network System electricity equilibrium of supply and demand, avoid OPC frequent movement, the frequency stabilization for improving isolated power grid is horizontal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810571340.8A CN108915793B (en) | 2018-06-06 | 2018-06-06 | Control method for inhibiting turbine overspeed under high-frequency accident of power grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810571340.8A CN108915793B (en) | 2018-06-06 | 2018-06-06 | Control method for inhibiting turbine overspeed under high-frequency accident of power grid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980654A (en) * | 2019-03-18 | 2019-07-05 | 中国华电科工集团有限公司 | A kind of power grid high-frequency accident decline load prediction device and process |
| CN112865176A (en) * | 2021-01-15 | 2021-05-28 | 福建晋江热电有限公司 | Isolated network switching control method, system, device and storage medium |
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| CN106194290A (en) * | 2016-07-08 | 2016-12-07 | 国网河南省电力公司电力科学研究院 | A kind of fired power generating unit OPC policy optimization method being applicable to lonely net/microgrid |
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| CN102619580A (en) * | 2011-01-31 | 2012-08-01 | 华北电力科学研究院有限责任公司 | Method and system for controlling one-time frequency modulation |
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| CN109980654A (en) * | 2019-03-18 | 2019-07-05 | 中国华电科工集团有限公司 | A kind of power grid high-frequency accident decline load prediction device and process |
| CN109980654B (en) * | 2019-03-18 | 2024-04-02 | 中国华电科工集团有限公司 | Power grid high-frequency accident descending load prediction device and process |
| CN112865176A (en) * | 2021-01-15 | 2021-05-28 | 福建晋江热电有限公司 | Isolated network switching control method, system, device and storage medium |
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