CN106094740A - A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward - Google Patents
A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward Download PDFInfo
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- CN106094740A CN106094740A CN201610302290.4A CN201610302290A CN106094740A CN 106094740 A CN106094740 A CN 106094740A CN 201610302290 A CN201610302290 A CN 201610302290A CN 106094740 A CN106094740 A CN 106094740A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
- G05B19/41875—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by quality surveillance of production
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32195—Feedforward quality control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a kind of coordination Control platform improving unit, ensure the fired power generating unit duty control method based on superheater accumulation of heat feedforward of system stable operation, including steam turbine power regulation, boiler combustion regulation and the one-level temperature reducing regulation of superheater, the one-level temperature reducing regulation of described superheater comprises the following steps: AGC load instruction will be conveyed to accumulation of heat feedforward after forming unit load deviation with unit actual load；Accumulation of heat feedforward is converted into the knots modification of one-level attemperation water flow according to unit load deviation, is converted into persistent period and the die-away time of knots modification, and one-level attemperation water flow is adjusted by one-level attemperation water flow regulation valve according to control instruction；Unit actual load is jointly adjusted by the knots modification of one-level attemperation water flow with steam turbine power regulation, and main vapour pressure actual value is jointly adjusted by the knots modification of one-level attemperation water flow with boiler combustion regulation.
Description
Technical field
The invention belongs to Power Plant Thermal automation field, relate to a kind of fired power generating unit duty control method, particularly to
A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward.
Background technology
The load scheduling of unit fired power generating unit is the coordination control realization utilizing boiler oil amount and steam turbine pitch aperture,
Changing load by the way of switch steam turbine pitch aperture is rapidly, and protects by the way of changing boiler oil amount
The energy requirement of card steam turbine is the slowest.Most domestic power plant units uses direct-firing medium-speed milling pulverization system, and boiler steams
It is relatively big that vapour produces time delay, mostly reaches between 2 minutes to 3 minutes, and the serious group of motors time of some long services is longer,
Reaching 5 minutes to 8 minutes, cause unit AGC load responding slow, Load Regulation precision is overproof.In this case, with traditional
AGC control strategy is extremely difficult to the AGC check requirements of scheduling, and can cause unit main steam pressure and main steam temperature significantly
Fluctuation, affects unit safety operation.
During varying duty, due to the significant difference of dynamic characteristic between boiler and steam turbine generator, simply by adjusting
Joint steam turbine pitch aperture changes load, can cause the reverse variation of main steam pressure, and unit load variation tendency slows down.Cause
This, during tradition is coordinated to control, in order to ensure regulating effect, boiler master feedforward needs the overshoot carrying out coal amount to control, will lifting
Coal amount to this load is preceded by advance or deducts.After unit throws upper AGC, dispatch AGC load instruction frequent movement, just have this
Design can cause the fluctuation up and down of coal amount, confluent, causes the more unstable of unit.
In Control System for Thermal Power Units, the command signal equal proportion of numerous controlled parameters is followed fuel quantity command signal and is become
Change, including coal-supplying amount, primary air flow, secondary air flow, direct current cooker feedwater flow, denitration spray ammonia flow etc..Fuel quantity instructs
Fluctuation boiler combustion will be caused to fluctuate, in turn result in primary air pressure, secondary wind pressure, oxygen amount, furnace pressure, superheat steam temperature,
Reheat steam temperature, dum boiler steam water-level or a series of major parameters such as direct current cooker centrum's temperature, DS NOx Est concentration
Fluctuation, unit safety, economy, environmental protection are run and adversely affect, and these parameter fluctuations the most also can affect main steaming
The stability of steam pressure.When unit key parameter instability, its generated output Con trolling index also will necessarily decline.Therefore design
Suitably generated output instruction feed forward control logic, is that unit quickly responds AGC and instructs and ensure self-operating parameter stability
Essential condition, such as Application No.: 201510133100.6, the generated output disclosing a kind of fired power generating unit coordinated control system refers to
Making feed forward control method, its Appropriate application thermal power unit boiler accumulation of heat, (R dispatches mould effectively to alleviate power adjustments scheduling method
Formula) under improve AGC instruction the speed of response and reduce boiler oil amount fluctuation between contradiction.It is possible not only to instruct significantly at AGC
Before ensureing steam turbine during unidirectional change, steam pressure is stable, and boiler can be avoided to fire when AGC instruction the most frequently change
Doses fluctuation, relative to conventional feed forward control program, only increases a low pass filter, it is only necessary to debugging wave filter inertia
This parameter of time, and this parameter is only relevant with boiler heat storage size, has a setting parameter explicit physical meaning, configuration,
The advantages such as debugging process is simple and convenient, but between its most unresolved boiler and steam turbine generator, the significant difference of dynamic characteristic is asked
Topic.
Summary of the invention
It is an object of the invention to overcome the deficiency of above-mentioned technology, thus a kind of fire based on superheater accumulation of heat feedforward is provided
Group of motors duty control method, improves the coordination Control platform of unit, it is ensured that system stable operation.
Invention be employed technical scheme comprise that such: a kind of fired power generating unit spatial load forecasting based on superheater accumulation of heat feedforward
Method, including steam turbine power regulation, boiler combustion regulation and the one-level temperature reducing regulation of superheater, the one-level of described superheater
Temperature reducing regulation comprises the following steps:
S1:AGC load instruction will be conveyed to accumulation of heat feedforward after forming unit load deviation with unit actual load；
S2: accumulation of heat feedforward is converted into the knots modification of one-level attemperation water flow according to unit load deviation, is converted into knots modification
Persistent period and die-away time, and form control instruction, control instruction is sent to the Water flow adjusting valve of one-level attemperator；
S3: one-level attemperation water flow is adjusted by the Water flow adjusting valve of one-level attemperator according to control instruction；
Unit actual load is jointly adjusted by S4: the knots modification of one-level attemperation water flow with steam turbine power regulation,
Main vapour pressure actual value is jointly adjusted by the knots modification of one-level attemperation water flow with boiler combustion regulation.
Improve further: the regulation of described steam turbine power includes: AGC load instruction is formed after limiter of speed speed limit
Unit load setting value, forms load deviation, turbine controller root between unit load setting value and unit actual negative charge values
Unit actual load is controlled according to load deviation regulation door aperture.
Improve further: described boiler combustion regulation includes: main vapour pressure setting value and main vapour pressure actual value it
Between formed force value deviation, boiler controller is according to force value bias adjustment total fuel regulation main vapour pressure actual value.
Improve further: the regulation of described steam turbine power includes: AGC load instruction is formed after limiter of speed speed limit
Unit load setting value, boiler feed-forward calculates corresponding burning regulated quantity according to load setting value, burning regulated quantity with
Total fuel quantity superposition forms fuel quantity instruction and is controlled main vapour pressure actual value.
Improve further: described superheater includes roof enclosure wall pipe, pendant superheater, low temperature superheater, final stage mistake
Hot device, one-level attemperator, two grades of attemperators, described one-level attemperator is arranged at described low temperature superheater and described pendant superheater
Between pipeline on, described two grades of attemperators are arranged on the pipeline between described pendant superheater and described finishing superheater.
By using preceding solution, the invention has the beneficial effects as follows:
Conversed the knots modification of one-level attemperation water flow according to unit load deviation by accumulation of heat feedforward in varying duty, and
Rear change one-level attemperation water flow (i.e. utilizing superheater accumulation of energy), the fuel quantity of boiler side supplements accumulation of energy in time simultaneously, makes boiler
Input energy mates with generation load instruction trend, completes the overall process of unit varying duty response, and this control method can be significantly
Reduce main steam pressure fluctuation and reduce the excessive regulation of total fuel quantity, making unit cooperative control more stable, unit operation more warp
Ji.
Accompanying drawing explanation
Fig. 1 is a kind of fired power generating unit duty control method schematic diagram based on superheater accumulation of heat feedforward of the present invention.
Fig. 2 is varying duty boiler of the present invention instruction and tradition coordination control boiler instruction comparison diagram；
Wherein: curve 1 is boiler instruction change during tradition is coordinated to control；Curve 2 is boiler of the present invention instruction change.
The load change curve chart of Fig. 3 reality of the present invention application；
Wherein: curve 1 represents that steam turbine pitch aperture always instructs；Curve 2 represents one-level attemperation water flow；Curve 3 represents machine
Group load setting value；Curve 4 represents unit actual load；Curve 5 represents main vapour pressure actual value；Curve 6 represents main vapour pressure
Setting value；Curve 7 represents total fuel quantity.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in Figure 1-Figure 3, the present invention discloses a kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward,
The coordination that can be widely applied to fired power generating unit controls, and main steam pressure fluctuation can be greatly decreased and reduce the excessive of total fuel quantity
Regulation, makes unit cooperative control more stable, and unit operation is more economical.Specifically include steam turbine power regulation, boiler combustion regulation
And the one-level temperature reducing regulation of superheater, wherein: steam turbine power regulation, boiler combustion regulation belong to former unit cooperative and control system
System, coordinated control system is improved by by the present invention: adds superheater on the basis of former Coordinated Control Systems and stores
Hot feed forward control loop and one-level desuperheating water control loop.And steam turbine power adjustment control method part is in particular: described
Steam turbine power regulation includes: AGC load instruction forms unit load setting value after limiter of speed speed limit, and unit load sets
Forming load deviation between value and unit actual negative charge values, turbine controller controls unit according to load deviation regulation door aperture
Actual load.
Boiler combustion adjustment control method part is in particular: described boiler combustion regulation includes: main vapour pressure setting value
And forming force value deviation between main vapour pressure actual value, boiler controller is according to force value bias adjustment total fuel regulation master
Steam pressure actual value.
In addition boiler combustion regulation part, in order to solve in prior art, it is ensured that regulating effect, boiler master feedforward needs
The overshoot carrying out coal amount controls, and the coal amount being elevated to this load is preceded by advance or is deducted, and after unit throws upper AGC, dispatches AGC
This defect of load instruction frequent movement, its technical scheme optimized is: cancels tradition and coordinates the pre-coal supply overshoot control in controlling
System feedforward, changes boiler feed-forward control into, and described boiler feed-forward controls to include: AGC load instruction is formed after limiter of speed speed limit
Unit load setting value, boiler feed-forward calculates corresponding burning regulated quantity according to load setting value, burning regulated quantity with
Total fuel quantity superposition forms fuel quantity instruction and is controlled main vapour pressure actual value making boiler input energy refer to generation load
Make trend mate, complete the overall process of unit varying duty response.
The core of the present invention: the one-level temperature reducing regulation of described superheater comprises the following steps:
S1:AGC load instruction will be conveyed to accumulation of heat feedforward after forming unit load deviation with unit actual load；
S2: accumulation of heat feedforward is converted into the knots modification of one-level attemperation water flow according to unit load deviation, is converted into knots modification
Persistent period and die-away time, and form control instruction, control instruction is sent to the Water flow adjusting valve of one-level desuperheat.
S3: one-level attemperation water flow is adjusted by the Water flow adjusting valve of one-level attemperator according to control instruction；
Unit actual load is jointly adjusted by S4: the knots modification of one-level attemperation water flow with steam turbine power regulation,
Main vapour pressure actual value is jointly adjusted by the knots modification of one-level attemperation water flow with boiler combustion regulation, thus realizes utilizing
One-level attemperation water flow changes superheater metal accumulation of heat and quickly responds load scheduling, and instructs reasonable coordination with boiler, holds
Because steam turbine pitch changes the main steam pressure fluctuation caused.
The principle analysis of scheme in prior art: the existing fired power generating unit coordinated control system generated output instruction feedforward
Logical structure is: AGC command signal, after amplitude of variation limiting element, rate of change limiting element, forms that unit is actual sends out
Electrical power command signal, unit actual power power instruction signal, again after an advanced Dynamic mode, forms generated output
Instruction feedforward output signal, but under R scheduling method, when AGC instruction frequently slightly changes, this feedforward is logically present
A significant shortcoming, i.e. differentiation element can cause boiler oil amount big ups and downs occur the amplification of high-frequency signal,
Labor is as follows: owing to differential part output valve is relevant with actual power power instruction rate of change in differentiation element, work as change
Change speed arrange value higher time, even if AGC instruction slightly change, it is very big but lasting that differential part also can export an amplitude
The pulse that time is the shortest, so cause boiler oil amount instruction also occur significantly, the pulse change of short time, work as AGC especially
When instructing frequent small size forward and reverse change, the positive and negative pulse that feed forward control logic meeting output amplitude is very big, the persistent period is the shortest,
Cause fuel quantity instruction significantly to swing, have a strong impact on boiler combustion stability.
The ultimate principle utilizing superheater accumulation of heat to participate in coordinating to control of present invention proposition is: during unit generation, pot
Including a large amount of energy storage in the superheater heat exchange pipeline of furnace side, boiler superheater system includes roof enclosure wall pipe, pendant superheater, low
Temperature superheater, finishing superheater, low temperature superheater is exported on pendant superheater inlet duct arrange one-level attemperator, as slightly
Regulate and control pendant superheater outlet temperature processed；Two grades of desuperheats are arranged on connection pipeline between pendant superheater and finishing superheater
Device, controls finishing superheater outlet temperature as fine tuning.And superheater metal accumulation of heat can be concentrated mainly on convection superheater and screen
In formula superheater, the total accumulation of heat of superheater increases along with the increase of pressure, therefore, regulates one-level desuperheat injection flow rate, changes screen
Metal accumulation of heat in formula superheater pipeline, makes entrance main steam flow change, and the change of main steam flow coordinates steam turbine
Tune to open that degree is collaborative to be regulated and controled unit actual load, the change of main steam flow coordinates boiler combustion to regulate by master
Steam pressure actual value regulates and controls, such that it is able to reach the short time to change the power of the assembling unit and the purpose of main steam pressure.
After method of the present invention is carried out through engineering approaches process, it is applied in certain power plant 340MW Subcritical Units, process
As follows: to carry out one-level spray water flux upset test, to obtain one-level spray water flux and machine in high, neutralization underload section the most respectively
Characteristic relation between group main steam pressure and unit load, every time before test, unit is maintained at steady state condition；Process of the test
In, steam turbine and boiler are cut manually entirely, and steam turbine pitch aperture remains unchanged, and the holding of coal feeder of boiler rotating speed is stable, and (coal-supplying amount is not
Become), test data is as shown in table 1, from table 1 it will be seen that after the change of one-level attemperation water flow, unit main steam pressure and machine
Group changing load is rapid, substantially delays between 15 seconds to 20 seconds；One-level attemperation water flow changes the unit load caused and increases
Reaching more than 10MW, the main steam pressure of unit is affected and reaches 0.6MPa, by test data by the one-level attemperation water flow of unit
By data matching, show that the system model between one-level attemperation water flow and unit load, main steam pressure is as shown in table 2,
And the mathematical model of table 2 is inserted in accumulation of heat feedforward module.
Table 1 attemperation water flow attribute testing data
Table 2 each operating mode one-level attemperation water flow and load and main steam pressure model
The relationship model obtained from experimental result and data matching, we can show that lifting load variation value and one-level subtract
Warm water changes in flow rate amplitude, persistent period, functional relationship die-away time, as shown in table 3.
Table 3 each operating mode load and one subtracts flow parameter respective function table
The boiler feed-forward function of boiler controller curve 1 as shown in Figure 2 changes into curve 2 respective function, and wherein unit is born
The functional relationship of lotus and total fuel quantity is as shown in table 4.
Table 4 unit load and total fuel quantity functional relationship table
Record unit load up changing trend diagram, load change is in the range of 260MW-275MW, the change speed of load instruction
Rate is 2%Pe, and the dynamic deviation of load exists, and within 3MW, maximum pressure deviation is 0.2MPa, and dynamic process meets Control platform
From curve, requirement, as it is shown on figure 3, can be seen that the load variations initial stage that the present invention proposes is changed by one-level attemperation water flow
Varying duty, stablizing the control strategy of main steam pressure, the linear steadily total fuel quantity of control of the curve 2 in Fig. 2 press in boiler instruction,
In figure, curve 1 represents that steam turbine pitch aperture always instructs；Curve 2 represents one-level attemperation water flow；Curve 3 represents that unit load sets
Definite value；Curve 4 represents unit actual load；Curve 5 represents main vapour pressure actual value；Curve 6 represents main vapour pressure setting value；Bent
Line 7 represents total fuel quantity.
Embodiment described above has been shown and described the ultimate principle of the present invention and principal character and advantage thereof, the industry
Skilled person will appreciate that, the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and explanation
The principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these
Changes and improvements both fall within scope of the claimed invention, claimed scope by appending claims and
Its equivalent defines.
Claims (5)
1. a fired power generating unit duty control method based on superheater accumulation of heat feedforward, it is characterised in that: include steam turbine power
Regulation, boiler combustion regulation and the one-level temperature reducing regulation of superheater, the one-level temperature reducing regulation of described superheater includes following step
Rapid:
S1:AGC load instruction will be conveyed to accumulation of heat feedforward after forming unit load deviation with unit actual load；
S2: accumulation of heat feedforward is converted into the knots modification of one-level attemperation water flow according to unit load deviation, is converted into holding of knots modification
Continuous time and die-away time, and form control instruction, control instruction is sent to the Water flow adjusting valve of one-level attemperator；
One-level attemperation water flow is adjusted by S3: one-level attemperation water flow regulation valve according to control instruction；
Unit actual load is jointly adjusted by S4: the knots modification of one-level attemperation water flow with steam turbine power regulation, one-level
Main vapour pressure actual value is jointly adjusted by the knots modification of attemperation water flow with boiler combustion regulation.
A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward the most according to claim 1, its feature
It is: the regulation of described steam turbine power includes: AGC load instruction forms unit load setting value, machine after limiter of speed speed limit
Forming load deviation between group load setting value and unit actual negative charge values, turbine controller is opened according to load deviation regulation door
Degree controls unit actual load.
A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward the most according to claim 1, its feature
It is: described boiler combustion regulation includes: between main vapour pressure setting value and main vapour pressure actual value, form force value deviation, pot
Furnace controller is according to force value bias adjustment total fuel regulation main vapour pressure actual value.
A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward the most according to claim 3, its feature
Being: described boiler combustion regulation also includes boiler feed-forward control, described boiler feed-forward controls to include: AGC load instruction is passed through
Forming unit load setting value after limiter of speed speed limit, boiler feed-forward calculates corresponding burning regulation according to load setting value
Amount, burning regulated quantity superposes formation fuel quantity instruction and is controlled main vapour pressure actual value with total fuel quantity.
A kind of fired power generating unit duty control method based on superheater accumulation of heat feedforward the most according to claim 1, its feature
Be: described superheater include roof enclosure wall pipe, pendant superheater, low temperature superheater, finishing superheater, one-level attemperator, two
Level attemperator, described one-level attemperator is arranged on the pipeline between described low temperature superheater and described pendant superheater, described
Two grades of attemperators are arranged on the pipeline between described pendant superheater and described finishing superheater.
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