CN109378833A - A method of unit fast frequency hopping is realized by control extraction flow of steam - Google Patents
A method of unit fast frequency hopping is realized by control extraction flow of steam Download PDFInfo
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- CN109378833A CN109378833A CN201811273080.2A CN201811273080A CN109378833A CN 109378833 A CN109378833 A CN 109378833A CN 201811273080 A CN201811273080 A CN 201811273080A CN 109378833 A CN109378833 A CN 109378833A
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- steam
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- boiler
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
Abstract
A method of unit fast frequency hopping being realized by control extraction flow of steam, it is therefore an objective to improve Turbo-generator Set and adapt to online load variations ability；The method of the present invention is when both unit actual load PE and network load instruction P0 are deviated, control computer controls steam extraction adjustment while issuing instruction to boiler controller, turbine controller, control instruction PC is adjusted by steam extraction to adjust height and add porthole and low add porthole switching value, boiler instruction PB, steam turbine instruction PT are issued to control boiler combustion adjustment amount, steam turbine throttle aperture amount by boiler controller and turbine controller, three aspect closed-loop controls are equal with network load instruction P0 to actual load PE.
Description
Technical field
The present invention relates to a kind of methods for realizing unit fast frequency hopping by control extraction flow of steam.
Background technique
In the power system, Automation generation control (Automatic Generation Control) is energy management
A critical function in system EMS, AGC are to adjust multiple generated powers output in different power plants to respond the change of load
The system of change.Generating set is in defined power output adjusting range, the instruction that tracking power scheduling mechanism of exchange issues, according to one
Determine regulations speed and adjust generated output in real time, to meet the service of power system frequency and dominant eigenvalues control requirement, guarantees
Generated output and balancing the load, guarantee system frequency are rated value.After monoblock receives AGC instruction, pass through load control system system
System completes instantaneous Load Regulation.Load control system is also known as coordinated control system, is using boiler, steam turbine and subsidiary engine as one
The sufficiently complex multivariable control system that a entirety is controlled, the fuel of organic, coordination the control boiler of the system are sent
Wind, water supply and steam turbine regulating valve door aperture keep the influence between each variable minimum.Because controlled device has multivariable strong simultaneously
The various controls theory such as coupling, non-linear, big inertia large delay, slow time-varying generally acknowledges uncontrollable characteristic, at present in thermal motor
It is very extensive that group coordinated control system is theoretically related to face with the research in engineering.With the increase of electrical network capacity, power grid pair
Power supply quality it is more demanding.It is required that realized by the AGC and primary frequency modulation of power grid, and the normal investment of unit AGC function
Establishing has on good Control platform basis in Coordinated Control Systems.Currently, fired power generating unit is automatic to meet power grid
The performance assessment criteria of control system AGC, the rate of unit varying duty need to reach the requirement of power grid, unit most of load section not
Obtaining does not make main steam control valve be in biggish throttle, sacrifices part economy to guarantee load respective capabilities and primary tune
Frequency ability.To coordinate the economy of fired power generating unit middle-low load section operation and the contradiction of power grid demand, auxiliary power regulation technology
As scientific research personnel's focus of attention.In addition, all trades and professions propose the reliability and power quality of power supply higher
Continue to greatly develop it is required that this does not require nothing more than power grid, and requires the horizontal upper new step of electric energy adjustment.In order to improve electricity
Net frequency quality, each bulk power grid carry forward vigorously the application of generated output adjust automatically control technology, ACE (Area Control
Error) i.e. district control deviation be according to the current loads of power grid, power generation, by electricity, frequency etc., at each of each electricity power enterprise
Power adjust automatically is carried out between AGC unit, realizes rational dispatching by power grids, guarantees power grid security, stable operation.After ACE investment
It is required that generating set quick response load variations, but load instruction fluctuating range is big, when vibration frequency is high, to guarantee that unit is quick
Load variations are responded, steam turbine instruction can respond rapidly to, and steam turbine high-pressure governing valve rapid fluctuations, multiple power plant repeatedly occur thus to make
At tune porthole valve stem fracture accident.Easily causing pusher side main vapour pressure to fluctuate simultaneously, big, the overshoot time is long, under-voltage or On The Problem Of Overpressure
Seriously.
Summary of the invention
Object of the present invention is to overcome the shortcomings of above-mentioned prior art, providing one kind can be improved Turbo-generator Set adaptation on the net
The operation of load variations ability, reduction steam turbine and boiler is fluctuated, passing through for quickening load corresponding speed controls extracted steam from turbine
The method that amount realizes unit fast frequency hopping.
Generator group coordination and control system is to carry out comprehensive control using boiler and steam turbine as the entirety of a monoblock
Control system used when processed, when network load instruction P0 and generating set actual load PE is deviated, while to boiler
Controller, turbine controller issue signal, and turbine controller issues instruction PT, by adjusting " speed regulation valve of steam turbine "
Aperture adjusts steam turbine throttle flow, and then Load adjustment.Boiler controller issues instruction PB to " the combustion rate adjusting machine of boiler
Structure ", by adjusting equipment coal-supplying amount, air quantity, confluent etc., to adjust the load of boiler.Entire adjustment process closed loop control, directly
It is equal with network load instruction P0 to actual load PE.Boiler controller and turbine controller pass through internal processes operation, obtain
The instruction of boiler firing optimization amount and speed regulation valve of steam turbine aperture amount out, i.e. boiler and steam turbine instruction, by electric signal come order
Boiler combustion and steam turbine pitch make switch adjustment.
The method of the present invention is: when both unit actual load PE and network load instruction P0 are deviated, controlling computer
Other than issuing electric signal to boiler controller, turbine controller, steam extraction is adjusted while being controlled, is adjusted and is controlled by steam extraction
Instruction PC come adjust height add porthole and it is low add porthole switching value, boiler instruction is issued by boiler controller and turbine controller
PB, steam turbine instruct PT, go control boiler combustion adjustment amount, steam turbine throttle aperture amount, three aspect closed-loop controls to reality
Load PE is equal with network load instruction P0.
When actual load PE and power grid instruction P0 are deviated, control is adjusted to steam extraction first and issues instruction PC, this refers to
Enable be control valve opening degree an electric signal, by height add porthole aperture and it is low add porthole aperture and change cause
The variation of steam extraction amount then influences generation load variation；If network load instructs P0 and actual load PE deviation less than 5%,
The variation of steam extraction amount meets load adjustment.At this moment boiler controller and turbine controller do not have to participate in frequency modulation.When network load refers to
When P0 and actual load PE being enabled to deviate larger (being greater than 5%), the variation of steam extraction amount is not able to satisfy load adjustment, continues to boiler
Controller, turbine controller issue signal, and turbine controller issues instruction PT, by adjusting the aperture of speed regulation valve of steam turbine,
Adjust steam turbine throttle flow, and then Load adjustment；Boiler controller issues instruction PB, by control adjustment coal feeder of boiler, send
The equipment such as blower, feed pump coal-supplying amount, air quantity, confluent etc. adjust the load of boiler, until actual load PE and network load
Instruct P0 equal.
Test result shows: steam extraction control tuning range 350MW grade units be within 5% it is preferable；If it is heat supply machine
Group, increases heat supply steam extraction adjustment, and tuning range rises to 7% or so.For other units due to differences such as capacity, tuning range can
It can change, but distinguish less, fluctuation is in 10-15% or so up and down.
In general, thermal power generation unit conventional control is three high-pressure heaters and three low-pressure heaters.Steam extraction adjustment
Control instruction PC is provided by the original control system of boiler, is increased without any equipment and device.
The load of Turbo-generator Set is mainly to be determined by throttle flow, and the aperture of usual " speed regulation valve of steam turbine " determines
The size of throttle flow, Steam Turhine Adjustment load are realized by throttle instruction, and extraction flow of steam is without adjusting
It is whole.If changing the aperture of " height adds valve ", " low to add porthole " by instruction, the quantity of steam extracted out inside steam turbine
It changes, turbine LP rotors load may also change accordingly.
The present invention can be improved Turbo-generator Set and adapt to online load variations ability, reduce the operation wave of steam turbine and boiler
It is dynamic, accelerate load corresponding speed.Under ACE state, after increasing the control feedforward of steam extraction amount, steam extraction is leaned in the fluctuation of load small degree completely
Amount is adjusted, and unit tune porthole state aperture is constant, has prevented pitch because of related accidents caused by switching frequently；Since steam extraction changes
Amount instantaneous conversion is load variable quantity, and in a certain range, load responding is fast；Under AGC, ACE mode, boiler combustion adjustment amount
Small, machine furnace system operation stability is high；Machine furnace system revamping workload is small, is throttled and is tested by steam extraction amount, on former coordinated control basis
Upper increase relevant control, scheme brief and practical.
Detailed description of the invention
Fig. 1 is that steam extraction of the present invention adjusts control mode flow chart；
Fig. 2 is the variation relation curve graph of 350MW unit steam extraction amount variation and load；
In figure: 1. boiler combustion rate regulating mechanisms, 2. steam turbines adjust door into vapour, and 3. (height) low-pressure heaters are adjusted into vapour
Door, 4. generators, 5. computing elements, 6. load signals, 7. power grids need load signal；P0 is network load instruction；PE is machine
Group actual load；PC is to control to issue instruction to steam extraction；PB is to issue to instruct to boiler；PT is to issue to instruct to steam turbine.
Specific embodiment
Boiler combustion rate regulating mechanism 1 by adjusting the coal-supplying amount of feeder, the air quantity of pressure fan, feed pump confluent
Deng to adjust the combustion intensity of boiler；Steam turbine adjusts the throttle flow that door 2 increases or decreases steam turbine by switching into vapour,
Adjust the load of steam turbine；Steam turbine is commonly configured with three sections of steam extractions to three high-pressure heaters, have three sections of steam extractions to three it is low
Heater is pressed, there are six (height) low-pressure heaters into vapour adjusting door 3 so total；Computing element 5 calculates the difference of P0 and PE, send
An electric signal is to boiler controller and turbine controller out；The current loads that Turbo-generator Set issues pass through load signal
6 are transmitted to computing element 5；Power grid needs load signal 7 to be transmitted to computing element 5.It is controlled to steam extraction and issues instruction PC, control includes pair
Turbine high-pressure heater is into porthole and low-pressure heater into the control of porthole aperture.
Preceding steam turbine and generator 4 issue certain load and send to power grid, send current institute's band real to calculator 5 by element 6
Border load PE, while power grid unit load instruction P0 sends computing element 5 to by 7, computing element 5 calculate current PE and P0
Then difference sends out an electric signal and issues extraction regulation instruction PC, PC controls turbine high-pressure heater into porthole and low pressure
Heater is adjusted into porthole aperture, and the load PE that at this moment steam turbine issues changes, and computing element 5 continues to calculate adjustment
The difference of PE and P0 afterwards, such as equal, then this adjustment process finishes, such as unequal, then computing element 5 continues to " boiler
Controller ", " turbine controller " issue signal, and turbine controller issues instruction PT, by adjusting opening for speed regulation valve of steam turbine 2
Degree adjusts steam turbine throttle flow, carrys out Load adjustment.Boiler controller issues instruction PB to the combustion rate regulating mechanism 1 of boiler, leads to
Toning finishing equipment coal-supplying amount, air quantity, confluent etc., to adjust the load of boiler, the load PE that steam turbine issues immediately becomes
Change, computing element 5 continues to calculate the difference of PE and P0 adjusted, makes continuing to adjust still adjusting the order finished, above
Whole flow process closed-loop control, until actual load PE is equal with network load instruction P0.
When unit needs to quickly increase load, reduces height heater into the aperture of porthole, throttle and enter what height added
Steam extraction, this part steam extraction return to steam turbine acting, and unit load moment rises.Conversely, adjusting door, moment drop by opening steam extraction
Low unit load；Quickly meet to load variations requirement.
By 300MW level steam turbine operation test, porthole aperture variation 10% is just added, moment about influences load 2-
3%.Load adjustment rate of the present invention is fast, and can be failure to actuate in unit tune porthole, on the basis of boiler combustion is unregulated, realizes fast
Fast lifting load.
When using the present invention program, need height plus extraction line increase extraction regulation door (such as original system for adjustment door
Transformation can not be had to)；By operation test, Coordinated Control Systems increase steam extraction control feedforward, and control amount is according to test result
It is reasonably adjusted, to achieve the purpose that accurately and quickly to control load；High low plus hydrophobic adjustment door carries out respective reaction speed
Adjustment, to guarantee when steam extraction amount is adjusted, height plus water level control are in normal fluctuation range；Condenser, oxygen-eliminating device water
Position control adjusts accordingly, and during guaranteeing that steam extraction amount is adjusted, condenser, deaerator level are rationally controlled；As supplied
Heat engine group can increase heat supply steam extraction adjustment control, and carry out corresponding operation test and combustion adjustment work.
By taking 350MW supercritical unit as an example: under declared working condition, main steam flow 1050t/h, height adds oxygen-eliminating device into vapour
Parameter is as follows:
| Steam extraction position | Pressure (MPa) | Temperature (DEG C) | Flow (kg/h) | Load name |
| After 11 grades of high pressure | 6.314 | 362.4 | 60536 | #1 high adds |
| After 14 grades of high pressure (high steam discharge) | 4.447 | 318.5 | 80524 | #2 high adds |
| After middle 4 grades of pressure | 2.301 | 480.0 | 52157 | #3 high adds |
| After middle 9 grades of pressure | 0.900 | 346.0 | 29590 | Oxygen-eliminating device |
| After middle 11 grades of pressure | 0.547 | 283.5 | 39359 | #5 is low to be added |
| After 2 grades of low pressure | 0.247 | 203.0 | 43156 | #6 is low to be added |
| After 4 grades of low pressure | 0.083 | 101.1 | 53727 | #7 is low to be added |
The above three-level height adds steam extraction amount to amount to 193t, when three-level height adds steam extraction to participate in adjustment control, every grade of steam extraction amount throttling
When, load change amount is as follows:
When three-level is low plus, three-level height add and simultaneously participate in adjustment control, when every grade of steam extraction amount throttling, load change amount is as follows
Table:
Upper table can be seen that, after height plus steam extraction participate in load control system, the instantaneous variation of load can from 7MW to 76MW load,
The load adjustment under unit ACE state is fully met, while unit tune porthole and boiler combustion do not have to fluctuation.Thermal power plant unit is as increased
Heat supply steam extraction is added to adjust, the range of load control system can be extended to 100MW or more.
Changed with the variation relation curve of load referring to fig. 2 by the 350MW unit steam extraction amount that test data obtains.Steam extraction amount
Relationship with load is calculated by main steam flow variation and the proportional relationship of load variations, in combination with actual motion master
The relationship of steam flow amount and load, and the data obtained.Load under actual operating mode also with unit back pressuce, main steam reheating
The variation such as steam pressure temperature is related.
Claims (4)
1. a kind of method for realizing unit fast frequency hopping by control extraction flow of steam, it is characterized in that in unit actual load PE
When instructing both P0 to deviate with network load, control computer is issuing the same of instruction to boiler controller, turbine controller
When to steam extraction adjustment control, by steam extraction adjust control instruction PC come adjust height add porthole and it is low add porthole switch
Amount issues boiler instruction PB, steam turbine instruction PT by boiler controller and turbine controller to control boiler combustion adjustment amount, steam turbine
Throttle aperture amount, three aspect closed-loop controls are equal with network load instruction P0 to actual load PE.
2. the method as described in claim 1 for realizing unit fast frequency hopping by control extraction flow of steam, it is characterized in that real
When border load PE and power grid instruction P0 are deviated, control is adjusted to steam extraction first and issues instruction PC, control valve opening degree leads to
It is excessively high add porthole aperture and it is low add porthole aperture change cause steam extraction amount variation come influence generation load variation；Such as electricity
Less than 5%, the variation of steam extraction amount meets load adjustment for net load instruction P0 and actual load PE deviation；Boiler controller and steam turbine
Controller is not involved in frequency modulation；When network load instruction P0 and actual load PE is deviated greater than 5%, the variation of steam extraction amount cannot
Meet load adjustment, need to continue to issue boiler controller, turbine controller signal, turbine controller issues instruction PT, passes through
The aperture and steam turbine throttle flow for adjusting speed regulation valve of steam turbine carry out Load adjustment；Boiler controller issues instruction PB, passes through control
System adjusts coal feeder of boiler, pressure fan, water supply pumping unit coal-supplying amount, air quantity, confluent to adjust the load of boiler, until actual negative
Lotus PE is equal with network load instruction P0.
3. the method as claimed in claim 1 or 2 that unit fast frequency hopping is realized by control extraction flow of steam, it is characterized in that
350MW grades of unit steam extractions control tuning ranges within 5% more preferably.
4. the method as claimed in claim 1 or 2 that unit fast frequency hopping is realized by control extraction flow of steam, it is characterized in that
Heat supply steam extraction adjusting range can be increased to 7% for thermal power plant unit.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110778368A (en) * | 2019-11-11 | 2020-02-11 | 中国神华能源股份有限公司国华电力分公司 | Frequency modulation method and device for steam turbine generator unit |
| CN111255530A (en) * | 2020-03-19 | 2020-06-09 | 西安热工研究院有限公司 | Thermal power generating unit load adjusting system and method assisted by butterfly valve with low-pressure cylinder |
| CN112503567A (en) * | 2020-11-24 | 2021-03-16 | 北方魏家峁煤电有限责任公司 | Feedforward coefficient determining method and device for boiler master control instruction |
| CN115622085A (en) * | 2022-11-21 | 2023-01-17 | 西安热工研究院有限公司 | Economic frequency modulation method, device, equipment and medium based on energy storage capacity of unit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110778368A (en) * | 2019-11-11 | 2020-02-11 | 中国神华能源股份有限公司国华电力分公司 | Frequency modulation method and device for steam turbine generator unit |
| CN111255530A (en) * | 2020-03-19 | 2020-06-09 | 西安热工研究院有限公司 | Thermal power generating unit load adjusting system and method assisted by butterfly valve with low-pressure cylinder |
| CN111255530B (en) * | 2020-03-19 | 2024-02-02 | 西安热工研究院有限公司 | Thermal power unit load adjusting system and method with low-pressure cylinder butterfly valve assistance |
| CN112503567A (en) * | 2020-11-24 | 2021-03-16 | 北方魏家峁煤电有限责任公司 | Feedforward coefficient determining method and device for boiler master control instruction |
| CN112503567B (en) * | 2020-11-24 | 2022-10-28 | 北方魏家峁煤电有限责任公司 | Feedforward coefficient determining method and device for boiler master control instruction |
| CN115622085A (en) * | 2022-11-21 | 2023-01-17 | 西安热工研究院有限公司 | Economic frequency modulation method, device, equipment and medium based on energy storage capacity of unit |
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