CN109882251A - Air-cooled high back pressure thermal power plant unit controls back pressure frequency modulation system and adjusting method in short-term - Google Patents
Air-cooled high back pressure thermal power plant unit controls back pressure frequency modulation system and adjusting method in short-term Download PDFInfo
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Abstract
The present invention provides a kind of air-cooled high back pressure thermal power plant unit control back pressure frequency modulation system and adjusting method in short-term, and frequency modulation system is made of the air Cooling and heat supply unit control back pressure generating set, turbine low pressure cylinder, each branch column regulating valve of Air-Cooling Island, Air-Cooling Island fan, scattered control system, the air-cooled back pressure correction amount control logic of frequency modulation and control device in short-term.The back pressure that unit is controlled by the short time participates in thermal power generation unit primary frequency modulation using heat supply network and controls, so that primary frequency modulation control mode diversification.And provide the frequency modulation system FM Function, back pressure frequency modulation frequency difference processing functional arrangement, frequency modulation system control logic block diagram.The control back pressure frequency modulation system and method can increase air Cooling and heat supply unit frequency modulation means through the invention, by the existing scattered control system coordinated control system of unit, realization easy to transform, and unit ontology is transformed small, control and debugging process are simple, are convenient for Project Realization.
Description
Technical field
The present invention relates to the control fields of thermal power plant unit, control back pressure more particularly, to a kind of air-cooled high back pressure thermal power plant unit
Frequency modulation system and adjusting method in short-term.
Background technique
With the fast development that the new energy such as UHV transmission and wind-powered electricity generation, solar energy are built, regional power grid structure becomes
It becomes increasingly complex, the safe and stable operation technical requirements of power grid are also higher and higher.It is well known that wind-powered electricity generation, solar energy etc. are new
The predictability of energy power generation is relatively poor, and the peak load of wind-power electricity generation is mostly present in the trough of electricity consumption, simultaneously
The controllability of generation of electricity by new energy is also relatively poor, and primary frequency modulation contributes ability limited, for the adjustment of power grid, the new energy such as wind-powered electricity generation
The grid-connected load in source is higher, and power grid frequency modulation is more difficult to.Primary frequency modulation is the important means that grid company maintains mains frequency stable.For
Power grid safe and stable, economical operation and power quality is improved, grid company requires online thermal power generation unit necessary
Have primary frequency function, and proposes specific technical indicator and evaluation method.Fired power generating unit primary frequency function is steamer
The intrinsic function of generating set, it is main by adjusting occurring in power grid different into vapour adjusting door using boiler heat storage for DEH system
In the case where often, the requirement of quick response power grid, electric power grid frequency stabilization maintains the safety of power grid to make up network load gap.
The primary frequency modulation design of major part thermal power generation unit combines frequency modulation control scheme using DEH+DCS at present, utilizes
Frequency modulation instruction in the side DEH is directly superimposed in unit main vapour valve control instruction, realizes the rapidity of primary frequency modulation movement, guarantees electricity
When net frequency fluctuation, generating set can quickly increase and decrease power output, and load needed for compensating power grid frequency modulation utilizes the side DCS control program
Guarantee that unit primary frequency modulation compensation magnitude, the two cooperate, promotes the primary frequency modulation performance of unit.
Air-cooled high back pressure thermal power plant unit biggish for the thermal power generation unit of heat supply, especially thermic load, although power generation
Machine load is not up to rated load, but steam turbine throttle flow has reached rated steam inlet amount, if carrying out frequency modulation under this operating condition, and
And when being needed according to frequency modulation toward up-regulation load, existing primary frequency modulation means for frequency modulation quick response by big heavy discount.
Application number: CN201611101417.2 Chinese invention patent discloses a kind of dum boiler fired power generating unit primary frequency modulation
Optimization method is controlled, which can be used for primary frequency modulation of the dum boiler fired power generating unit in actual moving process and automatically controls,
Guarantee unit in the process of running, automatically in the reasonable scope by primary frequency modulation load control system.It is included in dum boiler thermal motor
Increase primary frequency modulation boiler master feedforward correction amount control logic, primary in the control logic configuration of group distributed monitoring control system
Frequency modulation turbine main control feedforward correction amount control logic, the control of primary frequency modulation digital electro-hydraulic control system DEH correction factor
Logic, primary frequency modulation extraction flow of steam correction amount control logic.The invention can reduce operations staff's labor intensity, and control effect
Technical level of the fruit independent of operations staff.Pass through existing unit distributed monitoring control system coordinated control system, real-time
Good, field adjustable process is simple, is convenient for Project Realization.There is provided a kind of dum boiler fired power generating unit primary frequency modulation controls for the invention
Optimization method processed, but do not use and adjust the method for air-cooled heat supply back pressure to carry out frequency modulation.
Application number: it is primary to power station that CN201710398438.3 Chinese invention patent discloses energy-storage system in a kind of power station
The response method and system of frequency modulation, the response method specifically includes the following steps: monitor mains frequency and power station frequency simultaneously,
When issuing primary frequency modulation action command in power station, diagnosis primary frequency modulation action command issues reason, and issues control instruction；Sentence
The priority of disconnected control instruction issues control signal to energy-storage system according to priority level.The invention can be joined in energy-storage system
During primary frequency modulation, the influence of energy-storage system load is considered, so that primary frequency modulation controls more accurate, energy storage system
System movement is more reasonable, provides reliable guarantee for the stable operation of power grid.The patent is carried out by energy-storage system in power station
Primary frequency modulation, there is no carry out frequency modulation using the means for adjusting air-cooled heat supply back pressure.
To sum up, following problems exist in the prior art:
1, primary frequency modulation means are single: at present thermal power generation unit primary frequency modulation be mainly pass through adjust DEH system into
Vapour adjusts door, using boiler heat storage, in the case where there is exception in power grid, and the requirement of quick response power grid, electric power grid frequency stabilization,
To make up network load gap, the safety of power grid is maintained；
2, for undertaking the thermal power plant unit compared with high heat load, current mode of frequency regulation frequency modulation compensation magnitude is poor, for heat supply
Thermal power generation unit, the especially biggish unit of thermic load, although generator load is not up to rated load, steam turbine into
Vapour amount has reached rated steam inlet amount, if frequency modulation is carried out under secondary operating condition, and according to frequency modulation need toward up-regulation load when, it is existing
Primary frequency modulation mode frequency modulation compensation magnitude is limited.
3, other frequency modulation means improvement expenses are higher, and frequency regulation capacity is limited, have part firepower unit to attempt to utilize storage in the recent period
Can equipment participate in primary frequency modulation, but energy storage device cost is high causes to be transformed that initial cost is larger, and frequency regulation capacity is limited.
Summary of the invention
In order to overcome the shortcomings of the prior art described above, it is short a kind of air-cooled high back pressure thermal power plant unit control back pressure has been invented
When frequency modulation system and provide present system configuration and transformation after runing adjustment method.The system mainly includes steam turbine low-pressure
Cylinder 101, generator 102, steam exhaust device 103, mesolow liaison tube heat supply regulating butterfly valve 104, Air-Cooling Island branch column regulating butterfly valve
105,106, Air-Cooling Island fan 107, distributed monitoring control system, frequency modulation air cooling unit back pressure correction amount control of Air-Cooling Island heat dissipation tube bank
Logic processed and control device；
Wherein turbine low pressure cylinder 101, generator 102, steam exhaust device 103, mesolow liaison tube heat supply regulating butterfly valve
104, the company of Air-Cooling Island branch column regulating butterfly valve 105, Air-Cooling Island heat dissipation tube bank 106, Air-Cooling Island fan 107, distributed monitoring control system
It is as follows to connect relationship: contact pipeline of the mesolow liaison tube heat supply regulating butterfly valve 104 between Steam Turbine Through IP Admission and low pressure (LP) cylinder 101
On, turbine low pressure cylinder 101 is that a part of drawing generator 102 of steam turbine generates electricity, and it is low that steam exhaust device 103 is arranged in steam turbine
101 lower part of cylinder pressure, the turbine discharge into steam exhaust device 103 are dissipated by Air-Cooling Island branch column regulating butterfly valve 105 into Air-Cooling Island
Heat pipe bundle 106, below Air-Cooling Island heat dissipation tube bank 106, control air velocity radiates to Air-Cooling Island restrains Air-Cooling Island fan 107
Turbine discharge is cooled down in 106, and distributed monitoring control system controls above system；
Wherein the control mode of 107 scattered control system of Air-Cooling Island branch column regulating butterfly valve 105 and Air-Cooling Island fan passes through fast
Speed switch Air-Cooling Island branch column regulating butterfly valve 105 is realized, 107 revolving speed of Air-Cooling Island fan is quickly adjusted, so that air cooling system participates in
Meet response time requirement when frequency modulation；
Increase the air-cooled back pressure of frequency modulation in the control logic configuration of air-cooled high back pressure thermal power plant unit distributed monitoring control system to repair
Positive quantity control logic makes unit exhaust steam pressure participate in frequency modulation.
The present invention also provides a kind of controls of above-mentioned air-cooled high back pressure thermal power plant unit control back pressure frequency modulation system in short-term
Method includes that the air-cooled back pressure correction amount control logic of frequency modulation by the short time regulates and controls air-cooled back pressure frequency modulation system in the control method
FM Function, wherein being adapted to according to the variable quantity of the power of the assembling unit under influence of the air-cooled back pressure to unit load and fm role
The FM Function that short time regulates and controls air-cooled back pressure frequency modulation system is as follows:
F (Q)=k × △ f
In formula: f (Q) is FM Function；K is coefficient of frequency modulation；△ f is frequency modulation amplitude；△ P is steam turbine exhaust pressure variation
Amount；Q is turbine low pressure cylinder displacement；hpqChange enthalpy variable quantity for steam discharge under unit back pressure；δ is differing for generating unit speed
Rate；n0For Steam Turbine rated speed；pnFor the rated power of Steam Turbine.
The present invention also provides a kind of control methods, control back pressure frequency modulation in short-term including air-cooled high back pressure thermal power plant unit
The runing adjustment method of system, this method are as follows:
1) it transfers and judges power plant's frequency signal whether in Regulation dead-band, if frequency signal deviates 50Hz and dead in frequency modulation
Outside area, frequency modulation action command is issued at this time, into next step.
2) if power plant's frequency is greater than 50Hz, by frequency bias control instruction input to f (Q) FM Function, vapour is calculated
Turbine discharge amount of back pressure changing value △ P, provides air-cooled branch pipe isolating valve and air-cooled wind according to turbine discharge amount of back pressure variable quantity
Machine quickly closes instruction, if power plant's frequency enters in next step when being not more than 50Hz.
If 3) judgement power plant's frequency is not more than 50Hz, frequency bias control instruction input to f (Q) FM Function calculates
Turbine discharge amount of back pressure changing value △ P out, according to steam turbine arrange exhaust pressure amount variable quantity provide air-cooled branch pipe isolating valve and
Air cooling blower fan quickly opens instruction.
Using above-mentioned technical proposal, the present invention can solve following technical problem:
1, frequency modulation system of the present invention and adjusting method control air Cooling and heat supply unit by the short time and run back pressure, benefit
The control of thermal power generation unit primary frequency modulation is participated in heat supply network, so that primary frequency modulation control mode diversification.
2, control thermal power plant unit is adjusted by the short time and runs back pressure, in particular for compared with high heat load and steam turbine
The thermal power plant unit for having reached rated steam inlet amount can greatly improve unit load within a short period of time, make up by reducing back pressure
Primary frequency modulation increases the limited disadvantage of main vapour amount frequency modulation compensation magnitude in this case.
3, frequency modulation system transformation of the present invention only carries out necessary DCS logic transformation, and expense is relative to energy storage type frequency modulation
Mode is greatly reduced, and is convenient for Project Realization.
Compared with the existing technology, the present invention obtains following advantage:
1, frequency modulation system of the present invention and adjusting method are controlled air-cooled heat supply back pressure by the short time, are joined using heat supply network
It is controlled with thermal power generation unit primary frequency modulation, so that primary frequency modulation control mode diversification.
2, control heat supply back pressure is adjusted by the short time, in particular for compared with high heat load and steam turbine has reached
The thermal power plant unit of rated steam inlet amount can greatly improve unit load within a short period of time, make up in this case by reducing back pressure
Primary frequency modulation increases the limited disadvantage of main vapour amount frequency modulation compensation magnitude.
3, frequency modulation system transformation of the present invention only carries out necessary DCS logic transformation, and expense is relative to energy storage type frequency modulation
Mode is greatly reduced, and is convenient for Project Realization.
4, frequency modulation system technical implementation way of the present invention is to control heat supply back pressure in short-term different from existing any primary
Frequency modulation technology has unique novelty.
Detailed description of the invention
Fig. 1 is the schematic diagram of air-cooled high back pressure thermal power plant unit control back pressure of the invention frequency modulation system in short-term；
Fig. 2 is the control mode schematic diagram of air-cooled high back pressure thermal power plant unit control back pressure of the invention frequency modulation system in short-term；
Fig. 3 is the logic control schematic diagram of air-cooled high back pressure thermal power plant unit control back pressure of the invention frequency modulation system in short-term.
Specific embodiment
Next it will be made further explanation and description in conjunction with Fig. 1-3 pairs of the solution of the present invention.
Fig. 1 is the schematic diagram of air-cooled high back pressure thermal power plant unit control back pressure of the invention frequency modulation system in short-term, in which:
The present invention provides a kind of air-cooled high back pressure thermal power plant unit control back pressures frequency modulation system and to provide system of the present invention in short-term
It is under unified central planning set and be transformed after runing adjustment method.The system mainly includes turbine low pressure cylinder 101, generator 102, steam exhaust device
103, mesolow liaison tube heat supply regulating butterfly valve 104, Air-Cooling Island branch column regulating butterfly valve 105, Air-Cooling Island heat dissipation tube bank 106, it is air-cooled
Island fan 107, distributed monitoring control system, frequency modulation air cooling unit back pressure correction amount control logic and control device；
Wherein turbine low pressure cylinder 101, generator 102, steam exhaust device 103, mesolow liaison tube heat supply regulating butterfly valve
104, the company of Air-Cooling Island branch column regulating butterfly valve 105, Air-Cooling Island heat dissipation tube bank 106, Air-Cooling Island fan 107, distributed monitoring control system
It is as follows to connect relationship: contact pipeline of the mesolow liaison tube heat supply regulating butterfly valve 104 between Steam Turbine Through IP Admission and low pressure (LP) cylinder 101
On, turbine low pressure cylinder 101 is that a part of drawing generator 102 of steam turbine generates electricity, and it is low that steam exhaust device 103 is arranged in steam turbine
101 lower part of cylinder pressure, the turbine discharge into steam exhaust device 103 are dissipated by Air-Cooling Island branch column regulating butterfly valve 105 into Air-Cooling Island
Heat pipe bundle 106, below Air-Cooling Island heat dissipation tube bank 106, control air velocity radiates to Air-Cooling Island restrains Air-Cooling Island fan 107
Turbine discharge is cooled down in 106, and distributed monitoring control system controls above system；
Wherein the control mode of 107 scattered control system of Air-Cooling Island branch column regulating butterfly valve 105 and Air-Cooling Island fan passes through fast
Speed switch Air-Cooling Island branch column regulating butterfly valve 105 is realized, 107 revolving speed of Air-Cooling Island fan is quickly adjusted, so that air cooling system participates in
Meet response time requirement when frequency modulation；
Increase the air-cooled back pressure of frequency modulation in the control logic configuration of air-cooled high back pressure thermal power plant unit distributed monitoring control system to repair
Positive quantity control logic makes unit exhaust steam pressure participate in frequency modulation.
Fig. 2 is the control mode schematic diagram of air-cooled high back pressure thermal power plant unit control back pressure of the invention frequency modulation system in short-term,
Wherein:
The present invention also provides a kind of controls of above-mentioned air-cooled high back pressure thermal power plant unit control back pressure frequency modulation system in short-term
Method includes that the air-cooled back pressure correction amount control logic of frequency modulation by the short time regulates and controls air-cooled back pressure frequency modulation system in the control method
FM Function, wherein being adapted to according to the variable quantity of the power of the assembling unit under influence of the air-cooled back pressure to unit load and fm role
The FM Function that short time regulates and controls air-cooled back pressure frequency modulation system is as follows:
F (Q)=k × △ f
In formula: f (Q) is FM Function；K is coefficient of frequency modulation；△ f is frequency modulation amplitude；△ P is steam turbine exhaust pressure variation
Amount；Q is turbine low pressure cylinder displacement；hpqChange enthalpy variable quantity for steam discharge under unit back pressure；δ is differing for generating unit speed
Rate；n0For Steam Turbine rated speed；pnFor the rated power of Steam Turbine.
Fig. 3 is the logic control schematic diagram of air-cooled high back pressure thermal power plant unit control back pressure of the invention frequency modulation system in short-term.
With reference to Fig. 3, the present invention also provides a kind of control methods, control back pressure including air-cooled high back pressure thermal power plant unit
The runing adjustment method of frequency modulation system, this method are as follows in short-term:
1) it transfers and judges power plant's frequency signal whether in Regulation dead-band, if frequency signal deviates 50Hz and dead in frequency modulation
Outside area, frequency modulation action command is issued at this time, into next step.
2) if power plant's frequency is greater than 50Hz, by frequency bias control instruction input to f (Q) FM Function, vapour is calculated
Turbine discharge amount of back pressure changing value △ P, provides air-cooled branch pipe isolating valve and air-cooled wind according to turbine discharge amount of back pressure variable quantity
Machine quickly closes instruction, if power plant's frequency enters in next step when being not more than 50Hz.
If 3) judgement power plant's frequency is not more than 50Hz, frequency bias control instruction input to f (Q) FM Function calculates
Turbine discharge amount of back pressure changing value △ P out, according to steam turbine arrange exhaust pressure amount variable quantity provide air-cooled branch pipe isolating valve and
Air cooling blower fan quickly opens instruction.
The runing adjustment method of air-cooled high back pressure thermal power plant unit control back pressure of the present invention frequency modulation system in short-term:
1) it transfers and judges power plant's frequency signal whether in Regulation dead-band, if frequency signal deviates 50Hz and dead in frequency modulation
Outside area, frequency modulation action command is issued at this time, into next step.
2) if power plant's frequency is greater than 50Hz, by frequency bias control instruction input to f (P) FM Function, vapour is calculated
Turbine discharge amount of back pressure changing value △ P, provides air-cooled branch pipe isolating valve and air-cooled wind according to turbine discharge amount of back pressure variable quantity
Machine quickly closes instruction, if power plant's frequency enters in next step when being not more than 50Hz.
3) if judgement power plant's frequency is less than 50Hz and calculates frequency bias control instruction input to f (P) FM Function
Turbine discharge amount of back pressure changing value △ P arranges exhaust pressure amount variable quantity according to steam turbine and provides air-cooled branch pipe isolating valve and sky
Air-cooler quickly opens instruction.
Example explanation:
The overcritical air-cooled steam turbine generator group of 1 350MW of certain power plant, rated power 350MW, rated speed 3000rpm, machine
Group speed governor droop 5%.THA operating condition rated steam inlet amount 1056.4t/h, specified heat supply back pressure are 32KPa, specified supplying thermal condition machine
Group load 328.2MW needs the unit to increase load direction maximum frequency modulation load increment amplitude specified not less than 5% according to grid requirements
Power, if unit throttle flow has reached rated steam inlet amount when unit 32KPa back pressure heat supply, because the unit throttle flow has reached
To specified, increase the main vapour amount of 5% rated power, that is, 17.5MW burden requirement and increase above steam turbine rated steam inlet amount, then primary
The unit frequency modulation is unable to satisfy grid requirements and needs to be transformed in the frequency modulation permission response time.
According to air-cooled high back pressure thermal power plant unit control back pressure of the present invention, frequency modulation system and adjusting method are carried out in short-term
After corresponding system and logic transformation, the FM Function can calculate in short-term that exhaust pressure about 14.8kPa is i.e. according to the present invention
17.5MW can be met and increase burden requirement, and be not required to improve steam turbine throttle flow, the system reform of the present invention is simple, low cost,
It is easy to Project Realization.
It is as follows that back pressure short time frequency modulation system performance parameter is controlled after transformation:
| Serial number | Project | Unit | Numerical value |
| 1 | Frequency modulation back pressure ranges | kPa | 8~36 |
| 2 | Frequency modulation load range | MW | 0~33.3 |
| 3 | Frequency modulation amplitude | Hz | 0~0.234 |
| 4 | Response time | s | < 1.5 |
Using above-mentioned technical proposal, frequency modulation system of the present invention and adjusting method control air-cooled heat supply by the short time
Unit runs back pressure, participates in thermal power generation unit primary frequency modulation using heat supply network and controls, so that primary frequency modulation control mode is more
Sample.Adjust control thermal power plant unit by the short time and run back pressure, in particular for compared with high heat load and steam turbine
The thermal power plant unit for reaching rated steam inlet amount can greatly improve unit load within a short period of time, make up the feelings by reducing back pressure
Frequency modulation increases the limited disadvantage of main vapour amount frequency modulation compensation magnitude to condition next time.The frequency modulation system transformation only carries out necessary DCS
Logic transformation, expense are greatly reduced relative to energy storage type mode of frequency regulation, are convenient for Project Realization.
Compared with the existing technology, the present invention obtains following advantage:
1, frequency modulation system of the present invention and adjusting method are controlled air-cooled heat supply back pressure by the short time, are joined using heat supply network
It is controlled with thermal power generation unit primary frequency modulation, so that primary frequency modulation control mode diversification.
2, control heat supply back pressure is adjusted by the short time, in particular for compared with high heat load and steam turbine has reached
The thermal power plant unit of rated steam inlet amount can greatly improve unit load within a short period of time, make up in this case by reducing back pressure
Primary frequency modulation increases the limited disadvantage of main vapour amount frequency modulation compensation magnitude.
3, frequency modulation system transformation of the present invention only carries out necessary DCS logic transformation, and expense is relative to energy storage type frequency modulation
Mode is greatly reduced, and is convenient for Project Realization.
4, frequency modulation system technical implementation way of the present invention is to control heat supply back pressure in short-term different from existing any primary
Frequency modulation technology has unique novelty.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant, these change, modification, replacement and modification are also considered as protection model of the invention
It encloses.
Claims (3)
1. frequency modulation system, the system mainly include turbine low pressure cylinder to a kind of air-cooled high back pressure thermal power plant unit control back pressure in short-term
(101), generator (102), steam exhaust device (103), mesolow liaison tube heat supply regulating butterfly valve (104), Air-Cooling Island branch column are adjusted
Butterfly valve (105), Air-Cooling Island heat dissipation tube bank (106), Air-Cooling Island fan (107), scattered control system (DCS), frequency modulation air cooling unit
Back pressure correction amount control logic and control device；
Wherein turbine low pressure cylinder (101), generator (102), steam exhaust device (103), mesolow liaison tube heat supply regulating butterfly valve
(104), Air-Cooling Island branch column regulating butterfly valve (105), Air-Cooling Island heat dissipation tube bank (106), Air-Cooling Island fan (107), decentralised control system
The connection relationship of system (DCS) is as follows: mesolow liaison tube heat supply regulating butterfly valve (104) is in Steam Turbine Through IP Admission and low pressure (LP) cylinder
(101) on the contact pipeline between, turbine low pressure cylinder (101) is that a part of drawing generator (102) of steam turbine generates electricity, row
Vapour device (103) is arranged in turbine low pressure cylinder (101) lower part, into steam exhaust device (103) turbine discharge by air-cooled
Island branch column regulating butterfly valve (105) enters Air-Cooling Island heat dissipation tube bank (106), and Air-Cooling Island fan (107) radiates in Air-Cooling Island restrains
(106) lower section, control air velocity cool down Air-Cooling Island heat dissipation tube bank (106) interior turbine discharge, scattered control system
(DCS) above system is controlled；
Wherein the control mode of Air-Cooling Island branch column regulating butterfly valve (105) and Air-Cooling Island fan (107) scattered control system passes through fast
Speed switch Air-Cooling Island branch column regulating butterfly valve (105) is realized, Air-Cooling Island fan (107) revolving speed is quickly adjusted, so that air cooling system
It participates in meeting response time requirement when frequency modulation；
Increase the air-cooled back pressure amendment of frequency modulation in the control logic configuration of air-cooled high back pressure thermal power plant unit scattered control system (DCS)
Amount control logic makes unit exhaust steam pressure participate in frequency modulation.
2. a kind of controlling party of air-cooled high back pressure thermal power plant unit control back pressure according to claim 1 frequency modulation system in short-term
Method includes the tune that the air-cooled back pressure correction amount control logic of frequency modulation is regulated and controled air-cooled back pressure frequency modulation system by the short time in the control method
Frequency function, wherein being adapted to short according to the variable quantity of the power of the assembling unit under influence of the air-cooled back pressure to unit load and fm role
The FM Function of the air-cooled back pressure frequency modulation system of time-controllable is as follows:
F (Q)=k × △ f
In formula: f (Q) is FM Function；K is coefficient of frequency modulation；△ f is frequency modulation amplitude；△ P is steam turbine exhaust pressure variable quantity；Q
For turbine low pressure cylinder displacement；hpqChange enthalpy variable quantity for steam discharge under unit back pressure；δ is the diversity factor of generating unit speed；n0
For Steam Turbine rated speed；pnFor the rated power of Steam Turbine.
3. control method according to claim 2 controls back pressure frequency modulation in short-term including air-cooled high back pressure thermal power plant unit
The runing adjustment method of system, this method are as follows:
1) it transfers and judges power plant's frequency signal whether in Regulation dead-band, if frequency signal deviates 50Hz and in Regulation dead-band
Outside, frequency modulation action command is issued at this time, into next step.
2) if power plant's frequency is greater than 50Hz, by frequency bias control instruction input to f (Q) FM Function, steam turbine is calculated
Exhaust pressure amount changing value △ P, provides air-cooled branch pipe isolating valve according to turbine discharge amount of back pressure variable quantity and air cooling blower fan is fast
Fast Guan Zhiling, if power plant's frequency enters in next step when being not more than 50Hz.
3) if frequency bias control instruction input to f (Q) FM Function is calculated vapour no more than 50Hz by judgement power plant's frequency
Turbine discharge amount of back pressure changing value △ P arranges exhaust pressure amount variable quantity according to steam turbine and provides air-cooled branch pipe isolating valve and air-cooled
Blower quickly opens instruction.
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