CN109915216A - A kind of thermal power plant unit control steam extraction frequency modulation system and adjusting method in short-term - Google Patents
A kind of thermal power plant unit control steam extraction frequency modulation system and adjusting method in short-term Download PDFInfo
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Abstract
The present invention provides a kind of thermal power plant unit control steam extraction frequency modulation system and adjusting method in short-term, and frequency modulation system is mainly made of generating set, steam turbine high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, the quick regulating butterfly valve of mesolow contact pipeline, scattered control system, frequency modulation heat supply steam extraction correction amount control logic and control device in short-term for the thermal power plant unit control steam extraction.Heat supply steam extraction amount is controlled by the short time, thermal power generation unit primary frequency modulation is participated in using heat supply network and controls, so that the diversification of primary frequency modulation control mode, and the shortcomings that make up high heat load thermal power plant unit current frequency modulation means.And provide the frequency modulation system FM Function, steam extraction frequency modulation frequency difference processing functional arrangement, frequency modulation system control logic block diagram.The steam extraction frequency modulation system and adjusting method can increase thermal power plant 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 a kind of thermal power plant unit fields, control steam extraction frequency modulation system in short-term more particularly, to a kind of thermal power plant unit
With adjusting method.
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.
Unit biggish for the thermal power generation unit of heat supply, especially thermic load, although generator load is not up to volume
Constant load, but steam turbine throttle flow has reached rated steam inlet amount, if carrying out frequency modulation under secondary operating condition, and according to frequency modulation needs
When 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 the adjustment of heat supply steam extraction 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 carries out frequency modulation there is no the means using adjustment heat supply steam extraction.
To sum up, following technical problem exists 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, a kind of thermal power plant unit control steam extraction frequency modulation system in short-term has been invented
And provide runing adjustment method after present system configuration and transformation.
Wherein, the configuration of the system mainly includes steam turbine high-pressure cylinder 101, Steam Turbine Through IP Admission 102, steam turbine low-pressure
Cylinder 103, generator 104, condenser 105, the quick regulating butterfly valve 106 of mesolow contact pipeline, heat supply extraction stop valve 107,
Distributed monitoring control system, frequency modulation heat supply steam extraction correction amount control logic and control device；
Wherein 103 driven generator 104 of steam turbine high-pressure cylinder 101, Steam Turbine Through IP Admission 102 and turbine low pressure cylinder；
Main steam 201, which enters after steam turbine high-pressure cylinder 101 does work, enters boiler reheater, and reheated steam 202 enters steamer
Machine intermediate pressure cylinder 102 enters vapour after getting in touch with the quick regulating butterfly valve 106 of pipeline by the mesolow on mesolow liaison tube after doing work
The acting driven generator 104 of turbine low pressure (LP) cylinder 103, drains into condenser 105 in the steam that turbine low pressure cylinder 103 finishes function, uses
It is connected to mesolow liaison tube in middle row's heat supply steam extraction 203 of heat supply, interface gets in touch with the quick regulating butterfly valve 106 of pipeline in mesolow
Before, heat supply extraction stop valve 107 is installed, distributed monitoring control system controls power generation in systems on middle row's heat supply extraction line
Machine 104；
It is characterized by: distributed monitoring control system also controls the mesolow contact quick regulating butterfly valve 106 of pipeline, it is described
The mesolow contact quick regulating butterfly valve 106 of pipeline is connected to the liaison tube of Steam Turbine Through IP Admission 102 and turbine low pressure cylinder 103
On, to meet response time requirement when participating in frequency modulation；
Wherein increase frequency modulation heat supply steam extraction correction amount in the control logic configuration of the distributed monitoring control system of thermal power plant unit
Control logic, which to arrange steam extraction in unit, participates in frequency modulation, and frequency modulation heat supply steam extraction correction amount control logic is by steam extraction frequency modulation system in short-term
FM Function and steam extraction in short-term frequency modulation system runing adjustment method form；
The control method, the FM Function including being adapted to short time regulation heat supply steam extraction frequency modulation system, the frequency modulation letter
Number 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；△ Q is that steam extraction quantitative change is arranged in steam turbine
Change value；hzpFor Steam Turbine Through IP Admission steam discharge enthalpy；hdpFor exhaust enthalpy of low pressure cylinder of steam turbine value；δ is the diversity factor of generating unit speed；n0
For Steam Turbine rated speed；pnFor the rated power of Steam Turbine.
Control method according to the present invention, in which:
The runing adjustment method of thermal power plant unit control steam extraction frequency modulation system in short-term is 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
Steam extraction amount changing value △ Q is arranged in turbine, and mesolow contact pipeline is provided according to row's steam extraction amount changing value in steam turbine and is quickly adjusted
The instruction of butterfly valve open-width degree is saved, 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 (Q) FM Function
Steam extraction amount changing value △ Q is arranged in steam turbine, it is quick to provide mesolow contact pipeline according to row's steam extraction amount changing value in steam turbine
Regulating butterfly valve closes amplitude instruction.
The present invention provides thermal power plant unit control steam extraction, frequency modulation system, the system apply above-mentioned control method in short-term.
By can solve following technical problem using above-mentioned technical proposal:
1, frequency modulation system of the present invention and adjusting method are controlled heat supply steam extraction amount by the short time, are participated in using heat supply network
Thermal power generation unit primary frequency modulation control, so that primary frequency modulation control mode diversification.
2, control heat supply steam extraction amount is adjusted by the short time, in particular for compared with high heat load and steam turbine has reached
Unit load can be greatly improved within a short period of time, makes up the situation by reducing steam extraction to the thermal power plant unit of rated steam inlet amount
Frequency modulation increases the limited disadvantage of main vapour amount frequency modulation compensation magnitude next time.
3, frequency modulation system transformation of the present invention only needs to change mesolow communicating pipe heat supply butterfly valve and necessary DCS is patrolled
Transformation is collected, expense is greatly reduced relative to energy storage type mode of frequency regulation, is convenient for Project Realization.
It can be achieved the advantages that using above-mentioned technical proposal
1, frequency modulation system of the present invention and adjusting method are controlled heat supply steam extraction amount by the short time, are participated in using heat supply network
Thermal power generation unit primary frequency modulation control, so that primary frequency modulation control mode diversification.
2, control heat supply steam extraction amount is adjusted by the short time, in particular for compared with high heat load and steam turbine has reached
Unit load can be greatly improved within a short period of time, makes up the situation by reducing steam extraction to the thermal power plant unit of rated steam inlet amount
Frequency modulation increases the limited disadvantage of main vapour amount frequency modulation compensation magnitude next time.
3, frequency modulation system transformation of the present invention only needs to change mesolow communicating pipe heat supply butterfly valve and necessary DCS is patrolled
Transformation is collected, expense is greatly reduced relative to energy storage type mode of frequency regulation, is convenient for Project Realization.
4, frequency modulation system technical implementation way of the present invention is that control heat supply steam extraction amount is different from existing any one in short-term
Secondary frequency modulation technology has unique novelty.
Detailed description of the invention
Fig. 1 is the schematic diagram of thermal power plant unit control steam extraction of the invention frequency modulation system in short-term；
Fig. 2 is the control mode schematic diagram of thermal power plant unit control steam extraction of the invention frequency modulation system in short-term；
Fig. 3 is the logic control schematic diagram of thermal power plant unit control steam extraction of the invention frequency modulation system in short-term.
Specific embodiment
Next, Fig. 1-3 of the invention couples of present invention of reference to be explained in detail and describe.
With reference to Fig. 1, the present invention provides a kind of thermal power plant unit control steam extractions frequency modulation system and to provide present system in short-term
Runing adjustment method after configuration and transformation.
Wherein, the configuration of the system mainly includes steam turbine high-pressure cylinder 101, Steam Turbine Through IP Admission 102, steam turbine low-pressure
Cylinder 103, generator 104, condenser 105, the quick regulating butterfly valve 106 of mesolow contact pipeline, heat supply extraction stop valve 107,
Distributed monitoring control system, frequency modulation heat supply steam extraction correction amount control logic and control device；
Wherein 103 driven generator 104 of steam turbine high-pressure cylinder 101, Steam Turbine Through IP Admission 102 and turbine low pressure cylinder；
Main steam 201, which enters after steam turbine high-pressure cylinder 101 does work, enters boiler reheater, and reheated steam 202 enters steamer
Machine intermediate pressure cylinder 102 enters vapour after getting in touch with the quick regulating butterfly valve 106 of pipeline by the mesolow on mesolow liaison tube after doing work
The acting driven generator 104 of turbine low pressure (LP) cylinder 103, drains into condenser 105 in the steam that turbine low pressure cylinder 103 finishes function, uses
It is connected to mesolow liaison tube in middle row's heat supply steam extraction 203 of heat supply, interface gets in touch with the quick regulating butterfly valve 106 of pipeline in mesolow
Before, heat supply extraction stop valve 107 is installed, distributed monitoring control system controls power generation in systems on middle row's heat supply extraction line
Machine 104；
It is characterized by: distributed monitoring control system also controls the mesolow contact quick regulating butterfly valve 106 of pipeline, it is described
The mesolow contact quick regulating butterfly valve 106 of pipeline is connected to the liaison tube of Steam Turbine Through IP Admission 102 and turbine low pressure cylinder 103
On, to meet response time requirement when participating in frequency modulation；
With reference to Fig. 2, control mode of the invention is as follows:
Wherein increase frequency modulation heat supply steam extraction correction amount in the control logic configuration of the distributed monitoring control system of thermal power plant unit
Control logic, which to arrange steam extraction in unit, participates in frequency modulation, and frequency modulation heat supply steam extraction correction amount control logic is by steam extraction frequency modulation system in short-term
FM Function and steam extraction in short-term frequency modulation system runing adjustment method form；
The control method, the FM Function including being adapted to short time regulation heat supply steam extraction frequency modulation system, the frequency modulation letter
Number 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；△ Q is that steam extraction quantitative change is arranged in steam turbine
Change value；hzpFor Steam Turbine Through IP Admission steam discharge enthalpy；hdpFor exhaust enthalpy of low pressure cylinder of steam turbine value；δ is the diversity factor of generating unit speed；n0
For Steam Turbine rated speed；pnFor the rated power of Steam Turbine.
With reference to Fig. 3, the runing adjustment method of thermal power plant unit control steam extraction frequency modulation system in short-term is 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
Steam extraction amount changing value △ Q is arranged in turbine, and mesolow contact pipeline is provided according to row's steam extraction amount changing value in steam turbine and is quickly adjusted
The instruction of butterfly valve open-width degree is saved, 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 (Q) FM Function
Steam extraction amount changing value △ Q is arranged in steam turbine, it is quick to provide mesolow contact pipeline according to row's steam extraction amount changing value in steam turbine
Regulating butterfly valve closes amplitude instruction.
The present invention provides thermal power plant unit control steam extraction, frequency modulation system, the system apply above-mentioned control method in short-term.
Example explanation:
1 330MW extraction condensing type Turbo-generator Set of certain power plant, rated power 330MW, rated speed 3000rpm, unit turn
Fast diversity factor 5%.THA operating condition rated steam inlet amount 951.7t/h, specified heat supply steam extraction amount 580t/h, specified steam extraction operating condition unit are negative
Lotus 223.73MW needs the unit to increase load direction maximum frequency modulation load increment amplitude not less than 5% specified function according to grid requirements
Rate, if unit throttle flow has reached rated steam inlet amount when the unit undertakes 580t/h thermic load, because of the unit throttle flow
Reach specified, increases the main vapour amount of 5% rated power, that is, 16.5MW burden requirement and increase above steam turbine rated steam inlet amount, then one
The unit frequency modulation is unable to satisfy grid requirements and needs to be transformed in the secondary frequency modulation permission response time.
Steam extraction frequency modulation system system corresponding with adjusting method progress in short-term is controlled according to thermal power plant unit of the present invention
And after logic transformation, the FM Function can calculate row steam extraction amount about 122t/h in reduction in short-term and can meet according to the present invention
16.5MW increases burden requirement, and is not required to improve steam turbine throttle flow, and the system reform of the present invention is simple, low cost, is easy to work
Cheng Shixian.
It is as follows that steam extraction short time frequency modulation system performance parameter is controlled after transformation:
| Serial number | Project | Unit | Numerical value |
| 1 | Frequency modulation increases and decreases steam extraction amount range | t/h | ±200 |
| 2 | Frequency modulation increases load range | MW | ±27 |
| 3 | Frequency modulation amplitude | Hz | ±0.2045 |
| 4 | Response time | s | < 1.5 |
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. a kind of control method of thermal power plant unit control steam extraction frequency modulation system in short-term, wherein the configuration of the system mainly includes
Steam turbine high-pressure cylinder (101), Steam Turbine Through IP Admission (102), turbine low pressure cylinder (103), generator (104), condenser
(105), mesolow gets in touch with the quick regulating butterfly valve of pipeline (106), heat supply extraction stop valve (107), scattered control system
(DCS), frequency modulation heat supply steam extraction correction amount control logic and control device；
Wherein steam turbine high-pressure cylinder (101), Steam Turbine Through IP Admission (102) and turbine low pressure cylinder (103) driven generator
(104)；
Main steam (201) enters boiler reheater after entering steam turbine high-pressure cylinder (101) acting, and reheated steam (202) enters vapour
After getting in touch with the quick regulating butterfly valve of pipeline (106) by the mesolow on mesolow liaison tube after turbine intermediate pressure cylinder (102) acting
It does work driven generator (104) into turbine low pressure cylinder (103), is drained into the steam that turbine low pressure cylinder (103) finishes function
Condenser (105), middle row's heat supply steam extraction (203) for heat supply are connected to mesolow liaison tube, and interface gets in touch with pipeline in mesolow
Before the quick regulating butterfly valve (106) of property, it is equipped on middle row's heat supply extraction line heat supply extraction stop valve (107), decentralised control system
System (DCS) controls generator (104) in systems；
It is characterized by: scattered control system (DCS) also controls the mesolow contact quick regulating butterfly valve of pipeline (106), it is described
The mesolow contact quick regulating butterfly valve of pipeline (106) is connected to Steam Turbine Through IP Admission (102) and turbine low pressure cylinder (103)
On liaison tube, to meet response time requirement when participating in frequency modulation；
Wherein increase frequency modulation heat supply steam extraction correction amount control in the control logic configuration of the scattered control system of thermal power plant unit (DCS)
Logic processed to arrange steam extraction in unit and participates in frequency modulation, and frequency modulation heat supply steam extraction correction amount control logic is by steam extraction frequency modulation system in short-term
The runing adjustment method of FM Function and steam extraction frequency modulation system in short-term forms；
The control method, the FM Function including being adapted to short time regulation heat supply steam extraction frequency modulation system, the FM Function is such as
Under:
F (Q)=k × △ f
In formula: f (Q) is FM Function；K is coefficient of frequency modulation；△ f is frequency modulation amplitude；△ Q is row's steam extraction amount variation in steam turbine
Value；hzpFor Steam Turbine Through IP Admission steam discharge enthalpy；hdpFor exhaust enthalpy of low pressure cylinder of steam turbine value；δ is the diversity factor of generating unit speed；n0For
Steam Turbine rated speed；pnFor the rated power of Steam Turbine.
2. control method according to claim 1, in which:
The runing adjustment method of thermal power plant unit control steam extraction frequency modulation system in short-term is 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
Middle row's steam extraction amount changing value △ Q provides mesolow contact pipeline according to row's steam extraction amount changing value in steam turbine and quickly adjusts butterfly
Valve open-width degree instruction, 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 steamer less than 50Hz by judgement power plant's frequency
Steam extraction amount changing value △ Q is arranged in machine, and mesolow contact pipeline is provided according to row's steam extraction amount changing value in steam turbine and is quickly adjusted
Butterfly valve closes amplitude instruction.
3. a kind of thermal power plant unit controls steam extraction frequency modulation system in short-term, the described in any item controls of system application claims 1 or 2
Method processed.
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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 |
| CN110943464A (en) * | 2019-12-06 | 2020-03-31 | 中国大唐集团科学技术研究院有限公司 | Method for optimizing primary frequency modulation response time |
| CN111255530A (en) * | 2020-03-19 | 2020-06-09 | 西安热工研究院有限公司 | A thermal power unit load regulation system and method with low-pressure cylinder butterfly valve assistance |
| 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 |
| CN111677566A (en) * | 2020-05-23 | 2020-09-18 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A flexible frequency modulation operation system and method for an improved cut-cylinder heating unit |
| CN114566983A (en) * | 2022-02-11 | 2022-05-31 | 华电电力科学研究院有限公司 | Primary frequency modulation optimization system of heat supply unit |
| CN114566983B (en) * | 2022-02-11 | 2024-09-20 | 华电电力科学研究院有限公司 | Primary frequency modulation optimizing system of heat supply unit |
| CN114640113A (en) * | 2022-02-22 | 2022-06-17 | 国网山东省电力公司电力科学研究院 | Method for improving secondary frequency modulation capability of thermal power generating unit by using heat supply butterfly valve |
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Application publication date: 20190621 |