CN107218087B - A kind of frequency modulation control method in Turbo-generator Set - Google Patents
A kind of frequency modulation control method in Turbo-generator Set Download PDFInfo
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- CN107218087B CN107218087B CN201710433727.2A CN201710433727A CN107218087B CN 107218087 B CN107218087 B CN 107218087B CN 201710433727 A CN201710433727 A CN 201710433727A CN 107218087 B CN107218087 B CN 107218087B
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- steam extraction
- frequency modulation
- console
- modulation control
- partition
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
Abstract
The present invention relates to power generation frequency modulation technologies, more particularly to a kind of frequency modulation control method in Turbo-generator Set, including steam turbine and console, steam turbine is equipped with extraction opening, high-pressure governing valve and low pressure pitch, is equipped with steam extraction partition in extraction opening, is connected between extraction opening and heat supply initial station by ventilating pipe, steam extraction butterfly valve is installed in ventilating pipe, console is read out grid cyclic wave, and when grid cyclic wave is more than the range of rated speed, console will do it primary frequency modulation control.Overall structure of the present invention is simple, is divided into three control stages to steam turbine progress primary frequency modulation control using console, so that steam turbine is accomplished quick response adjusting in all cases, while being capable of effective electric power grid frequency stabilization.
Description
Technical field
The present invention relates to power generation frequency modulation technologies, and in particular to a kind of frequency modulation control method in Turbo-generator Set.
Background technique
Since continuous variation is occurring for extraneous power load, and electric energy can not store, this has been resulted in power grid
Frequency also will do it fluctuation, and for electric power grid frequency stabilization, grid company requires all online generators to both participate in primary frequency modulation.When
When mains frequency fluctuation is more than 50 ± 0.033Hz, by way of load increase and decrease, quick electric power grid frequency stabilization, to reach one
The effect of secondary frequency modulation.
In the prior art, the combustion engine of GE 6FA class mostly uses greatly split axle mode, i.e., one, each band of combustion engine and steam turbine power generation
Machine carries out generator operation, and combustion engine itself has primary frequency function, and steam turbine is by combustion engine load while being influenced, into
Row primary frequency modulation, it is inadequate often to will appear response speed, is unable to satisfy the case where power grid frequency modulation requires.So if unit has
Standby extraction for heat supply mode, can generally install steam extraction partition additional in steam turbine, be adjusted in such a way that steam extraction partition opens and closes, i.e.,
Extraction for heat supply pipe network as a big accumulator, when mains frequency fluctuates, the short time reduces or increases heat supply
Amount finally reaches the purpose of quick regulator generator power output so that power generation contained by inside is quickly changed with steam.But
When the opening and closing degree of steam extraction partition is very big or very little, flow-adjusting characteristics can be very poor, cannot timely respond to power grid
Frequency modulation demand is difficult to efficiently accomplish the primary frequency modulation of turbine generator.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, to provide one kind in steam turbine generator
Frequency modulation control method in group can make steam turbine accomplish quick response adjusting in all cases, while can be effectively stable
Mains frequency.
A kind of frequency modulation control method in Turbo-generator Set, which is characterized in that including steam turbine and console, steamer
Machine is equipped with extraction opening, high-pressure governing valve and low pressure pitch, steam extraction partition is equipped in extraction opening, between extraction opening and heat supply initial station
Connected by ventilating pipe, it is characterised in that: steam extraction butterfly valve is installed in ventilating pipe, high-pressure governing valve, low pressure pitch, steam extraction every
Plate is connect with console respectively with steam extraction butterfly valve, and method includes the following steps:
1) console is read out grid cyclic wave, and when grid cyclic wave is more than the range of rated speed, console can be into
The control of row primary frequency modulation；
2) opening and closing degree of console monitoring steam extraction partition, when can satisfy primary frequency modulation control by adjusting steam extraction partition
When, frequency modulation control is participated in by steam extraction partition, steam extraction butterfly valve does not work at this time, and the valve of steam extraction butterfly valve is shown in a fully open operation；
3) opening and closing degree of console monitoring steam extraction partition, when console detects that the folding of steam extraction partition is more than effective journey
Degree, when controlling by adjusting steam extraction partition it is impossible to meet primary frequency modulation, steam extraction butterfly valve is added primary frequency modulation and controlled by console
Circuit controls the folding of steam extraction butterfly valve and steam extraction partition and monitors the opening and closing degree of steam extraction butterfly valve simultaneously.
Preferably, the range of the grid cyclic wave rated speed is 3000 ± 2 rpms.
Preferably, the control of primary frequency modulation described in step 2 is that console adjusts steam extraction partition according to external heating load
Folding, heating load is smaller, and steam extraction partition aperture is bigger；Heating load is bigger, and steam extraction partition aperture is smaller.
Preferably, the effectiveness of the folding of steam extraction partition described in step 3 is 70%.Console works in steam turbine generator
When, the opening and closing degree of steam extraction partition is monitored, when the opening and closing degree of steam extraction partition is greater than 70%, console can be by steam extraction
Primary Frequency Modulation Loop is added in butterfly valve, participates in the primary frequency modulation control of steam turbine.
Preferably, the control of primary frequency modulation described in step 3 is that console adjusts steam extraction butterfly valve according to external heating load
With the folding of steam extraction partition, heating load is smaller, and steam extraction partition aperture is bigger, and steam extraction butterfly valve opening is smaller.
A kind of frequency modulation control method in Turbo-generator Set, further includes as follows:
4) when console detects that the folding of steam extraction butterfly valve is lower than minimum, by adjusting steam extraction butterfly valve and steam extraction partition
Folding it is impossible to meet primary frequency modulation control when, console control high-pressure governing valve and low pressure pitch be added primary frequency modulation control back
Road.
Preferably, the minimum of the folding of steam extraction butterfly valve described in step 4 is 5%.
Preferably, the control of primary frequency modulation described in step 4 is to control the folding of steam extraction butterfly valve and steam extraction partition simultaneously
Adjust the throttle flow of high-pressure governing valve and low pressure pitch.Turbo-generator Set obtains the opening and closing degree of steam extraction butterfly valve by console,
When the opening and closing degree of steam extraction butterfly valve is less than 5%, console controls high-pressure governing valve and primary frequency modulation control is added in low pressure pitch, i.e.,
The throttle flow that high-pressure governing valve and low pressure pitch are adjusted while controlling the folding of steam extraction butterfly valve and steam extraction partition guarantees primary adjust
Frequency control can normally effectively.
Compared to the prior art the present invention, has the following advantages that and effect: overall structure is simple, is divided into three using console
A control stage carries out primary frequency modulation control to steam turbine, and the opening and closing degree of steam extraction partition, steam extraction butterfly valve is monitored by console,
When the folding regulating effect stabilization for controlling steam extraction partition by console, i.e., it can satisfy primary frequency modulation control using steam extraction partition
When circuit, heating load control is only participated in by steam extraction partition；When using steam extraction partition be not able to satisfy primary frequency modulation control need when, i.e.,
When steam extraction partition opening degree is very big or very little, passes through console and control steam extraction butterfly valve Primary Frequency Modulation Loop is added；In extreme work
Under condition, i.e., when not being able to satisfy primary frequency modulation control by the adjusting to steam extraction partition and steam extraction butterfly valve and needing, console control is high
It presses pitch and low pressure pitch that Primary Frequency Modulation Loop is added, i.e., adjusts high pressure tune while control steam extraction butterfly valve and steam extraction partition open and close
The throttle flow of door and low pressure pitch；Steam turbine is set to accomplish quick response adjusting in all cases, while being capable of effectively stable electricity
Net frequency.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of frequency modulation control mechanism on steam turbine generator of present invention application.
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, this Shen
Illustrative embodiments and their description please are not constituted an undue limitation on the present application for explaining the application.
Specific embodiment
The present invention provides a kind of frequency modulation control method in Turbo-generator Set, and steam turbine can be made to accomplish in various feelings
Quick response is adjusted under condition, while being capable of effective electric power grid frequency stabilization.
It is understandable in order to enable the above objects, features and advantages of the present invention to become apparent, with reference to the accompanying drawing to this hair
Bright specific embodiment is described in detail.
Detail is elaborated in the following description to fully understand the present invention.But the present invention can with it is a variety of not
Other way described herein is same as to implement, those skilled in the art can do class without violating the connotation of the present invention
Like popularization.Therefore the present invention is not limited by following public specific embodiment.
As shown in Figure 1, steam turbine 1 used in the present embodiment is equipped with extraction opening, high-pressure governing valve 2 and low pressure pitch 3, take out
Steam extraction partition 4 is installed in steam ports, is connected between extraction opening and heat supply initial station 6 by ventilating pipe, is equipped in ventilating pipe
Steam extraction butterfly valve 5, high-pressure governing valve 2, low pressure pitch 3, steam extraction partition 4 are connect with console respectively with steam extraction butterfly valve 5.
A kind of frequency modulation control method in Turbo-generator Set uses the above-mentioned frequency modulation control in Turbo-generator Set
Mechanism processed, includes the following steps:
1) console is read out grid cyclic wave, and grid cyclic wave is generator speed, and the rated speed of generator is
3000 rpms, when its fluctuation of speed is more than ± 2 rpms, console can carry out primary frequency modulation control to generating set
System；
2) opening and closing degree of console monitoring steam extraction partition 4, when can satisfy primary frequency modulation control by adjusting steam extraction partition 4
When processed, frequency modulation control is participated in by steam extraction partition 4, steam extraction butterfly valve 5 does not work at this time, and the valve of steam extraction butterfly valve 5 is shown in a fully open operation；
3) opening and closing degree of console monitoring steam extraction partition 4, when console detects that the folding of steam extraction partition 4 is more than effective
Degree, when controlling by adjusting steam extraction partition 4 it is impossible to meet primary frequency modulation, primary frequency modulation is added in steam extraction butterfly valve 5 by console
Control loop controls the folding of steam extraction butterfly valve 5 and steam extraction partition 4 and monitors the opening and closing degree of steam extraction butterfly valve 5 simultaneously.
Firstly, console adjusts the folding of steam extraction partition 4 by monitoring main inlet throttle-stop valve to the heat supply of steam turbine in step 2,
The heating load of main inlet throttle-stop valve is smaller, and 4 aperture of steam extraction partition is bigger；The heating load of main inlet throttle-stop valve is bigger, and 4 aperture of steam extraction partition is smaller.
Secondly, the effectiveness that steam extraction partition described in step 34 opens and closes is 70%.Console works in steam turbine generator
When, the opening and closing degree of steam extraction partition 4 is monitored, when the opening and closing degree of steam extraction partition 4 is greater than 70%, console can will be taken out
Primary Frequency Modulation Loop is added in vapour butterfly valve 5, participates in the primary frequency modulation control of steam turbine.
It should be noted that in step 2 console by monitor main inlet throttle-stop valve steam extraction butterfly valve is adjusted to the heat supply of steam turbine
5 and steam extraction partition 4 folding, the heating load of main inlet throttle-stop valve is smaller, and 4 aperture of steam extraction partition is bigger, and 5 aperture of steam extraction butterfly valve is smaller.
Primary frequency modulation control loop is added in the case where the regulating effect of steam extraction partition 4 is very poor for steam extraction butterfly valve 5, improves
The scope of application of the frequency modulation control method.
Another frequency modulation control method in Turbo-generator Set includes the following:
1) console is read out grid cyclic wave, and grid cyclic wave is generator speed, and the rated speed of generator is
3000 rpms, when its fluctuation of speed is more than ± 2 rpms, console can carry out primary frequency modulation control to generating set
System；
2) opening and closing degree of console monitoring steam extraction partition 4, when can satisfy primary frequency modulation control by adjusting steam extraction partition 4
When processed, frequency modulation control is participated in by steam extraction partition 4, steam extraction butterfly valve 5 does not work at this time, and the valve of steam extraction butterfly valve 5 is shown in a fully open operation；
3) opening and closing degree of console monitoring steam extraction partition 4, when console detects that the folding of steam extraction partition 4 is more than effective
Degree, when controlling by adjusting steam extraction partition 4 it is impossible to meet primary frequency modulation, primary frequency modulation is added in steam extraction butterfly valve 5 by console
Control loop controls the folding of steam extraction butterfly valve 5 and steam extraction partition 4 and monitors the opening and closing degree of steam extraction butterfly valve 5 simultaneously；
4) when console detect the folding of steam extraction butterfly valve 5 lower than minimum, by adjusting steam extraction butterfly valve 5 and steam extraction every
When the folding of plate 4 is controlled it is impossible to meet primary frequency modulation, console controls high-pressure governing valve 2 and primary frequency modulation is added in low pressure pitch 3
Control loop.
Wherein, the minimum that steam extraction butterfly valve described in step 45 opens and closes is 5%.Console works in steam turbine generator
When, the opening and closing degree of steam extraction butterfly valve 5 is monitored.When the opening and closing degree of steam extraction butterfly valve 5 is less than 5%, console controls high pressure
Primary frequency modulation control loop is added in pitch 2 and low pressure pitch 3, i.e., while controlling the folding of steam extraction butterfly valve 5 and steam extraction partition 4
The throttle flow of high-pressure governing valve 2 and low pressure pitch 3 is adjusted, guarantees that primary frequency modulation control can normally effectively.
In the case that console passes through while adjusting steam extraction butterfly valve 5 and 4 regulating effect of steam extraction partition is very poor, console control
Frequency modulation control is added in high-pressure governing valve 2 and low pressure pitch 3 processed, improves the scope of application of the primary frequency modulation control method.
In the present invention, all automatic control instructions can be completed by the prior art.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention
The technical staff in field can make various modifications or additions to the described embodiments or by a similar method
Substitution, content without departing from description of the invention or beyond the scope defined by this claim should belong to this
The protection scope of invention.
Claims (8)
1. a kind of frequency modulation control method in Turbo-generator Set, which is characterized in that including steam turbine and console, steam turbine
It is equipped with extraction opening, high-pressure governing valve and low pressure pitch, steam extraction partition is installed in extraction opening, is led between extraction opening and heat supply initial station
Ventilating pipe connection is crossed, steam extraction butterfly valve, high-pressure governing valve, low pressure pitch, steam extraction partition and steam extraction butterfly valve are installed in ventilating pipe
It is connect respectively with console, method includes the following steps:
1) console is read out grid cyclic wave, and when grid cyclic wave is more than the range of rated speed, console will do it one
Secondary frequency modulation control；
2) opening and closing degree of console monitoring steam extraction partition, when can satisfy primary frequency modulation control by adjusting steam extraction partition,
Frequency modulation control is participated in by steam extraction partition, steam extraction butterfly valve does not work at this time, and the valve of steam extraction butterfly valve is shown in a fully open operation；
3) console monitoring steam extraction partition opening and closing degree, when console detect steam extraction partition folding be more than effectiveness,
When controlling by adjusting steam extraction partition it is impossible to meet primary frequency modulation, console controls back steam extraction butterfly valve addition primary frequency modulation
Road controls the folding of steam extraction butterfly valve and steam extraction partition and monitors the opening and closing degree of steam extraction butterfly valve simultaneously.
2. the frequency modulation control method according to claim 1 in Turbo-generator Set, it is characterised in that: institute in step 2
The primary frequency modulation control stated is that console adjusts the folding of steam extraction partition according to external heating load, and heating load is smaller, steam extraction every
Plate aperture is bigger；Heating load is bigger, and steam extraction partition aperture is smaller.
3. the frequency modulation control method according to claim 1 in Turbo-generator Set, it is characterised in that: institute in step 3
The effectiveness for stating the folding of steam extraction partition is 70%.
4. the frequency modulation control method according to claim 1 in Turbo-generator Set, it is characterised in that: institute in step 3
The primary frequency modulation control stated is the folding that console adjusts steam extraction butterfly valve and steam extraction partition according to external heating load, and heating load is got over
Small, steam extraction partition aperture is bigger, and steam extraction butterfly valve opening is smaller.
5. the frequency modulation control method according to claim 1 in Turbo-generator Set, it is characterised in that: the power grid week
The range of the rated speed of wave is 3000 ± 2 rpms.
6. the frequency modulation control method according to claim 1 in Turbo-generator Set, it is characterised in that: further include as
Under:
4) when console detects the folding of steam extraction butterfly valve lower than minimum, by adjusting opening for steam extraction butterfly valve and steam extraction partition
It closes it is impossible to meet when primary frequency modulation control, console controls high-pressure governing valve and primary frequency modulation control loop is added in low pressure pitch.
7. the frequency modulation control method according to claim 6 in Turbo-generator Set, it is characterised in that: institute in step 4
The minimum for stating the folding of steam extraction butterfly valve is 5%.
8. the frequency modulation control method according to claim 6 in Turbo-generator Set, it is characterised in that: institute in step 4
The primary frequency modulation control stated is the folding in control steam extraction butterfly valve and steam extraction partition while adjusting high-pressure governing valve and low pressure pitch
Throttle flow.
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| CN201710433727.2A CN107218087B (en) | 2017-06-09 | 2017-06-09 | A kind of frequency modulation control method in Turbo-generator Set |
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| CN107965356B (en) * | 2017-12-25 | 2020-01-31 | 东北电力大学 | Flexibility improvement control method for thermal power generating units |
| CN110778368B (en) * | 2019-11-11 | 2022-04-12 | 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 |
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| CN102537933A (en) * | 2011-12-30 | 2012-07-04 | 冯伟忠 | Adjustable feed water heat regenerative system for turbo generator unit |
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