CN109066780A - Steam turbine single machine alone net runs DEH control method - Google Patents
Steam turbine single machine alone net runs DEH control method Download PDFInfo
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- CN109066780A CN109066780A CN201810949176.XA CN201810949176A CN109066780A CN 109066780 A CN109066780 A CN 109066780A CN 201810949176 A CN201810949176 A CN 201810949176A CN 109066780 A CN109066780 A CN 109066780A
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- frequency modulation
- steam turbine
- signal
- isolated network
- generating set
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
-
- 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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Turbines (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Steam turbine single machine alone net runs DEH control method, is related to a kind of steam turbine single machine control method.Single machine alone net operation can not be controlled to solve existing DEH.The invention detects that when steam turbine motor group is solution net state signal, or when turbine speed signal>3035RPM, perhaps turbine speed signal be<2965RPM when or when detecting that isolated network puts into signal manually, the corresponding isolated network of the corresponding generating set of control steam turbine puts into bulk power grid.When detecting the corresponding generating set of steam turbine is grid connection state and 2965RPM≤turbine speed≤3035RPM, or when needing excision manually, the corresponding grid parts of the corresponding generating set of control steam turbine are cut off from bulk power grid, form isolated network.Then the corresponding grid parts solution net action signal of the corresponding generating set of acquisition steam turbine, turbine speed signal and frequency modulation frequency modulation switching signal；Primary frequency modulation adjusting is carried out after the frequency modulation amount of the corresponding output of frequency modulation frequency modulation amount is superimposed with steam turbine actual speed value.Switching suitable for steam turbine single machine alone net controls.
Description
Technical field
The present invention relates to steam turbine control fields, and in particular to a kind of steam turbine single machine control method.
Background technique
The country hastens towards saturation thermal power project day at present, and the electric energy that part power plant issues cannot be completely transported in big net.In order to
The generating capacity of steam turbine is given full play to, the electric energy of sending is fed directly in the small net of enterprises by many power plants for self-supply, both
Spending is saved, and improves efficiency.Such as: certain Chinalco, 3# and 4# generating set are fed directly to enterprises isolated network
In, all power supplies of aluminium manufacturer are provided, here it is common isolated power grid modes.But in general situation, isolated power grid
Condition is extremely harsh, is the entire isolated power grid of single unit band, and former DEH control logic is unable to complete such control purpose.
Meanwhile also exactly as the development in pluralism of electric system still will appear single machine or minor scale power net in some cases
The case where operation or demand.So need to encounter bulk power grid off-the-line needs at the case where isolated network or isolated network investment bulk power grid operation
It wants.
It is former to protect based on electrical equipment when bulk power grid off-the-line is at isolated network according in current conventional thermoelectricity DEH control
Protected mode and be no longer appropriate for isolated power grid to directly control the control mode of generator power, need to be switched to generator
The speed control method of energy balance in group synchronous operation and system.Isolated power grid feature and large-scale interconnected power system have more very much not
Together, and the complexity of isolated network itself, the frequency control technology problem under isolated island is much larger than large-scale interconnected power system.
Steam turbine DEH control at present does not have isolated network control function, especially under this extreme operating condition of single machine alone net,
DEH control can not provide reliable control method.
Summary of the invention
The present invention can not control single machine alone net operation to solve existing DEH.And then propose a kind of vapour
Turbine single machine alone net runs DEH control method.
Steam turbine single machine alone net runs DEH control method, comprising the following steps:
Step 1, the corresponding grid parts solution net state signal of the corresponding generating set of acquisition steam turbine, turbine speed signal
With isolated network manual switching signal；
The corresponding grid parts solution net state signal of the corresponding generating set of steam turbine includes solution net state and grid connection state；It is lonely
Net manual switching signal includes that dynamic investment signal and isolated network cut off signal to isolated network manually manually；
When meeting any one condition in isolated network investment condition, the corresponding isolated network of the corresponding generating set of control steam turbine is thrown
Enter bulk power grid, i.e. isolated network is put into；
Isolated network puts into condition:
The corresponding generating set of a1, steam turbine is solution net state；
B1, turbine speed > 3035RPM；
C1, turbine speed < 2965RPM；
D1, detect that isolated network puts into signal manually；
When meeting the full terms in isolated network excision condition or when needing excision manually, control steam turbine accordingly generates electricity
The corresponding grid parts of unit are cut off from bulk power grid, form isolated network, i.e. isolated network is cut off；
Isolated network cuts off condition:
The corresponding generating set of a2, steam turbine is grid connection state；
B2,2965RPM≤turbine speed≤3035RPM；
Step 2, the corresponding grid parts solution net action signal of the corresponding generating set of acquisition steam turbine, turbine speed signal
With frequency modulation frequency modulation switching signal；
The corresponding grid parts solution net action signal of the corresponding generating set of steam turbine includes isolated network investment action signal and orphan
Net excision action signal；Frequency modulation frequency modulation switching signal includes that frequency modulation frequency modulation puts into signal and frequency modulation frequency modulation cuts off letter manually manually
Number；
When collecting isolated network excision action signal or frequency modulation frequency modulation cuts off signal manually, excision frequency modulation frequency modulation control；When
When collecting frequency modulation frequency modulation and putting into signal manually, investment frequency modulation frequency modulation control；Frequency modulation frequency modulation is carried out, then by frequency modulation frequency modulation amount pair
The frequency modulation amount that should be exported carries out primary frequency modulation after being superimposed with steam turbine actual speed value, primary frequency modulation is droop control.
Further, the process for " carrying out frequency modulation frequency modulation " described in step 2 is as follows:
Frequency modulation frequency modulation uses PID controller, sets rated speed as 3000RPM, feedback variable is that the reality of steam turbine turns
Speed；Target tune output valve is calculated by the actual speed value and rated speed value of steam turbine, then passes through the automatic of PID controller
The manual mode of mode or PID controller carries out frequency modulation frequency modulation control；
When meeting any one condition in PID controller manual mode entry condition, start PID controller manual mode
Carry out frequency modulation frequency modulation control；
PID controller manual mode entry condition:
A3, the excision of frequency modulation frequency modulation function；
B3,2995RPM < actual speed < 3005RPM；
C3, actual speed < 3000RPM, and main vapour pressure is lower than limit value；
When meeting in PID controller automatic mode entry condition " a4 and b4 and (non-c4) ", starting PID controller is automatic
Mode carries out frequency modulation frequency modulation control；
PID controller automatic mode entry condition:
A4, actual speed > 3005RPM；
B4, actual speed < 2995RPM；
C4, actual speed < 3000RPM, and main vapour pressure is lower than limit value.
The invention has the following advantages:
It can overcome existing DEH that can not run the defect controlled to single machine alone net using the present invention, can incite somebody to action
Control method of the invention is converted to corresponding control view plug-ins, and existing DEH is written, and can also cooperate existing DEH, real
The control of existing single machine alone net operation switching, and almost can satisfy 99 or more percent single machine alone net situation and thrown
Control is cut, while the entire stabilization of power grids can also be made after cutting off or being incorporated to big net；The present invention can also meet separate unit machine simultaneously
Group is the control of entire station service power supply, is enable to respond quickly the rapid fluctuations of load in isolated network, being capable of adjust automatically stable state work
Make a little, to stablize net frequency.
Detailed description of the invention
Fig. 1 is the switching control figure of isolated network；
Fig. 2 is the switching control figure of frequency modulation frequency modulation；
Fig. 3 is the droop control control figure of primary frequency modulation.
Specific embodiment
Specific embodiment 1: embodiment is described with reference to Fig. 1,
Steam turbine single machine alone net runs DEH control method, comprising the following steps:
Step 1, the corresponding grid parts solution net state signal of the corresponding generating set of acquisition steam turbine, turbine speed signal
With isolated network manual switching signal；
The corresponding grid parts solution net state signal of the corresponding generating set of steam turbine includes solution net state (non-grid connection state)
And grid connection state；Isolated network manual switching signal includes that dynamic investment signal and isolated network cut off signal to isolated network manually manually；
When meeting any one condition in isolated network investment condition, the corresponding isolated network of the corresponding generating set of control steam turbine is thrown
Enter bulk power grid, i.e. isolated network is put into；
Isolated network puts into condition:
The corresponding generating set of a1, steam turbine is solution net state；
B1, turbine speed > 3035RPM；
C1, turbine speed < 2965RPM；
D1, detect that isolated network puts into signal manually；
When meeting the full terms in isolated network excision condition or when needing excision manually, control steam turbine accordingly generates electricity
The corresponding grid parts of unit are cut off from bulk power grid, form isolated network, i.e. isolated network is cut off；
That is: when detect the corresponding generating set of steam turbine be solution net state signal when or turbine speed signal be >
3035RPM, perhaps turbine speed signal is < 2965RPM or when detecting that isolated network puts into signal manually, controls vapour
The corresponding isolated network of the corresponding generating set of turbine puts into bulk power grid, i.e. isolated network is put into；
Isolated network cuts off condition:
The corresponding generating set of a2, steam turbine is grid connection state；
B2,2965RPM≤turbine speed≤3035RPM；
That is: when detect the corresponding generating set of steam turbine be grid connection state and 2965RPM≤turbine speed≤
When 3035RPM, or when needing excision manually, the corresponding grid parts of the corresponding generating set of control steam turbine are cut from bulk power grid
It removes, forms isolated network.
Step 2, the corresponding grid parts solution net action signal of the corresponding generating set of acquisition steam turbine, turbine speed signal
With frequency modulation frequency modulation switching signal；
The corresponding grid parts solution net action signal of the corresponding generating set of steam turbine includes isolated network investment action signal (step
Isolated network puts into corresponding signal in 1) and isolated network excision action signal (isolated network cuts off corresponding signal in step 1)；Frequency modulation frequency modulation
Switching signal includes that frequency modulation frequency modulation puts into signal and frequency modulation frequency modulation cuts off signal manually manually；
When collecting isolated network excision action signal or frequency modulation frequency modulation cuts off signal manually, excision frequency modulation frequency modulation control；When
When collecting frequency modulation frequency modulation and putting into signal manually, investment frequency modulation frequency modulation control；Frequency modulation frequency modulation is carried out, then by frequency modulation frequency modulation amount pair
The frequency modulation amount that should be exported carries out primary frequency modulation after being superimposed with steam turbine actual speed value, primary frequency modulation is droop control.
Generating set has lost and has contacted with grid dispatching center, unit itself only has after off-the-line in bulk power grid
Once frequency modulation function, primary frequency modulation are the main problem that isolated power grid unit faces.When isolated operation, it is by primary frequency modulation only
Frequency stabilization is unable to maintain that, since primary frequency modulation cannot completely eliminate the deviation of frequency, so primary frequency modulation cannot make system
Stablize.Primary frequency modulation is droop control, and the non differential regulation that reach frequency must carry out secondary adjustment to frequency, and frequency modulation frequency modulation is just
It is that manually or automatically operation frequency modulator moves up and down the frequency characteristic of generating set in parallel, makes frequency caused by load change
Rate offset is kept within the allowable range, to reach the non differential regulation of frequency.So needing the corresponding frequency modulation of frequency modulation frequency modulation amount
The input quantity as primary frequency modulation is measured, carries out droop control after being superimposed steam turbine actual speed value, primary frequency modulation uses secondary tune
Frequency problem to be solved be frequency modulation frequency modulation investment with exit.The control of frequency modulation frequency modulation function is increased in DEH control method
System (by the corresponding control logic design of control method in deh control system), when there is the operation of small net, to replace scheduling
The effect at center.
It is actually to need to consider auxiliary protection and limitation in steam turbine single machine alone net operation DEH control process, in list
Under machine isolated power grid operating condition, it should be noted that following problems:
When a0, single machine alone net operation, grid-connected moment should cancel the logic with initial load.Because unit is not to be directly incorporated into greatly
Net does not need band initial load.
When b0, isolated power grid, turbine speed fluctuation is more violent, needs appropriate adjustment OPC action value according to the actual situation,
Prevent its frequent movement.It needs to be added rotation speed change rate decision logic simultaneously, judges speed fling lifting in advance, make up OPC with secondary
It is worth misgivings adjusted.
When c0, isolated power grid, need to consider whether steam turbine long-time slow-speed of revolution operation needs chaser to protect.
Specific embodiment 2:
The process for " carrying out frequency modulation frequency modulation " described in step 2 is as follows:
Frequency modulation frequency modulation uses PID controller, sets rated speed as 3000RPM, feedback variable is that the reality of steam turbine turns
Speed；Target tune output valve is calculated by the actual speed value and rated speed value of steam turbine, then passes through the automatic of PID controller
The manual mode of mode or PID controller carries out frequency modulation frequency modulation control；
When meeting any one condition in PID controller manual mode entry condition, start PID controller manual mode
Carry out frequency modulation frequency modulation control；
PID controller manual mode entry condition:
A3, the excision of frequency modulation frequency modulation function；
B3,2995RPM < actual speed < 3005RPM；
C3, actual speed < 3000RPM, and main vapour pressure is lower than limit value；
When meeting in PID controller automatic mode entry condition " a4 and b4 and (non-c4) ", starting PID controller is automatic
Mode carries out frequency modulation frequency modulation control；
PID controller automatic mode entry condition:
A4, actual speed > 3005RPM；
B4, actual speed < 2995RPM；
C4, actual speed < 3000RPM, and main vapour pressure is lower than limit value.
The purpose of frequency modulation frequency modulation is that the power of adjust automatically DEH is given, is allowed to gradually close with online load small at that time,
To achieve the effect that stable grid cyclic wave.By the investigation to domestic unit operating condition, the present invention determines to use: when
In the case that Generator Outlet Switchgear closes a floodgate, when mains frequency fluctuation is more than rated speed ± 5r/min, DEH automatically engages secondary
Frequency modulation function；After mains frequency returns to rated speed ± 5r/min, DEH cuts off frequency modulation frequency modulation function automatically.Although DEH can
After removal of load occurs, the frequency of preferably stable island network, but system frequency rests in higher point, it is necessary to use two
Secondary frequency modulation lowers the load given value of DEH system, can just frequency be made to return to rated value.
The PID controller that frequency modulation frequency modulation uses, the power of adjustable unit eliminate the static deviation of revolving speed.But it should
Function can only be put into the case where the operation of small net occurs really；If unit is run in bulk power grid, once mistakenly throw
Frequency modulation frequency modulation function is entered, it will occur the power of the assembling unit excess load in frequency minus deviation, or occur in frequency overgauge
The case where inverse probability is run, therefore, in DEH system plus people's frequency modulation frequency modulation function has certain risk.
Primary frequency modulation is the main problem that isolated power grid unit faces, and primary frequency modulation is droop control, in order to make isolated network frequency
Rate maintains near rated frequency, needs to increase unit output by the given mechanism for operating speed-regulating system to complete, such as Fig. 3 institute
Show.
It can be controlled in actual DEH control with scheme according to the invention, as the specific implementation of frequency modulation frequency modulation
Level (realize process) can carry out in the way of Fig. 2, i.e., combine according to the existing technology that Fig. 2 is indicated of the invention secondary
Frequency modulation is controlled.There are the control basis of frequency modulation frequency modulation of the invention as primary frequency modulation, the specific implementation layer of primary frequency modulation
Control can be adjusted in conjunction with the droop control side of the prior art in face (realizing process), as shown in Figure 3.
Claims (2)
1. steam turbine single machine alone net runs DEH control method, which comprises the following steps:
Step 1, the corresponding grid parts solution net state signal of the corresponding generating set of acquisition steam turbine, turbine speed signal and orphan
Net manual switching signal；
The corresponding grid parts solution net state signal of the corresponding generating set of steam turbine includes solution net state and grid connection state；Isolated network hand
Dynamic switching signal includes that dynamic investment signal and isolated network cut off signal to isolated network manually manually；
When meeting any one condition in isolated network investment condition, the corresponding isolated network investment of the corresponding generating set of control steam turbine is big
Power grid, i.e. isolated network investment；
Isolated network puts into condition:
The corresponding generating set of a1, steam turbine is solution net state；
B1, turbine speed > 3035RPM；
C1, turbine speed < 2965RPM；
D1, detect that isolated network puts into signal manually；
When meeting the full terms in isolated network excision condition or when needing excision manually, the corresponding generating set of control steam turbine
Corresponding grid parts are cut off from bulk power grid, form isolated network, i.e. isolated network is cut off；
Isolated network cuts off condition:
The corresponding generating set of a2, steam turbine is grid connection state；
B2,2965RPM≤turbine speed≤3035RPM；
Step 2, the corresponding grid parts solution net action signal of the corresponding generating set of acquisition steam turbine, turbine speed signal and two
Secondary frequency modulation switching signal；
The corresponding grid parts solution net action signal of the corresponding generating set of steam turbine includes that isolated network investment action signal and isolated network are cut
Except action signal；Frequency modulation frequency modulation switching signal includes that frequency modulation frequency modulation puts into signal and frequency modulation frequency modulation cuts off signal manually manually；
When collecting isolated network excision action signal or frequency modulation frequency modulation cuts off signal manually, excision frequency modulation frequency modulation control；Work as acquisition
When putting into signal manually to frequency modulation frequency modulation, investment frequency modulation frequency modulation control；Frequency modulation frequency modulation is carried out, is then corresponded to frequency modulation frequency modulation amount defeated
Frequency modulation amount out carries out primary frequency modulation after being superimposed with steam turbine actual speed value, primary frequency modulation is droop control.
2. steam turbine single machine alone net runs DEH control method according to claim 1, which is characterized in that described in step 2
The process of " carrying out frequency modulation frequency modulation " is as follows:
Frequency modulation frequency modulation uses PID controller, sets rated speed as 3000RPM, feedback variable is the actual speed of steam turbine；It is logical
The actual speed value and rated speed value for crossing steam turbine calculate target tune output valve, then pass through the automatic mode of PID controller
Or the manual mode of PID controller carries out frequency modulation frequency modulation control；
When meeting any one condition in PID controller manual mode entry condition, starting PID controller manual mode is carried out
Frequency modulation frequency modulation control；
PID controller manual mode entry condition:
A3, the excision of frequency modulation frequency modulation function；
B3,2995RPM < actual speed < 3005RPM；
C3, actual speed < 3000RPM, and main vapour pressure is lower than limit value；
When meeting in PID controller automatic mode entry condition " a4 and b4 and (non-c4) ", start PID controller automatic mode
Carry out frequency modulation frequency modulation control；
PID controller automatic mode entry condition:
A4, actual speed > 3005RPM；
B4, actual speed < 2995RPM；
C4, actual speed < 3000RPM, and main vapour pressure is lower than limit value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810949176.XA CN109066780B (en) | 2018-08-20 | 2018-08-20 | DEH control method for single-machine isolated network operation of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810949176.XA CN109066780B (en) | 2018-08-20 | 2018-08-20 | DEH control method for single-machine isolated network operation of steam turbine |
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| CN109066780B CN109066780B (en) | 2022-06-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478322A (en) * | 2020-04-26 | 2020-07-31 | 辽宁东科电力有限公司 | Method for identifying and controlling isolated power grid operation mode |
| CN112510752A (en) * | 2020-11-10 | 2021-03-16 | 中国石油化工股份有限公司 | Method and device for automatic switching on and off of primary frequency modulation of self-contained generator set |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103166241A (en) * | 2011-12-14 | 2013-06-19 | 深圳市康必达中创科技有限公司 | Isolated power grid stability control system |
| EP2668819A1 (en) * | 2011-01-28 | 2013-12-04 | Sinvent AS | System and system elements for direct electrical heating of subsea pipelines |
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2018
- 2018-08-20 CN CN201810949176.XA patent/CN109066780B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2668819A1 (en) * | 2011-01-28 | 2013-12-04 | Sinvent AS | System and system elements for direct electrical heating of subsea pipelines |
| CN103166241A (en) * | 2011-12-14 | 2013-06-19 | 深圳市康必达中创科技有限公司 | Isolated power grid stability control system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478322A (en) * | 2020-04-26 | 2020-07-31 | 辽宁东科电力有限公司 | Method for identifying and controlling isolated power grid operation mode |
| CN111478322B (en) * | 2020-04-26 | 2024-03-12 | 辽宁东科电力有限公司 | Identification and control method for operation mode of isolated power grid |
| CN112510752A (en) * | 2020-11-10 | 2021-03-16 | 中国石油化工股份有限公司 | Method and device for automatic switching on and off of primary frequency modulation of self-contained generator set |
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| CN109066780B (en) | 2022-06-21 |
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Effective date of registration: 20221226 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |