CN107834922B - A kind of condition control method and device of the limitation of field regulator stator current - Google Patents
A kind of condition control method and device of the limitation of field regulator stator current Download PDFInfo
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- CN107834922B CN107834922B CN201711090213.8A CN201711090213A CN107834922B CN 107834922 B CN107834922 B CN 107834922B CN 201711090213 A CN201711090213 A CN 201711090213A CN 107834922 B CN107834922 B CN 107834922B
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- field regulator
- end voltage
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001360 synchronised effect Effects 0.000 claims abstract description 153
- 238000012546 transfer Methods 0.000 claims abstract description 80
- 230000007423 decrease Effects 0.000 claims abstract description 69
- 238000009825 accumulation Methods 0.000 claims description 43
- 238000012544 monitoring process Methods 0.000 claims description 23
- 230000005284 excitation Effects 0.000 claims description 20
- 238000004590 computer program Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 10
- 230000017525 heat dissipation Effects 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 8
- 230000006399 behavior Effects 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 6
- 230000007257 malfunction Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 13
- 238000004088 simulation Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
Abstract
The present invention provides the condition control methods and device of a kind of limitation of field regulator stator current, are related to Operation of Electric Systems and security technology area.Method includes: when field regulator operates normally, when electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, it carries out encouraging adjusting movement by force by field regulator, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, the output of field regulator main ring is switched to stator current limitation system link output；When the state of field regulator is that stator current limits the output of system link, causes the set end voltage of synchronous generator to decline if electric system is broken down or disturbed again, according to a state transfer criterion, judge whether current working meets state transfer criterion；When current working meets state transfer criterion, stator current limitation system link output is switched to the output of field regulator main ring, to carry out encouraging adjusting movement by force again by field regulator.
Description
Technical field
The present invention relates to Operation of Electric Systems and security technology areas more particularly to a kind of field regulator stator current to limit
The condition control method and device of system.
Background technique
With the development of China's electric system, the structure and the method for operation of electric system are increasingly sophisticated, electric system it is steady
Qualitative question is more and more important.Currently, the exciter control system of synchronous generator is considered as improving and improving electric power system stability
Qualitative most economical most effective measure.As shown in Figure 1, the exciter control system 10 of synchronous generator generally comprises exciting power list
Member 101 and field regulator (Automatic Voltage Regulator, abbreviation AVR) 102.Wherein exciting power unit 101
Power supply is provided to the magnetic field winding of synchronous generator 20 to establish magnetic field, and field regulator 102 according to input signal and gives
Adjustment criteria (such as according to the detection information of the synchronous generator outlet side of acquisition) control exciting power unit 101 output,
Achieve the purpose that adjusting exciting current meets safe operation of power system for maintaining the voltage of synchronous generator 20 constant
It needs.Field regulator completes maintenance voltage level, while providing reactive power, can be mentioned by increasing auxiliary limiting element
The safety of high exciter control system obtains more excellent control performance.Therefore the research of excitation system auxiliary limitation is to generator
The stable operation of itself or even electric system is of great importance, wherein stator current limitation (Stator Current Limit,
SCL) link is a typical additive control function in auxiliary limitation.The mode that stator current limitation gets involved in AVR main ring can be with
As shown in Fig. 2, wherein UEERIt indicates the departure of set end voltage and given value, is exported for AVR main ring, USCLindFor SCL link
Output, LV are that low pass compares door, and PID is AVR Controlling model, UAIt is exported for AVR, for being output to exciting power unit.
The course of work of the mode of stator current limitation intervention main ring is: when AVR is operated normally, AVR main ring works, and
SCL link does not work.The set end voltage of synchronous generator is caused to decline if certain failure or disturbance occur for electric system,
AVR, which will do it, encourages adjusting by force, after meeting SCL link criterion, so that AVR can be switched to SCL link by AVR main ring.But it is existing
Have technology the problem is that, when AVR is now in SCL Absent measures, led if electric system is broken down or disturbed again
Cause synchronous generator set end voltage decline, then AVR can not carry out again by force encourage adjusting, lead to the voltage mistake of electric system
It is low, cause power system collapse.
Summary of the invention
The embodiment of the present invention provides the condition control method and device of a kind of field regulator stator current limitation, with solution
When certainly AVR is in SCL Absent measures, if electric system is broken down or is disturbed again under the set end voltage for leading to synchronous generator
Drop, then AVR can not carry out again by force encourage adjusting, lead to the brownout of electric system, cause asking for power system collapse
Topic.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of condition control method of field regulator stator current limitation, comprising:
When field regulator operates normally, whether monitoring electric system is broken down or is disturbed and lead to synchronous generator
Set end voltage decline；
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, pass through field regulator
It carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, by Excitation Adjustment
Section device main ring output is switched to stator current limitation system link output；
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down again
Or disturbance causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges whether current working meets institute
State state transfer criterion；
When current working meets the state transfer criterion, stator current limitation system link output is switched to excitation
Adjuster main ring output, to carry out encouraging adjusting movement by force again by field regulator.
Specifically, it is described when electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, lead to
Overexcitation adjuster carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases, meets stator current limitation and sentences
According to rear, the output of field regulator main ring is switched to stator current limitation system link output, comprising:
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, pass through field regulator
It carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases；
The stator current of synchronous generator is monitored, and reaches pre-set stator electricity in the stator current of synchronous generator
When ductility limit system start up value, it is tired according to the stator current of synchronous generator progress heat that system is limited by stator current
Meter calculates；
Reach pre-set stator current limitation system in the heat accumulation value that stator current limitation system carries out heat accumulation
When system maximum permissible value, the output of field regulator main ring is switched to stator current limitation system link output, so that synchronous
The stator current of generator is reduced to a return value, limits system lower than the pre-set stator current in the return value
When initiation value, system is limited by stator current and carries out heat dissipation calculating.
Specifically, when the state in field regulator is that stator current limits the output of system link, if electric system
Breaking down or disturb again causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges current work
Whether condition meets the state transfer criterion, comprising:
Determine stator current limitation system carry out heat accumulation heat do not radiate complete when, electric system occurs again
Failure or disturbance cause the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judge whether current working is full
The foot state transfer criterion.
Specifically, described judge whether current working meets the state transfer criterion according to a state transfer criterion, packet
It includes:
The set end voltage of synchronous generator is obtained in real time；
And according to pre-set time step, the generator terminal electricity in a time step with the presence or absence of synchronous generator is determined
Drops numerical value is greater than pre-set threshold value；
When being greater than pre-set threshold value there are the set end voltage of synchronous generator decline numerical value in a time step,
Determine that current working meets the state transfer criterion.
A kind of behavior control device of field regulator stator current limitation, comprising:
Malfunction monitoring unit, for when field regulator operates normally, whether monitoring electric system to be broken down or disturbed
It is dynamic that the set end voltage of synchronous generator is caused to decline；
Regulation unit is encouraged by force, leads to the set end voltage of synchronous generator for breaking down or disturbing in electric system
It when decline, carries out encouraging adjusting movement by force by field regulator, so that the stator current of synchronous generator increases, meets stator electricity
After ductility limit criterion, the output of field regulator main ring is switched to stator current limitation system link output；
Judging unit, when limiting the output of system link for the state in field regulator for stator current, and power train
System is broken down or is disturbed again when the set end voltage of synchronous generator being caused to decline, and according to a state transfer criterion, judgement is worked as
Whether preceding operating condition meets the state transfer criterion；
Status toggle unit, for when current working meets the state transfer criterion, stator current to be limited system
Link output is switched to the output of field regulator main ring, to carry out encouraging adjusting movement by force again by field regulator.
Specifically, described encourage by force regulation unit, comprising:
Adjusting control module is encouraged by force, leads to the set end voltage of synchronous generator for breaking down or disturbing in electric system
When decline, carry out encouraging adjusting movement by force by field regulator, so that the stator current of synchronous generator increases；
Heat accumulation computing module, for monitoring the stator current of synchronous generator, and in the stator of synchronous generator electricity
When stream reaches pre-set stator current limitation system start up value, system is limited according to the synchronous generator by stator current
The stator current of machine carries out heat accumulation calculating；
Radiate computing module, and the heat accumulation value for carrying out heat accumulation in stator current limitation system, which reaches, to be preset
Stator current limit system maximum permissible value when, by field regulator main ring output be switched to stator current limitation system link
Output, so that the stator current of synchronous generator is reduced to a return value, in the return value lower than described pre-set
When stator current limits system start up value, system is limited by stator current and carries out heat dissipation calculating.
In addition, the judging unit, is specifically used for:
Determine stator current limitation system carry out heat accumulation heat do not radiate complete when, electric system occurs again
Failure or disturbance cause the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judge whether current working is full
The foot state transfer criterion.
In addition, the judging unit, is specifically used for:
The set end voltage of synchronous generator is obtained in real time；
And according to pre-set time step, the generator terminal electricity in a time step with the presence or absence of synchronous generator is determined
Drops numerical value is greater than pre-set threshold value；
When being greater than pre-set threshold value there are the set end voltage of synchronous generator decline numerical value in a time step,
Determine that current working meets the state transfer criterion.
A kind of computer readable storage medium, is stored thereon with computer program, realization when which is executed by processor
Following steps:
When field regulator operates normally, whether monitoring electric system is broken down or is disturbed and lead to synchronous generator
Set end voltage decline；
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, pass through field regulator
It carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, by Excitation Adjustment
Section device main ring output is switched to stator current limitation system link output；
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down again
Or disturbance causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges whether current working meets institute
State state transfer criterion；
When current working meets the state transfer criterion, stator current limitation system link output is switched to excitation
Adjuster main ring output, to carry out encouraging adjusting movement by force again by field regulator.
A kind of computer equipment including memory, processor and is stored in the meter that storage is upper and can run on a processor
Calculation machine program, the processor perform the steps of when executing described program
When field regulator operates normally, whether monitoring electric system is broken down or is disturbed and lead to synchronous generator
Set end voltage decline；
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, pass through field regulator
It carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, by Excitation Adjustment
Section device main ring output is switched to stator current limitation system link output；
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down again
Or disturbance causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges whether current working meets institute
State state transfer criterion；
When current working meets the state transfer criterion, stator current limitation system link output is switched to excitation
Adjuster main ring output, to carry out encouraging adjusting movement by force again by field regulator.
The condition control method and device of a kind of field regulator stator current limitation provided in an embodiment of the present invention, can
When the state of field regulator is that stator current limits the output of system link, led if electric system is broken down or disturbed again
The set end voltage decline for causing synchronous generator, can judge whether current working meets the shape according to a state transfer criterion
State transfer criterion；To which when current working meets the state transfer criterion, stator current is limited system link outputting cutting
It is changed to the output of field regulator main ring, to carry out encouraging adjusting movement by force again by field regulator.The present invention in this way can be
When field regulator (AVR) is in stator current limiting element (SCL link) control, when electric system is broken down or disturbed again
Dynamic that the set end voltage of synchronous generator is caused to decline, field regulator can carry out stator current limitation system link output in time
Be switched to field regulator main ring output movement, thus field regulator can carry out again by force encourage adjusting, avoid electricity
The brownout of Force system, the problem of causing power system collapse.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the schematic diagram of the exciter control system of synchronous generator in the prior art；
Fig. 2 is the schematic diagram that stator current limitation gets involved in AVR main ring；
Fig. 3 is a kind of process of the condition control method of field regulator stator current limitation provided in an embodiment of the present invention
Figure one；
Fig. 4 is a kind of process of the condition control method of field regulator stator current limitation provided in an embodiment of the present invention
Figure two；
Fig. 5 is the one machine infinity bus system schematic diagram established in the embodiment of the present invention by DIgSILENT software；
Fig. 6 is the schematic diagram of unmodified SCL Link Model in the prior art；
Fig. 7 is the model schematic of the improved SCL link in the embodiment of the present invention；
Fig. 8 is the simulation curve of set end voltage in the prior art；
Fig. 9 is the simulation curve of stator current in the prior art；
Figure 10 is the simulation waveform of the set end voltage in the embodiment of the present invention；
Figure 11 is the simulation waveform of the stator current in the embodiment of the present invention；
Figure 12 is a kind of knot of the behavior control device of field regulator stator current limitation provided in an embodiment of the present invention
Structure schematic diagram one；
Figure 13 is a kind of knot of the behavior control device of field regulator stator current limitation provided in an embodiment of the present invention
Structure schematic diagram two.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in figure 3, the embodiment of the present invention provides a kind of condition control method of field regulator stator current limitation, packet
It includes:
Step 201, when field regulator operates normally, whether monitoring electric system is broken down or is disturbed and cause to synchronize
The set end voltage of generator declines.
Step 202, break down or disturb in electric system cause synchronous generator set end voltage decline when, by encouraging
Magnestat carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion,
The output of field regulator main ring is switched to stator current limitation system link output.
Step 203, field regulator state be stator current limit system link output when, if electric system is again
Breaking down or disturbing causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges that current working is
It is no to meet the state transfer criterion.
Step 204, when current working meets the state transfer criterion, by stator current limit system link outputting cutting
It is changed to the output of field regulator main ring, to carry out encouraging adjusting movement by force again by field regulator.
A kind of condition control method of field regulator stator current limitation provided in an embodiment of the present invention, can be in excitation
When the state of adjuster is that stator current limits the output of system link, if electric system, which is broken down or disturbed again, to be caused to synchronize
The set end voltage of generator declines, and can judge whether current working meets the state switching according to a state transfer criterion
Criterion；To stator current limitation system link output be switched to and encouraged when current working meets the state transfer criterion
Magnestat main ring output, to carry out encouraging adjusting movement by force again by field regulator.The present invention can be in Excitation Adjustment in this way
When section device (AVR) is in stator current limiting element (SCL link) control, breaking down or disturb again when electric system causes
The set end voltage of synchronous generator declines, and field regulator can carry out stator current limitation system link output in time and be switched to
Field regulator main ring output movement, thus field regulator can carry out again by force encourage adjusting, avoid electric system
Brownout, the problem of causing power system collapse.
In order to make those skilled in the art be better understood by the present invention, a more detailed embodiment is set forth below,
As shown in figure 4, the embodiment of the present invention provides a kind of condition control method of field regulator stator current limitation, comprising:
Step 301, field regulator operate normally when, field regulator state be field regulator main ring export, calmly
Electron current limitation system link does not work, and the generator terminal for leading to synchronous generator is broken down or disturbed to monitoring electric system whether
Voltage decline.
Step 302, break down or disturb in electric system cause synchronous generator set end voltage decline when, by encouraging
Magnestat carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases.
Step 303, the stator current for monitoring synchronous generator, and reach in the stator current of synchronous generator and preset
Stator current when limiting system start up value, by stator current limit system according to the stator current of the synchronous generator into
Row heat accumulation calculates.
Step 304 reaches pre-set stator electricity in the heat accumulation value that stator current limitation system carries out heat accumulation
When ductility limit system maximum permissible value, the output of field regulator main ring is switched to stator current limitation system link output, with
So that the stator current of synchronous generator is reduced to a return value, it is lower than the pre-set stator current in the return value
When limiting system start up value, system is limited by stator current and carries out heat dissipation calculating.
Step 305, determine stator current limitation system carry out heat accumulation heat do not radiate complete when, electric system
Breaking down or disturb again causes the set end voltage of synchronous generator to decline, and obtains the set end voltage of synchronous generator in real time,
And according to pre-set time step, determines and decline number with the presence or absence of the set end voltage of synchronous generator in a time step
Value is greater than pre-set threshold value.
Herein, compared with prior art, under normal circumstances, dissipated in the heat that stator current limitation system carries out heat accumulation
When heat is completed (heat all disperses), it is defeated just field regulator main ring to be switched back by stator current limitation system link output
Out.And the prior art does not use above-mentioned steps 305 and subsequent step 306 and step 307, then stator current limit system into
The heat of row heat accumulation does not radiate when completing, if the generator terminal for leading to synchronous generator is broken down or disturb again in electric system
Voltage decline, since field regulator is now in stator current limitation system Absent measures, the stator current of synchronous generator
In lesser limitation state of value, then it can not switch to field regulator main ring and carry out encouraging adjusting movement by force, thus the prior art
The brownout that will lead to electric system, causes power system collapse.
Step 306, there are the set end voltage of synchronous generator decline numerical value greater than pre-set in a time step
When threshold value, determine that current working meets the state transfer criterion.
State transfer criterion herein can be indicated by formula (1):
Wherein, UtIndicate the set end voltage of synchronous generator, unit p.u.；T represents time, unit s；When dt is represented
Between step-length；A represents threshold value, unit p.u..Formula hereinIndicate unit time step-length memory in synchronous generator
The set end voltage decline numerical value of machine is greater than pre-set threshold value, then meets state transfer criterion.Wherein time step and door
Threshold value can be preset according to the different operating conditions in electric system scene.
Step 307, when current working meets the state transfer criterion, by stator current limit system link outputting cutting
It is changed to the output of field regulator main ring, to carry out encouraging adjusting movement by force again by field regulator.
It when executing step 307, is equivalent to and has carried out above-mentioned steps 302, i.e., encourage adjusting movement by force, can continue to hold later
Row step 303.
A kind of condition control method of field regulator stator current limitation provided in an embodiment of the present invention, can be in excitation
When the state of adjuster is that stator current limits the output of system link, if electric system, which is broken down or disturbed again, to be caused to synchronize
The set end voltage of generator declines, and can judge whether current working meets the state switching according to a state transfer criterion
Criterion；To stator current limitation system link output be switched to and encouraged when current working meets the state transfer criterion
Magnestat main ring output, to carry out encouraging adjusting movement by force again by field regulator.The present invention can be in Excitation Adjustment in this way
When section device (AVR) is in stator current limiting element (SCL link) control, breaking down or disturb again when electric system causes
The set end voltage of synchronous generator declines, and field regulator can carry out stator current limitation system link output in time and be switched to
Field regulator main ring output movement, thus field regulator can carry out again by force encourage adjusting, ensure that power train
The problem of stability of system avoids the brownout of electric system, causes power system collapse.
The shape that field regulator stator current provided in an embodiment of the present invention is limited below with reference to chart and specific example
State control method is described in further detail.
In order to verify the correctness of the contents of the present invention, the present invention builds simulation model using simulation software DIgSILENT,
The simulation comparison of front and back model is improved, wherein in above-mentioned formula (1), time step 0.02, threshold value 0.1p.u..
The embodiment of the present invention establishes one machine infinity bus system in DIgSILENT software, as shown in Figure 5.It builds simultaneously
Self-definition model structural framing, the frame include synchro generator model, AVR model, governor model, wherein AVR model
Contain SCL link.The mode that SCL link accesses AVR is that low pass is competing than type access.
It is observed by adding identical high-pressure side three phase short circuit fault in DIgSILENT software before and after improving SCL link
The variation of waveform, unmodified SCL Link Model block diagram as shown in fig. 6, improve SCL link after model framework chart as shown in fig. 7,
Wherein the intermediate region of Fig. 7 is the criterion link being added.SCL link partial parameters are as shown in table 1 below:
Table 1:
The time of overcurrent multiple and permission can be indicated with inverse-time curve in SCL.In the simulation model built,
Synchronous generator stator current characteristics expression formula is as follows:
(I2- 1) (2) t=34.5
In formula: I is generator unit stator electric current ItWith stator current heat accumulation initiation value ItthRatio；T is to be permitted under current I
Can duration.
As shown in fig. 6, when system operates normally, SSCL1=0, USCLindOutput valve is greater than UEER, AVR is in main ring controlling party
Formula leads to stator current I in case of certain electric power system fault or disturbancetRise to initiation value ItthWhen, SCL starts hot product
It is accumulative to calculate, work as ItWhen reaching permission duration, SSCL1=1, USCLindOutput valve is less than UEER, it is cut into SCL control.But such as
Fruit electric system is broken down or is disturbed again, if the heat accumulation of SCL link does not clear completely, SSCL1It is always 1, can not cuts
It is encouraged by force at main ring control mode.
And as shown in fig. 7, when SCL is not operating, SSCL1=SSCL2=0, newly-increased criterion does not have an impact SCL.SCL movement
Afterwards, SSCL1=1, at this timeThen according to logical relation, SSCL2=SSCL1=1, newly-increased criterion does not generate shadow to SCL
It rings.Cause when due to the system failureWhen, according to logical relation, if SSCL1=0, SSCL2=0, if SSCL1=
1, SSCL2=0.So increased criterion existsThe control of SCL will not be had an impact, but in SCL movement
In the case of (SSCL1=1) and meet criterionWhen, SCL (S can be exitedSCL2=0).
In one machine infinity bus system, three-phase ground short trouble, as shown in Figure 8, failure are added at the time of t=30s
Moment, generator terminal voltage instantaneously decline, and drop to 0.875p.u. by 1p.u., the AVR of synchronous generator is detected at this time
Brownout is encouraged by force, and set end voltage is raised.Stator current increases with it, and 1.484p.u. is risen to by 1p.u., by Fig. 9
In as it can be seen that after about 42s, SCL movement, stator current starts to return.(according to formula (2), in stator current Ig=1.484p.u.,
ItthWhen=1.1p.u., time inverse time lag 42.07s can be obtained by formula.) stator current return value be 1.087p.u., be less than Itth,
System starts to radiate.
The heat dissipation time is about 102s in SCL model.After t=130s moment, that is, SCL movement when about 58s, add again
Three-phase transient earthing short trouble, at this time SCL heat dissipation do not complete also, and big disturbance, as shown in Figure 8, set end voltage occur again
Decline again, but since SCL is not exited, SSCL10 can not be set, so that output signal USCLindIt is always less than main ring signal, causes
Main ring can not be switched to be encouraged by force again, set end voltage unstability is finally made, large effect is generated to system stability.
And improved model, after adding identical disturbance, the waveform of set end voltage is as shown in Figure 10, stator current
Waveform is as shown in figure 11.Before 130s, variation tendency and when not improving variation it is the same, but in the generation of failure again, such as
Shown in Figure 10, in instant of failure, voltage equally drops into 0.6p.u., due to be added to it is secondary encourage link by force, meet criterionSCL is exited, and is switched to main ring control, and AVR is encouraged by force again, and stator current rises to 1.484p.u. again, this
When do not cleared also due to heat before, the accumulation of heat still under limiter monitoring, after about 21s, SCL movement starts to return, and returns
It returns value 1.084p.u. and is less than 1.1p.u., start again at heat dissipation.
It is compared by Fig. 8,9 and Figure 10,11 it is found that, when heat does not clear, occurring again not plus in improvement link
Failure can not encourage by force again since SCL cannot switch to main ring, may generate unstable phenomenon, damage to system.
And improved model of the invention such as meets criterion after encountering disturbance againThen SCL switches to master
Ring, AVR are encouraged by force again, at this point, system operational excellence, guarantees the safety of power grid.Comparison is it is found that improved model enhances system
Stability.As it can be seen that it is increased it is secondary by force encourage link can make unit SCL movement after still have it is appropriate encourage ability by force, mention
Rise the stabilizing power of electric system in a low voltage state.
Corresponding to embodiment of the method corresponding to above-mentioned Fig. 3 and Fig. 4, as shown in figure 12, the embodiment of the present invention also provides one
The behavior control device of kind field regulator stator current limitation, comprising:
Malfunction monitoring unit 41, for field regulator operate normally when, monitoring electric system whether break down or
Disturbance causes the set end voltage of synchronous generator to decline.
Regulation unit 42 is encouraged by force, causes the generator terminal of synchronous generator electric for breaking down or disturbing in electric system
When drops, carries out encouraging adjusting movement by force by field regulator, so that the stator current of synchronous generator increases, meet stator
After current limit criterion, the output of field regulator main ring is switched to stator current limitation system link output.
Judging unit 43, when limiting the output of system link for the state in field regulator for stator current, and electric power
System is broken down or is disturbed again when the set end voltage of synchronous generator being caused to decline, according to a state transfer criterion, judgement
Whether current working meets the state transfer criterion.
Status toggle unit 44, for when current working meets the state transfer criterion, stator current to be limited system
System link output is switched to the output of field regulator main ring, to carry out encouraging adjusting movement by force again by field regulator.
Specifically, as shown in figure 13, it is described to encourage regulation unit 42 by force, comprising:
It encourages by force and adjusts control module 421, lead to the generator terminal of synchronous generator for breaking down or disturbing in electric system
When voltage declines, carry out encouraging adjusting movement by force by field regulator, so that the stator current of synchronous generator increases.
Heat accumulation computing module 422, for monitoring the stator current of synchronous generator, and in the stator of synchronous generator
When electric current reaches pre-set stator current limitation system start up value, system is limited according to the synchronous hair by stator current
The stator current of motor carries out heat accumulation calculating.
Radiate computing module 423, and the heat accumulation value for carrying out heat accumulation in stator current limitation system reaches preparatory
When the stator current of setting limits system maximum permissible value, the output of field regulator main ring is switched to stator current limitation system
Link output is set in the return value lower than described in advance so that the stator current of synchronous generator is reduced to a return value
When the stator current limitation system start up value set, system is limited by stator current and carries out heat dissipation calculating.
In addition, the judging unit 43, is specifically used for:
Determine stator current limitation system carry out heat accumulation heat do not radiate complete when, electric system occurs again
Failure or disturbance cause the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judge whether current working is full
The foot state transfer criterion.
In addition, the judging unit 43, is specifically used for:
The set end voltage of synchronous generator is obtained in real time.
And according to pre-set time step, the generator terminal electricity in a time step with the presence or absence of synchronous generator is determined
Drops numerical value is greater than pre-set threshold value.
When being greater than pre-set threshold value there are the set end voltage of synchronous generator decline numerical value in a time step,
Determine that current working meets the state transfer criterion.
A kind of behavior control device of field regulator stator current limitation provided in an embodiment of the present invention, can be in excitation
When the state of adjuster is that stator current limits the output of system link, if electric system, which is broken down or disturbed again, to be caused to synchronize
The set end voltage of generator declines, and can judge whether current working meets the state switching according to a state transfer criterion
Criterion；To stator current limitation system link output be switched to and encouraged when current working meets the state transfer criterion
Magnestat main ring output, to carry out encouraging adjusting movement by force again by field regulator.The present invention can be in Excitation Adjustment in this way
When section device (AVR) is in stator current limiting element (SCL link) control, breaking down or disturb again when electric system causes
The set end voltage of synchronous generator declines, and field regulator can carry out stator current limitation system link output in time and be switched to
Field regulator main ring output movement, thus field regulator can carry out again by force encourage adjusting, ensure that power train
The problem of stability of system avoids the brownout of electric system, causes power system collapse.
In one embodiment, the embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with calculating
Machine program, the program perform the steps of when being executed by processor
When field regulator operates normally, whether monitoring electric system is broken down or is disturbed and lead to synchronous generator
Set end voltage decline.
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, pass through field regulator
It carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, by Excitation Adjustment
Section device main ring output is switched to stator current limitation system link output.
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down again
Or disturbance causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges whether current working meets institute
State state transfer criterion.
When current working meets the state transfer criterion, stator current limitation system link output is switched to excitation
Adjuster main ring output, to carry out encouraging adjusting movement by force again by field regulator.
In addition, in one embodiment, the embodiment of the present invention also provides a kind of computer equipment, including memory, processor
And it is stored in the computer program that storage is upper and can run on a processor, the processor is realized following when executing described program
Step:
When field regulator operates normally, whether monitoring electric system is broken down or is disturbed and lead to synchronous generator
Set end voltage decline.
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, pass through field regulator
It carries out encouraging adjusting movement by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, by Excitation Adjustment
Section device main ring output is switched to stator current limitation system link output.
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down again
Or disturbance causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges whether current working meets institute
State state transfer criterion.
When current working meets the state transfer criterion, stator current limitation system link output is switched to excitation
Adjuster main ring output, to carry out encouraging adjusting movement by force again by field regulator.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (7)
1. a kind of condition control method of field regulator stator current limitation characterized by comprising
When field regulator operates normally, the generator terminal for leading to synchronous generator is broken down or disturbed to monitoring electric system whether
Voltage decline；
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, carried out by field regulator
Adjusting movement is encouraged by force, so that the stator current of synchronous generator increases,
After meeting stator current limitation criterion, that is, the stator current of synchronous generator is monitored, and in the stator of synchronous generator electricity
When stream reaches pre-set stator current limitation system start up value, system is limited according to the synchronous generator by stator current
The stator current of machine carries out heat accumulation calculating；
Reach pre-set stator current limitation system most in the heat accumulation value that stator current limitation system carries out heat accumulation
When big permissible value, the output of field regulator main ring is switched to stator current limitation system link output；
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down or is disturbed again
It is dynamic that the set end voltage of synchronous generator is caused to decline, according to a state transfer criterion, judge whether current working meets the shape
State transfer criterion；
When current working meets the state transfer criterion, stator current limitation system link output is switched to adjustment of field excitation
Device main ring output, to carry out encouraging adjusting movement by force again by field regulator；
It is described according to a state transfer criterion, judge whether current working meets the state transfer criterion, comprising:
The set end voltage of synchronous generator is obtained in real time；
And according to pre-set time step, determine in a time step with the presence or absence of under the set end voltage of synchronous generator
It drops numerical value and is greater than pre-set threshold value；
When being greater than pre-set threshold value there are the set end voltage of synchronous generator decline numerical value in a time step, determine
Current working meets the state transfer criterion.
2. the condition control method of field regulator stator current limitation according to claim 1, which is characterized in that described
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, encouraged by force by field regulator
Adjusting movement, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, by field regulator main ring
Output is switched to stator current limitation system link output, comprising:
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, carried out by field regulator
Adjusting movement is encouraged by force, so that the stator current of synchronous generator increases；
The stator current of synchronous generator is monitored, and reaches pre-set stator current limit in the stator current of synchronous generator
When system start up value processed, system is limited by stator current, heat accumulation meter is carried out according to the stator current of the synchronous generator
It calculates；
Reach pre-set stator current limitation system most in the heat accumulation value that stator current limitation system carries out heat accumulation
When big permissible value, the output of field regulator main ring is switched to stator current limitation system link output, so that synchronous generator
The stator current of machine is reduced to a return value, in the return value lower than the pre-set stator current limitation system starting
When value, system is limited by stator current and carries out heat dissipation calculating.
3. the condition control method of field regulator stator current limitation according to claim 2, which is characterized in that described
When the state of field regulator is that stator current limits the output of system link, led if electric system is broken down or disturbed again
The set end voltage decline for causing synchronous generator, according to a state transfer criterion, judges whether current working meets the state and cut
Change criterion, comprising:
Determine stator current limitation system carry out heat accumulation heat do not radiate complete when, electric system is broken down again
Or disturbance causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges whether current working meets institute
State state transfer criterion.
4. a kind of behavior control device of field regulator stator current limitation characterized by comprising
Malfunction monitoring unit is used for when field regulator operates normally, and whether monitoring electric system, which is broken down or disturbed, is led
Cause the set end voltage decline of synchronous generator；
Regulation unit is encouraged by force, causes the set end voltage of synchronous generator to decline for breaking down or disturbing in electric system
When, it carries out encouraging adjusting movement by force by field regulator, so that the stator current of synchronous generator increases,
After meeting stator current limitation criterion, that is, the stator current of synchronous generator is monitored, and in the stator of synchronous generator electricity
When stream reaches pre-set stator current limitation system start up value, system is limited according to the synchronous generator by stator current
The stator current of machine carries out heat accumulation calculating；
Reach pre-set stator current limitation system most in the heat accumulation value that stator current limitation system carries out heat accumulation
When big permissible value, the output of field regulator main ring is switched to stator current limitation system link output；
Judging unit, when limiting the output of system link for the state in field regulator for stator current, and electric system is again
It is secondary break down or disturb cause synchronous generator set end voltage decline when, according to a state transfer criterion, judge current work
Whether condition meets the state transfer criterion；
Status toggle unit, for when current working meets the state transfer criterion, stator current to be limited system link
Output is switched to the output of field regulator main ring, to carry out encouraging adjusting movement by force again by field regulator；
The judging unit, is specifically used for:
Determine stator current limitation system carry out heat accumulation heat do not radiate complete when, electric system is broken down again
Or disturbance causes the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges whether current working meets institute
State state transfer criterion；
The judging unit, is specifically used for:
The set end voltage of synchronous generator is obtained in real time；
And according to pre-set time step, determine in a time step with the presence or absence of under the set end voltage of synchronous generator
It drops numerical value and is greater than pre-set threshold value；
When being greater than pre-set threshold value there are the set end voltage of synchronous generator decline numerical value in a time step, determine
Current working meets the state transfer criterion.
5. the behavior control device of field regulator stator current limitation according to claim 4, which is characterized in that described
Regulation unit is encouraged by force, comprising:
Adjusting control module is encouraged by force, causes the set end voltage of synchronous generator to decline for breaking down or disturbing in electric system
When, it carries out encouraging adjusting movement by force by field regulator, so that the stator current of synchronous generator increases；
Heat accumulation computing module is reached for monitoring the stator current of synchronous generator, and in the stator current of synchronous generator
When limiting system start up value to pre-set stator current, system is limited according to the synchronous generator by stator current
Stator current carries out heat accumulation calculating；
Radiate computing module, and the heat accumulation value for carrying out heat accumulation in stator current limitation system reaches pre-set fixed
When electron current limits system maximum permissible value, it is defeated that the output of field regulator main ring is switched to stator current limitation system link
Out, so that the stator current of synchronous generator is reduced to a return value, in the return value lower than described pre-set fixed
When electron current limits system start up value, system is limited by stator current and carries out heat dissipation calculating.
6. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
It is performed the steps of when row
When field regulator operates normally, the generator terminal for leading to synchronous generator is broken down or disturbed to monitoring electric system whether
Voltage decline；
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, carried out by field regulator
Adjusting movement is encouraged by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, i.e. monitoring synchronizes hair
The stator current of motor, and reach pre-set stator current limitation system start up value in the stator current of synchronous generator
When, system is limited by stator current, heat accumulation calculating is carried out according to the stator current of the synchronous generator；
Reach pre-set stator current limitation system most in the heat accumulation value that stator current limitation system carries out heat accumulation
When big permissible value, the output of field regulator main ring is switched to stator current limitation system link output；
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down or is disturbed again
It is dynamic that the set end voltage of synchronous generator is caused to decline, according to a state transfer criterion, judge whether current working meets the shape
State transfer criterion；
When current working meets the state transfer criterion, stator current limitation system link output is switched to adjustment of field excitation
Device main ring output, to carry out encouraging adjusting movement by force again by field regulator；
It is described according to a state transfer criterion, judge whether current working meets the state transfer criterion, comprising:
The set end voltage of synchronous generator is obtained in real time；
And according to pre-set time step, determine in a time step with the presence or absence of under the set end voltage of synchronous generator
It drops numerical value and is greater than pre-set threshold value；
When being greater than pre-set threshold value there are the set end voltage of synchronous generator decline numerical value in a time step, determine
Current working meets the state transfer criterion.
7. a kind of computer equipment including memory, processor and is stored in the calculating that storage is upper and can run on a processor
Machine program, which is characterized in that the processor performs the steps of when executing described program
When field regulator operates normally, the generator terminal for leading to synchronous generator is broken down or disturbed to monitoring electric system whether
Voltage decline；
When electric system, which is broken down or disturbed, causes the set end voltage of synchronous generator to decline, carried out by field regulator
Adjusting movement is encouraged by force, so that the stator current of synchronous generator increases, after meeting stator current limitation criterion, i.e. monitoring synchronizes hair
The stator current of motor, and reach pre-set stator current limitation system start up value in the stator current of synchronous generator
When, system is limited by stator current, heat accumulation calculating is carried out according to the stator current of the synchronous generator；
Reach pre-set stator current limitation system most in the heat accumulation value that stator current limitation system carries out heat accumulation
When big permissible value, the output of field regulator main ring is switched to stator current limitation system link output；
When the state of field regulator is that stator current limits the output of system link, if electric system is broken down or is disturbed again
It is dynamic that the set end voltage of synchronous generator is caused to decline, according to a state transfer criterion, judge whether current working meets the shape
State transfer criterion；
When current working meets the state transfer criterion, stator current limitation system link output is switched to adjustment of field excitation
Device main ring output, to carry out encouraging adjusting movement by force again by field regulator；
It is described according to a state transfer criterion, judge whether current working meets the state transfer criterion, comprising:
The set end voltage of synchronous generator is obtained in real time；
And according to pre-set time step, determine in a time step with the presence or absence of under the set end voltage of synchronous generator
It drops numerical value and is greater than pre-set threshold value；
When being greater than pre-set threshold value there are the set end voltage of synchronous generator decline numerical value in a time step, determine
Current working meets the state transfer criterion.
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| CN108681817B (en) * | 2018-05-17 | 2021-08-06 | 中电普瑞电力工程有限公司 | Excitation system performance evaluation method and device and storage medium |
| CN109088443B (en) * | 2018-08-13 | 2020-06-05 | 华北电力科学研究院有限责任公司 | Over-excitation limit optimization method and system for excitation regulator |
| CN112952784A (en) * | 2021-02-24 | 2021-06-11 | 国网浙江省电力有限公司电力科学研究院 | Excitation becomes overload limiter suitable for flexible excitation system |
| CN114070141A (en) * | 2020-07-31 | 2022-02-18 | 上海梅山钢铁股份有限公司 | Control device for avoiding impact of reactive disturbance on small generator |
| CN113419587A (en) * | 2021-06-28 | 2021-09-21 | 国家电网有限公司华东分部 | Device and method for stabilizing voltage of power system |
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| CN102064757B (en) * | 2010-12-24 | 2012-11-07 | 中国长江三峡集团公司 | Generator accident reinforced excitation circuit |
| CN102255594A (en) * | 2011-08-05 | 2011-11-23 | 国电南瑞科技股份有限公司 | Main and auxiliary link cooperative control method for generator excitation system |
| CN103051265A (en) * | 2012-12-26 | 2013-04-17 | 浙江大学 | Power generator forced excitation control method under condition of power system faults |
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