CN107834922A - 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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- CN107834922A CN107834922A CN201711090213.8A CN201711090213A CN107834922A CN 107834922 A CN107834922 A CN 107834922A CN 201711090213 A CN201711090213 A CN 201711090213A CN 107834922 A CN107834922 A CN 107834922A
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- Prior art keywords
- stator current
- synchronous generator
- field regulator
- end voltage
- state transfer
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- 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 invention provides the condition control method and device of a kind of field regulator stator current limitation, it is related to Operation of Electric Systems and security technology area.Method includes：In field regulator normal operation, when the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, carry out encouraging regulation action by force by field regulator, so that the stator current increase of synchronous generator, it is that stator current limits the output of system link by field regulator main ring output switching after meeting stator current limitation criterion；When the state of field regulator limits the output of system link for stator current, cause the set end voltage of synchronous generator to decline if power 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 is limited into system link output switching and exported for field regulator main ring, to be encouraged regulation action by force again by field regulator.
Description
Technical field
The present invention relates to Operation of Electric Systems and security technology area, more particularly to a kind of field regulator stator current to limit
The condition control method and device of system.
Background technology
With the development of China's power system, the structure and the method for operation of power system are increasingly sophisticated, power system it is steady
Qualitative question is more and more important.At present, the exciter control system of synchronous generator is considered as raising and improves electric power system stability
Qualitative most economical maximally 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 establish magnetic field to the magnetic field winding of synchronous generator 20, 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 collection) control exciting power unit 101 output,
Reach the purpose of regulation exciting current, for maintaining the voltage constant of synchronous generator 20, meet safe operation of power system
Need.Field regulator completes maintenance voltage level, there is provided while reactive power, can be carried by increasing auxiliary limiting element
The safety of high exciter control system, obtain more excellent control performance.Therefore the research of excitation system auxiliary limitation is to generator
The stable operation of itself or even power 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 rings can be with
As shown in Fig. 2 wherein UEERThe departure of set end voltage and set-point is represented, it is exported for AVR main rings, USCLindFor SCL links
Output, LV are that low pass compares door, and PID is AVR Controlling models, UAExported for AVR, for being output to exciting power unit.
The course of work of mode of stator current limitation intervention main ring is：During AVR normal operations, AVR main rings work, and
SCL links do not work.The set end voltage of synchronous generator is caused to decline if certain failure or disturbance occur for power system,
AVR can be encouraged regulation by force, after meeting SCL link criterions, so as to which AVR can be switched to SCL links by AVR main rings.It is but existing
It is, when AVR is now in SCL Absent measures, to be led if power system is broken down or disturbed again with the presence of the problem of technology
Cause the set end voltage of synchronous generator to decline, then AVR can not carry out again it is strong encourage regulation, cause the voltage mistake of power system
It is low, cause power system collapse.
The content of the invention
Embodiments of the invention provide a kind of condition control method and device of the limitation of field regulator stator current, with solution
When certainly AVR is in SCL Absent measures, if power system is broken down or disturbed again under the set end voltage for causing synchronous generator
Drop, then AVR can not carry out again it is strong encourage regulation, cause the brownout of power system, cause asking for power system collapse
Topic.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that：
A kind of condition control method of field regulator stator current limitation, including：
In field regulator normal operation, whether monitoring power system is broken down or is disturbed and cause synchronous generator
Set end voltage declines；
When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, pass through field regulator
Carry out encouraging regulation action by force so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by Excitation Adjustment
It is that stator current limits the output of system link to save device main ring output switching；
When the state of field regulator limits the output of system link for stator current, if power 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；
It is excitation by stator current limitation system link output switching when current working meets the state transfer criterion
Adjuster main ring exports, to be encouraged regulation action by force again by field regulator.
Specifically, it is described when the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, lead to
Overexcitation adjuster carries out encouraging regulation action by force so that the stator current increase of synchronous generator, meets that stator current limitation is sentenced
It is that stator current limits the output of system link by field regulator main ring output switching according to rear, including：
When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, pass through field regulator
Carry out encouraging regulation action by force so that the stator current increase of synchronous generator；
Monitor synchronous generator stator current, and synchronous generator stator current reach pre-set stator electricity
During ductility limit system start up value, system is limited by stator current and tired out according to the stator current of synchronous generator progress heat
Meter calculates；
Reach the stator current limitation system pre-set in the heat accumulation value of stator current limitation system progress heat accumulation
It is that stator current limits the output of system link by field regulator main ring output switching, to cause synchronization during system maximum permissible value
The stator current of generator is reduced to a return value, and system is limited less than the stator current pre-set in the return value
During initiation value, system is limited by stator current and carries out radiating calculating.
Specifically, when the state in field regulator is stator current limitation system link output, if power 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, including：
In the completion it is determined that the heat of stator current limitation system progress heat accumulation does not radiate, power 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, it is described according to a state transfer criterion, judge whether current working meets the state transfer criterion, wrap
Include：
The set end voltage of synchronous generator is obtained in real time；
And according to the time step pre-set, it is determined that with the presence or absence of the generator terminal electricity of synchronous generator in a time step
Drops numerical value is more than the threshold value pre-set；
When the set end voltage that synchronous generator in a time step be present declines numerical value more than the threshold value pre-set,
Determine that current working meets the state transfer criterion.
A kind of behavior control device of field regulator stator current limitation, including：
Malfunction monitoring unit, in field regulator normal operation, whether monitoring power system to be broken down or disturbed
It is dynamic to cause the set end voltage of synchronous generator to decline；
Regulation unit is encouraged by force, causes the set end voltage of synchronous generator for breaking down or disturbing in power system
During decline, carry out encouraging regulation action by force by field regulator so that the stator current increase of synchronous generator, meet stator electricity
It is that stator current limits the output of system link by field regulator main ring output switching after ductility limit criterion；
Judging unit, for when the state of field regulator limits the output of system link for stator current, and power train
System is broken down or disturbed again when causing the set end voltage of synchronous generator to decline, and according to a state transfer criterion, judges to work as
Whether preceding operating mode meets the state transfer criterion；
Status toggle unit, for when current working meets the state transfer criterion, stator current to be limited into system
Link output switching exports for field regulator main ring, to be encouraged regulation action by force again by field regulator.
Specifically, described encourage regulation unit by force, including：
Adjustment control module is encouraged by force, causes the set end voltage of synchronous generator for breaking down or disturbing in power system
During decline, carry out encouraging regulation action by force by field regulator so that the stator current increase of synchronous generator；
Heat accumulation computing module, for monitoring the stator current of synchronous generator, and in the stator electricity of synchronous generator
When stream reaches the stator current limitation system start up value pre-set, system is limited according to the synchronous generator by stator current
The stator current of machine carries out heat accumulation calculating；
Radiated computing module, and the heat accumulation value for carrying out heat accumulation in stator current limitation system, which reaches, to be pre-set
Stator current limitation system maximum permissible value when, by field regulator main ring output switching be stator current limit system link
Output, to cause the stator current of synchronous generator to be reduced to a return value, pre-set in the return value less than described in
When stator current limits system start up value, system is limited by stator current and carries out radiating calculating.
In addition, the judging unit, is specifically used for：
In the completion it is determined that the heat of stator current limitation system progress heat accumulation does not radiate, power 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 the time step pre-set, it is determined that with the presence or absence of the generator terminal electricity of synchronous generator in a time step
Drops numerical value is more than the threshold value pre-set；
When the set end voltage that synchronous generator in a time step be present declines numerical value more than the threshold value pre-set,
Determine that current working meets the state transfer criterion.
A kind of computer-readable recording medium, is stored thereon with computer program, and the program is realized when being executed by processor
Following steps：
In field regulator normal operation, whether monitoring power system is broken down or is disturbed and cause synchronous generator
Set end voltage declines；
When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, pass through field regulator
Carry out encouraging regulation action by force so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by Excitation Adjustment
It is that stator current limits the output of system link to save device main ring output switching；
When the state of field regulator limits the output of system link for stator current, if power 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；
It is excitation by stator current limitation system link output switching when current working meets the state transfer criterion
Adjuster main ring exports, to be encouraged regulation action by force again by field regulator.
A kind of computer equipment, including memory, processor and the meter that is stored in storage above and can run on a processor
Calculation machine program, following steps are realized during the computing device described program：
In field regulator normal operation, whether monitoring power system is broken down or is disturbed and cause synchronous generator
Set end voltage declines；
When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, pass through field regulator
Carry out encouraging regulation action by force so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by Excitation Adjustment
It is that stator current limits the output of system link to save device main ring output switching；
When the state of field regulator limits the output of system link for stator current, if power 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；
It is excitation by stator current limitation system link output switching when current working meets the state transfer criterion
Adjuster main ring exports, to be encouraged regulation action 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 limits the output of system link for stator current, led if power system is broken down or disturbed again
Cause the set end voltage of synchronous generator to decline, can judge whether current working meets the shape according to a state transfer criterion
State transfer criterion；So as to which when current working meets the state transfer criterion, stator current is limited into system link outputting cutting
The output of field regulator main ring is changed to, to be encouraged regulation action by force again by field regulator.So present invention can be
When field regulator (AVR) is in stator current limiting element (SCL links) control, when power system is broken down or disturbed again
Dynamic to cause the set end voltage of synchronous generator to decline, field regulator can carry out stator current limitation system link output in time
The action for switching to field regulator main ring to export, so as to field regulator can carry out again it is strong encourage regulation, avoid electricity
The brownout of Force system, the problem of causing power system collapse.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic diagram of the exciter control system of synchronous generator of the prior art；
Fig. 2 is the schematic diagram that stator current limitation gets involved in AVR main rings；
Fig. 3 is a kind of flow 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 flow 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 softwares；
Fig. 6 is the schematic diagram of unmodified SCL Link Models in the prior art；
Fig. 7 is the model schematic of the SCL links after the improvement in the embodiment of the present invention；
Fig. 8 is the simulation curve of set end voltage of the prior art；
Fig. 9 is the simulation curve of stator current of 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.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the 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, bag
Include：
Step 201, in field regulator normal operation, whether monitoring power system is broken down or is disturbed and cause synchronization
The set end voltage of generator declines.
Step 202, in power system break down or disturb when causing the set end voltage of synchronous generator to decline, by encouraging
Magnestat carries out encouraging regulation action by force so that the stator current increase of synchronous generator, after meeting stator current limitation criterion,
It is that stator current limits the output of system link by field regulator main ring output switching.
Step 203, when the state of field regulator limits the output of system link for stator current, if power 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
The output of field regulator main ring is changed to, to be encouraged regulation action 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 power system, which is broken down or disturbed again, causes synchronization
The set end voltage of generator declines, and can judge whether current working meets the state switching according to a state transfer criterion
Criterion；So as to which when current working meets the state transfer criterion, stator current is limited into system link output switching to encourage
Magnestat main ring exports, to be encouraged regulation action by force again by field regulator.So the present invention can be in Excitation Adjustment
When section device (AVR) is in stator current limiting element (SCL links) control, breaking down or disturb again when power system causes
The set end voltage of synchronous generator declines, and field regulator can carry out stator current limitation system link output switching in time and be
The action of field regulator main ring output, so as to field regulator can carry out again it is strong encourage regulation, avoid power system
Brownout, the problem of causing power system collapse.
In order that those skilled in the art is 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, including：
Step 301, in field regulator normal operation, field regulator state is the output of field regulator main ring, fixed
Electron current limitation system link does not work, and the generator terminal for causing synchronous generator is broken down or disturbed to monitoring power system whether
Voltage declines.
Step 302, in power system break down or disturb when causing the set end voltage of synchronous generator to decline, by encouraging
Magnestat carries out encouraging regulation action by force so that the stator current increase of synchronous generator.
Step 303, the stator current for monitoring synchronous generator, and reach and pre-set in the stator current of synchronous generator
Stator current limitation system start up value when, by stator current limit system entered according to the stator current of the synchronous generator
Row heat accumulation calculates.
Step 304, stator current limitation system carry out heat accumulation heat accumulation value reach pre-set stator electricity
It is that stator current limits the output of system link by field regulator main ring output switching during ductility limit system maximum permissible value, with
So that the stator current of synchronous generator is reduced to a return value, in the return value less than the stator current pre-set
When limiting system start up value, system is limited by stator current and carries out radiating calculating.
Step 305, it is determined that stator current limitation system carry out heat accumulation heat do not radiate completion when, power 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 the time step pre-set, it is determined that the set end voltage with the presence or absence of synchronous generator in a time step declines number
Value is more than the threshold value pre-set.
Herein, compared with prior art, generally, the heat that heat accumulation is carried out in stator current limitation system dissipates
When heat is completed (heat all disperses), it is defeated just field regulator main ring to be gained by stator current limitation system link outputting cutting
Go out.And prior art does not use above-mentioned steps 305 and follow-up step 306 and step 307, then enter in stator current limitation system
The heat of row heat accumulation do not radiate completion when, if the generator terminal for causing synchronous generator is broken down or disturbed again in power system
Voltage declines, because field regulator is now in stator current limitation system Absent measures, the stator current of synchronous generator
In less limitation state of value, then it can not switch to field regulator main ring and carry out encouraging regulation action by force, so as to prior art
The brownout of power system can be caused, cause power system collapse.
Step 306, the set end voltage decline numerical value that synchronous generator be present in a time step are more than what is pre-set
During threshold value, determine that current working meets the state transfer criterion.
State transfer criterion herein can be represented by formula (1)：
Wherein, UtRepresent 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 hereinRepresent unit interval step-length internal memory in synchronous generator
The set end voltage of machine declines numerical value and is more than the threshold value pre-set, then meets state transfer criterion.Wherein time step and door
Threshold value can be preset according to the different operating modes in power system scene.
Step 307, when current working meets the state transfer criterion, by stator current limit system link outputting cutting
The output of field regulator main ring is changed to, to be encouraged regulation action by force again by field regulator.
When performing step 307, equivalent to above-mentioned steps 302 have been carried out, i.e., regulation action is encouraged by force, can continue to hold afterwards
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 power system, which is broken down or disturbed again, causes synchronization
The set end voltage of generator declines, and can judge whether current working meets the state switching according to a state transfer criterion
Criterion；So as to which when current working meets the state transfer criterion, stator current is limited into system link output switching to encourage
Magnestat main ring exports, to be encouraged regulation action by force again by field regulator.So the present invention can be in Excitation Adjustment
When section device (AVR) is in stator current limiting element (SCL links) control, breaking down or disturb again when power system causes
The set end voltage of synchronous generator declines, and field regulator can carry out stator current limitation system link output switching in time and be
The action of field regulator main ring output, so as to field regulator can carry out again it is strong encourage regulation, ensure that power train
The stability of system, the brownout of power system is avoided, the problem of causing power system collapse.
The shape limited with reference to chart and specific example field regulator stator current provided in an embodiment of the present invention
State control method is described in further detail.
In order to verify the correctness of present disclosure, the present invention builds simulation model using simulation software DIgSILENT,
The simulation comparison of front and rear 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 softwares, as shown in Figure 5.Build simultaneously
Self-definition model structural framing, the framework include synchro generator model, AVR models, wherein governor model, AVR models
Contain SCL links.SCL links access AVR mode accesses for low pass is competing than type.
Observed by adding identical high-pressure side three phase short circuit fault in DIgSILENT softwares before and after improvement SCL links
The change of waveform, unmodified SCL Link Models block diagram as shown in fig. 6, improve SCL links after model framework chart as shown in fig. 7,
Wherein Fig. 7 intermediate region is the criterion link added.SCL link partial parameters are as shown in table 1 below：
Table 1：
Overcurrent multiple can be represented with the time allowed with inverse-time curve in SCL.In the simulation model built,
Synchronous generator stator current characteristics expression formula is as follows：
(I2- 1) t=34.5 (2)
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, during system normal operation, SSCL1=0, USCLindOutput valve is more than UEER, AVR is in main ring controlling party
Formula, in the event of certain electric power system fault or disturbance, cause stator current ItRise 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 controls.But such as
Fruit power system is broken down or disturbed again, if the heat accumulation of SCL links does not clear completely, SSCL1It is always 1, can not cuts
Encouraged by force into 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 to SCL.SCL is acted
Afterwards, SSCL1=1, nowThen according to logical relation, SSCL2=SSCL1=1, newly-increased criterion does not produce shadow to SCL
Ring.Cause when due to the system failureWhen, according to logical relation, if SSCL1=0, SSCL2=0, if SSCL1=
1, SSCL2=0.So increased criterion existsSCL control will not be had an impact, but in SCL actions
In the case of (SSCL1=1) and criterion is metWhen, 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., now the AVR of synchronous generator is detected
Brownout, encouraged by force, raise set end voltage.Stator current increases therewith, 1.484p.u. is risen to by 1p.u., by Fig. 9
In it is visible, after about 42s, SCL actions, stator current starts to return.(according to formula (2), in stator current Ig=1.484p.u.,
ItthDuring=1.1p.u., time inverse time lag 42.07s can be obtained by formula.) stator current return value is 1.087p.u., less than Itth,
System starts to radiate.
The radiating time is about 102s in SCL models.When being about 58s after SCL is acted at the t=130s moment, add again
Three-phase transient earthing short trouble, now SCL radiatings do not complete also, and big disturbance, as shown in Figure 8, set end voltage occur again
Decline again, but because SCL is not exited, SSCL1It can not set to 0 so that output signal USCLindIt is less than main ring signal always, causes
Main ring can not be switched to be encouraged by force again, finally cause set end voltage unstability, large effect is produced to the stability of a system.
And the model after improving, after addition 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 change, but when failure again occurs, such as
Shown in Figure 10, in instant of failure, voltage equally drops into 0.6p.u., due to the addition of 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 actions start to return, and return
Return value 1.084p.u. and be less than 1.1p.u., start again at radiating.
Contrasted from Fig. 8,9 and Figure 10,11, not plus in improvement link, when heat does not clear, occurred again
Failure, because SCL can not switch to main ring, it is impossible to encourage by force again, unstable phenomenon may be produced, caused damage to system.
And the model after the improvement of the present invention, after disturbance is run into again, such as meet criterionThen SCL switches to master
Ring, AVR are encouraged by force again, and now, system operation is good, ensure the safety of power network.Contrast understands that improved model enhances system
Stability.It can be seen that it is increased it is secondary it is strong encourage link can make unit still possess after SCL actions it is appropriate it is strong encourage ability, carry
Rise the stabilizing power of power system in a low voltage state.
Corresponding to the 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, including：
Malfunction monitoring unit 41, in field regulator normal operation, monitoring power 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 power system
During drops, carry out encouraging regulation action by force by field regulator so that the stator current increase of synchronous generator, meet stator
It is that stator current limits the output of system link by field regulator main ring output switching after current limit criterion.
Judging unit 43, for when the state of field regulator limits the output of system link for stator current, and electric power
System is broken down or disturbed again when causing the set end voltage of synchronous generator to decline, and according to a state transfer criterion, is judged
Whether current working meets the state transfer criterion.
Status toggle unit 44, it is for when current working meets the state transfer criterion, stator current to be limited
Link output switching of uniting exports for field regulator main ring, to be encouraged regulation action by force again by field regulator.
Specifically, as shown in figure 13, it is described to encourage regulation unit 42 by force, including：
Adjustment control module 421 is encouraged by force, causes the generator terminal of synchronous generator for breaking down or disturbing in power system
When voltage declines, carry out encouraging regulation action by force by field regulator so that the stator current increase of synchronous generator.
Heat accumulation computing module 422, for monitoring the stator current of synchronous generator, and in the stator of synchronous generator
When electric current reaches the stator current limitation system start up value pre-set, 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 advance
It is that stator current limits system by field regulator main ring output switching during the stator current limitation system maximum permissible value of setting
Link exports, and to cause the stator current of synchronous generator to be reduced to a return value, is set in advance less than described in the return value
During the stator current limitation system start up value put, system is limited by stator current and carries out radiating calculating.
In addition, the judging unit 43, is specifically used for：
In the completion it is determined that the heat of stator current limitation system progress heat accumulation does not radiate, power 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 the time step pre-set, it is determined that with the presence or absence of the generator terminal electricity of synchronous generator in a time step
Drops numerical value is more than the threshold value pre-set.
When the set end voltage that synchronous generator in a time step be present declines numerical value more than the threshold value pre-set,
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 power system, which is broken down or disturbed again, causes synchronization
The set end voltage of generator declines, and can judge whether current working meets the state switching according to a state transfer criterion
Criterion；So as to which when current working meets the state transfer criterion, stator current is limited into system link output switching to encourage
Magnestat main ring exports, to be encouraged regulation action by force again by field regulator.So the present invention can be in Excitation Adjustment
When section device (AVR) is in stator current limiting element (SCL links) control, breaking down or disturb again when power system causes
The set end voltage of synchronous generator declines, and field regulator can carry out stator current limitation system link output switching in time and be
The action of field regulator main ring output, so as to field regulator can carry out again it is strong encourage regulation, ensure that power train
The stability of system, the brownout of power system is avoided, the problem of causing power system collapse.
In one embodiment, the embodiment of the present invention also provides a kind of computer-readable recording medium, is stored thereon with calculating
Machine program, the program realize following steps when being executed by processor：
In field regulator normal operation, whether monitoring power system is broken down or is disturbed and cause synchronous generator
Set end voltage declines.
When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, pass through field regulator
Carry out encouraging regulation action by force so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by Excitation Adjustment
It is that stator current limits the output of system link to save device main ring output switching.
When the state of field regulator limits the output of system link for stator current, if power 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.
It is excitation by stator current limitation system link output switching when current working meets the state transfer criterion
Adjuster main ring exports, to be encouraged regulation action 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 the computer program that storage is upper and can run on a processor is stored in, realize during the computing device described program following
Step：
In field regulator normal operation, whether monitoring power system is broken down or is disturbed and cause synchronous generator
Set end voltage declines.
When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, pass through field regulator
Carry out encouraging regulation action by force so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by Excitation Adjustment
It is that stator current limits the output of system link to save device main ring output switching.
When the state of field regulator limits the output of system link for stator current, if power 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.
It is excitation by stator current limitation system link output switching when current working meets the state transfer criterion
Adjuster main ring exports, to be encouraged regulation action by force again by field regulator.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
According to the thought of the present invention, there will be changes in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
- A kind of 1. condition control method of field regulator stator current limitation, it is characterised in that including：In field regulator normal operation, the generator terminal for causing synchronous generator is broken down or disturbed to monitoring power system whether Voltage declines；When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, carried out by field regulator It is strong to encourage regulation action so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by field regulator Main ring output switching is that stator current limits the output of system link；When the state of field regulator limits the output of system link for stator current, if power system is broken down or disturbed again It is dynamic to cause the set end voltage of synchronous generator to decline, according to a state transfer criterion, judge whether current working meets the shape State transfer criterion；It is adjustment of field excitation by stator current limitation system link output switching when current working meets the state transfer criterion Device main ring exports, to be encouraged regulation action by force again by field regulator.
- 2. the condition control method of field regulator stator current limitation according to claim 1, it is characterised in that described When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, encouraged by force by field regulator Regulation acts so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by field regulator main ring Output switching is that stator current limits the output of system link, including：When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, carried out by field regulator It is strong to encourage regulation action so that the stator current increase of synchronous generator；Monitor synchronous generator stator current, and synchronous generator stator current reach pre-set stator current limit During 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 Calculate；Stator current limitation system carry out heat accumulation heat accumulation value reach pre-set stator current limitation system most It is that stator current limits the output of system link by field regulator main ring output switching, to cause synchronous generator during big permissible value The stator current of machine is reduced to a return value, starts in the return value less than the stator current limitation system pre-set During value, system is limited by stator current and carries out radiating calculating.
- 3. the condition control method of field regulator stator current limitation according to claim 2, it is characterised in that described When the state of field regulator limits the output of system link for stator current, led if power system is broken down or disturbed again Cause the set end voltage of synchronous generator to decline, according to a state transfer criterion, judge whether current working meets that the state is cut Criterion is changed, including：In the completion it is determined that the heat of stator current limitation system progress heat accumulation does not radiate, power 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. the condition control method of field regulator stator current limitation according to claim 3, it is characterised in that described According to a state transfer criterion, judge whether current working meets the state transfer criterion, including：The set end voltage of synchronous generator is obtained in real time；And according to the time step pre-set, it is determined that with the presence or absence of under the set end voltage of synchronous generator in a time step Drop numerical value is more than the threshold value pre-set；When the set end voltage that synchronous generator in a time step be present declines numerical value more than the threshold value pre-set, it is determined that Current working meets the state transfer criterion.
- A kind of 5. behavior control device of field regulator stator current limitation, it is characterised in that including：Malfunction monitoring unit, in field regulator normal operation, whether monitoring power system, which is broken down or disturbed, is led The set end voltage of synchronous generator is caused to decline；Regulation unit is encouraged by force, causes the set end voltage of synchronous generator to decline for breaking down or disturbing in power system When, carry out encouraging regulation action by force by field regulator so that the stator current increase of synchronous generator, meet that stator current limits It is that stator current limits the output of system link by field regulator main ring output switching after criterion processed；Judging unit, for when the state of field regulator limits the output of system link for stator current, and power 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 into system link Output switching exports for field regulator main ring, to be encouraged regulation action by force again by field regulator.
- 6. the behavior control device of field regulator stator current limitation according to claim 5, it is characterised in that described Regulation unit is encouraged by force, including：Adjustment control module is encouraged by force, causes the set end voltage of synchronous generator to decline for breaking down or disturbing in power system When, carry out encouraging regulation action by force by field regulator so that the stator current increase of synchronous generator；Heat accumulation computing module, reached for monitoring the stator current of synchronous generator, and in the stator current of synchronous generator When limiting system start up value to the stator current pre-set, 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 determining of pre-setting It is that stator current limitation system link is defeated by field regulator main ring output switching when electron current limits system maximum permissible value Go out, to cause the stator current of synchronous generator to be reduced to a return value, determine what the return value was pre-set less than described in When electron current limits system start up value, system is limited by stator current and carries out radiating calculating.
- 7. the behavior control device of field regulator stator current limitation according to claim 6, it is characterised in that described Judging unit, it is specifically used for：In the completion it is determined that the heat of stator current limitation system progress heat accumulation does not radiate, power 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.
- 8. the behavior control device of field regulator stator current limitation according to claim 7, it is characterised in that described Judging unit, it is specifically used for：The set end voltage of synchronous generator is obtained in real time；And according to the time step pre-set, it is determined that with the presence or absence of under the set end voltage of synchronous generator in a time step Drop numerical value is more than the threshold value pre-set；When the set end voltage that synchronous generator in a time step be present declines numerical value more than the threshold value pre-set, it is determined that Current working meets the state transfer criterion.
- 9. a kind of computer-readable recording medium, is stored thereon with computer program, it is characterised in that the program is held by processor Following steps are realized during row：In field regulator normal operation, the generator terminal for causing synchronous generator is broken down or disturbed to monitoring power system whether Voltage declines；When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, carried out by field regulator It is strong to encourage regulation action so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by field regulator Main ring output switching is that stator current limits the output of system link；When the state of field regulator limits the output of system link for stator current, if power system is broken down or disturbed again It is dynamic to cause the set end voltage of synchronous generator to decline, according to a state transfer criterion, judge whether current working meets the shape State transfer criterion；It is adjustment of field excitation by stator current limitation system link output switching when current working meets the state transfer criterion Device main ring exports, to be encouraged regulation action by force again by field regulator.
- 10. a kind of computer equipment, including memory, processor and the calculating that is stored in storage above and can run on a processor Machine program, it is characterised in that realize following steps during the computing device described program：In field regulator normal operation, the generator terminal for causing synchronous generator is broken down or disturbed to monitoring power system whether Voltage declines；When the set end voltage decline for causing synchronous generator is broken down or disturbed in power system, carried out by field regulator It is strong to encourage regulation action so that the stator current increase of synchronous generator, after meeting stator current limitation criterion, by field regulator Main ring output switching is that stator current limits the output of system link；When the state of field regulator limits the output of system link for stator current, if power system is broken down or disturbed again It is dynamic to cause the set end voltage of synchronous generator to decline, according to a state transfer criterion, judge whether current working meets the shape State transfer criterion；It is adjustment of field excitation by stator current limitation system link output switching when current working meets the state transfer criterion Device main ring exports, to be encouraged regulation action by force again by field regulator.
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| CN108681817A (en) * | 2018-05-17 | 2018-10-19 | 中电普瑞电力工程有限公司 | A kind of excitation system performance estimating method, device and storage medium |
| CN109088443A (en) * | 2018-08-13 | 2018-12-25 | 华北电力科学研究院有限责任公司 | The mistake of field regulator encourages limitation optimization method and system |
| 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 |
| 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 |
| 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 |
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| CN107834922B (en) | 2019-11-08 |
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