CN106532742A - Novel AVR excitation system transfer function model - Google Patents
Novel AVR excitation system transfer function model Download PDFInfo
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- CN106532742A CN106532742A CN201611047727.0A CN201611047727A CN106532742A CN 106532742 A CN106532742 A CN 106532742A CN 201611047727 A CN201611047727 A CN 201611047727A CN 106532742 A CN106532742 A CN 106532742A
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- output
- value
- uel
- unit
- pid control
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention relates to a novel AVR excitation system transfer function model comprising a PID control module, a comparator gate, a second inertia unit, an amplitude limiting unit and a third inertia unit, wherein the PID control module is used to receive a stator voltage reference value Ugref and a PSS regulation output value Upss. A voltage value Us is output through the regulation of the PID control module. A higher value between the voltage value Us and a feedback value UEL' is output through the high gate output. The value output by the comparator gate is output after the time delay of the second inertia unit and the amplitude limiting of the amplitude limiting unit. Finally a voltage value G(S) is output, thereby maintaining the level of the voltage. The novel AVR excitation system transfer function model is provided with the comparator gate, only selects the higher value between the Us and a UEL' as an output value, avoids conflict due to simultaneous functioning of the Upss and UEL, avoids frequent switching between the Us and the UEL, and sets a buffer for the value Ue range.
Description
Technical field
The present invention relates to technical field of electric power system control, more particularly to a kind of new A VR excitation system transmission function mould
Type.
Background technology
AVR exciter control systems are the important component parts of synchronous generator, it is possible to increase the static state of power system and dynamic
State stability, can speed up the recovery of line voltage in transient process.Transmission function is that the control answered is put inside automatization's principle
Simulation, is as a result the concrete control model to equipment, and different transmission functions has shown the different defeated result of equipment, and AVR is encouraged
Magnetic system transmission function has shown the pressure regulation effect of excitation system.
Existing AVR excitation systems transfer function model includes the coordination control of excitation system and each auxiliary link, such as Fig. 1
It is shown, UpssThe value of PSS controlling units output is represented, UEL represents low the encouraging of exciter control system and limits the value for exporting, PSS and excitation
Low encouraging limits coordination control, steady by the deviation of the proportional unit regulating system in pid control module, integral unit elimination system
The rate of change of state error, differentiation element regulating system deviation signal, then pid control module is exported by the 3rd inertance element
Value is postponed so that output result can not be mutated, then carries out amplitude limit output to output result by clipping unit, is finally exported
G (S), so as to play a part of maintenance voltage level.
But, as shown in Fig. 2 working as UpssWhen acting on UEL simultaneously, easily cause excitation PSS controlling unit and excitation is low encourages
Conflict between limiting element, causes the vibration of electrical network, and then affects the normal operation of safety of electrical network.
The content of the invention
To overcome problem present in correlation technique, the present invention to provide a kind of new A VR excitation system transfer function model.
The new A VR excitation system transfer function model that the present invention is provided includes that pid control module, competing wealthy family, second are used to
Property unit, clipping unit and the 3rd inertance element, wherein：
The pid control module is used to receive stator voltage reference value UgrefOutput valve U is adjusted with PSSpss；
The outfan of the pid control module electrically connects the input of the competing wealthy family, and the competing wealthy family is used to compare
The Us and value of feedback UEL' of the pid control module output；
The outfan of the competing wealthy family electrically connects the input of second inertance element；
The outfan of second inertance element electrically connects the input of the clipping unit；
The clipping unit is used for output voltage values G (S)；
The magnitude of voltage G (S) feeds back to the pid control module by the 3rd inertance element.
Preferably, in above-mentioned new A VR excitation system transfer function model, value of feedback UEL' is encouraged for excitation system is low
Limit the UEL and numerical value Ue sums of module output.
Preferably, in above-mentioned new A VR excitation system transfer function model, the pid control module include proportional unit,
Integral unit and differentiation element, the proportional unit, integral unit and differentiation element are connected in parallel.
Preferably, in above-mentioned new A VR excitation system transfer function model, the model also includes first differential unit,
The outfan of the integral unit electrically connects the input of the first differential unit.
Preferably, in above-mentioned new A VR excitation system transfer function model, the model also includes the first inertance element,
The outfan of the differentiation element electrically connects the input of first inertance element.
The technical scheme that the present invention is provided can include following beneficial effect：
The new A VR excitation system transfer function model that the present invention is provided includes that pid control module, competing wealthy family, second are used to
Property unit, clipping unit and the 3rd inertance element, wherein, pid control module be used for receive stator voltage reference value UgrefAnd PSS
Adjust output valve Upss, output voltage values Us is processed by the regulation of pid control module, by competing wealthy family select magnitude of voltage Us and
Excitation system is low to encourage higher numerical value in the UEL for limiting module output as output valve, while to avoid between Us and UEL frequently
Switching, sets the relief area of a numerical value Ue scope；The numerical value of competing wealthy family output through the second inertance element time delay and
The amplitude limit output of clipping unit, final output voltage value G (S), so as to play the purpose of maintenance voltage level.What the present invention was provided
New A VR excitation system transfer function model sets up competing wealthy family, only exports the magnitude of voltage of pid control module output by competing wealthy family
Higher numerical value in the Us and low UEL for encouraging restriction module feedback of excitation, it is to avoid UpssActed on UEL simultaneously and cause conflict, so as to keep away
Exempt to cause the vibration of electrical network, and then ensured the safe and stable operation of electrical network；Meanwhile, to avoid switching is changed frequently between Us and UEL,
The relief area of one numerical value Ue scope of setting.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
The present invention can be limited.
Description of the drawings
During accompanying drawing herein is merged in description and the part of this specification is constituted, show the enforcement for meeting the present invention
Example, and be used for explaining the principle of the present invention together with description.
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can be with according to these other accompanying drawings of accompanying drawings acquisition.
A kind of structural representation of AVR excitation systems transfer function model that Fig. 1 is provided for prior art；
A kind of waveform diagram of AVR excitation systems transfer function model that Fig. 2 is provided for prior art；
Fig. 3 is a kind of structural representation of new A VR excitation system transfer function model provided in an embodiment of the present invention；
The concrete symbols of Fig. 1-Fig. 3 are represented：
1-PID control modules, 11- proportional units, 12- integral units, 13- differentiation elements, 2- first differential units, 3-
One inertance element, the competing wealthy families of 4-, the second inertance elements of 5-, 6- clipping units, the 3rd inertance elements of 7-.
Specific embodiment
Here in detail exemplary embodiment will be illustrated, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.Conversely, they be only with as appended by
The example of consistent apparatus and method in terms of some described in detail in claims, the present invention.
The Main Function of excitation system is the electricity for maintaining electromotor or other control point (such as power plant high-voltage side bus)
It is pressed in given level.
Maintenance voltage level is the topmost task of exciter control system, has following 3 main causes:
First, it is ensured that the safety of Operation of Electric Systems equipment.Operation equipment in power system has its specified operation electricity
Pressure and highest operating voltage.Generator voltage is kept on permissible level, is to ensure electromotor and power system device safety
One of primary condition of operation, this requires that generator excited system is not only able in the quiescent state, and can be after large disturbances
Ensure generator voltage on given permissible level under stable state.Generator operation code specifies that large synchronous generator runs
Voltage must not be higher than the 110% of rated value.
Second, it is ensured that the economy of generator operation.It is most economical that electromotor is run near rated value.If generated electricity
Electromechanical drops, then export the stator current needed for identical power and will be increased to increase loss.Code specifies large-scale
Motor operation voltage must not be less than the 90% of rated value；When generator voltage is less than 95%, electromotor answers load limit operation.Its
He also has this problem by power equipment.
3rd, requirement and the requirement of raising power system stability of raising maintenance generator voltage ability are in many aspects
Consistent.Improvement of the exciter control system to steady stability, dynamic stability and transient stability, has obvious action, Er Qieshi
The simplest, economic and effective measures.
Referring to Fig. 3, the basic of new A VR excitation system transfer function model provided in an embodiment of the present invention is the figure shows
Structure.
New A VR excitation system transfer function model provided in an embodiment of the present invention includes PID control model 1, competing wealthy family
4th, the second inertance element 5, clipping unit 6 and the 3rd inertance element 7, wherein:
Pid control module 1 is used to receive stator voltage reference value UgrefOutput valve U is adjusted with PSSpss, stator voltage is joined
Examine value UgrefOutput valve U is adjusted with PSSpssIt is adjusted processing, wherein, PSS adjusts output valve UpssFor PSS (electric power system stabilities
Determine device) magnitude of voltage that exports, PSS is the additional link or attached of field regulator automatic channel (automatic voltage regulator AVR)
Feeder apparatus, is swung as input using the active power of low frequency 0.2-2.5Hz, is superimposed upon AVR defeated after amplification and adjustment phase place
On going out, the positive damping with the same effect of Generator Damping winding is produced, offset negative produced by the AVR that simple voltage deviation is adjusted
Damping, prevents power system from low-frequency oscillation occur, improves power system dynamic stability.
Further, stator voltage reference value U of inputgrefOutput valve U is adjusted with PSSpssBy pid control module 1
Adjustment effect, output voltage values Us.Pid control module 1 includes proportional unit 11, integral unit 12 and differentiation element 13, and compares
Example unit 11, integral unit 12 and differentiation element 13 are connected in parallel, wherein：
Proportional unit 11 is the deviation of response system in proportion, plays proportional control action.System once occurs in that deviation,
Proportion adjustment produces adjustment effect to reduce deviation immediately.Proportional action is big, can accelerate to adjust, reduce error, but excessive
Ratio, decline the stability of system, or even cause the unstable of system.
Integral unit 12 is to make system eliminate steady-state error, is improved without margin.Because there is error, integral adjustment is just carried out,
Until indifference, integral adjustment stopping, integral adjustment export a constant value.The power of integral action depends on and integration time constant Ti, Ti
Less, integral action is stronger.Otherwise TiIt is big then integral action is weak, add integral adjustment decline can system stability, dynamic
Response is slack-off.Integral action is often combined with other two Rule adjusting, constitutes pi regulator or PID regulator.
Differentiation element 13 reflects the rate of change of system deviation signal, with predictability, can predict the trend of change of error, because
This can produce advanced control action, before deviation is not also formed, be differentiated adjustment effect elimination.Therefore, it can change
The dynamic property of kind system.Select under suitable conditions in derivative time, it is possible to reduce overshoot, reduce regulating time.The differential action
There is amplification to noise jamming, therefore the too strong differential that adds is adjusted, it is unfavorable to system rejection to disturbance.Additionally, differential reaction is
Rate of change, and when input is not changed in, the differential action is output as zero.The differential action can not be used alone, and need and other two
Plant Rule adjusting to combine, constitute PD or PID controller.
Further, if the integral action of integral unit 12 is too strong, adjustment effect can be made too strong, causes controlled variable to surpass
Adjust, or even produce vibration, therefore to prevent 12 integral action of integral unit too strong, the outfan electrical connection single order of integral unit 12
Differentiation element 2, for predicting deviation.
Further, if the differential action of differentiation element 13 is too strong, adjustment effect can be made too strong, causes system overshoot and shake
Swing, thus differentiation element 13 outfan electrically connect the first inertance element 3, play time delay effect, prevent output result from
Mutation.
Further, the outfan of pid control module 1 electrically connects the input of competing wealthy family 4, and competing wealthy family 4 is used to compare
Pid control module 1 output Us and excitation system it is low encourage limit module output UEL, competing wealthy family 4 select Us and UEL wherein compared with
High value is exported, that is to say, that by the 4 only one of which numerical value output of competing wealthy family, so as to avoid UpssMake with UEL simultaneously
With and cause conflict, and then ensured the safe and stable operation of electrical network.
Further, the U of the output of pid control module 1 is selected by competing wealthy family 4sIt is low with excitation system encourage restriction module it is defeated
Higher in the UEL for going out numerical value output, but Us and UEL frequent switching between the two, are so unfavorable for the stable operation of electrical network, because
This one threshold value of setting, only reaching threshold value could be exported by competing wealthy family 4, specifically：One buffer value Ue of setting, when
UEL is limited when being converted to Us, needs its power to be UEL'(UEL'=UEL+Ue) competing wealthy family 4 could be passed through export；And Us conversions
For UEL when, it is only necessary to reach UEL, so equivalent to the relief area of one Ue scope of setting.
Further, the outfan of competing wealthy family 4 electrically connects the input of the second inertance element 5, the value of the output of Ji Jing wealthy families 4
By the delay action of the second inertance element 5 so that can not be mutated by the numerical value Us or UEL' of competing wealthy family 4.
Further, be limit output numerical value Us or UEL' amplitude, the second inertance element 5 outfan electrical connection limit
The input of width unit 6, works as UminThe amplitude ＜ U of the numerical value Us or UEL' of ＜ outputsmaxWhen, the width of output numerical value Us or UEL'
Value；As the amplitude >=U of the numerical value Us or UEL' of outputmaxWhen, the amplitude of output is Umax；When the width of the numerical value Us or UEL' of output
Value≤Umin, the amplitude of output is Umin。
Further, by the effect of clipping unit 6, final magnitude of voltage G (S) is exported, is further to reduce voltage
Deviation, the magnitude of voltage G (S) for exporting is fed back to by the 3rd inertance element 7 input of pid control module 1 using iterative algorithm
End, up in the range of the deviation of voltage is minimized, exports final magnitude of voltage G (S).
New A VR excitation system transfer function model provided in an embodiment of the present invention includes pid control module 1, competing wealthy family
4th, the second inertance element 5, clipping unit 6 and the 3rd inertance element 7, wherein, pid control module 1 is used to receive stator voltage ginseng
Examine value UgrefOutput valve U is adjusted with PSSpss, output voltage values Us is processed by the regulation of pid control module 1, by competing wealthy family 4
Select magnitude of voltage Us and excitation system is low encourage the UEL for limiting module output in higher numerical value as output valve, while to avoid
Frequent switching between Us and UEL, sets the relief area of a numerical value Ue scope；The numerical value of the output of competing wealthy family 4 is through the second inertia
The amplitude limit output of the time delay and clipping unit 6 of unit 5, final output voltage value G (S), so as to play maintenance voltage level
Purpose.New A VR excitation system transfer function model provided in an embodiment of the present invention sets up competing wealthy family 4, by competing wealthy family 4
Higher numerical value in the magnitude of voltage Us and the low UEL for encouraging restriction module feedback of excitation of the output output of pid control module 1, it is to avoid Upss
Acted on UEL simultaneously and cause conflict, so as to avoid causing the vibration of electrical network, and then ensured the safe and stable operation of electrical network；Together
When, to avoid switching is changed frequently between Us and UEL, set the relief area of a numerical value Ue scope.
Those skilled in the art will readily occur to its of the present invention after considering description and putting into practice disclosure of the invention here
Its embodiment.The application is intended to any modification of the present invention, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including the undocumented common knowledge in the art of the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the precision architecture for being described above and being shown in the drawings is the invention is not limited in, and
And various modifications and changes can be being carried out without departing from the scope.The scope of the present invention is limited only by appended claim.
Claims (5)
1. a kind of new A VR excitation system transfer function model, it is characterised in that including pid control module (1), competing wealthy family
(4), the second inertance element (5), clipping unit (6) and the 3rd inertance element (7), wherein：
The pid control module (1) is for receiving stator voltage reference value UgrefOutput valve U is adjusted with PSSpss；
The outfan of the pid control module (1) electrically connects the input of the competing wealthy family (4), and the competing wealthy family (4) is used for
Us and value of feedback UEL' that the comparison pid control module (1) exports；
The outfan of the competing wealthy family (4) electrically connects the input of second inertance element (5)；
The outfan of second inertance element (5) electrically connects the input of the clipping unit (6)；
The clipping unit (6) is for output voltage values G (S)；
The magnitude of voltage G (S) feeds back to the pid control module (1) by the 3rd inertance element (7).
2. new A VR excitation system transfer function model according to claim 1, it is characterised in that the value of feedback
UEL' is that excitation system is low encourages the UEL and numerical value Ue sums for limiting module output.
3. new A VR excitation system transfer function model according to claim 1, it is characterised in that the PID control mould
Block (1) includes proportional unit (11), integral unit (12) and differentiation element (13), the proportional unit (11), integral unit
(12) it is connected in parallel with differentiation element (13).
4. new A VR excitation system transfer function model according to claim 3, it is characterised in that the model is also wrapped
First differential unit (2) is included, the outfan of the integral unit (12) electrically connects the input of the first differential unit (2).
5. new A VR excitation system transfer function model according to claim 3, it is characterised in that the model is also wrapped
The first inertance element (3) is included, the outfan of the differentiation element (13) electrically connects the input of first inertance element (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611047727.0A CN106532742B (en) | 2016-11-23 | 2016-11-23 | A kind of AVR excitation system transfer function model |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611047727.0A CN106532742B (en) | 2016-11-23 | 2016-11-23 | A kind of AVR excitation system transfer function model |
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| CN106532742A true CN106532742A (en) | 2017-03-22 |
| CN106532742B CN106532742B (en) | 2019-07-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107359833A (en) * | 2017-07-26 | 2017-11-17 | 云南电力试验研究院(集团)有限公司 | A kind of synchronous generator static excitation control method and system |
| CN108023518A (en) * | 2017-11-16 | 2018-05-11 | 云南电网有限责任公司电力科学研究院 | A kind of field regulator transfer function model |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103516274A (en) * | 2013-09-26 | 2014-01-15 | 国家电网公司 | Generator excitation system comprising multi-type limiting units |
| CN103516278A (en) * | 2013-09-26 | 2014-01-15 | 国家电网公司 | Excitation system full-function-performance simulation system based on MATLAB |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103516274A (en) * | 2013-09-26 | 2014-01-15 | 国家电网公司 | Generator excitation system comprising multi-type limiting units |
| CN103516278A (en) * | 2013-09-26 | 2014-01-15 | 国家电网公司 | Excitation system full-function-performance simulation system based on MATLAB |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107359833A (en) * | 2017-07-26 | 2017-11-17 | 云南电力试验研究院(集团)有限公司 | A kind of synchronous generator static excitation control method and system |
| CN107359833B (en) * | 2017-07-26 | 2019-09-24 | 云南电力试验研究院(集团)有限公司 | A kind of synchronous generator static excitation control method and system |
| CN108023518A (en) * | 2017-11-16 | 2018-05-11 | 云南电网有限责任公司电力科学研究院 | A kind of field regulator transfer function model |
| CN108023518B (en) * | 2017-11-16 | 2020-05-29 | 云南电网有限责任公司电力科学研究院 | Excitation regulator |
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| Publication number | Publication date |
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| CN106532742B (en) | 2019-07-30 |
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