CN108736444A - A kind of phase modifier field loss protection method and system - Google Patents
A kind of phase modifier field loss protection method and system Download PDFInfo
- Publication number
- CN108736444A CN108736444A CN201810338072.5A CN201810338072A CN108736444A CN 108736444 A CN108736444 A CN 108736444A CN 201810338072 A CN201810338072 A CN 201810338072A CN 108736444 A CN108736444 A CN 108736444A
- Authority
- CN
- China
- Prior art keywords
- criterion
- interval
- protection
- voltage
- parameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
- H02H7/065—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors against excitation faults
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of phase modifier field loss protection method and system, the method includes：Acquisition phase modifier parameter is simultaneously handled, and obtains phase modifier field loss protection parameter；Judge to confirm UstWhether in the first pre-set interval of system voltage；If the UstIn the first pre-set interval of system voltage, it is respectively compared E and UrWith preset threshold coefficient K, if E and UrRespectively less than corresponding preset threshold COEFFICIENT K, then protection act；If the E and UrAny one be not less than corresponding preset threshold COEFFICIENT K, then protect return；Judge the UstWhether in the second pre-set interval of system voltage；If the UstIn the second pre-set interval of system voltage；Judge E and UrWhether reverse criterion or high pressure criterion are met, if meeting any criterion in the reverse criterion or high pressure criterion, protection act；If E and UrThe reverse criterion and the high pressure criterion are not met, then protects return.
Description
Technical field
The present invention relates to technical field of electricity, more particularly, to a kind of phase modifier field loss protection method and system.
Background technology
In recent years, the development with technologies such as direct current transportation, new energy, bulk power grid, extra-high voltages and power electronic equipment
It widely applies, operation of power networks characteristic variations are very big, idle increased needed for system, and the idle and voltage that need to solve power grid is asked
Topic reinforces reactive power compensation and regulating power.Synchronous capacitor is special reactive power source, being capable of General Promotion system dynamic
Reactive reserve can solve various types of electricity such as receiving end power grid dynamic reactive deficiency, weak sending end grid short circuit capacity underbraced
Press stable problem, the voltage support and operational flexibility of strengthening system.Synchronous capacitor and SVC, STATCOM etc. are based on electric power electricity
The dynamic reactive compensation device of sub- technology is compared, and not only provides capacity of short circuit for system, but also has better idle power producing characteristics,
Direct current sending end transient overvoltage is reduced, inhibits direct current receiving end commutation failure, have using strong raising system stability etc. of encouraging
Unique advantage.
When loss of excitation failure occurs for synchronous capacitor, phase modifier does not send idle, the idle work(in absorption system instead not only
Rate has aggravated the voltage fluctuation of electric system.If without detection investigation in time, in direct current commutation failure occurs for loss of excitation failure,
When receiving end power grid needs reactive power support, synchronous capacitor still has due to absorption system reactive power because of loss of excitation failure, further
Accelerate the collapse of receiving end network voltage, generates serious harm.
Synchronous capacitor field loss protection at present configures two-part protection, and I sections of protection is into phase reactive power electricity low with system
Pressure constitutes and logic, is less than I sections of definite values into phase reactive power and system voltage is less than voltage definite value, then protection exit acts, every
From synchronous capacitor；II sections of protection is into phase reactive power and excitation low-voltage constitutes and logic, is less than II into phase reactive power
Section definite value and excitation voltage be less than definite value, then protection exit act, be isolated synchronous capacitor.But when system high voltage situation issues
When raw loss of excitation failure, there are the dead zones of certain area for two-part protection.In order to reliably detect isolation phase modifier loss of excitation failure,
Phase modifier absorbing reactive power due to there are loss of excitation failure when system being avoided to need reactive power support, it is necessary to configure highly sensitive tune
Camera field loss protection.
Invention content
In order to solve the existing protected mode of phase modifier existing for background technology, there are the dead-time problem of certain area, this hairs
Bright to provide a kind of phase modifier field loss protection method and system, the method and system pass through to stator built-in potential and rotor-exciting
The adjusting of voltage, set criterion and according to preset rules judge phase modifier whether loss of excitation；A kind of phase modifier field loss protection side
Method includes：
Acquisition phase modifier parameter is simultaneously handled, and obtains phase modifier field loss protection parameter；The field loss protection parameter includes generator terminal
Parameter, excitation parameter and systematic parameter；The generator terminal parameter includes the perunit value E of the virtual value of phase modulation machine stator built-in potential；
The excitation parameter includes the perunit value U of excitation voltager；The systematic parameter includes the perunit value of the virtual value of system voltage
Ust；
Judge to confirm UstWhether in the first pre-set interval of system voltage；
If the UstIn the first pre-set interval of system voltage, it is respectively compared E and UrWith preset threshold coefficient K, if E and
UrRespectively less than corresponding preset threshold COEFFICIENT K, then protection act；
If the E and UrAny one be not less than corresponding preset threshold COEFFICIENT K, then protect return.
Further, confirm U in the judgementstWhether after in the first pre-set interval of system voltage, the method is also
Including：
Judge the UstWhether in the second pre-set interval of system voltage；
If the UstIn the second pre-set interval of system voltage；Judge E and UrWhether reverse criterion or high pressure criterion are met,
If meeting any criterion in the reverse criterion or high pressure criterion, protection act；
If E and UrThe reverse criterion and the high pressure criterion are not met, then protects return；
Further, the protection act includes through the t protection acts that are delayed；
Further, the first pre-set interval of the system voltage is 0~λ1；The second pre-set interval of the system voltage is λ1
~λ2；The λ1For break over voltage, λ2For maximum voltage, wherein 0<λ1<1、1<λ2<1.5；The preset threshold coefficient K's takes
Value ranging from 0<K<1.2, the threshold coefficient K is preset according to phase modifier operating condition before loss of excitation；
Further, the reverse criterion includes:Wherein, C is inverse ratio system
Number, 0≤C≤1；B1For inverse offset coefficient, B1> 0；The high pressure criterion includes：
Wherein, B2For high pressure excursion coefficient, B2> 0；
Further, the high pressure criterion further includes rate start-up criterion, and the rate start-up criterion includes：
Wherein, Δ t is certain time interval,For the generator terminal electric current before Δ t time intervals, IeFor the specified electricity of generator terminal
Stream；n1For current start coefficient, 0<n1<1；Ur-ΔtFor the excitation voltage before Δ t time intervals；n2Start for excitation voltage and is
Number, 0<n2<1；
A kind of phase modifier field loss protection system includes：
Data capture unit, the data capture unit obtain phase modifier loss of excitation for acquiring phase modifier parameter and handling
Protection parameters；The field loss protection parameter includes generator terminal parameter, excitation parameter and systematic parameter；The generator terminal parameter includes adjusting
The perunit value E of the virtual value of phase machine stator built-in potential；The excitation parameter includes the perunit value U of excitation voltager；The system ginseng
Number includes the perunit value U of the virtual value of system voltagest；
Interval judgement unit, the interval judgement unit confirm U for judgingstWhether in the first pre-set interval of system voltage
It is interior；
First interval criterion unit, the first interval criterion unit is for being respectively compared E and UrWith preset threshold system
The size of number K, and field loss protection instruction is exported according to criterion result；If E and UrRespectively less than corresponding preset threshold COEFFICIENT K, then
The field loss protection instruction of output is protection act；If the E and UrAny one be not less than corresponding preset threshold COEFFICIENT K, then
The field loss protection instruction of output returns for protection；
Further, the system comprises second interval criterion units；
The interval judgement unit is for judging the UstWhether in the second pre-set interval of system voltage；If described in judging
UstIn the second pre-set interval of system voltage, then start second interval criterion unit；
The second interval criterion unit is for judging E and UrWhether reverse criterion or high pressure criterion are met, according to criterion
As a result output field loss protection instruction；And if judging result meets any criterion in the reverse criterion or high pressure criterion, it is defeated
The field loss protection instruction gone out is protection act；If E and Ur do not meet the reverse criterion and the high pressure criterion, the mistake exported
Magnetic protection instruction returns for protection；
Further, the field loss protection instruction protection act of the first interval criterion unit output includes being protected through the t that is delayed
Shield acts；The field loss protection instruction protection act of the second interval criterion unit output includes through the t protection acts that are delayed；
Further, as the system voltage UstIn 0~λ of section1When, system described in the interval judgement unit judges
Unit UstIn the first pre-set interval；As the system voltage UstIn section λ1~λ2When, the interval judgement unit judges
The system unit UstIn the second pre-set interval；Wherein 0<λ1<1、1<λ2<1.5；
Further, the reverse criterion includes:Wherein, C is inverse ratio coefficient,
0≤C≤1；B1For inverse offset coefficient, B1> 0；The high pressure criterion includes：Its
In, B2For high pressure excursion coefficient, B2> 0；
Further, the high pressure criterion further includes rate start-up criterion, and the rate start-up criterion includes：
Wherein, Δ t is certain time interval,For the generator terminal electric current before Δ t time intervals, Ie is that generator terminal is specified
Electric current；n1For current start coefficient, 0<n1<1；Ur-ΔtFor the excitation voltage before Δ t time intervals；n2Start for excitation voltage
Coefficient, 0<n2<1。
Beneficial effects of the present invention are：Technical scheme of the present invention gives a kind of phase modifier field loss protection method and is
System, the method and system set criterion and according to preset rules by the adjusting to stator built-in potential and rotor excited voltage
Judge phase modifier whether loss of excitation；The method and system can reliably detect isolation phase modifier loss of excitation failure, there is no dead zone and
High sensitivity solves the problems, such as that there are certain area dead zones in system high voltage for existing phase modifier protection.
Description of the drawings
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by：
Fig. 1 is a kind of flow chart of phase modifier field loss protection method of the specific embodiment of the invention；
Fig. 2 is the phase modifier field loss protection method that a variety of criterions are realized according to system voltage of the specific embodiment of the invention
Flow chart；
Fig. 3 is a kind of structure chart of phase modifier field loss protection system of the specific embodiment of the invention.
Specific implementation mode
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be to disclose at large and fully
The present invention, and fully convey the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related field has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is a kind of flow chart of phase modifier field loss protection method of the specific embodiment of the invention, and the method passes through
Adjusting to stator built-in potential and rotor excited voltage, set criterion and according to preset rules judge phase modifier whether loss of excitation；Institute
Stating a kind of phase modifier field loss protection method includes：
Step 110, it acquires phase modifier parameter and handles, obtain phase modifier field loss protection parameter；
The acquisition parameter mentioned in the step 110 and processing can be real-time so that systems stay obtains and the time
Corresponding one group of phase modifier field loss protection parameter；
Further, the field loss protection parameter includes generator terminal parameter, excitation parameter and systematic parameter；The generator terminal ginseng
Number includes the perunit value E of the virtual value of phase modulation machine stator built-in potential；The excitation parameter includes the perunit value U of excitation voltager；Institute
State the perunit value U for the virtual value that systematic parameter includes system voltagest；
The generator terminal parameter further includes generator terminal electric current；
Step 120, judge to confirm UstWhether in the first pre-set interval of system voltage；
Further, the first pre-set interval of the system voltage is 0~λ1；The λ1For break over voltage, wherein 0<λ1<1；
The perunit value E of the virtual value of the phase modulation machine stator built-in potential and perunit value U of the excitation voltagerWith
The variation of system voltage and change, and work as system voltage UstUnder break over voltage, i.e., in first pre-set interval when, this
When phase modulation machine stator built-in potential virtual value perunit value E and the excitation voltage perunit value UrIt is preset with one
The size that threshold coefficient K carries out, which compares, can confirm whether the phase modifier is in loss of excitation state；
Further, the value range of the preset threshold coefficient K is 0<K<1.2, the threshold coefficient K is according to loss of excitation
Preceding phase modifier operating condition and preset；
Step 130, if the UstIn the first pre-set interval of system voltage, it is respectively compared E and UrWith preset threshold system
Number K, if E and UrRespectively less than corresponding preset threshold COEFFICIENT K, then protection act；
Step 140, if the E and UrAny one be not less than corresponding preset threshold COEFFICIENT K, then protect return；
Further, the protection act includes through the t protection acts that are delayed.
Further, as shown in Fig. 2, Fig. 2 realizes a variety of criterions for the specific embodiment of the invention according to system voltage
Phase modifier field loss protection method flow chart；Confirm U in the judgementstWhether in the first pre-set interval of system voltage it
Afterwards, the method further includes：
Step 121, judge the UstWhether in the second pre-set interval of system voltage；
By adjusting the break over voltage λ1Amplitude, by the system voltage UstValue range be divided into the first preset areas
Between and the second pre-set interval, the first pre-set interval is as described above 0 between break over voltage；And second pre-set interval is turning
It rolls between voltage and maximum voltage；I.e. described the second pre-set interval of system voltage is λ1~λ2；λ2For maximum voltage, wherein 0<λ1<
1、1<λ2<1.5；
Step 122, if the UstIn the second pre-set interval of system voltage；Judge E and UrWhether meet reverse criterion or
High pressure criterion, if meeting any criterion in the reverse criterion or high pressure criterion, protection act；
Step 123, if E and UrThe reverse criterion and the high pressure criterion are not met, then protects return；
Further, the reverse criterion includes:Wherein, C is inverse ratio system
Number, 0≤C≤1；B1For inverse offset coefficient, B1> 0；
Criterion is adjusted for stator reversing；For
Rotor inversely adjusts criterion；
Further, the high pressure criterion includes：Wherein, B2For high pressure excursion
Coefficient, B2> 0；For stator high voltage adjusting criterion；
For rotor high voltage adjusting criterion；
Further, the high pressure criterion further includes rate start-up criterion, and the rate start-up criterion is as follows：
Wherein, Δ t is certain time interval,For the generator terminal electric current before Δ t time intervals, Ie is that generator terminal is specified
Electric current；n1For current start coefficient, 0<n1<1；Ur-ΔtFor the excitation voltage before Δ t time intervals；n2Start for excitation voltage
Coefficient, 0<n2<1；
During system voltage normal regulating, rotor inversely adjusts criterion, stator reversing adjusts criterion and rate starts
Criterion is reliably failure to actuate, field loss protection reliably not malfunction.
In the case of system high voltage phase modifier occur loss of excitation failure when, stator high voltage criterion, rotor high voltage criterion with
And the action of rate start-up criterion, field loss protection action message.
When loss of excitation failure occurs for phase modifier in the case of system low-voltage, stator reversing, which adjusts criterion, rotor and inversely adjusts, to be sentenced
According to action, field loss protection action message.
To sum up, during system voltage normal regulating, field loss protection reliably not malfunction, in system high voltage or low-voltage
In the case of phase modifier occur loss of excitation failure when, field loss protection action message, be not present dead zone, high sensitivity.
Fig. 3 is a kind of structure chart of phase modifier field loss protection system of the specific embodiment of the invention, as shown, described
System includes：
Data capture unit 301, the data capture unit 301 obtain phase modulation for acquiring phase modifier parameter and handling
Machine field loss protection parameter；The field loss protection parameter includes generator terminal parameter, excitation parameter and systematic parameter；The generator terminal parameter
The perunit value E of virtual value including phase modulation machine stator built-in potential；The excitation parameter includes the perunit value U of excitation voltager；It is described
Systematic parameter includes the perunit value U of the virtual value of system voltagest；
Interval judgement unit 302, the interval judgement unit 302 confirm U for judgingstIt is whether pre- in system voltage first
If in section；
First interval criterion unit 303, the first interval criterion unit 303 is for being respectively compared E and UrWith it is preset
The size of threshold coefficient K, and field loss protection instruction is exported according to criterion result；If E and UrRespectively less than corresponding preset threshold system
Number K, then the field loss protection instruction exported is protection act；If the E and UrAny one be not less than corresponding preset threshold system
Number K, then the field loss protection instruction exported return for protection；
Further, the system comprises second interval criterion units 304；
The interval judgement unit 302 is for judging the UstWhether in the second pre-set interval of system voltage；If judging
The UstIn the second pre-set interval of system voltage, then start second interval criterion unit 304；
The second interval criterion unit 304 is for judging E and UrWhether reverse criterion or high pressure criterion are met, according to sentencing
According to result output field loss protection instruction；And if judging result meets any criterion in the reverse criterion or high pressure criterion,
The field loss protection instruction of output is protection act；If E and UrThe reverse criterion and the high pressure criterion are not met, then is exported
Field loss protection instruction returns for protection；
Further, the field loss protection instruction protection act that the first interval criterion unit 303 exports includes through the t that is delayed
Protection act；The field loss protection instruction protection act that the second interval criterion unit 304 exports includes dynamic through the t protections that are delayed
Make；
Further, as the system voltage UstIn 0~λ of section1When, the interval judgement unit 302 judges described
System unit UstIn the first pre-set interval；As the system voltage UstIn section λ1~λ2When, the interval judgement unit
302 judge the system unit UstIn the second pre-set interval；Wherein 0<λ1<1、1<λ2<1.5；
Further, the reverse criterion includes:Wherein, C be inverse ratio coefficient, 0
≤C≤1；B1For inverse offset coefficient, B1> 0；The high pressure criterion includes：Its
In, B2For high pressure excursion coefficient, B2> 0；
Further, the high pressure criterion further includes rate start-up criterion, and the rate start-up criterion includes：
Wherein, Δ t is certain time interval,For the generator terminal electric current before Δ t time intervals, IeFor the specified electricity of generator terminal
Stream；n1For current start coefficient, 0<n1<1；Ur-ΔtFor the excitation voltage before Δ t time intervals；n2Start for excitation voltage and is
Number, 0<n2<1。
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the disclosure
Example can be put into practice without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Those skilled in the art, which are appreciated that, to carry out adaptively the module in the equipment in embodiment
Change and they are arranged in the one or more equipment different from the embodiment.It can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it may be used any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit requires, abstract and attached drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation
It replaces.Involved in this specification to the step of number be only used for distinguishing each step, and time being not limited between each step
Or the relationship of logic, restriction unless the context clearly, otherwise the relationship between each step includes various possible situations.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments means to be in the disclosure
Within the scope of and form different embodiments.For example, embodiment claimed in detail in the claims is one of arbitrary
It mode can use in any combination.
The all parts embodiment of the disclosure can be with hardware realization, or to run on one or more processors
Software module realize, or realized with combination thereof.The disclosure is also implemented as executing side as described herein
Some or all equipment or system program (for example, computer program and computer program product) of method.It is such
Realize that the program of the disclosure can may be stored on the computer-readable medium, or can be with the shape of one or more signal
Formula.Such signal can be downloaded from internet website and be obtained, and either be provided on carrier signal or with any other shape
Formula provides.
The disclosure is limited it should be noted that above-described embodiment illustrates rather than the disclosure, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.Word "comprising" is not arranged
Except there are element or steps not listed in the claims.Word "a" or "an" before element does not exclude the presence of more
A such element.The disclosure can be by means of including the hardware of several different elements and by means of properly programmed calculating
Machine is realized.If in the unit claim for listing dry systems, several in these systems can be by same
Hardware branch embodies.
The above is only the specific implementation mode of the disclosure, it is noted that for the ordinary skill people of this field
Member for, under the premise of not departing from disclosure spirit, can make several improvements, change and deform, these improve, modification,
It is regarded as falling within the scope of protection of this application with deformation.
Claims (12)
1. a kind of phase modifier field loss protection method, the method includes：
Acquisition phase modifier parameter is simultaneously handled, and obtains phase modifier field loss protection parameter；The field loss protection parameter include generator terminal parameter,
Excitation parameter and systematic parameter；The generator terminal parameter includes the perunit value E of the virtual value of phase modulation machine stator built-in potential；It is described to encourage
Magnetic parameter includes the perunit value U of excitation voltager；The systematic parameter includes the perunit value U of the virtual value of system voltagest；
Judge to confirm UstWhether in the first pre-set interval of system voltage；
If the UstIn the first pre-set interval of system voltage, it is respectively compared E and UrWith preset threshold coefficient K, if E and Ur?
Less than corresponding preset threshold COEFFICIENT K, then protection act；
If the E and UrAny one be not less than corresponding preset threshold COEFFICIENT K, then protect return.
2. according to the method described in claim 1, it is characterized in that, confirming U in the judgementstIt is whether pre- in system voltage first
If after in section, the method further includes：
Judge the UstWhether in the second pre-set interval of system voltage；
If the UstIn the second pre-set interval of system voltage；Judge E and UrWhether reverse criterion or high pressure criterion are met, if symbol
Any criterion in the reverse criterion or high pressure criterion is closed, then protection act；
If E and UrThe reverse criterion and the high pressure criterion are not met, then protects return.
3. method according to claim 1 or 2, it is characterised in that：The protection act includes through the t protection acts that are delayed.
4. according to the method described in claim 2, it is characterized in that：The first pre-set interval of the system voltage is 0~λ1；It is described
The second pre-set interval of system voltage is λ1~λ2；The λ1For break over voltage, λ2For maximum voltage, wherein 0<λ1<1、1<λ2<1.5；
The value range of the preset threshold coefficient K is 0<K<1.2, the threshold coefficient K is according to phase modifier operating condition before loss of excitation
And it presets.
5. according to the method described in claim 4, it is characterized in that：The reverse criterion includes:
Wherein, C is inverse ratio coefficient, 0≤C≤1；B1For inverse offset coefficient, B1> 0；The high pressure criterion includes：Wherein, B2For high pressure excursion coefficient, B2> 0.
6. described according to the method described in claim 5, it is characterized in that, the high pressure criterion further includes rate start-up criterion
Rate start-up criterion includes：
Wherein, Δ t is certain time interval,For the generator terminal electric current before Δ t time intervals, IeFor generator terminal rated current；
n1For current start coefficient, 0<n1<1；Ur-ΔtFor the excitation voltage before Δ t time intervals；n2For excitation voltage startup coefficient, 0
<n2<1。
7. a kind of phase modifier field loss protection system, the system comprises：
Data capture unit, the data capture unit obtain phase modifier field loss protection for acquiring phase modifier parameter and handling
Parameter；The field loss protection parameter includes generator terminal parameter, excitation parameter and systematic parameter；The generator terminal parameter includes phase modifier
The perunit value E of the virtual value of stator built-in potential；The excitation parameter includes the perunit value U of excitation voltager；The systematic parameter packet
Include the perunit value U of the virtual value of system voltagest；
Interval judgement unit, the interval judgement unit confirm U for judgingstWhether in the first pre-set interval of system voltage；
First interval criterion unit, the first interval criterion unit is for being respectively compared E and UrWith preset threshold coefficient K's
Size, and field loss protection instruction is exported according to criterion result；If E and UrRespectively less than corresponding preset threshold COEFFICIENT K, then export
Field loss protection instruction is protection act；If the E and UrAny one be not less than corresponding preset threshold COEFFICIENT K, then export
Field loss protection instruction returns for protection.
8. system according to claim 7, it is characterised in that：The system comprises second interval criterion units；
The interval judgement unit is for judging the UstWhether in the second pre-set interval of system voltage；If judging the Ust?
In the second pre-set interval of system voltage, then start second interval criterion unit；
The second interval criterion unit is for judging E and UrWhether reverse criterion or high pressure criterion are met, it is defeated according to criterion result
Go out field loss protection instruction；And if judging result meets any criterion in the reverse criterion or high pressure criterion, the mistake exported
Magnetic protection instruction is protection act；If E and UrThe reverse criterion and the high pressure criterion, the then field loss protection exported are not met
Instruction returns for protection.
9. system according to claim 7 or 8, it is characterised in that：The loss of excitation of the first interval criterion unit output is protected
It includes through the t protection acts that are delayed that finger shield, which enables protection act,；The field loss protection instruction protection of the second interval criterion unit output
Action includes through the t protection acts that are delayed.
10. system according to claim 8, it is characterised in that：As the system voltage UstIn 0~λ of section1When, institute
State system unit U described in interval judgement unit judgesstIn the first pre-set interval；As the system voltage UstIn section λ1~
λ2When, system unit U described in the interval judgement unit judgesstIn the second pre-set interval；Wherein 0<λ1<1、1<λ2<1.5。
11. system according to claim 10, it is characterised in that：The reverse criterion includes:
Wherein, C is inverse ratio coefficient, 0≤C≤1；B1For inverse offset coefficient, B1> 0；The high pressure criterion includes：Wherein, B2For high pressure excursion coefficient, B2> 0.
12. system according to claim 11, which is characterized in that the high pressure criterion further includes rate start-up criterion, institute
Stating rate start-up criterion includes：
Wherein, Δ t is certain time interval,For the generator terminal electric current before Δ t time intervals, IeFor generator terminal rated current；
n1For current start coefficient, 0<n1<1；Ur-ΔtFor the excitation voltage before Δ t time intervals；n2For excitation voltage startup coefficient, 0
<n2<1。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810338072.5A CN108736444B (en) | 2018-04-16 | 2018-04-16 | Phase modulator field loss protection method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810338072.5A CN108736444B (en) | 2018-04-16 | 2018-04-16 | Phase modulator field loss protection method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108736444A true CN108736444A (en) | 2018-11-02 |
| CN108736444B CN108736444B (en) | 2021-08-24 |
Family
ID=63938934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810338072.5A Active CN108736444B (en) | 2018-04-16 | 2018-04-16 | Phase modulator field loss protection method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108736444B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038494A (en) * | 2018-08-16 | 2018-12-18 | 国电南瑞科技股份有限公司 | Phase modifier field loss protection excitation low-voltage judgment method |
| CN110061475A (en) * | 2019-03-22 | 2019-07-26 | 中国电力科学研究院有限公司 | A kind of phase modifier field loss protection method and system based on to systematic influence degree |
| CN110994535A (en) * | 2019-11-08 | 2020-04-10 | 国电南瑞科技股份有限公司 | Method and system for judging disconnection of excitation voltage measurement circuit |
| CN111509668A (en) * | 2020-04-23 | 2020-08-07 | 南京南瑞继保电气有限公司 | Phase modulator field loss protection method and device and electronic equipment |
| CN112290509A (en) * | 2020-09-16 | 2021-01-29 | 中国电力科学研究院有限公司 | Phase modulation magnetic loss protection method and system for preventing voltage fluctuation from causing malfunction |
| CN112444745A (en) * | 2019-09-03 | 2021-03-05 | 南京南瑞继保工程技术有限公司 | Method and device for judging phase modulator field loss fault caused by pulse loss |
| CN112952756A (en) * | 2021-03-04 | 2021-06-11 | 中国电力科学研究院有限公司 | Phase modulator loss-of-field protection method with self-adaptive fixed value adjustment |
| CN116780471A (en) * | 2023-08-24 | 2023-09-19 | 南方电网调峰调频发电有限公司 | Direct-current voltage-based symmetric loss-of-excitation protection method for variable-speed pumping and storage unit network side |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001037074A (en) * | 1999-07-16 | 2001-02-09 | Toshiba Corp | Generator field loss protector |
| CN101588153B (en) * | 2009-07-08 | 2011-05-04 | 浙江省电力公司 | Method of limiting low excitation |
| WO2014117279A1 (en) * | 2013-02-04 | 2014-08-07 | University Of Saskatchewan | Methods and apparatus for detection of generator faults |
| CN103454585B (en) * | 2013-08-27 | 2015-08-12 | 河海大学 | A kind of permagnetic synchronous motor loss of excitation method for diagnosing faults based on dead electricity residual voltage |
| CN104283191B (en) * | 2014-10-16 | 2017-08-11 | 华北电力大学 | Generator loss-of-excitation protection method and apparatus |
| CN107689622B (en) * | 2017-10-11 | 2019-09-03 | 安徽新力电业科技咨询有限责任公司 | The field loss protection acting characteristic curve for relating to the check of net definite value generates and check method |
| CN107658847B (en) * | 2017-10-20 | 2019-05-31 | 国家电网公司华中分部 | The low fiting tuning method for encouraging limitation and field loss protection based on power planes |
-
2018
- 2018-04-16 CN CN201810338072.5A patent/CN108736444B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038494A (en) * | 2018-08-16 | 2018-12-18 | 国电南瑞科技股份有限公司 | Phase modifier field loss protection excitation low-voltage judgment method |
| CN110061475A (en) * | 2019-03-22 | 2019-07-26 | 中国电力科学研究院有限公司 | A kind of phase modifier field loss protection method and system based on to systematic influence degree |
| CN112444745A (en) * | 2019-09-03 | 2021-03-05 | 南京南瑞继保工程技术有限公司 | Method and device for judging phase modulator field loss fault caused by pulse loss |
| CN110994535A (en) * | 2019-11-08 | 2020-04-10 | 国电南瑞科技股份有限公司 | Method and system for judging disconnection of excitation voltage measurement circuit |
| CN111509668A (en) * | 2020-04-23 | 2020-08-07 | 南京南瑞继保电气有限公司 | Phase modulator field loss protection method and device and electronic equipment |
| CN112290509A (en) * | 2020-09-16 | 2021-01-29 | 中国电力科学研究院有限公司 | Phase modulation magnetic loss protection method and system for preventing voltage fluctuation from causing malfunction |
| CN112290509B (en) * | 2020-09-16 | 2024-03-08 | 中国电力科学研究院有限公司 | Phase modulation loss magnetic protection method and system for preventing misoperation caused by voltage fluctuation |
| CN112952756A (en) * | 2021-03-04 | 2021-06-11 | 中国电力科学研究院有限公司 | Phase modulator loss-of-field protection method with self-adaptive fixed value adjustment |
| CN112952756B (en) * | 2021-03-04 | 2023-10-20 | 中国电力科学研究院有限公司 | Fixed value self-adaptive adjustment type loss-of-excitation protection method for camera |
| CN116780471A (en) * | 2023-08-24 | 2023-09-19 | 南方电网调峰调频发电有限公司 | Direct-current voltage-based symmetric loss-of-excitation protection method for variable-speed pumping and storage unit network side |
| CN116780471B (en) * | 2023-08-24 | 2023-11-24 | 南方电网调峰调频发电有限公司 | Direct-current voltage-based symmetric loss-of-excitation protection method for variable-speed pumping and storage unit network side |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108736444B (en) | 2021-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108736444A (en) | A kind of phase modifier field loss protection method and system | |
| Trinh et al. | Improvement of unified power quality conditioner performance with enhanced resonant control strategy | |
| Xiao et al. | Efficient approach to quantify commutation failure immunity levels in multi‐infeed HVDC systems | |
| Gan et al. | Fault diagnosis scheme for open‐circuit faults in switched reluctance motor drives using fast Fourier transform algorithm with bus current detection | |
| CN109412170A (en) | A kind of method and system determining phase modifier field loss protection based on reactive power | |
| AU2015252661B2 (en) | Relay protection method and device against LC parallel circuit detuning faults | |
| Raja et al. | Enhancement of voltage stability margin in radial distribution system with squirrel cage induction generator based distributed generators | |
| Arthishri et al. | Simplified methods for the analysis of self‐excited induction generators | |
| Emadi et al. | Fast active islanding detection method based on second harmonic drifting for inverter‐based distributed generation | |
| Saleh et al. | Dual‐setting characteristic for directional overcurrent relays considering multiple fault locations | |
| Hasani et al. | Fast and secure detection technique for loss of field occurrence in synchronous generators | |
| Manditereza et al. | Review of technical issues influencing the decoupling of DG converter design from the distribution system protection strategy | |
| Dekhandji et al. | Quantitative assessment of three phase supply voltage unbalance effects on induction motors | |
| Gupta et al. | Islanding detection scheme for converter‐based DGs with nearly zero non‐detectable zone | |
| Mishra et al. | Real power performance index and line stability index‐based management of contingency using firefly algorithm | |
| Guo et al. | A novel coordinated control approach for commutation failure mitigation in hybrid parallel-HVDC system with MMC-HVDC and LCC-HVDC | |
| Ostojić et al. | Out‐of‐step protection of synchronous generators based on a digital phase comparison in the time domain | |
| CN108879712A (en) | A kind of phase modifier field loss protection method and apparatus based on into phase rate detection criteria | |
| Varshney et al. | Performance characteristics and reliability assessment of self‐excited induction generator for wind power generation | |
| Camargo et al. | Novel multilevel STATCOM for power system stability enhancement on DFIG-based wind farms | |
| Mallick et al. | Self‐tuned fuzzy‐proportional–integral compensated zero/minimum active power algorithm based dynamic voltage restorer | |
| Kong et al. | Collaborative control strategy of power electronic transformer and fault current limiter in DC microgrid | |
| Heydt et al. | Power acceptability | |
| Habyarimana et al. | Reduction of Starting Current in Large Induction Motors | |
| Niknezhad et al. | Analysis of wind farm penetration on power swing detection in distance relays |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |