CN107394812A - The characteristic computer graphical generation of loss of synchronism protection and vibration method for early warning - Google Patents
The characteristic computer graphical generation of loss of synchronism protection and vibration method for early warning Download PDFInfo
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- CN107394812A CN107394812A CN201710566966.5A CN201710566966A CN107394812A CN 107394812 A CN107394812 A CN 107394812A CN 201710566966 A CN201710566966 A CN 201710566966A CN 107394812 A CN107394812 A CN 107394812A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
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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
- 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]
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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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- Control Of Eletrric Generators (AREA)
Abstract
The present invention is directed in existing power system; it is more complicated that the definite value generation element step-out characteristic curve of synchronous generator three is adjusted according to synchronous generator loss of synchronism protection; so that the track by synchronous generator terminal impedance in loss of synchronism protection characteristic curve figure; also the problem of being not easy to displaying directly perceived and judging oscillation property, there is provided a kind of characteristic computer graphical of loss of synchronism protection generates and vibration method for early warning.This method, it is included on the loss of synchronism protection characteristic curve for relating to the generation of net definite value, draws the real-time track curve of synchronous generator terminal impedance；Number, direction and the residence time in lens curve according to the real-time track curve through impedor Z1 convex lens curve, judge the oscillation property of synchronous generator.Root of the present invention realizes judgement and displaying of the computer software to synchronous generator oscillation property, realizes and pushes warning information to online nucleus correcting system according to the synchronous generator oscillation property order of severity.
Description
Technical field
The present invention relates to relay protection of power system correlative technology field, specifically, is related to a kind of loss of synchronism protection characteristic
The computer graphical generation of curve and vibration method for early warning.
Background technology
The management mode of the power system reform vertically integrated of changing over so that the independence and freedom of Generation Side
Greatly increase.The unit of overcritical Large Copacity constantly puts into operation therewith, and the quality of synchronous generator running status is by direct shadow
Ring the safe and stable operation to power system.At this stage, power system development power network exclusive data Transfer pipe and electricity
Net dispatch automated system, operation of power networks embodiment information effectively and can be gathered accurately.In net source coordination control direction
On, the constantly improve of the rapid development of computer technology and power specialty theory so that synchronous generator relates to net protection and limitation
Automatic Check become possibility.Effectively to carry out checking the property needed to currently vibrating to relating to net equipment loss of synchronism protection definite value
Matter is correctly differentiated.
Asynchronous operation caused by loss of synchronism protection reaction unit asynchronous oscillation.Oscillating current caused by step-out, which removes, causes heating
Outside, stator winding end is also made to be caused mechanical damage by very big stress；Voltage pulsation jeopardizes Safety of plant's power supply；Step-out
Operation can also bring impact to big axle.
During network system changes of operating modes, protection definite value may be not suitable with the current method of operation, it is necessary to fixed to protecting
Value is checked.Constantly put into operation with the unit of overcritical Large Copacity, the quality of synchronous generator running status will be direct
Have influence on the safe and stable operation of power system.Therefore, it is accurate to differentiate that stable oscillation stationary vibration is shaken with step-out when relating to the vibration of net equipment
Swing, it is most important to prevent that loss of synchronism protection from malfunctioning in stable oscillation stationary vibration.But current all kinds of softwares and check system fail pin
Step-out performance diagram is automatically generated to loss of synchronism protection characteristic, and without clear and definite vibration judgement instrument, the analysis of step-out can only
According to being accomplished manually, the real time operation mode of power network can not be considered.
In the prior art, definite value is adjusted according to synchronous generator loss of synchronism protection and automatically generates the element step-out of synchronous generator three
Characteristic curve（Graphically）Clearly simple and direct method is there is no, therefore, there is also be difficult to by loss of synchronism protection characteristic curve figure
The method that synchronous generator terminal impedance track intuitively showed and judged oscillation property and early warning.
The content of the invention
The present invention is directed in existing power system, and definite value generation synchronous generator is adjusted according to synchronous generator loss of synchronism protection
Three element step-out characteristic curves are more complicated so that pass through the rail of synchronous generator terminal impedance in loss of synchronism protection characteristic curve figure
Mark, the problem of being also not easy to displaying directly perceived and judge oscillation property, there is provided a kind of characteristic computer graphical of loss of synchronism protection
Generation and vibration method for early warning.
Technical problems to be solved needed for the present invention, it can be achieved through the following technical solutions：
The first aspect of the present invention, a kind of characteristic computer graph generating method of loss of synchronism protection, it is characterised in that including
Following steps：
Establish the R-X impedance planes using synchronous generator generator terminal as the origin of coordinates；
Definite value fineness angle is protected according to motor desynchronizing, the impedor Z1 of lens peculiarity adjusts impedance in I quadrant solstics
Za and impedance Z b is adjusted in III quadrant solstics, pass through the impedance line that origin draws blocker straight line impedor Z2；
According to action impedance setting valve Zc, the reactance line of the reactance line impedence element Z3 perpendicular to the impedance line is drawn；
One straight line L perpendicular to straight line Za-Zb of straight line Za-Zb middle point-rendering on the impedance line, according to loss of synchronism protection
Lens interior angle δ obtains impedor Z1 two convex lens curves and straight line L intersection point M and intersection point N, passing point Za, Zb, M and
Point Za, Zb, N draw out two convex lens curves respectively, complete three element loss of synchronism protection characteristic curves of generation.
In the present invention, the impedance line of the blocker straight line impedor Z2 is drawn, is comprised the following steps：
Definite value fineness angle is protected with motor desynchronizing, one is drawn and is with R axle clamps angle and crosses the straight line of origin, complete the resistance
The drafting of anti-line；
Found on straight line lens peculiarity impedor Z1 adjusted in I quadrant solstics impedance Z a and in III quadrant most
Far point adjusts impedance Z b, forms straight line Za-Zb.
The motor desynchronizing protection definite value fineness angle is blocker straight line impedor Z2 impedance line and the folder of R axles
Angle.
In the present invention, reactance line impedence element Z3 reactance line is drawn, including：The resistance of reactance line is found on straight line Za-Zb
Anti- element Z3 action impedance setting valve Zc, and the straight line perpendicular to straight line Za-Zb is drawn by Zc, form reactance line impedence element
Z3 reactance line.
In the present invention, two convex lens curves are drawn, including：By straight line Za-Zb middle point-rendering perpendicular to straight line Za-
Zb straight line L, the isosceles triangle that two angles are loss of synchronism protection lens interior angle δ, intersecting straight lines are drawn by side of straight line Za-Zb
L is in point M and point N.
In the present invention, before establishing using synchronous generator generator terminal as the R-X impedance planes of the origin of coordinates, comprise the following steps：
Electric network model, the power system operating mode profile data of common information model form are obtained from intelligent scheduling control system；
Input the whole network unit relates to net protection and limitation point information；
Establish and relate to dynamically associating between net protection and limitation object and definite value table.
The present invention relates to net definite value according to system, and the loss of synchronism protection of actual motion generator is automatically generated using computer program
Characteristic curve, it is easy to the locus of impedance of generator in image conversion displaying real time execution power network, is also generator out-of-step protection definite value
Check provides technical foundation.
The second aspect of the present invention, one kind judge synchronous generator oscillation property simultaneously according to loss of synchronism protection characteristic curve figure
The method of early warning, it is characterised in that comprise the following steps：
On the loss of synchronism protection characteristic curve for relating to the generation of net definite value, the real-time track curve of synchronous generator terminal impedance is drawn；
Stopped according to the real-time track curve through the number of impedor Z1 convex lens curve, direction and in lens curve
The time stayed, judge the oscillation property of synchronous generator；
According to the oscillation property of synchronous generator, warning information, and graphical representation alarm result are pushed to nucleus correcting system.
In the present invention, the oscillation property of the synchronous generator, including：
Desynchronizing state, state real-time track curve and sequentially pass through two convex lens curves from same direction, and geometric locus is in lens
Time in the anti-active region of form drag is not less than 50ms；
The vibration swinging condition of step-out, the real-time track curve are sequentially passed through into two convex lens curves from same direction,
And time of the geometric locus in lens shaped impedance active region is less than 50ms；
Recoverable stable oscillation stationary vibration swinging condition, the real-time track curve only run through a convex lens curve from different directions.
In the present invention, the real-time track curve sequentially passes through two convex lens curves, and geometric locus from same direction
When at least 50ms is in lens shaped impedance active region, synchronous generator is in desynchronizing state.
Heretofore described real-time track curve is synchronous generator desynchronizing state, and real-time track curve is located at the resistance of reactance line
When below anti-element Z3 reactance line, the oscillation center of the synchronous generator is located inside synchronous generator transformer group, is
Desynchronizing state in synchronous generator area, emergency alert information is pushed to online nucleus correcting system.
In the present invention, the desynchronizing state, including：
Desynchronizing state in synchronous generator area, the real-time track curve are located at below reactance line impedence element Z3 reactance line；
Desynchronizing state outside synchronous generator area, the real-time track curve are located above reactance line impedence element Z3 reactance line.
In the present invention, according to loss of synchronism protection oscillation property, division alarm grade, warning information is pushed to nucleus correcting system, is accused
The urgency level of alert information is as follows successively from high to low：
Desynchronizing state in synchronous generator area, loss of synchronism protection tripping operation；
Desynchronizing state outside synchronous generator area, loss of synchronism protection send signal；
It is common alarm i.e. by the vibration swinging condition of step-out, loss of synchronism protection is failure to actuate；
Recoverable stable oscillation stationary vibration swinging condition does not alert, and system is normal.
It is saturating with list by the use of the track of synchronous generator terminal impedance action as criterion when analyzing synchronous generator step-out
Mirror acting characteristic detects slip pole times, and the time that simple lens is slipped over by synchronous generator generator terminal measurement locus of impedance judges the journey of step-out
Degree.Track and the position relationship of reactance line impedence element using generator end impedance action, in the vibration for judging generator
Heart position.
The characteristic computer graphical of loss of synchronism protection of the present invention generates and vibration method for early warning, utilizes synchronous generator
Loss of synchronism protection adjust definite value by computer software complete loss of synchronism protection characteristic it is graphical, according to the real-time of power system operating mode
Section information measures synchronous generator terminal impedance, describes the track of synchronous generator terminal impedance action, realizes computer software
Judgement and displaying to synchronous generator oscillation property, realize according to the synchronous generator oscillation property order of severity to online school
Core system pushes warning information.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the characteristic computer graphical product process figure of loss of synchronism protection of the present invention.
Fig. 2 is three element loss of synchronism protection characteristic real-time check schematic diagrames of the invention.
Fig. 3 is synchronous generator oscillation property of the present invention judgement and early warning flow chart.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect of the present invention are easy to understand, with reference to tool
Body illustrates, and the present invention is expanded on further.
Idea of the invention is that by the analysis to existing relay protection of power system demand, find according to synchronous hair
The motor desynchronizing protection seting definite value generation element step-out characteristic curve of synchronous generator three is more complicated so that passes through loss of synchronism protection
Synchronous generator terminal impedance track in characteristic curve figure, the problem of being also not easy to displaying directly perceived and judge oscillation property, pass through
The present invention provides a kind of characteristic computer graphical generation of loss of synchronism protection and vibration determination methods to solve the above problems.
Referring to Fig. 1 and Fig. 2, the present invention relates to net definite value generation loss of synchronism protection characteristic curve, specifically refers to synchronous generator
The definite value generation element step-out characteristic curve of synchronous generator three is adjusted in machine loss of synchronism protection, before technical scheme is illustrated,
Simply introduced firstly the need of the concept to three element losss of synchronism protection.
Specifically, three element losss of synchronism protection are made up of following three parts：
（1）The impedor Z1 of lens peculiarity
For impedor Z1, it adjusts impedance Z a in I quadrant solstics, and adjusts impedance in III quadrant solstics
Zb is known definite value.
（2）Blocker straight line impedor Z2
The angle of blocker straight line impedor Z2 impedance line and the R axles of R-X impedance planes is that angle is loss of synchronism protection
Definite value fineness angle.
（3）Reactance line impedence element Z3
Reactance line impedence element Z3 action impedances setting valve is Zc, and reactance line impedence element Z3 reactance line and blocker straight line hinder
Anti- element Z2 impedance line is vertical.
（4）Lens interior angle δ
Lens interior angle is smaller, and protection timing is more accurate, ensures minimum load impedance Z Lmin during Synchronous generator normal operation
Outside lens.
The present invention can first obtain grid model data, obtain before carrying out relating to net definite value generation loss of synchronism protection characteristic curve
（Renewal）The definite value of network school's core is related to, specifically：
Electric network model, the power system operating mode profile data of common information model form are obtained from intelligent scheduling control system；
Input the whole network unit relates to net protection and limitation point information；
Establish and relate to dynamically associating between net protection and limitation object and definite value table.
After completing above-mentioned preparation, start formally to carry out relating to net definite value generation loss of synchronism protection characteristic curve, including it is as follows
Step：
First, the R-X impedance planes using synchronous generator generator terminal as the origin of coordinates are established.
Then, definite value fineness angle is protected according to motor desynchronizing（That is blocker straight line impedor Z2 impedance line and R axles
Angle）, the impedor Z1 of lens peculiarity adjusts impedance Z a in I quadrant solstics and adjusted in III quadrant solstics
Impedance Z b, blocker straight line impedor Z2 impedance line is drawn by origin, in the present embodiment, is comprised the concrete steps that：
Definite value fineness angle is protected with motor desynchronizing, one is drawn and is with R axle clamps angle and crosses the straight line of origin, complete blocker
The drafting of straight line impedor Z2 impedance line；
Found on straight line lens peculiarity impedor Z1 adjusted in I quadrant solstics impedance Z a and in III quadrant most
Far point adjusts impedance Z b, forms straight line Za-Zb.
Then, according to action impedance setting valve Zc, the electricity of the impedance line perpendicular to blocker straight line impedor Z2 is drawn
Anti- line impedence element Z3 reactance line, specifically, the action impedance that reactance line impedence element Z3 is found on straight line Za-Zb are whole
Definite value Zc, and the straight line perpendicular to straight line Za-Zb is drawn by Zc, it is consequently formed reactance line impedence element Z3 reactance line.
Finally, on impedance line straight line Za-Zb one straight line L perpendicular to straight line Za-Zb of middle point-rendering, according to step-out
The intersection point M and intersection point N of protection lens interior angle δ acquisition impedors Z1 two convex lens curves and straight line L, passing point Za, Zb,
M and point Za, Zb, N draw out two convex lens curves respectively, and concrete operations are, by straight line Za-Zb middle point-rendering perpendicular to
Straight line Za-Zb straight line L, the isosceles triangle that two angles are loss of synchronism protection lens interior angle δ is drawn by side of straight line Za-Zb,
Intersecting straight lines L completes three element loss of synchronism protection characteristic curves of generation in point M and point N.Present invention employs relatively simple side
Formula, using synchronous generator loss of synchronism protection adjust definite value by computer software complete loss of synchronism protection characteristic it is graphical.
Adjusted according to synchronous generator loss of synchronism protection after definite value determines the element step-out characteristic curve figure of generator three,
Synchronous generator oscillation property can be judged according to the characteristic curve figure of acquisition.Equally judge synchronous generator in the elaboration present invention
Before machine oscillation property method, the division that region how is carried out to loss of synchronism protection characteristic curve is first introduced.Three element losss of synchronism protection are special
In linearity curve figure, reactance line impedence element Z3 reactance line divides the plane into two regions, reactance line impedence element Z3 reactance
Line poincare half plane represents that lower half-plane is represented with II areas with I areas, then, the impedor Z1 of lens peculiarity two convex lens
Curve and blocker straight line impedor Z2 impedance line synthesize tetra- regions of OL, IL, IR, OR in II district's groups, similarly, in I areas
In can also be combined into four regions, the mode of combination is similar.
It is to relate to the loss of synchronism protection characteristic curve of net definite value generation in the basic logic for judging synchronous generator oscillation property
On, the real-time track curve of synchronous generator terminal impedance is drawn, by judging to implement the motion conditions of geometric locus, to realize pair
The judgement of synchronous generator motor oscillation property.Specifically, after obtaining grid model data, system can be controlled from intelligent scheduling
System obtains power network Real-time Power Flow data, obtains generator end real-time impedance, and then special in the three element losss of synchronism protection for relating to net equipment
The real-time track for the extreme impedance that generates electricity is depicted in linearity curve figure.
For example, when the real-time track curve of synchronous generator terminal impedance passes through OR → IR → IL → OL successively（Otherwise by OL
→IL→IR→OR）, and geometric locus at least 50ms is in lens shaped impedance active region（I.e. geometric locus is in lens shaped impedance
Time in active region is not less than 50ms）, it is believed that synchronous generator is in desynchronizing state.In the embodiment shown in Figure 2, show
Anticipate two kinds of different desynchronizing states, wherein, real-time track curve is located at below reactance line impedence element Z3 reactance line, I
Be referred to as synchronous generator area in desynchronizing state, in the present embodiment, implement geometric locus in lens impedance active region
Time is 55ms；Another kind, real-time track curve are located above reactance line impedence element Z3 reactance line, and we term it same
The outer desynchronizing state of dynamo region is walked, in the present embodiment, it is 60ms to implement time of the geometric locus in lens impedance active region.
In another example shown in Fig. 2, the real-time track curve of synchronous generator terminal impedance pass through successively OR →
IR → IL → OL, but geometric locus at least only has 45ms in lens shaped impedance active region, it is believed that and synchronous generator is in will
The oscillatory regime of step-out.In fact, as long as real-time track curve sequentially passes through two convex lens curves, and track from same direction
Time of the curve in lens shaped impedance active region, which is less than 50ms, can think that synchronous generator is in i.e. by the vibration of step-out
State.
In addition, in another example shown in Fig. 2, the real-time track curve of synchronous generator terminal impedance passes through successively
OR → IR → OR, geometric locus is through side lens shaped impedance but is not passed from opposite side lens shaped impedance, then disregards sliding pole；Together
Reason, if that pass through successively is OR → IR → IL → IR → OR, also disregards sliding pole, at this time, it is believed that synchronous generator
Stable oscillation stationary vibration swinging condition in restorability, at this moment also do not considering real-time track curve in lens shaped impedance active region
Time, no matter the time is how many, all thinks that synchronous generator is in the stable oscillation stationary vibration swinging condition of restorability.It is appreciated that
, the similar type of passing through for disregarding sliding pole is a lot, such as is passed through since OL, passes through foregoing description, this area
Technical staff has been appreciated that the present invention, and other disregard the situation of sliding pole, are not repeated herein.
It may know that by summarizing, essence of the invention is to judge synchronous generator terminal impedance real-time track curve, default
Number and the direction of impedor Z1 convex lens curve are passed through in time, further according to number and direction, obtains synchronous generator
Oscillation property.Only when real-time track curve sequentially passes through two convex lens curves from same direction, and geometric locus is at least
When having 50ms in lens shaped impedance active region, just think that synchronous generator is in desynchronizing state, otherwise it is assumed that synchronous generator
In i.e. by the oscillatory regime of step-out；Other situations, when real-time track curve only runs through a convex lens curve from different directions,
Think that synchronous generator is in the stable oscillation stationary vibration swinging condition of restorability.
In addition, the oscillation center position of synchronous generator is also relevant with the real-time track curve of synchronous generator terminal impedance,
Specifically：When real-time track curve is located at reactance line impedence element Z3 reactance line top, in the vibration of synchronous generator
The heart is located at outside synchronous generator transformer group（Outside i.e. foregoing area）；Conversely, real-time track curve is located at reactance line impedence member
When below part Z3 reactance line, the oscillation center of synchronous generator is located inside synchronous generator transformer group（I.e. foregoing area
It is interior）.In foregoing embodiment, the content of description is the situation that oscillation center is located inside synchronous generator transformer group, right
It is also similar to be located in oscillation center outside synchronous generator transformer group, based on foregoing introduction, those skilled in the art
It will be seen that oscillation center is located at principle and determination methods outside synchronous generator transformer group, equally it is not repeated herein.
With reference to Fig. 2 referring back to Fig. 3, loss of synchronism protection（Early warning）Basic logic be, loss of synchronism protection only in asynchronous oscillation situation
Lower action, after loss of synchronism protection action, only oscillation center is just acted in tripping operation in generator, and oscillation center is in generator
Signal is typically only sent when outside.So, according to loss of synchronism protection oscillation property, division alarm grade, alarm letter is pushed to system
Breath.According to loss of synchronism protection oscillation property, division alarm grade, warning information, the urgent journey of warning information are pushed to nucleus correcting system
Degree is as follows successively from high to low：Desynchronizing state is critical alarm in synchronous generator area, and loss of synchronism protection is tripped；Synchronous generator area
Outer desynchronizing state is high severity alarm, and loss of synchronism protection sends signal；It is common alarm i.e. by the vibration swinging condition of step-out, step-out is protected
Shield is failure to actuate；Recoverable stable oscillation stationary vibration swinging condition does not alert, and system is normal.
The present invention measures synchronous generator terminal impedance according to the real-time section information of power system operating mode, describes synchronous generator
The track of generator terminal impedance action, realizes judgement and displaying of the computer software to synchronous generator oscillation property.It is same in analysis
When walking generator step-out, by the use of the track of synchronous generator terminal impedance action as criterion, detected and slided with simple lens acting characteristic
Pole number, the time that simple lens is slipped over by synchronous generator generator terminal measurement locus of impedance judge the degree of step-out.
Only preferred embodiments of the present invention are described above, but are not to be construed as limiting the scope of the invention.This
Invention is not only limited to above example, and its concrete structure allows to change.In a word, all guarantors in independent claims of the present invention
The various change made in the range of shield is within the scope of the present invention.
Claims (10)
1. the characteristic computer graph generating method of loss of synchronism protection, it is characterised in that comprise the following steps：
Establish the R-X impedance planes using synchronous generator generator terminal as the origin of coordinates；
Definite value fineness angle is protected according to motor desynchronizing, the impedor Z1 of lens peculiarity adjusts impedance in I quadrant solstics
Za and impedance Z b is adjusted in III quadrant solstics, pass through the impedance line that origin draws blocker straight line impedor Z2；
According to action impedance setting valve Zc, the reactance line of the reactance line impedence element Z3 perpendicular to the impedance line is drawn；
One straight line L perpendicular to straight line Za-Zb of straight line Za-Zb middle point-rendering on the impedance line, according to loss of synchronism protection
Lens interior angle δ obtains impedor Z1 two convex lens curves and straight line L intersection point M and intersection point N, passing point Za, Zb, M and
Point Za, Zb, N draw out two convex lens curves respectively, complete three element loss of synchronism protection characteristic curves of generation.
2. the characteristic computer graph generating method of loss of synchronism protection according to claim 1, it is characterised in that：Draw
The impedance line of the blocker straight line impedor Z2, comprises the following steps：
Definite value fineness angle is protected with motor desynchronizing, one is drawn and is with R axle clamps angle and crosses the straight line of origin, complete the resistance
The drafting of anti-line；
Found on straight line lens peculiarity impedor Z1 adjusted in I quadrant solstics impedance Z a and in III quadrant most
Far point adjusts impedance Z b, forms straight line Za-Zb.
3. the characteristic computer graph generating method of loss of synchronism protection according to claim 2, it is characterised in that：It is described
Motor desynchronizing protection definite value fineness angle is blocker straight line impedor Z2 impedance line and the angle of R axles.
4. the characteristic computer graph generating method of loss of synchronism protection according to claim 1, it is characterised in that：Draw
Reactance line impedence element Z3 reactance line, including：The action impedance that reactance line impedence element Z3 is found on straight line Za-Zb is adjusted
Value Zc, and the straight line perpendicular to straight line Za-Zb is drawn by Zc, form reactance line impedence element Z3 reactance line.
5. the characteristic computer graph generating method of loss of synchronism protection according to claim 1, it is characterised in that：Draw
Two convex lens curves, including：By straight line Za-Zb middle point-rendering perpendicular to straight line Za-Zb straight line L, with straight line Za-Zb
The isosceles triangle that two angles are loss of synchronism protection lens interior angle δ is drawn for side, intersecting straight lines L is in point M and point N.
6. the characteristic computer graph generating method of loss of synchronism protection according to claim 1, it is characterised in that：Establish
Before using synchronous generator generator terminal as the R-X impedance planes of the origin of coordinates, comprise the following steps：
Electric network model, the power system operating mode profile data of common information model form are obtained from intelligent scheduling control system；
Input the whole network unit relates to net protection and limitation point information；
Establish and relate to dynamically associating between net protection and limitation object and definite value table.
7. the method for synchronous generator oscillation property and early warning, the loss of synchronism protection are judged according to loss of synchronism protection characteristic curve figure
Characteristic curve is using any described method generation of claim 1 to 6, it is characterised in that comprises the following steps：
On the loss of synchronism protection characteristic curve for relating to the generation of net definite value, the real-time track curve of synchronous generator terminal impedance is drawn；
Stopped according to the real-time track curve through the number of impedor Z1 convex lens curve, direction and in lens curve
The time stayed, judge the oscillation property of synchronous generator；
According to the oscillation property of synchronous generator, warning information, and graphical representation alarm result are pushed to nucleus correcting system.
8. according to claim 7 judge synchronous generator oscillation property and early warning according to loss of synchronism protection characteristic curve figure
Method, it is characterised in that：The oscillation property of the synchronous generator, including：
Desynchronizing state, state real-time track curve and sequentially pass through two convex lens curves from same direction, and geometric locus is in lens
Time in the anti-active region of form drag is not less than 50ms；
The vibration swinging condition of step-out, the real-time track curve are sequentially passed through into two convex lens curves from same direction,
And time of the geometric locus in lens shaped impedance active region is less than 50ms；
Recoverable stable oscillation stationary vibration swinging condition, the real-time track curve only run through a convex lens curve from different directions.
9. according to claim 8 judge synchronous generator oscillation property and early warning according to loss of synchronism protection characteristic curve figure
Method, it is characterised in that：The desynchronizing state, including：
Desynchronizing state in synchronous generator area, the real-time track curve are located at below reactance line impedence element Z3 reactance line；
Desynchronizing state outside synchronous generator area, the real-time track curve are located above reactance line impedence element Z3 reactance line.
10. according to claim 9 judge synchronous generator oscillation property and pre- according to loss of synchronism protection characteristic curve figure
Alert method, it is characterised in that：According to loss of synchronism protection oscillation property, division alarm grade, warning information is pushed to nucleus correcting system,
The urgency level of warning information is as follows successively from high to low：
Desynchronizing state in synchronous generator area, loss of synchronism protection tripping operation；
Desynchronizing state outside synchronous generator area, loss of synchronism protection send signal；
It is common alarm i.e. by the vibration swinging condition of step-out, loss of synchronism protection is failure to actuate；
Recoverable stable oscillation stationary vibration swinging condition does not alert, and system is normal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566966.5A CN107394812A (en) | 2017-07-12 | 2017-07-12 | The characteristic computer graphical generation of loss of synchronism protection and vibration method for early warning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710566966.5A CN107394812A (en) | 2017-07-12 | 2017-07-12 | The characteristic computer graphical generation of loss of synchronism protection and vibration method for early warning |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729930A (en) * | 2019-10-31 | 2020-01-24 | 国网黑龙江省电力有限公司电力科学研究院 | Turbine generator low excitation limit curve setting method based on static stability impedance circle |
| CN113394749A (en) * | 2021-06-29 | 2021-09-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Loss-of-field and loss-of-step protection checking method based on real-time operation information |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7116074B2 (en) * | 2004-08-20 | 2006-10-03 | Ping-Hung Kuo | Stepper motor accelerating system and method |
| CN105004993A (en) * | 2015-05-28 | 2015-10-28 | 西北工业大学 | Apparatus and method for testing force-frequency characteristic of linear stepping motor |
-
2017
- 2017-07-12 CN CN201710566966.5A patent/CN107394812A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7116074B2 (en) * | 2004-08-20 | 2006-10-03 | Ping-Hung Kuo | Stepper motor accelerating system and method |
| CN105004993A (en) * | 2015-05-28 | 2015-10-28 | 西北工业大学 | Apparatus and method for testing force-frequency characteristic of linear stepping motor |
Non-Patent Citations (1)
| Title |
|---|
| 丁建良: "基于机网协调的大型机组的保护研究", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110729930A (en) * | 2019-10-31 | 2020-01-24 | 国网黑龙江省电力有限公司电力科学研究院 | Turbine generator low excitation limit curve setting method based on static stability impedance circle |
| CN113394749A (en) * | 2021-06-29 | 2021-09-14 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Loss-of-field and loss-of-step protection checking method based on real-time operation information |
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