CN107528287B - A kind of optimization method and system of inverse time-lag protection - Google Patents
A kind of optimization method and system of inverse time-lag protection Download PDFInfo
- Publication number
- CN107528287B CN107528287B CN201710940535.0A CN201710940535A CN107528287B CN 107528287 B CN107528287 B CN 107528287B CN 201710940535 A CN201710940535 A CN 201710940535A CN 107528287 B CN107528287 B CN 107528287B
- Authority
- CN
- China
- Prior art keywords
- time
- protective device
- protection
- amendment
- voltage
- 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.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of optimization method of inverse time-lag protection and systems, comprising: according to station domain information, inverse time-lag protection curvilinear equation and default selective time difference, judges whether inverse time-lag protection has selectivity in the power network topology system where Location；When inverse time-lag protection does not have selectivity, according to station domain information, the amendment voltage of high voltage side of transformer in power network topology system is calculated；Anti-time limit characteristic curvilinear equation is corrected by the amendment voltage and Remedy percent of high voltage side of transformer, obtains the first amendment anti-time limit characteristic curvilinear equation；It according to the first amendment anti-time limit characteristic curvilinear equation, stands domain information and default selective time difference, adjusts Remedy percent, optimization inverse time-lag protection makes it have selectivity and quick-action.The present invention is based on station domain informations to share, and carries out dynamic compensation to anti-time limit characteristic curvilinear equation using high voltage side of transformer information of voltage, so that inverse time-lag protection has selectivity and quick-action, has preferable practical application value.
Description
Technical field
The present invention relates to technical field of relay protection, in particular to the optimization method and system of a kind of inverse time-lag protection.
Background technique
The application of Current Domestic intelligent substation gradually increases, but the configuration protected still inherits traditional relay protection
Feature, the back-up protection to main protection and the multistage cooperation of each primary equipment configuration fast trip, protection and its associated loop
Double sets are configured and are completely independent.From As-Is, there is no utilize intelligent power transformation for the relaying configuration of current intelligent substation
The some technical advantages stood optimize back-up protection, however it remains the intrinsic defect of traditional back-up protection；By fixed
The cooperation of value and time are slow to guarantee selectivity, movement speed；Each element configures a variety of back-up protection protection system structures
Complexity, equipment investment are high.
Summary of the invention
The present invention provides a kind of optimization method of inverse time-lag protection and systems, are asked with solving or partially solving above-mentioned technology
Topic.
The technical scheme to solve the above technical problems is that a kind of optimization method of inverse time-lag protection, comprising:
Step 1, according to station domain information, inverse time-lag protection curvilinear equation and default selective time difference, judge line fault
Whether inverse time-lag protection has selectivity in power network topology system where position；
Step 2, when the inverse time-lag protection do not have selectivity when, according to the station domain information, calculate the power grid and open up
Flutter the amendment voltage of high voltage side of transformer in system；
Step 3 corrects the anti-time limit characteristic song by the amendment voltage and Remedy percent of the high voltage side of transformer
Line equation obtains the first amendment anti-time limit characteristic curvilinear equation；
Step 4 corrects anti-time limit characteristic curvilinear equation, the station domain information and the default selectivity according to described first
Time difference adjusts the Remedy percent, optimizes the inverse time-lag protection and makes it have selectivity and quick-action.
The beneficial effects of the present invention are: proposing to believe using high voltage side of transformer voltage the present invention is based on station domain information is shared
The protection prioritization scheme for carrying out dynamic compensation to anti-time limit characteristic curvilinear equation is ceased, that is, uses on high-tension side amendment voltage and compensation
Percentage is modified anti-time limit characteristic curvilinear equation, the value of Remedy percent is adjusted by dynamic, so that power network topology system
The time difference of the operating time of protection of each protective device is greater than the default selective time difference in system, and inverse time-lag protection is had
There is quick-action, can effectively compensate for the limitation of inverse time over-current protection scheme, the performance boost to inverse-time overcurrent protection
Obviously, there is preferable practical application value.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the station domain information includes: that the Location occurs to open up when line fault by the power grid
Flutter the line current of each protective device in system, the line fault occur after each protective device protection starting electricity
Stream, the line fault measurement voltage at each protective device both ends and the line fault generation preceding electricity when occurring
The operating voltage of net topology system.
Further, the step 1 includes:
Step 1.1, according to the station domain information, calculate separately the measurement voltage at each protective device both ends and described
The ratio of operating voltage, the ratio are this ground voltage of each protective device；
Step 1.2 corrects its corresponding anti-time limit characteristic curvilinear equation by described ground voltage respectively, obtains based on this
The modified second amendment anti-time limit characteristic curvilinear equation of ground voltage；
Step 1.3 corrects anti-time limit characteristic curvilinear equation, the station domain information and the default selection according to described second
Property the time difference, judge whether the inverse time-lag protection has selectivity, if so, complete inverse time-lag protection optimization, if it is not, execute
The step 2,
Wherein, the second amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, i represents the number of the protective device, AiRepresent the corresponding time coefficient of i-th of protective device, IsiIt represents
Pass through the line current of i-th of protective device, I after line fault generationpu.iThe line fault is represented to occur
The protection starting current of i-th of protective device, n represent proportion index afterwards,Represent the local electricity of i-th of protective device
Pressure, tuiRepresent the first corrective action time of i-th of protective device after line fault generation.
Further, the station domain information further include: the measurement voltage of high voltage side of transformer in the power network topology system；
Then the step 2 includes:
When the inverse time-lag protection do not have selectivity when, calculate the high voltage side of transformer measurement voltage and the work
Make the ratio of voltage, which is the amendment voltage of the high voltage side of transformer；
Then the step 3 includes:
The anti-time limit characteristic curvilinear equation is corrected by the amendment voltage and Remedy percent of the high voltage side of transformer,
Obtain the first amendment anti-time limit characteristic curvilinear equation, the first amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, tbiThe second corrective action time of i-th of protective device after line fault generation is represented, P is represented
The Remedy percent, the P initial value are 1,Represent the amendment voltage of the high voltage side of transformer.
Further, the step 4 includes:
Step 4.1 corrects anti-time limit characteristic curvilinear equation, the station domain information and the default selection according to described first
The property time difference, judge whether the inverse time-lag protection has selectivity；
Step 4.2, if so, the first default adjustment interval that the Remedy percent is successively successively decreased since 1, until described
Difference is equal to the default selective time difference, is optimized with reaching quick-action, completes the optimization of inverse time-lag protection；
Step 4.3, if it is not, by the Remedy percent since 1 the second default adjustment interval incremented by successively, until described
Difference completes the optimization of inverse time-lag protection equal to the default selective time difference to reach selective requirement.
To solve technical problem of the invention, a kind of optimization system of inverse time-lag protection is additionally provided, comprising:
First judgment module, for sentencing according to station domain information, inverse time-lag protection curvilinear equation and default selective time difference
Whether inverse time-lag protection has selectivity in power network topology system where disconnected Location；
First computing module, for according to the station domain information, calculating when the inverse time-lag protection does not have selectivity
The amendment voltage of high voltage side of transformer in the power network topology system；
First correction module is corrected described anti-for the amendment voltage and Remedy percent by the high voltage side of transformer
Selectivity characteristic curvilinear equation obtains the first amendment anti-time limit characteristic curvilinear equation；
Optimization module, for according to the first amendment anti-time limit characteristic curvilinear equation, the station domain information and described pre-
If the selective time difference, adjusting the Remedy percent, optimizing the inverse time-lag protection and make it have selectivity and quick-action.
Further, the station domain information includes: that the Location occurs to open up when line fault by the power grid
Flutter the line current of each protective device in system, the line fault occur after each protective device protection starting electricity
Stream, the line fault measurement voltage at each protective device both ends and the line fault generation preceding electricity when occurring
The operating voltage of net topology system.
Further, the first judgment module is specifically used for:
According to the station domain information, calculate separately each protective device both ends measurement voltage and the operating voltage
Ratio, the ratio be each protective device this ground voltage；It is corresponding anti-that its is corrected respectively by described ground voltage
Selectivity characteristic curvilinear equation is obtained based on the modified second amendment anti-time limit characteristic curvilinear equation of this ground voltage；According to described
Two amendment anti-time limit characteristic curvilinear equations, the station domain information and the default selective time difference, judge that the inverse time lag protects
Whether shield has selectivity, if so, completing the optimization of inverse time-lag protection, refers to if it is not, sending to calculate to first computing module
It enables, wherein the second amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, i represents the number of the protective device, AiRepresent the corresponding time coefficient of i-th of protective device, IsiIt represents
Pass through the line current of i-th of protective device, I after line fault generationpu.iThe line fault is represented to occur
The protection starting current of i-th of protective device, n represent proportion index afterwards,Represent the local electricity of i-th of protective device
Pressure, tuiRepresent the first corrective action time of i-th of protective device after line fault generation.
Further, the station domain information based on the first judgment module further include: in the power network topology system
The measurement voltage of high voltage side of transformer；
Then first computing module is specifically used for:
When the inverse time-lag protection do not have selectivity when, calculate the high voltage side of transformer measurement voltage and the work
Make the ratio of voltage, which is the amendment voltage of the high voltage side of transformer；
Then first correction module is specifically used for:
The anti-time limit characteristic curvilinear equation is corrected by the amendment voltage and Remedy percent of the high voltage side of transformer,
Obtain the first amendment anti-time limit characteristic curvilinear equation, the first amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, tbiThe second corrective action time of i-th of protective device after line fault generation is represented, P is represented
The Remedy percent, the P initial value are 1,Represent the amendment voltage of the high voltage side of transformer.
Further, the optimization module is specifically used for:
According to the first amendment anti-time limit characteristic curvilinear equation, the station domain information and the default selective time
Difference, judges whether the inverse time-lag protection has selectivity；If so, the Remedy percent is successively successively decreased first since 1
Default adjustment interval, until the difference completes inverse time equal to the default selective time difference to reach quick-action optimization
Limit the optimization of protection；If it is not, by the Remedy percent, the incremented by successively second default adjust is spaced since 1, until the difference
Value completes the optimization of inverse time-lag protection equal to the default selective time difference to reach selective requirement.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of the optimization method of inverse time-lag protection provided by one embodiment of the present invention；
Fig. 2 is the process of step 110 in a kind of optimization method for inverse time-lag protection that another embodiment of the present invention provides
Schematic diagram；
Fig. 3 is the structural schematic diagram for the power network topology system that another embodiment of the present invention provides；
Fig. 4 is the process of step 140 in a kind of optimization method for inverse time-lag protection that another embodiment of the present invention provides
Schematic diagram；
Fig. 5 is a kind of schematic diagram of the optimization system of inverse time-lag protection provided by one embodiment of the present invention.
In attached drawing, parts list represented by the reference numerals are as follows:
1, power supply, the 2, first bus, the 3, second bus, 4, third bus, 5, transformer, 6, first protective devices, 7,
Second protective device, 8, third protective device.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
Embodiment one
A kind of optimization method 100 of inverse time-lag protection, as shown in Figure 1, comprising:
Step 110, according to station domain information, inverse time-lag protection curvilinear equation and default selective time difference, judge route therefore
Whether inverse time-lag protection has selectivity in power network topology system where barrier position.
Step 120, when inverse time-lag protection do not have selectivity when, according to station domain information, calculate power network topology system in become
The on high-tension side amendment voltage of depressor
Step 130 corrects anti-time limit characteristic curvilinear equation by the amendment voltage and Remedy percent of high voltage side of transformer,
Obtain the first amendment anti-time limit characteristic curvilinear equation.
Step 140 corrects anti-time limit characteristic curvilinear equation according to first, stands domain information and default selective time difference, adjusts
Whole Remedy percent, optimization inverse time-lag protection make it have selectivity and quick-action.
It should be noted that selectivity refers in power network topology system except the protective device that distance line abort situation is nearest
The operating time of protection of other each protective devices in addition and the protection of the nearest protective device of distance line abort situation are dynamic
The difference for making the time is greater than or equal to the default selective time difference, and quick-action refers in power network topology system except distance line failure
The operating time of protection and distance line abort situation of other each protective devices other than the nearest protective device in position are nearest
The difference of operating time of protection of protective device be just equal to the default selective time difference.Therefore, selective when meeting
Shi Kezai requires by adjusting Remedy percent to reach quick-action, by carrying out dynamic compensation to anti-time limit characteristic curvilinear equation
Prioritization scheme so that inverse-time overcurrent protection have preferable performance.
Inverse time-lag protection will lose selectivity in power network topology system, and each protective device can after line failure
Issue protection signal and carry out tripping respective circuit breakers, fault coverage is caused to expand, it is therefore desirable to the selectivity of inverse time-lag protection into
Row optimization.
The present embodiment is based on station domain information and shares, and proposes using high voltage side of transformer information of voltage to anti-time limit characteristic curve
Equation carries out the protection prioritization scheme of dynamic compensation, i.e., using on high-tension side amendment voltage and Remedy percent to anti-time limit characteristic
Curvilinear equation is modified, and the value of Remedy percent is adjusted by dynamic, so that removing distance line failure in power network topology system
The operating time of protection and distance line abort situation of other each protective devices other than the nearest protective device in position are nearest
The difference of operating time of protection of protective device be greater than or equal to the default selective time difference so that inverse time-lag protection has choosing
Selecting property and quick-action can effectively compensate for the limitation of inverse time over-current protection scheme, to the performance of inverse-time overcurrent protection
It is promoted obviously, there is preferable practical application value.
Embodiment two
On the basis of example 1, domain information of standing includes: that Location occurs to open up when line fault by power grid
Flutter the line current of each protective device in system, line fault occur after each protective device protection starting current, route
The operating voltage of failure measurement voltage at each protective device both ends and line fault generation preceding power network topology system when occurring.
Embodiment three
On the basis of embodiment one or embodiment two, as shown in Fig. 2, step 110 includes:
Step 111, according to station domain information, calculate separately each protective device both ends measurement voltage and operating voltage ratio
Value, the ratio are this ground voltage of each protective device.
Step 112 corrects its corresponding anti-time limit characteristic curvilinear equation by this ground voltage respectively, obtains based on local electricity
Press modified second amendment anti-time limit characteristic curvilinear equation.
Step 113 corrects anti-time limit characteristic curvilinear equation according to second, stands domain information and default selective time difference, sentences
Whether disconnected inverse time-lag protection has selectivity, if so, the optimization of inverse time-lag protection is completed, if it is not, executing step 120.
Wherein, the second amendment anti-time limit characteristic curvilinear equation are as follows:
Inverse time-lag protection curvilinear equation are as follows:
I represents the number of protective device, AiRepresent the corresponding time coefficient of i-th of protective device, IsiIt represents in route event
Barrier passes through the line current of i-th of protective device, I after occurringpu.iRepresent the protection of i-th of protective device after line fault occurs
Starting current, n represent proportion index,Represent this ground voltage of i-th of protective device, tuiIt represents after line fault generation
First corrective action time of i-th of protective device, t represent the actuation time of i-th of protective device after line fault generation.
In addition, it is necessary to illustrate, in step 113, judges whether inverse time-lag protection has selectivity, specifically include: root
According to station domain information and the second amendment anti-time limit characteristic curvilinear equation, the actuation time of each protective device is calculated separately.It counts respectively
Calculate the actuation time of each protective device in power network topology system in addition to the nearest protective device of distance line abort situation
With the difference of the actuation time of nearest protective device.Judge whether difference is respectively greater than the default selective time difference, if it is not, then
Inverse time-lag protection does not have selectivity.
The nearest protective device of distance line abort situation refer to failure occur after current in the fault point to surrounding flow when most
The protective device first encountered, namely the nearest protective device of distance fault point on the topology.As long as there is an above-mentioned difference
No more than the default selective time difference, inverse time-lag protection does not just have selectivity.When inverse time-lag protection loses selective, Ge Gebao
Protection unit can issue protection signal and carry out tripping respective circuit breakers, cause fault coverage to expand, it is therefore desirable to judge each protection
The operating time of protection of device is poor.
This ground voltage amendment at each protective device can shorten inverse time-lag protection actuation time, optimize protective value.
However, when electric system major network all configures the current protection of anti-time limit characteristic, for certain topological structure of electric, based on each
Limitation will be present in the cooperation of this ground voltage amendment inverse time over-current protection at protective device, it is therefore desirable to which judgement is repaired again
Whether the inverse time-lag protection after just has selectivity, if it is not, the amendment voltage for carrying out high voltage side of transformer is modified.
As shown in figure 3, a power network topology system (topological structure), carries out inverse time-lag protection for the power network topology system
Optimization:
Step 1: first since first protective device 6 (protection S1), starting current is by S1 when avoiding operating normally
Maximum load current adjusting be Ipu.1；When most serious short trouble occurs for first protective device outlet, in fault current
I1.maxUnder the action of, first protective device answers snap action, and operation time limit is the intrinsic actuation time of relayRoot
According to anti-time limit characteristic curvilinear equation, the time coefficient of first protective device is obtained, i.e.,
The anti-time limit characteristic curve of such first protective device can be identified as:
Step 2: next the second protective device of adjusting 7 (protection S2), starting current is passed through as when avoiding and operating normally
The maximum load current adjusting of S1 and S2 is Ipu.2.And it is the selectivity for protecting S2 and third protective device 8 (protection S3), when
Short circuit current is I1.maxWhen, it protects S2 and protects between the operation time limit of S3 and the operation time limit of first protective device when should have
Between differential Δ t, i.e.,
And then according to anti-time limit characteristic curvilinear equation, the time coefficient of protection S2 is obtained, i.e.,The anti-time limit characteristic curve of protection S2 can be identified as:
Step 3: similarly, the anti-time limit characteristic curve method and adjusting Step 2 of adjusting protection S3 is almost the same.Protect S3
Anti-time limit characteristic curve i.e. can be identified as:
Step 4: after the amendment voltage amendment by each protection, protection S1, protection S2 and the inverse time-delay operation for protecting S3
Curvilinear equation is as follows:
Wherein, tu1、tu2And tu3Respectively indicate protection S1, protection S2 and the actuation time for protecting S3；Is1、Is2And Is3Respectively
It indicates through protection S1, protection S2 and the electric current for protecting S3；Ipu.1、Ipu.2And Ipu.3Respectively indicate protection S1, protection S2 and protection
The starting current of S3；A1、A2And A3Respectively indicate protection S1, protection S2 and the time coefficient for protecting S3；WithRespectively
Indicate protection S1, protection S2 and this ground voltage for protecting S3, value be measurement voltage after breaking down at each protection with
The ratio of system normal voltage.
It protects the starting time difference between S1 and protection S2, S3 that should meet default selective time difference Δ t, that is, meets as follows
Relationship:
Example IV
On the basis of any embodiment into embodiment three of embodiment one, domain information of standing further include: power network topology system
The measurement voltage of middle high voltage side of transformer.
Then step 120 includes:
When inverse time-lag protection does not have selectivity, the ratio of the on high-tension side measurement voltage and operating voltage of calculating transformer
Value, the ratio are the amendment voltage of high voltage side of transformer.
Then step 130 includes:
Anti-time limit characteristic curvilinear equation is corrected by the amendment voltage and Remedy percent of high voltage side of transformer, obtains first
Correct anti-time limit characteristic curvilinear equation, the first amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, tbiThe second corrective action time of i-th of protective device after line fault generation is represented, P represents compensation
Percentage, P initial value are 1,The amendment voltage of high voltage side of transformer is represented, i represents the number of protective device, AiRepresent i-th
The corresponding time coefficient of a protective device, IsiThe line current for passing through i-th of protective device after line fault generation is represented,
Ipu.iThe protection starting current of i-th of protective device after line fault occurs is represented, n represents proportion index.
To avoid causing due to power network topology system the inverse time-lag protection of the amendment voltage through each protective device from losing choosing
Selecting property compensates anti-time limit characteristic curve using the amendment voltage of high voltage side of transformer.Its value is high-voltage side bus electricity
The ratio of pressure and system normal voltage.It first passes through war domain information and judges whether traditional inverse time current protection loses selectivity.If
Judgement loses selectivity, then carries out high voltage side of transformer voltage compensation.
Protection S1, power network topology system as shown in Figure 3 is protected when losing quick-action by station domain information judgement protection
The voltage of the first bus 2 (bus A) can be used in the actuation time of shield S2 and protection S3To be modified.After amendment, protect
Protect S1, protection S2 and protection S3 actuation time following relationship:
Wherein,For the on high-tension side amendment voltage of transformer 5 at bus A, value is the measurement voltage and system of bus A
The ratio of normal voltage；tb1、tb2And tb3Route respectively in the horizontal direction close to the second bus 3 (bus B) outlet or go out
Protection S1, protection S2 and the actuation time for protecting S3 when short trouble occur for mouth proximal end.
Embodiment five
On the basis of example IV, as shown in figure 4, step 140 includes:
Step 141 corrects anti-time limit characteristic curvilinear equation according to first, stands domain information and default selective time difference, sentences
Whether disconnected inverse time-lag protection has selectivity.
Step 142, if so, the first default adjustment interval that Remedy percent is successively successively decreased since 1, until difference is equal to
The default selectivity time difference completes the optimization of inverse time-lag protection to reach quick-action optimization.
Step 4.3, if it is not, by Remedy percent since 1 the second default adjustment interval incremented by successively, until difference is equal to
The default selectivity time difference completes the optimization of inverse time-lag protection to reach selective requirement.
Required if being unsatisfactory for the default selective time difference after amendment, i.e. inverse-time overcurrent protection there are still selective problems,
The Remedy percent P of voltage is corrected from 1 search upwards, removes distance line abort situation most until searching in power network topology system
The operating time of protection of other each protective devices other than close protective device and the nearest protection of distance line abort situation
The difference of the operating time of protection of device is greater than or equal to the default selective time difference；If meeting selectivity after amendment to require, repair
The Remedy percent P of positive voltage is from 1 search downwards, until searching in power network topology system except distance line abort situation is nearest
Protective device other than other each protective devices operating time of protection and the nearest protection of distance line abort situation fill
The difference for the operating time of protection set is equal to the default selective time difference, to reach quick-action optimization.It is corrected when based on voltage
Inverse-time overcurrent protection when being compensated using the amendment voltage of high voltage side of transformer, certain compensation effect can be reached, but
The still available bigger promotion of compensation effect, therefore Remedy percent is dynamically adapted meeting inverse-time overcurrent protection
Reach quick-action optimization under the premise of selectivity.
Close to the outlet of bus B or outlet proximal end short circuit event occurs for power network topology system as shown in Figure 3 in horizontal alignment
When barrier (distance protection S1 is nearest at this time), the amendment voltage of high voltage side of transformerIt can determine tb1≠ 0, tb2≠ 0, tb3
≠0.Meet the requirement of native selectable according to traditional inverse-time overcurrent protection, available:
But whether can satisfy protective seletion require or it is uncertain, it is possible to by the amendment of high voltage side of transformer
After voltage optimization, it is still unsatisfactory for selective requirement, it is also possible to the protection starting time of protection S2 occur and protect the guarantor of S1
Shield starting time difference is far longer than the default selective time difference, and the protection starting time for protecting S3 and the protection for protecting S1
Starting time difference is far longer than the default selective time difference, and the quick-action of protection is caused to be deteriorated.It should be noted that electric current from
Bus B flows to third bus 4 (bus C).
Step 3) corrects voltage by introducing dynamic adjustment, makes inverse-time overcurrent protection under the premise of meeting selectivity
Reach quick-action optimization.
To the power transmission network of electric system, generator, transformer, transmission line of electricity parameter be all satisfied X > > R, for above-mentioned
Power grid topology model schematic diagram only considers the influence of reactance.Using the amendment voltage based on station domain information: U*=PI*X, wherein P
For the Remedy percent for correcting voltage；X is the equivalent reactance of transformer；I*To pass through the electric current per unit value of transformer.
When short trouble occurs in power grid, inverse-time overcurrent protection S1, protection S2 and guarantor are calculated by domain information of standing
The movement cooperation time between shield S3 is unsatisfactory for selective requirement, using the amendment voltage U based on station domain information*Voltage is carried out to repair
Just.It protects S1, protection S2 and protects the movement cooperation time of S3 as follows:
Step 4), after completing step 2), if being unsatisfactory for selective requirement after amendment, i.e., inverse-time overcurrent protection there are still
Selective problems are corrected the Remedy percent P of voltage from 1 search upwards, are required until searching protection and meeting selectivity just
Cooperation time Δ t when it is corresponding amendment voltage Remedy percent P；If meeting selectivity after amendment to require, i.e. inverse time lag mistake
Stream protection has met selective requirement, corrects the Remedy percent P of voltage from 1 search downwards, until it is just full to search protection
The Remedy percent P of corresponding amendment voltage when the cooperation time Δ t that foot selectively requires, to reach quick-action optimization.
Embodiment six
A kind of optimization system 200 of inverse time-lag protection, as shown in Figure 5, comprising:
First judgment module, for sentencing according to station domain information, inverse time-lag protection curvilinear equation and default selective time difference
Whether inverse time-lag protection has selectivity in power network topology system where disconnected Location.
First computing module, for according to station domain information, calculating power network topology when inverse time-lag protection does not have selectivity
The amendment voltage of high voltage side of transformer in system.
First correction module, for the amendment voltage and Remedy percent amendment anti-time limit characteristic by high voltage side of transformer
Curvilinear equation obtains the first amendment anti-time limit characteristic curvilinear equation.
Optimization module, for correcting anti-time limit characteristic curvilinear equation according to first, standing domain information and default selective time
Difference, adjusts Remedy percent, and optimization inverse time-lag protection makes it have selectivity and quick-action.
Embodiment seven
On the basis of embodiment six, domain information of standing includes: that Location occurs to open up when line fault by power grid
Flutter the line current of each protective device in system, line fault occur after each protective device protection starting current, route
The operating voltage of failure measurement voltage at each protective device both ends and line fault generation preceding power network topology system when occurring.
Embodiment eight
On the basis of embodiment six or embodiment seven, first judgment module is specifically used for: according to station domain information, counting respectively
The ratio of the measurement voltage and operating voltage at each protective device both ends is calculated, which is this ground voltage of each protective device.
It corrects its corresponding anti-time limit characteristic curvilinear equation respectively by this ground voltage, obtains based on modified second amendment of this ground voltage
Anti-time limit characteristic curvilinear equation.According to the second amendment anti-time limit characteristic curvilinear equation, stand domain information and default selective time difference,
Judge whether inverse time-lag protection has selectivity, if so, the optimization of inverse time-lag protection is completed, if it is not, sending out to the first computing module
Send computations.
Wherein, the second amendment anti-time limit characteristic curvilinear equation are as follows:
Inverse time-lag protection curvilinear equation are as follows:
In above-mentioned formula, i represents the number of protective device, AiRepresent the corresponding time coefficient of i-th of protective device, IsiGeneration
Table passes through the line current of i-th of protective device, I after line fault generationpu.iRepresent i-th of protection after line fault occurs
The protection starting current of device, n represent proportion index,Represent this ground voltage of i-th of protective device, tuiIt represents in route
First corrective action time of i-th of protective device after failure occurs, t represent i-th of protective device after line fault generation
Actuation time.
Embodiment nine
On the basis of any embodiment into embodiment eight of embodiment six, domain information of standing further include: power network topology system
The measurement voltage of middle high voltage side of transformer.
Then the first computing module is specifically used for: when inverse time-lag protection does not have selectivity, calculating transformer is on high-tension side
The ratio of voltage and operating voltage is measured, which is the amendment voltage of high voltage side of transformer.
Then the first correction module is specifically used for: by the amendment voltage of high voltage side of transformer and compensation percentage respectively with the inverse time lag
Characteristic curve equation is multiplied, and obtains the first amendment anti-time limit characteristic curvilinear equation, the first amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, tbiThe second corrective action time of i-th of protective device after line fault generation is represented, P represents compensation
Percentage, P initial value are 1,Represent the amendment voltage of high voltage side of transformer.
Embodiment ten
On the basis of embodiment nine, optimization module is specifically used for: according to the first amendment anti-time limit characteristic curvilinear equation, standing
Domain information and default selective time difference, judge whether inverse time-lag protection has selectivity；If so, Remedy percent is opened from 1
Beginning successively successively decreases the first default adjustment interval, until difference is equal to the default selective time difference, it is complete to reach quick-action optimization
At the optimization of inverse time-lag protection；If it is not, by Remedy percent, the incremented by successively second default adjust is spaced since 1, until difference
The optimization of inverse time-lag protection is completed equal to the default selective time difference to reach selective requirement.
In the power system, inverse time current protection is widely used in generator, transformer, motor and transmission line of electricity
In protection.The actuation time of inverse time-lag protection reduces with the increase of line current, this is more suitable for the fault characteristic of load, can be more
The failure for cutting off protected circuit head end fastly overcomes the shortcomings that definiting time-lag overcurrent protection, and inverse-time overcurrent protection device group
At simple, price is low.There is scholar to propose to be modified inverse time-lag protection actuation time using voltage, the inverse time lag can be shortened
Operating time of protection optimizes protective value.However, when electric system major network all configures the current protection of anti-time limit characteristic, it is right
In certain topological structure of electric, limitation is will be present in the cooperation based on voltage amendment inverse time over-current protection.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of optimization method of inverse time-lag protection characterized by comprising
Step 1, according to station domain information, anti-time limit characteristic curvilinear equation and default selective time difference, judge Location
Whether inverse time-lag protection has selectivity in the power network topology system at place；
Step 2, when the inverse time-lag protection do not have selectivity when, according to the station domain information, calculate the power network topology system
The amendment voltage of high voltage side of transformer in system；
Step 3 corrects the anti-time limit characteristic curve side by the amendment voltage and Remedy percent of the high voltage side of transformer
Journey obtains the first amendment anti-time limit characteristic curvilinear equation；
Step 4 corrects anti-time limit characteristic curvilinear equation, the station domain information and the default selective time according to described first
Difference adjusts the Remedy percent, optimizes the inverse time-lag protection and makes it have selectivity and quick-action.
2. a kind of optimization method of inverse time-lag protection according to claim 1, which is characterized in that the station domain information packet
It includes: by the line electricity of each protective device in the power network topology system when Location generation line fault
It is described each when the protection starting current of each protective device, the line fault occur after stream, the line fault occur
The operating voltage of the power network topology system before the measurement voltage at a protective device both ends and the line fault occur.
3. a kind of optimization method of inverse time-lag protection according to claim 2, which is characterized in that the step 1 includes:
Step 1.1, according to the station domain information, calculate separately each protective device both ends measurement voltage and the work
The ratio of voltage, the ratio are this ground voltage of each protective device；
Step 1.2 corrects its corresponding anti-time limit characteristic curvilinear equation by described ground voltage respectively, obtains based on local electricity
Press modified second amendment anti-time limit characteristic curvilinear equation；
Step 1.3, according to the second amendment anti-time limit characteristic curvilinear equation, the station domain information and it is described default selective when
Between it is poor, judge whether the inverse time-lag protection has selectivity, if so, complete inverse time-lag protection optimization, if it is not, execute described in
Step 2,
Wherein, the second amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, i represents the number of the protective device, AiRepresent the corresponding time coefficient of i-th of protective device, IsiIt represents in institute
State the line current after line fault occurs by i-th of protective device, Ipu.iRepresent institute after the line fault occurs
The protection starting current of i-th of protective device is stated, n represents proportion index,Represent this ground voltage of i-th of protective device, tui
Represent the first corrective action time of i-th of protective device after line fault generation.
4. a kind of optimization method of inverse time-lag protection according to claim 2 or 3, which is characterized in that the station domain information
Further include: the measurement voltage of high voltage side of transformer in the power network topology system；
Then the step 2 includes:
When the inverse time-lag protection does not have selectivity, the measurement voltage and work electricity of the high voltage side of transformer are calculated
The ratio of pressure, the ratio are the amendment voltage of the high voltage side of transformer；
Then the step 3 includes:
The anti-time limit characteristic curvilinear equation is corrected by the amendment voltage and Remedy percent of the high voltage side of transformer, is obtained
First amendment anti-time limit characteristic curvilinear equation, the first amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, tbiRepresent the line fault generation after i-th of protective device the second corrective action time, P represent described in
Remedy percent, the P initial value are 1,Represent the amendment voltage of the high voltage side of transformer.
5. a kind of optimization method of inverse time-lag protection according to claim 4, which is characterized in that the step 4 includes:
Step 4.1, according to the first amendment anti-time limit characteristic curvilinear equation, the station domain information and it is described default selective when
Between it is poor, judge whether the inverse time-lag protection has selectivity；
Step 4.2, if so, the first default adjustment interval that the Remedy percent is successively successively decreased since 1, until the power grid
The actuation time of each protective device in topological system in addition to the nearest protective device of distance line abort situation and recently
The difference of actuation time of protective device be equal to the default selective time difference, to reach quick-action optimization, complete anti-
The optimization of time limit protection；
Step 4.3, if it is not, by the Remedy percent since 1 the second default adjustment interval incremented by successively, until the difference
The optimization of inverse time-lag protection is completed equal to the default selective time difference to reach selective requirement.
6. a kind of optimization system of inverse time-lag protection characterized by comprising
First judgment module, for judging line according to station domain information, inverse time-lag protection curvilinear equation and default selective time difference
Whether inverse time-lag protection has selectivity in power network topology system where the abort situation of road；
First computing module, for when the inverse time-lag protection does not have selectivity, according to the station domain information, described in calculating
The amendment voltage of high voltage side of transformer in power network topology system；
First correction module, for correcting the inverse time lag by the amendment voltage and Remedy percent of the high voltage side of transformer
Characteristic curve equation obtains the first amendment anti-time limit characteristic curvilinear equation；
Optimization module, for according to the first amendment anti-time limit characteristic curvilinear equation, the station domain information and the default choosing
The selecting property time difference adjusts the Remedy percent, optimizes the inverse time-lag protection and makes it have selectivity and quick-action.
7. a kind of optimization system of inverse time-lag protection according to claim 6, which is characterized in that the station domain information packet
It includes: by the line electricity of each protective device in the power network topology system when Location generation line fault
It is described each when the protection starting current of each protective device, the line fault occur after stream, the line fault occur
The operating voltage of the power network topology system before the measurement voltage at a protective device both ends and the line fault occur.
8. a kind of optimization system of inverse time-lag protection according to claim 7, which is characterized in that the first judgment module
It is specifically used for:
According to the station domain information, the ratio of the measurement voltage and the operating voltage at each protective device both ends is calculated separately
Value, the ratio are this ground voltage of each protective device；Its corresponding inverse time lag is corrected respectively by described ground voltage
Characteristic curve equation is obtained based on the modified second amendment anti-time limit characteristic curvilinear equation of this ground voltage；It is repaired according to described second
Positive anti-time limit characteristic curvilinear equation, the station domain information and the default selective time difference, judge that the inverse time-lag protection is
It is no that there is selectivity, if so, the optimization of inverse time-lag protection is completed, if it is not, computations are sent to first computing module,
In, the second amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, i represents the number of the protective device, AiRepresent the corresponding time coefficient of i-th of protective device, IsiIt represents in institute
State the line current after line fault occurs by i-th of protective device, Ipu.iRepresent institute after the line fault occurs
The protection starting current of i-th of protective device is stated, n represents proportion index,Represent this ground voltage of i-th of protective device, tui
Represent the first corrective action time of i-th of protective device after line fault generation.
9. a kind of optimization system of inverse time-lag protection according to claim 7 or 8, which is characterized in that the station domain information
Further include: the measurement voltage of high voltage side of transformer in the power network topology system；
Then first computing module is specifically used for:
When the inverse time-lag protection does not have selectivity, the measurement voltage and work electricity of the high voltage side of transformer are calculated
The ratio of pressure, the ratio are the amendment voltage of the high voltage side of transformer；
Then first correction module is specifically used for:
The anti-time limit characteristic curvilinear equation is corrected by the amendment voltage and Remedy percent of the high voltage side of transformer, is obtained
First amendment anti-time limit characteristic curvilinear equation, the first amendment anti-time limit characteristic curvilinear equation are as follows:
Wherein, tbiRepresent the line fault generation after i-th of protective device the second corrective action time, P represent described in
Remedy percent, the P initial value are 1,Represent the amendment voltage of the high voltage side of transformer.
10. a kind of optimization system of inverse time-lag protection according to claim 9, which is characterized in that the optimization module tool
Body is used for:
According to the first amendment anti-time limit characteristic curvilinear equation, the station domain information and the default selective time difference, sentence
Whether the inverse time-lag protection of breaking has selectivity；If so, the first default tune that the Remedy percent is successively successively decreased since 1
Whole interval, until each protection dress in the power network topology system in addition to the nearest protective device of distance line abort situation
The difference of the actuation time of the actuation time and nearest protective device set are equal to the default selective time difference, to reach speed
Dynamic property optimizes, and completes the optimization of inverse time-lag protection；If it is not, the Remedy percent incremented by successively second is preset since 1
Adjustment interval, until the difference is equal to the default selective time difference and completes the inverse time lag to reach selective requirement and protect
The optimization of shield.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710940535.0A CN107528287B (en) | 2017-09-30 | 2017-09-30 | A kind of optimization method and system of inverse time-lag protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710940535.0A CN107528287B (en) | 2017-09-30 | 2017-09-30 | A kind of optimization method and system of inverse time-lag protection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107528287A CN107528287A (en) | 2017-12-29 |
| CN107528287B true CN107528287B (en) | 2018-12-28 |
Family
ID=60685088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710940535.0A Expired - Fee Related CN107528287B (en) | 2017-09-30 | 2017-09-30 | A kind of optimization method and system of inverse time-lag protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107528287B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111049111A (en) * | 2019-12-10 | 2020-04-21 | 国网河南省电力公司洛阳供电公司 | Sectional type fault protection criterion method for active distribution line |
| CN113725829B (en) * | 2021-07-22 | 2022-06-28 | 西安交通大学 | Power distribution network backup protection method and system with automatic matching relationship |
| CN114640093B (en) * | 2022-02-23 | 2023-03-24 | 北京天能继保电力科技有限公司 | Method and device for protecting broken line of distributed power transmission and distribution line |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1614841A (en) * | 2004-11-26 | 2005-05-11 | 北京云电英纳超导电缆有限公司 | Method for protecting superconductive cable |
| CN104577957A (en) * | 2015-01-26 | 2015-04-29 | 国家电网公司 | Inverse time limit overcurrent protection method based on FPGA |
| CN105048409A (en) * | 2015-09-02 | 2015-11-11 | 国网上海市电力公司 | Automatic verification method based on relay protection constant value |
| CN105552837A (en) * | 2016-01-20 | 2016-05-04 | 华北电力大学 | Differential protection method for partition inverse-time transformer by considering DC bias effects |
| CN106655118A (en) * | 2016-11-09 | 2017-05-10 | 山东大学 | Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines |
| CN106711968A (en) * | 2016-12-29 | 2017-05-24 | 中国电力科学研究院 | Inverse-time-lag zero-sequence current protection setting method and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ560346A (en) * | 2005-06-24 | 2010-07-30 | Schweitzer Engineering Lab Inc | Dynamically configurable relay element and related methods |
-
2017
- 2017-09-30 CN CN201710940535.0A patent/CN107528287B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1614841A (en) * | 2004-11-26 | 2005-05-11 | 北京云电英纳超导电缆有限公司 | Method for protecting superconductive cable |
| CN104577957A (en) * | 2015-01-26 | 2015-04-29 | 国家电网公司 | Inverse time limit overcurrent protection method based on FPGA |
| CN105048409A (en) * | 2015-09-02 | 2015-11-11 | 国网上海市电力公司 | Automatic verification method based on relay protection constant value |
| CN105552837A (en) * | 2016-01-20 | 2016-05-04 | 华北电力大学 | Differential protection method for partition inverse-time transformer by considering DC bias effects |
| CN106655118A (en) * | 2016-11-09 | 2017-05-10 | 山东大学 | Acceleration method for zero sequence inverse time limit overcurrent protection of adjacent lines in one-tower two-circuit lines |
| CN106711968A (en) * | 2016-12-29 | 2017-05-24 | 中国电力科学研究院 | Inverse-time-lag zero-sequence current protection setting method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107528287A (en) | 2017-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106908693B (en) | Single-phase grounding route selection method of arc suppression coil grounding system with high accuracy | |
| CN102545174B (en) | Distance back-up protection setting method of ultrahigh voltage circuit | |
| CN107528287B (en) | A kind of optimization method and system of inverse time-lag protection | |
| CN105375532A (en) | Fault phase selection method for double-fed wind power plant tie line | |
| CN105762777B (en) | A kind of longitudinal protection method that inverse distributed power power distribution network is connect containing more T | |
| Baran et al. | Impact of high penetration residential PV systems on distribution systems | |
| CN105067951B (en) | T link single-phase ground fault distance measuring methods based on many time section informations | |
| CN107565504A (en) | A kind of switch protection allocation list and look-up method suitable for 10kV distribution lines | |
| CN107179482B (en) | Extra high voltage direct current transmission line fault recognition method based on current characteristic amount | |
| CN109581148B (en) | Fault phase selection method for new energy electric field tie line | |
| CN106998061B (en) | A kind of protection three-level configuration of 10 KV line of single supply and fixed value adjusting method | |
| CN105186468A (en) | Power distribution network direction over-current protection online setting method and system for access of distributed power supply | |
| CN102856891B (en) | Self-adapting zero sequence current protection method of feeder line | |
| CN106786419B (en) | Wind power plant based on station domain protection philosophy collects system relay protection method | |
| CN110350470A (en) | A kind of distribution network failure recognition methods based on smart grid Dispatching Control System | |
| CN105356430A (en) | Active closed loop power distribution network protection system and method | |
| CN105004944B (en) | A kind of power supply reliability computational methods assessed for power distribution network relay protection | |
| CN106684835A (en) | Online control system and method used for power distribution network relay protection | |
| CN107645155B (en) | Distribution network line distance protecting method after large-scale distributed photo-voltaic power supply access | |
| CN105207180A (en) | Method utilizing reactors connected in series for achieving all-line current quick break protection of distributing lines | |
| CN103887771A (en) | Method for identifying fault branches on basis of zero and negative sequence integrated current | |
| CN206848403U (en) | A kind of four machine Parallel test loops | |
| CN103094888B (en) | Matching method of complex distribution network over-current protection timing sequence based on novel directional element | |
| CN104052033B (en) | A kind of guard method based on zero-sequence current correlation coefficient identification fault branch | |
| CN107742878B (en) | A kind of inverse time lag zero-sequence protection method |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181228 Termination date: 20190930 |