CN107887879A - A kind of relay protection constant value on-line check system - Google Patents
A kind of relay protection constant value on-line check system Download PDFInfo
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- CN107887879A CN107887879A CN201711050244.0A CN201711050244A CN107887879A CN 107887879 A CN107887879 A CN 107887879A CN 201711050244 A CN201711050244 A CN 201711050244A CN 107887879 A CN107887879 A CN 107887879A
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
Abstract
The invention provides a kind of relay protection constant value on-line check system; including the EMS network systems positioned at the nucleus correcting system logic bottom, the online check positioned at the nucleus correcting system logic middle level and early warning system and the visualization human-computer interaction interface positioned at the nucleus correcting system logic top layer, the EMS network systems transmit grid graph, electric network model and power network real-time status to the online check and early warning system.The relay protection provided in the present invention customizes online nucleus correcting system and the performance for protecting definite value is checked online according to power network real time operation mode; provide analysis result; warning message is provided to the protection definite value that hidden danger be present; learn that whole electric network protection performance of relay setting provides technological means for protection staff; the real-time status for being supplied to dispatcher to protect simultaneously, realize that correct power scheduling and system operation mode are formulated and provide technical support for it.
Description
Technical field
The present invention relates to computer realm, more particularly to a kind of relay protection constant value on-line check system.
Background technology
The fast development of power network and the large-scale grid connection of generation of electricity by new energy, it is desirable to improve electric grid relay protection specialty and control greatly
The ability of power network.As interdepending between each regional power grid is dominated with degree of coupling more and more higher, power network characteristic by region
Turn to global schema.Traditional relay protection uses the mode of operation of " adjusting in advance, real-time action, periodic check ", but power train
System is a parameter state in itself all in continually changing dynamical system, in particular with the increasingly sophisticated of electric network composition, new energy
The large-scale grid connection that source generates electricity, this pattern are increasingly difficult to meet the demand for development of power system.What foreign countries repeatedly had a power failure on a large scale
The problem of accident exposes, and the abundant evidence of the above.
Build unified strong intelligent grid, it is desirable to improve the intelligent level of dispatching of power netwoks.Intelligent grid is the world today
The newest direction that power system development is changed, it is great scientific and technical innovation and the development trend of power system.Dispatching of power netwoks is strong
The important component of intelligent grid, its intelligent level are the horizontal important bodies with application level of strong intelligent power grid technology
It is existing.
However, at present still without for online check and early warning of the real-time grid information to protection definite value.Therefore, it is satisfaction
The demand of the construction of intelligent grid and intelligent scheduling, improve relay protection personnel, power scheduling personnel, method of operation personnel to after
The control ability of electric protection action behavior, it is proposed that the requirement of relay protection constant value on-line check and early warning system construction.
In scheduling system at home, typically using trend, sensitivity, static security analysis these function calculatings correlation
Index is scheduled early warning and decision-making, does not carry out systematization judgement from protective value.Therefore, it is necessary to according to this case, it is right
Relay protection constant value on-line check carries out in-depth research work.
The content of the invention
In order to solve the above problems, the present invention provides a kind of relay protection constant value on-line check system.
The present invention is realized with following technical scheme：
A kind of relay protection constant value on-line check system, including the EMS power networks system positioned at the nucleus correcting system logic bottom
System, the online check positioned at the nucleus correcting system logic middle level and early warning system and positioned at the nucleus correcting system logic top layer
Human-computer interaction interface is visualized, the EMS network systems transmit grid graph, power network mould to the online check and early warning system
Type and power network real-time status.
Further, the online check and early warning system include；
Positioned at the data buffering layer of the online check and early warning system bottom, positioned at the online check and early warning system
The basal layer in middle level and online checked and the application layer of early warning system top layer positioned at described.
Further, the application layer be used to carrying out fault current calculating, it is online check, the analysis of research state, accident analysis,
Equipment energy characteristic is analyzed and/or maintenance management.
Further, online check includes：
Real-time mode is checked；
Start definite value to check, the startup definite value, which is checked, includes current start value, voltage starting value or other initiation value；
Main protection definite value is checked, sensitivity of the check content that the main protection definite value is checked including bus differential protection definite value,
The sensitivity of longitudinal differential protection system definite value and the sensitivity of transformer differential protection definite value；
Back-up protection definite value is checked, and the check content that the back-up protection definite value is checked includes：
The sensitivity and selectivity of distance protection, check the influence that ground distance protection considers zero-utility theory.
Distance III section definite values load-bearing capacity of hiding is checked online；
Failure protection electric current and the sensitivity for pressing off lock value again；
The sensitivity and selectivity of zero-sequence current protection；
The sensitivity and selectivity of transformer overcurrent protection.
Further, the research state is used for the adaptation disposition using online data or historical data analysis protection definite value
Condition, specifically for being modified to the various operational factors of power network, then protect the suitable of definite value after further analytical parameters change
Ying Xing, the research state analysis include：CASE fractograph analysis and artificial anticipation mode are analyzed.
Further, the accident analysis is applied to the calculation of fault of each voltage class, and can be examined in calculating process
Consider trend, and calculate, check no resistance element breaker, the electrical quantity of bus, the compensation calculation method of code requirement, branch
Arbitrarily complicated calculation of fault is held, the power network scale of calculation of fault is unrestricted, and supports the input of arc light resistance.
Further, described device specificity analysis includes differential specificity analysis and distance III sections and hided load capacity analysis.
Further, the maintenance management includes user authority management, CASE management, plant stand docking, equipment interconnection, parameter
Compare, principle is set, definite value is shown, verification mode is set and equipment point is set.
Further, additionally it is possible to carry out statistical analysis, the content of the statistical analysis includes starting customization qualification rate, main guarantor
Protect qualification rate and back-up protection qualification rate.
Further, the displaying content of the visualization human-computer interaction interface include check result, research state analysis result,
Failure analysis result and differential specificity analysis result.
The beneficial effects of the invention are as follows：
The relay protection provided in the present invention customizes online nucleus correcting system according to power network real time operation mode to protecting definite value
Performance checked online, provide analysis result, warning message provided to the protection definite value that hidden danger be present, obtained for protection staff
Know whole electric network protection performance of relay setting and technological means is provided, while the real-time status for being supplied to dispatcher to protect, for its realization
Correct power scheduling and system operation mode, which are formulated, provides technical support.
Brief description of the drawings
Fig. 1 is a kind of relay protection constant value on-line check system block diagram provided in an embodiment of the present invention；
Fig. 2 is application-level logic block diagram provided in an embodiment of the present invention；
Fig. 3 is the hardware topology framework logic diagram of system provided in an embodiment of the present invention；
Fig. 4 is Distributed Computing Platform logic diagram provided in an embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing
It is described in detail on step ground.
A kind of relay protection constant value on-line check system, as shown in figure 1, including positioned at the nucleus correcting system logic bottom
EMS network systems, the online check positioned at the nucleus correcting system logic middle level and early warning system and positioned at the nucleus correcting system
The visualization human-computer interaction interface of logic top layer, the EMS network systems transmit power network to the online check and early warning system
Figure, electric network model and power network real-time status.
Specifically, the online check and early warning system include；
Positioned at the data buffering layer of the online check and early warning system bottom, positioned at the online check and early warning system
The basal layer in middle level and online checked and the application layer of early warning system top layer positioned at described.The application layer is used to carry out failure
Current calculation, online check, the analysis of research state, accident analysis, equipment energy characteristic analysis and/or maintenance management.
Wherein, fault current calculating is the basis of relay protection constant value on-line check, for simulating, studying various failure bars
The behavior of power system under part, check sensitivity, the selectivity of protection definite value.It is online to check fault current calculating aspect mainly
Realize it is claimed below including：
(1) to the requirement of fault current computational methods
It may be selected to consider influence on tidal flow or do not consider the short-circuit current calculation method of influence on tidal flow.
(2) to the requirement of fault type
Fault current, which calculates, supports single-line to ground fault, two-phase grounding fault, two-phase phase fault, three-phase shortcircuit, broken string
The simple faults such as failure；For various short troubles, should possess the ability that transition resistance is set；Trouble point may be disposed on circuit
Optional position, bus, Transformer Winding outlet, generator outlet.
(3) to the requirement of calculation of fault disposal ability
Various special electric network compositions, such as small impedance branches, mother and block switch, isolated area can be handled；It can locate
Manage the mutual inductance of multiple zero sequence all fronts, partial mutual inductance branch road；The mode that any element can be handled changes, as circuit puts into operation, stops transport, transformation
It is device neutral-point solid ground, earth-free and through impedance earth etc.；The calculation scale of the treatable system of fault current computing module
Eng is enough to be determined according to actual conditions, and can conveniently be adjusted.
Further, as shown in Fig. 2 online check includes：
Real-time mode is checked；
Start definite value to check, the startup definite value, which is checked, includes current start value, voltage starting value or other initiation value；
Main protection definite value is checked, sensitivity of the check content that the main protection definite value is checked including bus differential protection definite value,
The sensitivity of longitudinal differential protection system definite value and the sensitivity of transformer differential protection definite value；
Back-up protection definite value is checked, and the check content that the back-up protection definite value is checked includes：
The sensitivity and selectivity of distance protection, check the influence that ground distance protection considers zero-utility theory.
Distance III section definite values load-bearing capacity of hiding is checked online；
Failure protection electric current and the sensitivity for pressing off lock value again；
The sensitivity and selectivity of zero-sequence current protection；
The sensitivity and selectivity of transformer overcurrent protection.
The research state is used for the adaptation implementations using online data or historical data analysis protection definite value, is specifically used for
The various operational factors of power network are modified, the adaptability of definite value is then protected after further analytical parameters change, it is described to grind
Studying carefully state analysis includes：CASE fractograph analysis and artificial anticipation mode are analyzed.
The accident analysis is applied to the calculation of fault of each voltage class, and it can be considered that trend in calculating process, and
And calculate, check no resistance element breaker, the electrical quantity of bus, the compensation calculation method of code requirement, support any multiple
Miscellaneous calculation of fault, the power network scale of calculation of fault is unrestricted, and supports the input of arc light resistance.
Described device specificity analysis includes differential specificity analysis and distance III sections and hided load capacity analysis.
The maintenance management includes user authority management, CASE management, plant stand docking, equipment interconnection, parameter comparison, principle
Set, definite value is shown, verification mode is set and equipment point is set.
Further, additionally it is possible to carry out statistical analysis, the content of the statistical analysis includes starting customization qualification rate, main guarantor
Protect qualification rate and back-up protection qualification rate.
Further, the displaying content of the visualization human-computer interaction interface include check result, research state analysis result,
Failure analysis result and differential specificity analysis result.
In order to realize above-mentioned function, the hardware topology framework of the system as shown in figure 3, including：
It is online to check main (standby) server：Relay protection constant value on-line check and the main program of early warning system are arranged, and is made
For history data file storage server.
Online calculation and check server：Relay protection constant value on-line check and the calculation procedure of early warning system are arranged, as
Cycle calculation and check server.
Work station：Relay protection constant value on-line check and early warning system program are arranged, realizes man-machine interaction.
Specifically, during the system operation, various computing functions are managed automatically by Distributed Computing Platform, as shown in figure 4,
It illustrates Distributed Computing Platform Organization Chart.If relay protection constant value on-line check and early warning system Distributed Computing Platform by
" computer cluster " and the corresponding software composition that dry computer (node) is connected by LAN.Scheduling and association by management node
Conditioning function, platform can efficiently and rapidly complete the high-volume of user's submission in line computation service." computer cluster " node is to concentrate
Cluster nodes, calculate node plug and play, add, exit flexibly, make full use of the computing capabilitys of all computers in system,
Meet that constant value on-line check calculates demand.
In order to lift online check speed, the embodiment of the present invention carries out following improvement relative to conventional method：
According to research object, can be formed with research on utilization object region, segmentation branch road, border bus, new interconnection
Depression of order mini Mod reflect whole network.Zoning A current best value is such as wanted, region A networks can be simplified with it
Equivalent network is simulated.Due to calculation and check model selection nodal impedance matrix, if large-scale interconnected power system includes k region electricity
Net, each regional power grid include n node, then the summation of each regional power grid sequence net impedance matrix storage size is kn2, if not
Consider the boundary node number repeated in each region, then the nodes of interconnected network are kn, so as to its sequence net impedance matrix
Storage size be k2*n2, it is clear that regional power grid is more, in the way of regional power grid tissue data its impedance matrix store
Superiority in terms of scale is bigger.Due to divide into small network, the whole network is so both really reflected, ensure that the correct of calculating
Property, the scale of research model is greatly reduced again, greatly improves arithmetic speed.
Further, in order to consider N-1, N-2 application in online check, cause in calculating process to nodal impedance matrix
Need repeatedly to correct, the system is intended using optimized algorithm to improve speed.Have mutually according to maintenance branch road and with maintenance branch road first
The node number of the branch road of sense, difference augmentation positive sequence, the calculative node number of zero sequence form set A.The node to be calculated is hindered
When element is modified in anti-matrix, in addition to the m times amendment of last time, amendment needs to calculate every time for preceding m-1 amendment
Element be all element in set A, and the calculating to element in set A is all that the result once corrected in the past is counted every time
Calculate, last the m time correct when, then only need calculating object corresponding to interdependent node be modified, avoid computation model the whole network
The amendment of node elements, it is far smaller than computation model the whole network node elements due to calculating object interdependent node element, so as to significantly
Improve speed.
In order to further improve arithmetic speed, when checking first time, consider by the whole network model；And when checking next time,
Compare the difference of this mode and last mode.Determine computer capacity rule：On off state and first time in this remote signalling amount
The protection periphery N level plant stands changed；The guarantor of load current definite value and first time result difference more than 20% in this remote measurement amount
Protect N levels periphery plant stand.Meanwhile the refreshing of the whole network check result is carried out by the cycle, as January carries out the check of the whole network model.
Further, the embodiment of the present invention provides adaptive online calculation and check model：
Business is checked according to different definite values, online check or the anticipation mode of definite value are carried out using different computation models
Analysis.
Online check model based on real-time mode：Once topology is derived from EMS system to power network, is docked using plant stand, equipment
Docking mode and adaptive setting software interface, the primary equipment parameter of adaptive setting software (Zero sequence parameter, mutual inductance parameter, is become
Depressor neutral point state etc.), secondary device information (protection definite value, equipment energy characteristic, CT/PT no-load voltage ratio information etc.) access calculate mould
Type；Real-Time Switch state, Real-time Power Flow access computation model are obtained from EMS system, generates the online check of power network real-time mode
Model.
Further, the embodiment of the present invention provides checks distance protection based on measurement impedance method：
Check method based on fixed value calculation, it is impossible to the experience impedance of correct reflection device, therefore, for distance protection,
Using measurement impedance method.
Measurement impedance is defined as protecting installation place measurement voltage with measuring the ratio between electric current：
Alternate measurement impedance：
Earthmeter impedance：WhereinK：Zero-utility theory
Zero sequence current compensation factor K calculating (circle characteristic and quadrilateral characteristics) mode is as follows when having mutual inductance：Zero-sequence mutual inductance
Coupling circuit has an impact to ground distance protection so that the zero-utility theory of ground distance protection is in not with mutual inductance circuit
It is different with the position of trouble point under operating mode and change.As shown in table 1.
The zero-utility theory table of table 1
Note：It is mainly reactive component in view of zero sequence mutual impedance, it is believed that
From the point of view of the requirement of the selectivity of relay protection, being whenever not intended to protection domain elongation, to cause protection to bypass the immediate leadership dynamic
Make, so zero sequence current compensation factor is typically pressed
Value, such K (Kx) take small, are advantageous to protect not malfunction in external short circuit, but sensitive during internal short-circuit
Degree can decline, and this is allowed in engineering.
Selection for penalty coefficient, selected according to Project Unit operating experience, if pressedTo select
Select, checking in principle, coefficient correlation need to be modified.
Relay protection constant value on-line check system passes through relay protection constant value on-line check and early warning in the embodiment of the present invention
The rational design of systemic-function, realize relay protection constant value on-line check, research state check, accident analysis, III of Distance section are hided
The functions such as load capacity analysis, differential specificity analysis.Provided for personnel such as power scheduling, operation, relay protections advanced, practical, high
The electric grid relay protection constant value analysis means of effect, and then improve the production efficiency of power system, improve the stability of power system.
The effect of relay protection constant value on-line check and early warning system is summarized as follows：
(1) electric network model is selected, computational methods select, checks content, exhibition scheme etc. from power network actual conditions, is had
Effect utilizes various resources；
(2) it can in time find to protect hidden danger existing for definite value, skill is provided for the control of power networks risk, transfer, neutralizing
Art is supported, effectively avoids accident；
(3) accuracy of the cooperation of power network first and second is greatly improved, increases the reliability of operation of power networks.
Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (10)
- A kind of 1. relay protection constant value on-line check system, it is characterised in that：Including the EMS network systems positioned at the nucleus correcting system logic bottom, positioned at the online of the nucleus correcting system logic middle level Check and early warning system and the visualization human-computer interaction interface positioned at the nucleus correcting system logic top layer, the EMS power networks system Unite to the online check and early warning system transmission grid graph, electric network model and power network real-time status.
- A kind of 2. relay protection constant value on-line check system according to claim 1, it is characterised in that the online check And early warning system includes；Positioned at the data buffering layer of the online check and early warning system bottom, positioned at the online check and early warning system middle level Basal layer and online checked and the application layer of early warning system top layer positioned at described.
- A kind of 3. relay protection constant value on-line check system according to claim 2, it is characterised in that：The application layer is used In progress fault current calculating, online check, the analysis of research state, accident analysis, equipment energy characteristic analysis and/or maintenance management.
- A kind of 4. relay protection constant value on-line check system according to claim 3, it is characterised in that the online check Including：Real-time mode is checked；Start definite value to check, the startup definite value, which is checked, includes current start value, voltage starting value or other initiation value；Main protection definite value is checked, and the check content that the main protection definite value is checked includes the sensitivity of bus differential protection definite value, circuit The sensitivity of pilot protection definite value and the sensitivity of transformer differential protection definite value；Back-up protection definite value is checked, and the check content that the back-up protection definite value is checked includes：The sensitivity and selectivity of distance protection, check the influence that ground distance protection considers zero-utility theory；Distance III section definite values load-bearing capacity of hiding is checked online；Failure protection electric current and the sensitivity for pressing off lock value again；The sensitivity and selectivity of zero-sequence current protection；The sensitivity and selectivity of transformer overcurrent protection.
- 5. a kind of relay protection constant value on-line check system according to claim 3, it is characterised in that the research state is used In the adaptation implementations using online data or historical data analysis protection definite value, specifically for the various operational factors to power network Modify, the adaptability of definite value is then protected after further analytical parameters change, the research state analysis includes：CASE sections Analysis and artificial anticipation mode are analyzed.
- A kind of 6. relay protection constant value on-line check system according to claim 3, it is characterised in that the accident analysis Suitable for the calculation of fault of each voltage class, and it can be considered that trend in calculating process, and calculate, check no resistance element The electrical quantity of breaker, bus, the compensation calculation method of code requirement, supports arbitrarily complicated calculation of fault, calculation of fault Power network scale it is unrestricted, and support the input of arc light resistance.
- A kind of 7. relay protection constant value on-line check system according to claim 3, it is characterised in that it is characterized in that： Described device specificity analysis includes differential specificity analysis and distance III sections and hided load capacity analysis.
- A kind of 8. relay protection constant value on-line check system according to claim 3, it is characterised in that the maintenance management Including user authority management, CASE management, plant stand docking, equipment interconnection, parameter comparison, principle setting, definite value displaying, check side Formula is set and equipment point is set.
- 9. a kind of relay protection constant value on-line check system according to claim 1, it is characterised in that can also be united Meter analysis, the content of the statistical analysis include starting customization qualification rate, main protection qualification rate and back-up protection qualification rate.
- A kind of 10. relay protection constant value on-line check system according to claim 1, it is characterised in that the visualization The displaying content of human-computer interaction interface includes check result, research state analysis result, failure analysis result and differential characteristic point Analyse result.
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