CN109858662A - A kind of differential evolution method of fault current limiter Optimizing in bulk power grid - Google Patents
A kind of differential evolution method of fault current limiter Optimizing in bulk power grid Download PDFInfo
- Publication number
- CN109858662A CN109858662A CN201811186782.7A CN201811186782A CN109858662A CN 109858662 A CN109858662 A CN 109858662A CN 201811186782 A CN201811186782 A CN 201811186782A CN 109858662 A CN109858662 A CN 109858662A
- Authority
- CN
- China
- Prior art keywords
- current
- current limiter
- fault current
- short circuit
- limiter
- 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.)
- Pending
Links
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A kind of differential evolution method of the invention discloses fault current limiters in bulk power grid Optimizing, this method considers power grid dynamic reliability problem under short-circuit conditions, it is analyzed in conjunction with electric network composition, quantitative evaluation is carried out to electric network reliability, establish the quantitative mathematic model between electric network reliability and short circuit current, obtain the initial candidate installation site of fault current limiter, the important pivot main line in route is obtained then in conjunction with the Analysis of Hierarchy Structure of power grid, finally advanced optimized again by objective function application differential evolution algorithm of the equilibrium degree of current limit levels and current limitation effect, using the difference after layouting every time between short circuit current restriction effect as Evolutionary direction, the global optimum for gradually obtaining fault current limiter layouts configuration.The method of the present invention can effective limiting short-circuit current, optimization current limiter layouts configuration, reduces optimization range, raising power grid dynamic reliability.
Description
Technical field
The present invention relates to the extra-high voltage grid fields in electric system, more particularly, to a kind of fault current limiter in bulk power grid
The differential evolution method of middle Optimizing.
Background technique
With the continuous development of China's power grid, power grid scale constantly expands, and gradually forms using extra-high voltage as trunk rack
Electric power networks.Extra-high voltage grid scale is big, long transmission distance, transmit capacity are big, the short circuit electricity of power grid after causing extra-high voltage to access
The quick raising of flow horizontal, influences wide.Therefore, the exceeded safety and stability fortune for directly affecting extra-high voltage grid of short circuit current
Row becomes one of urgent problem in extra-high voltage development.
Problem out-of-limit for extra-high voltage grid short circuit currents at present, it has been suggested that a variety of current limiting measures are broadly divided into two
Kind: a kind of measure limiting grid short circuit electric current is to change system operation mode by adjusting electric network composition, such as: using direct current
Transmission of electricity, power system delamination and subarea, bus section is run and the measures such as electromagnetic looped network unlinks.Wherein, although using HVDC Transmission Technology
Short circuit current problems of too can fundamentally be solved, but this measure is longer the time required to start to be designed into practical application,
And cost is larger.Other measures are relatively easy, convenient for application, but can power supply reliability to system and stability bring it is unfavorable
It influences.The measure of another kind limitation grid short circuit electric current is to install current limiter additional, for example, current-limiting reactor, installs failure current limit additional
Device etc..Wherein, it is approximately 0 that fault current limiter, which can keep impedance when power grid operates normally, and occurs to increase when short circuit
Big impedance limit short circuit current, installation influence smaller and its current limitation effect and are also able to satisfy requirement.
Although can effectively limit the short circuit current in power grid using fault current limiter, the characteristics of its higher cost, is very big
Ground economically limits its installation number.Therefore, with regard to the installation cloth point analysis of current fault current limiter, economy is its cloth
The matter of utmost importance that point considers, and in actual operation of power networks, the problem of reliability is its overriding concern；Secondly, at present
Some is mostly to use all routes for generally considering bulk power grid to the research that fault current limiter installation is layouted, computationally intensive, is had
Blindness.Therefore, how least fault current limiter is installed in bulk power grid using reduction procedure and can guarantee that power grid is reliable
Safe operation becomes the key to solve the problem.
Summary of the invention
For the out-of-limit situation of the busbar short-circuit electric current being likely to occur in domestic electrical system, in conjunction with electric network reliability point
Analysis, as far as possible less and be capable of effectively limiting short-circuit current installation fault current limiter, the purpose of the present invention is to provide one kind
The differential evolution method of fault current limiter Optimizing in bulk power grid, the differential evolution method are able to achieve economy, reliability
And the combination of safety.
The object of the present invention is achieved like this:
A kind of differential evolution method of fault current limiter Optimizing in bulk power grid, is characterized in: specific step is as follows institute
Show:
A, short-circuit electricity is found out in the calculating for carrying out three short circuit current to target network using electric system software (PSASP)
Exceeded node is flowed, and records three short circuit current value；
B, the load loss rate data under the out-of-limit data of short circuit current, initial reliability quantization parameter and failure are collected, into
Row quantization, assesses the reliability under short circuit malfunction, and quantized result is arranged；
C, for statistical analysis to the reliability assessment result in step B, and result is ranked up, due to reliability with
Short circuit current presents negatively correlated, is ranked up from big to small to quantized result as needed, big former of selection quantization end value
The reliability of a node, these nodes is lower, and it is first as the candidate of fault current limiter to find out the route being connected with these nodes
Begin that site is installed；
D, it is initial population by the fault current limiter initial candidate route in step C, initializes sensor distributing, be arranged simultaneously
The installation number of units of fault current limiter, the failure current limit effect after being installed with fault current limiter establishes objective function, in algorithmic procedure
In, using the difference between adjacent sample twice as Evolutionary direction and size, gradually failure is limited using differential evolution points distributing method
The sensor distributing of stream device optimizes, and obtains optimal value, realizes global optimization configuration；
E, optimal sensor distributing obtained in step D is carried out calculating analysis verifying, in conjunction with electric network composition and reliability point
Analysis calculates grid short circuit electric current, and final fault current limiter installation site is determined in the case where meeting current limitation effect.
For in above-mentioned steps D, the Optimized model of fault current limiter are as follows:
(1), current limitation effect evaluation function are as follows:
Wherein, αkFor exceeded weight,αkNode before size and the fault current limiter installation of value
Short circuit current size is related, and before fault current limiter installation, short circuit current level is higher, and the short circuit current weight of this node is got over
Greatly；λkTo install the short circuit current change rate after fault current limiter,λkValue is bigger, indicates the limit of fault current limiter
It is more significant to flow effect.And Ik、I'kShort-circuit current value respectively before and after current limliting；I0To possess the short circuit electricity of the setting under certain allowance
Flow valuve；
(2), meet current limitation effect to avoid the occurrence of, and each website busbar short-circuit current difference after current limliting is away from biggish feelings
The equilibrium degree of condition, the short circuit current limited case after needing to install fault current limiter calculates, evaluation installation failure current limit
Current limliting overall effect equilibrium degree situation after device, the optimal mount scheme of optimization.It is whole after evaluating current limliting therefore, it is necessary to establish
The evaluation function of body effects equalizer degree.
The evaluation function of current limliting overall effect equilibrium degree are as follows:
(3), need to meet three constraint conditions using fault current limiter limiting short-circuit current scheme: busbar short-circuit electric current wants small
In current limliting target；The impedance of fault current limiter need to be higher than the minimum value of effective limiting short-circuit current；The erecting bed of fault current limiter
Number is met the requirements；
(4), while considering that current limitation effect is in specified tolerance, consider the whole limitation water of current limitation effect
It is flat, to simplify Optimized model, here, the reactance of desirable fault current limiter is 10 ohm, multi-goal optimizing function are as follows:
In the distributing rationally of fault current limiter, need to comprehensively consider current limit levels and overall effect.In conjunction with this
Correlation between the two constructs fitness function are as follows:
M in F=-c1f1+c2f2
In formula, c1、c2For weight coefficient, according to the actual situation to c1、c2Value is selected.
The present invention is right using current limitation effect and its equilibrium degree as optimization aim from the out-of-limit situation of grid short circuit electric current
Electric network reliability is analyzed, then in conjunction with the analysis and research to Power grid structure, with short circuit current and fault current limiter
Installation number of units as constraint condition, using evolution algorithm and optimize calculating, the optimization cloth of fault current limiter be done step-by-step
Point is realized with the purpose of least installation number of units limiting short-circuit current to greatest extent, to obtain the peace of optimal fault current limiter
Dress scheme.
That is: the present invention obtains short circuit current parameter, and electric network reliability is combined to quantify by carrying out short circuit calculation to power grid
The data such as the load loss rate under parameter and failure carry out quantitative evaluation to electric network reliability, find out in reliability quantized result
The low location point of reliability, as the possibility installation site point of fault current limiter, and candidate point less in the out-of-limit situation of electric current compared with
In the case where few, the installation situation of fault current limiter is relatively simple, can directly adopt enumerative technique and be tested.And in power grid
Out-of-limit bus website increases, the installation of fault current limiter layout it is relative complex, enumerative technique no longer be applicable in, therefore, in reliability
On the basis of candidate point is selected in assessment, configuration is optimized to fault current limiter using evolution algorithm.
Therefore, the present invention have can effectively limiting short-circuit current, optimization current limiter layout configuration, reduce optimization range, mention
The reliable advantage of high power grid dynamic is a kind of Optimal Configuration Method of the fault current limiter for gradually selecting, evolving in power grid.
Detailed description of the invention
Fig. 1 is that the evolution of fault current limiter is layouted flow diagram；
Fig. 2 is the flow diagram of differential evolution algorithm；
Fig. 3 is the schematic diagram of IEEE39 node system.
Specific embodiment:
Below with reference to embodiment and compares attached drawing invention is further described in detail.
The present invention mainly uses following technical scheme to realize, it is shown that its step are as follows:
(1), reliability assessment quantitative model is established, related electric amount parameter: three short circuit current value, load loss is collected
Rate and reliability quantization inceptive value；
(2), fault current limiter alternative initial installation site is filtered out according to reliability quantized result, simplifies optimization process；
(3), the candidate installation site in initialization step (2), is arranged the installation number of units of fault current limiter, using difference into
Change algorithm to optimize the sensor distributing of fault current limiter, gradually evolve and obtain optimal solution, realizes global optimization configuration；
(4), the characteristics of fully considering electric network reliability and grid structure calculates the mount scheme of fault current limiter
Verifying；
Optimization is layouted as an embodiment of the present invention with the fault current limiter of IEEE39 node system below, to this hair
Bright summary of the invention is described further.
(1), system three short circuit current value is calculated, obtains the out-of-limit more serious node of short circuit current, while right
System carries out reliability quantitative evaluation；
(2), the quantized result of reliability assessment is ranked up, obtains the low node of reliability, and find out associated branch
As the candidate branch of fault current limiter, as a result as shown in the table:
1 current limiter of table is layouted candidate branch
(3), site is installed in this, as the initial candidate of fault current limiter, branch is renumberd；
(4), be arranged fault current limiter installation number of units, using differential evolution algorithm to fault current limiter layout carry out it is excellent
Change, Evolutionary direction and size are set, gradually evolves and obtain fault current limiter installation site optimal value；
(5), in conjunction with electric network composition and fail-safe analysis, utilize professional software: electric system software (PSASP) carries out short circuit
Electric current calculates, and verifies the feasibility of current limliting scheme.
Claims (2)
1. a kind of differential evolution method of fault current limiter Optimizing in bulk power grid, it is characterised in that: specific step is as follows
It is shown:
A, the calculating for carrying out three short circuit current to target network using electric system software, finds out the exceeded section of short circuit current
Point, and record three short circuit current value；
B, the load loss rate data under the out-of-limit data of short circuit current, initial reliability quantization parameter and failure, the amount of progress are collected
Change, the reliability under short circuit malfunction is assessed, and quantized result is arranged；
C, for statistical analysis to the reliability assessment result in step B, and result is ranked up, due to reliability and short circuit
Negative correlation is presented in electric current, is ranked up from big to small to quantized result as needed, the big preceding several sections of selection quantization end value
The reliability of point, these nodes is lower, finds out the route being connected with these nodes and pacifies as the alternative initial of fault current limiter
Fill site；
D, it is initial population by the fault current limiter initial candidate route in step C, initializes sensor distributing, while failure is set
The installation number of units of current limiter, the failure current limit effect after being installed with fault current limiter establishes objective function, in algorithmic procedure, with
Difference between adjacent sample twice is Evolutionary direction and size, using differential evolution points distributing method gradually to fault current limiter
Sensor distributing optimizes, and obtains optimal value, realizes global optimization configuration；
E, optimal sensor distributing obtained in step D is carried out calculating analysis verifying, in conjunction with electric network composition and fail-safe analysis, meter
Grid short circuit electric current is calculated, final fault current limiter installation site is determined in the case where meeting current limitation effect.
2. the differential evolution method of fault current limiter according to claim 1 Optimizing in bulk power grid, feature exist
In: in above-mentioned steps D, the Optimized model of fault current limiter are as follows:
(1), current limitation effect evaluation function are as follows:
Wherein, αkFor exceeded weight,αkNode short circuit before size and the fault current limiter installation of value
Size of current is related, and before fault current limiter installation, short circuit current level is higher, and the short circuit current weight of this node is bigger；λk
To install the short circuit current change rate after fault current limiter,λkValue is bigger, indicates the current limliting effect of fault current limiter
Fruit is more significant.And Ik、I'kShort-circuit current value respectively before and after current limliting；I0To possess the setting short circuit current under certain allowance
Value；
(2), meet current limitation effect to avoid the occurrence of, and each website busbar short-circuit current difference after current limliting is needed away from larger situation
The equilibrium degree of short circuit current limited case after installing to fault current limiter calculates, after evaluation installation fault current limiter
Current limliting overall effect equilibrium degree situation, the optimal mount scheme of optimization.Therefore, it is necessary to establish the overall effect after evaluating current limliting
The evaluation function of equilibrium degree.
The evaluation function of current limliting overall effect equilibrium degree are as follows:
(3), need to meet three constraint conditions using fault current limiter limiting short-circuit current scheme: busbar short-circuit electric current is less than limit
Flow target；The impedance of fault current limiter need to be higher than the minimum value of effective limiting short-circuit current；The installation number of units of fault current limiter is full
Foot requires；
(4), while considering that current limitation effect is in specified tolerance, consider the whole limit levels of current limitation effect, be
Simplify Optimized model, here, the reactance of desirable fault current limiter is 10 ohm, multi-goal optimizing function are as follows:
In the distributing rationally of fault current limiter, need to comprehensively consider current limit levels and overall effect.In conjunction with the two
Between correlation, construct fitness function are as follows:
M in F=-c1f1+c2f2
In formula, c1、c2For weight coefficient, according to the actual situation to c1、c2Value is selected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186782.7A CN109858662A (en) | 2018-10-12 | 2018-10-12 | A kind of differential evolution method of fault current limiter Optimizing in bulk power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811186782.7A CN109858662A (en) | 2018-10-12 | 2018-10-12 | A kind of differential evolution method of fault current limiter Optimizing in bulk power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109858662A true CN109858662A (en) | 2019-06-07 |
Family
ID=66889704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811186782.7A Pending CN109858662A (en) | 2018-10-12 | 2018-10-12 | A kind of differential evolution method of fault current limiter Optimizing in bulk power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109858662A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104156531A (en) * | 2014-08-15 | 2014-11-19 | 贵州电力试验研究院 | Fault current limiter distribution point optimization and capacity selection method taking operation loss into consideration |
| CN106296451A (en) * | 2016-08-08 | 2017-01-04 | 国家电网公司 | A kind of fault current limiter Optimizing collocation method based on genetic algorithm |
| CN107423478A (en) * | 2017-05-17 | 2017-12-01 | 云南电网有限责任公司 | A kind of computational methods of supergrid fault current limiter Optimizing |
-
2018
- 2018-10-12 CN CN201811186782.7A patent/CN109858662A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104156531A (en) * | 2014-08-15 | 2014-11-19 | 贵州电力试验研究院 | Fault current limiter distribution point optimization and capacity selection method taking operation loss into consideration |
| CN106296451A (en) * | 2016-08-08 | 2017-01-04 | 国家电网公司 | A kind of fault current limiter Optimizing collocation method based on genetic algorithm |
| CN107423478A (en) * | 2017-05-17 | 2017-12-01 | 云南电网有限责任公司 | A kind of computational methods of supergrid fault current limiter Optimizing |
Non-Patent Citations (1)
| Title |
|---|
| 全国工业机械电气系统标准化技术委员会，国家机床质量监督检验中心编: "《机械电气设备安全标准使用手册：机械电气设备安全标准理解与实施》", 31 August 2004, 中国标准出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107679658B (en) | Power transmission network planning method under high-proportion clean energy access | |
| Rao et al. | Power loss minimization in distribution system using network reconfiguration in the presence of distributed generation | |
| CN110490376B (en) | Intelligent soft switch planning method for improving reliability and economy of power distribution network | |
| Biswas et al. | Optimum distributed generation placement with voltage sag effect minimization | |
| Ganguly et al. | A novel multi-objective PSO for electrical distribution system planning incorporating distributed generation | |
| WO2020237839A1 (en) | Method for power distribution network planning considering reliability constraints | |
| WO2014190759A1 (en) | Svc compensation strategy optimization method | |
| CN109687458A (en) | Consider the space truss project method of regional distribution network risk tolerance difference | |
| CN105207196B (en) | A kind of power grid critical circuits discrimination method based on effective power flow betweenness | |
| CN108462210B (en) | Photovoltaic open capacity calculation method based on data mining | |
| CN108233359B (en) | Partition optimization method and system for extra-high voltage alternating current-direct current feed-in receiving end power grid | |
| CN108400609A (en) | It is adapted to the inhibition multi-infeed HVDC commutation failure site selecting method of phase modifier | |
| Jiang et al. | Identification of voltage stability critical injection region in bulk power systems based on the relative gain of voltage coupling | |
| Dorostkar‐Ghamsari et al. | Optimal distributed static series compensator placement for enhancing power system loadability and reliability | |
| CN103178534B (en) | Calculating method for prevention and control strategy of small interference stabilization | |
| CN105610168A (en) | Application method of node voltage stability index of multi-infeed AC/DC system | |
| CN106483393B (en) | Configuration method and system are unified in harmonic wave and voltage dip monitoring point | |
| CN110414810A (en) | Meter and the multiterminal intelligence Sofe Switch Optimal Configuration Method and system for losing load risk | |
| CN105741016B (en) | Static reliability probability index obtaining method for medium-term power grid planning | |
| CN114896745A (en) | Multi-stage large-scale multi-objective PMU (phasor measurement Unit) optimal configuration method considering single-line fault | |
| CN115528682A (en) | Optimized regulation and control method considering loss characteristics of key equipment of flexible interconnected power distribution network | |
| CN110783913A (en) | Group-based optimal power grid topology online optimization method considering expected accident set | |
| CN109301832B (en) | Section flow optimization control method based on N-1 static safety constraint | |
| CN110768260B (en) | Power grid cascading failure model building method based on electrical betweenness | |
| CN109858662A (en) | A kind of differential evolution method of fault current limiter Optimizing in bulk power grid |
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 | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190607 |
|
| WD01 | Invention patent application deemed withdrawn after publication |