CN105139081B - A kind of distribution system contact point planing method of high reliability - Google Patents
A kind of distribution system contact point planing method of high reliability Download PDFInfo
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Abstract
The present invention relates to a kind of distribution system contact point planing methods of high reliability, its main feature is that including multi-joint network distribution system reliability evaluation method and establishing contact point plan model and carrying out method for solving to it, the multi-joint network distribution system reliability evaluation method is realized using the Minimal Cut Set of piecemeal Calculation of Reliability, described to establish contact point plan model and solve to it.The present invention carries out fail-safe analysis to multi-joint network distribution system using the Minimal Cut Set of piecemeal Calculation of Reliability, it is constraint with system power supply reliability index, contact point plan model is established so that economy is optimal for target, and it is solved using genetic algorithm, it ensure that system under the premise of there is higher power supply reliability, economy preferably and obtains preferable rate of return on investment, has stronger guidance value.
Description
Technical field
The invention belongs to power supply and distribution technical fields, and in particular to a kind of distribution system contact point planning side of high reliability
Method.
Background technique
Contact is the important component of distribution system, has important meaning with service restoration for the load transfer after failure
Justice is the important means for improving distribution Power System Reliability.Current Distribution Automation Construction focuses mostly on transformation to be set in switch
Standby or distribution power automation terminal equipment etc. carries out installation or automatic improving, however after failure quickly isolates, if existing standby
It is out-of-limit with parameters generations such as voltages after power supply off-capacity or load transfer, it can still result in associated loadings and be removed and lose for a long time
Electricity.Therefore new contact must be built in respective feed connection section, transfer and the power supply to guarantee destructive malfunction generation afterload are extensive
It is multiple.
Currently, many researchs have been carried out for the contact point planning of distribution system.Correlative study proposes middle press-fitting
Interconnecting ties optimization algorithm, under the premise of meeting substation and transformer horizontal N-1 criterion, calculating keeps unloaded interconnection solid
Surely the smallest contact scheme is invested.Part work sutdy interconnection switch is distributed rationally, and contact is opened inside research same feeder line
What is closed distributes rationally, premised on improving system reliability principle, seeks that the system losses for obtaining network reconfiguration are the smallest to match
Set scheme.Structural optimization problems are got in touch between separately having scholar to have studied main transformer station from distribution system net capability angle.
If in distribution system each feeder line section construction get in touch with can be achieved high reliability, but in view of interconnection switch equipment at
This is higher, and the selection of interconnector is related to complicated geography information factor, and unchecked construction contact will lead to great amount of investment.Therefore,
Should according to actual demands such as the payloads, user type, the mode of connection of different power supply areas, comprehensively consider power supply reliability,
It gets in touch with the factors such as construction investment and planning of science activities is carried out to the quantity of contact point, installation location, to centainly power in guarantee system
Under the premise of reliability, investment is minimum, obtains higher rate of return on investment.
Has correlative study for the contact planning problem of distribution system.The prior art is mainly from the list simplified between feeder line
Contact planning, the optimization interconnection of two-tie connection mode, the selection of interannular interconnection drop point site, the optimization of interconnection switch are matched
It sets, the number of the power distribution network block switch and interconnection switch distributing rationally, consider reliability of same feeder line inside interconnection switch
The planning of amount and riding position gets in touch with the power distribution network containing photo-voltaic power supply based on load-photovoltaic equivalent load curve dynamic segmentation
Switch optimizes configuration, considers that loss of outage and equipment investment have studied the optimization allocation of interconnection switch with fuzzy membership
Optimal segmentation and contact calculation method and automatic section switch and automatic under function representation load importance, complex topology structure
The combination and configuration method of interconnection switch, above-mentioned technical proposal carry out contact planning to distribution system from different perspectives, exist
Certain limitation, it is difficult to which the reasonability for promoting Electric Power Network Planning optimization can not meet increasingly developed power reguirements.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of designs rationally, has return more with high investment
The distribution system contact point planing method of rate and the high reliability of guidance value.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of distribution system contact point planing method of high reliability, including multi-joint network distribution system reliability evaluation method
And establish contact point plan model and method for solving is carried out to it,
The multi-joint network distribution system reliability evaluation method realizes have using the Minimal Cut Set of piecemeal Calculation of Reliability
Body the following steps are included:
Step 1 is distributed progress feeder line piecemeal according to switch；
Step 2, the type to each piecemeal, load, reliability information count；
Step 3, be directed to each load block, search for the block to power module, shift block all minimal paths and it is all and
Other connected paths of the block；
Step 4, the single order power supply cut set that the load block is found out according to minimal path information, single order transfer cut set block；
Step 5, the single order cut set information according to the minimal path in step 3 and in step 4, what analysis was connected with load block
The influence that each feeder line block breaks down to the load block, and add up；
Step 6 repeats step 3 to step 5, until all load block analysis are finished；
Step 7, the reliability index for calculating each load point and system；
The method established contact point plan model and it is solved the following steps are included:
Step 1, each load section determine decision variable:
Step 2 builds the minimum target of the sum of O&M year investment IC with system year loss of outage ECOST, contact, with system
Availability ASAI power as constraint, establishes contact point plan model；
Step 3 solves contact point plan model using binary strings genetic algorithm.
Moreover, it is described to the type of each piecemeal, load, reliability information carry out statistics be according to series element reliability meter
Calculate the failure rate λ that formula calculates each pieceBWith System average interruption duration rB, calculation formula is as follows:
In formula: NBFor element number, λ in blockiWith riThe failure rate of respectively i-th element and repair time.
Moreover, it is described analyze each feeder line block for being connected with load block and break down the influence to the load block and carry out tired
The method added are as follows: the relationship of preferential analysis trouble block and single order power supply cut set, and analyze influence of the failure to supply path；If therefore
Barrier can not be isolated, then the relationship of trouble block and single order transfer cut set is analyzed, to determine influence of the failure to transfer path；To one
For specific load block, coupled feeder line block can be divided into following four seed type:
1. the single order of the block and load block is powered, there are breaker or fuses between cut set, then the block failure is to load block
It does not have an impact；
2. the single order of the block and load block is powered without breaker between cut set, but there are block switches, then the block failure meeting
Load block is caused to have a power failure, interruption duration is the Fault Isolation time；
3. the single order of the block and load block is powered without any switch between cut set, but exists between single order transfer cut set and divide
Duan Kaiguan, then the block failure can cause load block to have a power failure, and interruption duration is the sum of Fault Isolation time and transfer time；
It shifts with single order and is opened between cut set without any without any switch between cut set 4. the single order of the block and load block is powered
It closes, then the block failure can cause load block to have a power failure, and interruption duration is the mean repair time of trouble block.
Moreover, the contact point plan model is to invest in system year loss of outage desired value ECOST, contact construction O&M year
The minimum target of the sum of IC is shown below using system power supply availability desired value ASAI as constraint
min:ECOST+IC
s.t.:ASAI≥K
(1) system year loss of outage desired value ECOST calculation formula are as follows:
In formula: NL is load number of nodes, ALjFor the average load of load point j, ENSjTo have a power failure in the year of j-th of load bus
Electricity expectation, IEARjHave a power failure corresponding every kWh power failure energy cost every time for j-th of load bus；
(2) contact construction O&M investment IC calculation formula is as follows:
IC=NtieAtie(1+h)/2
Wherein NtieFor contact point Quantity, AtieYear value is built for every contact, h is that equipment O&M expense takes equipment to throw
The ratio of rate takes the half of every contact construction investment desired value divided by 2 expression contact point construction investments, existing according to equipment
The formula that value calculates equipment year value is as follows:
Wherein, PtieFor the present worth of single contact construction, i is discount rate；
(3) system year loss of outage desired value ASAI calculation formula are as follows:
Moreover, described solve contact point plan model using binary strings genetic algorithm, comprising the following steps:
Step (1) initializes network parameter and algorithm parameter；
Initialization group is randomly generated in step (2)；
Step (3) calculates fitness；
Step (4) optimal result saves；
Step (5) judges whether to meet stop criterion, if conditions are not met, then selecting cross and variation, and return
Step (3) exports result if meeting stop criterion.
The advantages and positive effects of the present invention are:
The present invention carries out fail-safe analysis to multi-joint network distribution system using the Minimal Cut Set of piecemeal Calculation of Reliability, with
System power supply reliability index is constraint, establishes contact point plan model so that economy is optimal for target, and calculate using heredity
Method is solved, and ensure that system under the premise of having higher power supply reliability, economy is preferably and acquisition is preferably invested back
Report rate has stronger guidance value.
Detailed description of the invention
Fig. 1 is Calculation of Reliability process；
Fig. 2 is genetic algorithm calculation process；
Fig. 3 is 6 part distribution system main wiring diagram of RBTS bus；
Fig. 4 is loss of outage and contact point Quantity with ASAI constraint variation diagram.
Specific embodiment
The embodiment of the present invention is further described below in conjunction with attached drawing:
A kind of distribution system contact point planing method of high reliability, including following two parts method: (1) multi-joint network distribution
Systems reliability analysis method, (2) are established contact point plan model and are solved to it.
One, multi-joint network distribution system reliability evaluation method
Multi-joint network distribution system reliability evaluation method is the Minimal Cut Set using piecemeal Calculation of Reliability to multi-joint network
Distribution system carries out fail-safe analysis.This method inherits reliability block algorithm, and (being detailed in document, (Xie Yinghua, Wang Chengshan are based on
Reliability Evaluation of Middle Voltage Distribution Networks [J] Proceedings of the CSEE of Feeder partitioning, 2004,24 (5): 35-39；(Zhou Nian
At Xie Kaigui, Zhou Jiaqi wait Complex Distribution System Reliability Assessment block algorithm [J] the electric system of based on shortest path automatic
Change, 2006,29 (22): 39-44.) advantage, while comparing both the above method, Minimal Cut Set supplies radial, multiterminal
The distribution system of electric and multi-joint network wiring all has good adaptability.As shown in Figure 1, the minimal cut set of piecemeal Calculation of Reliability
Method the following steps are included:
1, it is distributed according to switch and carries out feeder line piecemeal
Feeder line block refers to the internal feed element set for being free of any switch, and the element in block can be node, one
Route, is also possible to the combination of multiple nodes and route.Block wherein containing power supply node is defined as power module, section containing transfer
The block of point is defined as transfer block, and the block containing load bus is defined as load block.
2, the information such as the type of each piecemeal, load, reliability are counted
Statistics is connected to load type in block on all nodes, size data, prepares for Calculation of Reliability.Due to feedback
Without switch in line block, thus the failure of any element will all cause entire feeder line block to be removed in block.It is reliable according to series element
Property calculation formula calculates each piece of failure rate λBWith System average interruption duration rB, calculation formula is as follows:
In formula: NBFor element number, λ in blockiWith riThe failure rate of respectively i-th element and repair time.In analysis only
Consider the persistent failure of element.
3, it is directed to each load block, searches for the block to power module, all minimal paths and all and block of transfer block
Other connected paths.Pass through the search in three of the above path, it may be determined that all simultaneously energy that are connected with load block in network structure
It is enough to cause the switch on the block and phase access path of potential impact to be distributed load block.
4, cut set block is shifted according to single order power supply cut set, the single order that minimal path information finds out the load block
The minimal path matrix to power module and transfer block is established according to the search result of minimal path.The every row of the matrix corresponds to
Power module or a minimal path for shifting block, each column correspond to a feeder line block in network.If comprising a certain in certain minimal path
A feeder line block, then the element that feeder line block column is corresponded in row corresponding with the minimal path is 1, otherwise the element is zero.If most
Column element corresponding to certain feeder line block is 1 in path matrix, then the block is single order cut set block.
5, the single order cut set information according to the minimal path in step 3 and in step 4, analysis are connected each with load block
The influence that feeder line block breaks down to the load block, and add up.
The relationship of preferential analysis trouble block and single order power supply cut set, and analyze influence of the failure to supply path；If failure
It can not be isolated, then the relationship of trouble block and single order transfer cut set be analyzed, to determine influence of the failure to transfer path.Have to one
For the load block of body, coupled feeder line block can be divided into following four seed type:
1. the single order of the block and load block is powered, there are breaker or fuses between cut set, then the block failure is to load block
It does not have an impact.
2. the single order of the block and load block is powered without breaker between cut set, but there are block switches, then the block failure meeting
Load block is caused to have a power failure, interruption duration is the Fault Isolation time.
3. the single order of the block and load block is powered without any switch between cut set, but exists between single order transfer cut set and divide
Duan Kaiguan, then the block failure can cause load block to have a power failure, and interruption duration is the sum of Fault Isolation time and transfer time.
It shifts with single order and is opened between cut set without any without any switch between cut set 4. the single order of the block and load block is powered
It closes, then the block failure can cause load block to have a power failure, and interruption duration is the mean repair time of trouble block.
6, step 3~5 are repeated, until all load block analysis are finished.
7, the reliability index of each load point and system is calculated.Wherein, the reliability index of each load point is equal to it
The reliability index of place block.
Service restoration analysis: the above method is that Calculation of Reliability is carried out under TLOC criterion, does not count and get in touch with off-capacity
Limitation.The rough calculation method under PLOC criterion is set forth below, to consider the limitation of contact off-capacity.
When preceding method step 3 forms all transfer paths, for the j-th strip transfer path of load block i, add up this turn
Move the load P on pathtrans-ij, and the capacity C with the transfer contact pointtie-ijIt makes comparisons, and records comparison result RijIf
Ptrans-ij< Ctie-ij, then Rij=true, otherwise Rij=false.
For load block i, transfer path j if it exists, so that Rij=true, then the load block is transferable, is denoted as Ti=
true；Otherwise, load is not transferable.Preceding method step 5 3. in, if Ti=true, transfer time are constant；If Ti=
False, transfer time are revised as failure mean repair time.
Two, it establishes contact point plan model and it is solved
Establish contact point plan model the following steps are included:
1, decision variable is determined:
Whether model builds contact point for 01 decision variable, such as following formula institute with each load section (feeder line section of on-load)
Show:
2, contact point plan model is established:
This model is with the sum of system year loss of outage ECOST, contact construction O&M year investment IC minimum target, with system
Availability ASAI power as constraint, is shown below:
(1) loss of outage ECOST
System year loss of outage desired value ECOST calculation formula are as follows:
In formula: NL is load number of nodes, ALjFor the average load of load point j, ENSjTo have a power failure in the year of j-th of load bus
Electricity expectation, IEARjHave a power failure corresponding every kWh power failure energy cost every time for j-th of load bus.
(2) contact construction O&M invests IC
Contact construction O&M investment IC calculation formula is as follows:
IC=NtieAtie(1+h)/2 (6)
Wherein NtieFor contact point Quantity, AtieYear value is built for every contact, h is that equipment O&M expense takes equipment to throw
The ratio of rate takes the half of every contact construction investment desired value divided by 2 expression contact point construction investments.
Formula according to equipment present value computation equipment year value is as follows:
Wherein, PtieFor the present worth of single contact construction, i is discount rate.
(3) power availability ASAI
System year loss of outage desired value ASAI calculation formula are as follows:
Above-mentioned contact point plan model is solved using binary strings genetic algorithm, specific process flow is as shown in Figure 2.
The following steps are included:
1, network parameter and algorithm parameter are initialized；
2, initialization group is randomly generated；
3, fitness is calculated；
4, optimal result saves；
5, judge whether to meet stop criterion, if conditions are not met, cross and variation is then selected, and return step 3, if met
Stop criterion then exports result.
6 part distribution system example part feeder line of RBTS bus shown in Fig. 3 is tested below, which is middle pressure
Distribution system has 18 load points, and 1755 users, all loads are multiplied by 5, and to simulate feeder line case of heavy load, overall average is negative
Lotus is 6.081MW.The switching time of interconnection switch takes 0.05h, and the switch time of non-automatic switch takes 1h；All kinds of unit demand electricity
It is as shown in table 1 to measure power failure cost data.Single contact construction cost present worth takes 100000 yuan, and the service life takes 20 years, equipment discount rate
0.1 is taken, O&M expense accounts for equipment investment cost ratio and takes 0.03.
1 unit quantity of electricity power failure cost of table
Table 2 and table 3 give the reliability index on contact configuration boundary, wherein think that interconnection tie spare capacity is enough,
The afterload that breaks down can shift completely.By table as it can be seen that construction contact point can extension system Reliability Bound, further increase
System power supply reliability.
The reliability index 1 (switch is not transformed, and load can shift completely) on the contact configuration of table 2 boundary
The reliability index 2 (switch transform automatic switch as, and load can shift completely) on the contact configuration of table 3 boundary
Contact point capacity is set forth in table 4 and table 5 when being 1MVA and 3MVA, under different power supply availability ASAI constraints
Contact point optimum programming scheme, including contact point construction optimal number, position and loss of outage expectation, contact construction O&M
Investment and total cost.ECOST corresponding with table 4 and the change curve that contact point Quantity is constrained with ASAI are as shown in Figure 4.It is right
In feeder line F1, F2, when contact point capacity is 1MVA, contact the ratio between capacity and section load mean value are slightly larger than 1, and each contact point is only capable of
Load restoration power supply to load section where access point, i.e. contact point capacity are only capable of one load section of covering；Contact point capacity is
When 3MVA, contact the ratio between capacity and section load mean value are greater than 3, and each contact point can nearby about 3 load sections be born to access point
Lotus restores electricity, i.e., contact point can cover its about 3 load section nearby.For feeder line F3, capacity and each section of load value are got in touch with
The ratio between be consistently less than 1, i.e. contact point cannot cover any load section.
By table 4 and table 5 as it can be seen that the contact point of required construction is more, this is because each community center when contact capacity is smaller
The load section that can be shifted is less, often plus builds a contact point, ASAI index increase rate is limited, it is necessary to build more contact point
Power loss load could more be restored, improve reliability index；And contact point capacity it is larger when, often plus build a contact point,
ASAI index obtains larger raising, thus the contact point of required construction is less, and economy is more excellent.In addition, program results are shown,
Feeder line F3 does not build contact, this is because the contact point F3 cannot cover any one load section, cannot restore if building contact point
The power supply of any one load section, can not reduce loss of outage, increase construction investment instead, not meet the optimal mesh of economy
Mark, therefore contact point capacity must be at least more than the load of a load section.
4 contact point program results 1 of table
(contact capacity 1MVA, ASAImin=99.9901%, ASAImax=99.9912%, get in touch with capacity and section duty ratio
Value F1-1.0442, F2-1.1024, F3-0.2185)
5 contact point program results 2 of table
(contact capacity 3MVA, ASAImin=99.9901%, ASAImax=99.9925%, get in touch with capacity and section duty ratio
Value F1-3.1326, F2-3.3071, F3-0.6555)
By testing 6 example part feeder line of RBTS BUS, and contact point capacity is analyzed to the shadow of program results
It rings, test result shows the validity of proposed model and method, has stronger guidance value.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore packet of the present invention
Include and be not limited to embodiment described in specific embodiment, it is all by those skilled in the art according to the technique and scheme of the present invention
The other embodiments obtained, also belong to the scope of protection of the invention.
Claims (2)
1. a kind of distribution system contact point planing method of high reliability, it is characterised in that including multi-joint network distribution Power System Reliability
It analysis method and establishes contact point plan model and method for solving is carried out to it,
The multi-joint network distribution system reliability evaluation method is realized using the Minimal Cut Set of piecemeal Calculation of Reliability, specific to wrap
Include following steps:
Step 1 is distributed progress feeder line piecemeal according to switch；
Step 2, the type to each piecemeal, load, reliability information count, method particularly includes:
Each piece of failure rate λ is calculated according to series element Calculation of Reliability formulaBWith System average interruption duration rB, calculate public
Formula is as follows:
In formula: NBFor element number, λ in blockiWith riThe failure rate of respectively i-th element and repair time；
Step 3 is directed to each load block, searches for the block to power module, all minimal paths and all and block of transfer block
Other connected paths；
Step 4, the single order power supply cut set that the load block is found out according to minimal path information, single order transfer cut set block；
Step 5, the single order cut set information according to the minimal path in step 3 and in step 4, analysis are connected each with load block
The influence that feeder line block breaks down to the load block, and add up；Method particularly includes:
The relationship of preferential analysis trouble block and single order power supply cut set, and analyze influence of the failure to supply path；If failure can not
Isolation analyzes the relationship of trouble block and single order transfer cut set, then to determine influence of the failure to transfer path；It is specific to one
For load block, coupled feeder line block can be divided into following four seed type:
1. the single order of the block and load block is powered, there are breaker or fuses between cut set, then the block failure does not produce load block
It is raw to influence；
2. the single order of the block and load block is powered without breaker between cut set, but there are block switches, then the block failure can cause
Load block has a power failure, and interruption duration is the Fault Isolation time；
3. the single order of the block and load block is powered without any switch between cut set, but there is segmentation between single order transfer cut set and open
It closes, then the block failure can cause load block to have a power failure, and interruption duration is the sum of Fault Isolation time and transfer time；
4. the single order of the block and load block is powered without any switch between cut set, without any switch between single order transfer cut set,
Then the block failure can cause load block to have a power failure, and interruption duration is the mean repair time of trouble block；
Step 6 repeats step 3 to step 5, until all load block analysis are finished；
Step 7, the reliability index for calculating each load point and system；
The method established contact point plan model and it is solved the following steps are included:
Step 1, each load section determine decision variable:
Step 2 builds the minimum target of the sum of O&M year investment IC with system year loss of outage ECOST, contact, with system power supply
Availability ASAI establishes contact point plan model as constraint；
Step 3 solves contact point plan model using binary strings genetic algorithm.
2. a kind of distribution system contact point planing method of high reliability according to claim 1, it is characterised in that: described
Contact point plan model is solved using binary strings genetic algorithm, comprising the following steps:
Step (1) initializes network parameter and algorithm parameter；
Initialization group is randomly generated in step (2)；
Step (3) calculates fitness；
Step (4) optimal result saves；
Step (5) judges whether to meet stop criterion, if conditions are not met, cross and variation is then selected, and return step (3), if
Meet stop criterion, then exports result.
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| CN112803412B (en) * | 2021-04-12 | 2021-07-02 | 广东电网有限责任公司佛山供电局 | Distribution network contact point type identification method and system |
| CN115329513B (en) * | 2022-07-11 | 2024-02-13 | 国网江苏省电力有限公司徐州供电分公司 | Reliability index design method and system based on power distribution planning |
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