CN102565630A - State labeling method for estimating reliability of distribution network - Google Patents
State labeling method for estimating reliability of distribution network Download PDFInfo
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- CN102565630A CN102565630A CN2012100420494A CN201210042049A CN102565630A CN 102565630 A CN102565630 A CN 102565630A CN 2012100420494 A CN2012100420494 A CN 2012100420494A CN 201210042049 A CN201210042049 A CN 201210042049A CN 102565630 A CN102565630 A CN 102565630A
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Abstract
The invention provides a state labeling method for estimating the reliability of a distribution network. By the method, the switch-on state of an outage switch and the switch-on state of a normally-open switch in the distribution network can be labeled. Compared with the prior art, the invention has the advantages that: fault analysis time of the distribution network which is operated in real time can be shortened; and the outage duration time of each element and each load after faults can be accurately and quickly determined, so that reliability indexes of the distribution network can be accumulated.
Description
Technical field
The present invention relates to the Power System and its Automation field, specifically relate to a kind of status indication method that is used for evaluating reliability of distribution network.
Background technology
The Model in Reliability Evaluation of Power Systems method can be divided into two big types, i.e. analytical approach and analogy method.The network structure of power distribution network is radial, and is different with power transmission network.Therefore, the reliability assessment of power distribution network fault mode commonly used and consequences analysis method (FMEA), this method belongs to analytical approach.Distribution network reliability evaluation method depends on action sequence actual behind the distribution network failure, generally comprises fault and takes place, protection action, fault isolation, network reconfiguration, fault restoration, several steps such as network recovery.Wherein, the configuration of protection is depended in the action of protection; Fault isolation depends on position and the distribution operating personnel of the trouble spot judgement to the trouble spot; Network reconfiguration depends on the optimization aim constraints.
The protection action can be divided into two types, and fuse is preserved scheme and blown fuse scheme.With regard to fuse is preserved scheme, through the proper protection configuration, after fault takes place, disconnect before blown fuse with regard to tripping, to avoid the fusing of fuse.After this disconnect is attempted reclosing, and for the situation of most transient faults, disconnect can successful reclosing, downstream load is supplied power recovering.The benefit of this scheme is to save the cost of changing fuse, and because the reclosing possibility of success, this scheme also can reduce the downstream load power-off time.The blown fuse scheme means then that near the upper reaches blown fuse of trouble spot, this scheme can effectively intercept fault and upstream conduct, but faces higher fuse replacement cost.Blown fuse that transient fault causes and downstream load outage also can't restore electricity through automatic reclosing.The different protection allocation plan has determined the difference of moving after the distribution fault and the difference of corresponding topology.
Reconstruct is to guarantee that distribution network satisfies under the prerequisite of various constraint conditions after the distribution fault, through network reconfiguration outage as much as possible load is transferred to the normal power supply zone, realizes the economy of the network operation after the shortest and reconstruct of reconstructed operation time simultaneously.
When carrying out behind the distribution network failure reconstruct, need to consider following problem:
1) non-fault outage as much as possible district is restored electricity;
2) the switch motion number of times is the least possible, the running time short as far as possible (consider simultaneously hand switch and teleswitch on actuation time different);
3) the distribution network active loss after the reconstruct is minimum;
4) keep distribution network radially;
5) guarantee that busbar voltage and branch current are in allowed band;
6) in the time can not recovering the load power supply of whole non-fault outages district, the power supply of priority restores important load;
7) to lack the computing time of fault recovery algorithm, restrain reliable as much as possible.
Therefore, reconstruct is a multiple goal, multiple constraint, hybrid combining optimization problem after the distribution fault.Generally, can set up knowledge base through off-line analysis, each the bar accident in the promptly corresponding forecast accident collection forms distribution reconstruct prediction scheme, to save the analysis time under the real time execution.
Different protection configuration and automatic reconfiguration configuration affects be the topology after the distribution fault, and then have influence on scope, number of users and the interruption duration of outage.
Summary of the invention
Compared with prior art, the present invention is directed to the prior art deficiency, a kind of status indication method that is used for evaluating reliability of distribution network is provided, said method comprises the steps:
The reliability result of 1-1) initialization distribution network;
1-2) judge whether feeder line section breaks down;
1-3) topological analysis the whole network calculates bus to feeder line section and two ends thereof before the normal open switch closure and puts sign A, upgrades the reliability result;
1-4) after the section breaker isolated fault and before the closed normal open switch, the fault section element is put sign C, the element that has restored electricity is put sign B, upgrade the reliability result;
1-5) topological analysis and power supply nargin are analyzed the whole network, judge closed normal open switch closure after each element whether be powered, the element of power path, the power supply of power supply nargin is put sign D, upgrade the reliability result;
1-6) judge whether i+1 bar feeder line section breaks down, until the fault judgement of accomplishing feeder line section;
1-7) output the whole network, each feeder line section, each element and load group corresponding reliable property index.
Further, said power distribution network comprises TRT, power transmitting device, transformation device, power distribution equipment and power device.
Further, at 1-3) step employing recursive algorithm, comprise the steps:
3-1) put sign A for the fault feeder section i that influenced by disconnection fault before the cut-off switch closure;
3-2) search the feeder line section database, be connected with feeder line section i if find feeder line section j, and feeder line section j no marks A, then get into 3-3);
After traveling through all feeder line section,, then return the last layer recurrence, end mark A if do not find satisfactory feeder line section;
3-3) if the bus impermanence switch that feeder line section i is connected with feeder line section j then gets into 3-4);
Otherwise, if feeder line section i has normal open switch with the bus that feeder line section j is connected, continue to search next bar and the feeder line section that feeder line section i is connected, return 3-2);
If it is disconnected to have traveled through all feeder lines, then return the last layer recurrence, end mark A;
3-4) put sign A for feeder line section j;
After 3-5) sign A is accomplished, get into one deck recurrence down, whether the feeder line section that search is connected with feeder line section j sign A.
Further, at 1-4) step employing recursive algorithm, concrete steps are following:
The feeder line section section that 4-1) can restore electricity after the cut-off switch isolation judges that whether calculate bus i is in fault section, if be in fault section, then returns the last layer recurrence, end mark B;
If be not in fault section, get into 4-2);
4-2) set sign B for calculating bus i;
4-3) judge to calculate whether corresponding normal open switch of bus i, if corresponding normal open switch then returns the last layer recurrence, end mark B;
If not corresponding normal open switch then gets into 4-4);
4-4) search feeder line section database is end points if find feeder line section j to calculate bus i, and feeder line section j do not indicate B and C, then gets into 4-5);
If traversal feeder line section database does not find to meet the feeder line section of above-mentioned condition, then return the last layer recurrence, end mark B;
4-5) put sign B for feeder line section j and corresponding calculating bus thereof, get into one deck recurrence down, whether search indicates B with the feeder line section that calculating bus j is connected.
Further, at 1-4) step flow process employing recursive algorithm, concrete steps are following:
5-1) find the affiliated section x of fault feeder section;
5-2) find all feeder line section that belong to section x, feeder line section and feeder line section two ends calculating bus are put sign C.
A nearlyer step ground is at 1-5) step employing recursive algorithm, concrete steps are following:
6-1) judge that whether calculate bus i is in fault section, if be in fault section, then returns the last layer recurrence, end mark D;
If be not in fault section, get into 6-2);
6-2) set sign D for calculating bus i;
6-3) search feeder line section database is end points if find feeder line section j to calculate bus i, and feeder line section j do not indicate C and D, then gets into 6-4);
If traversal feeder line section database does not find to meet the feeder line section of above-mentioned condition, then return the last layer recurrence, end mark D;
6-4) give feeder line section j, and the corresponding bus that calculates puts sign D, get into one deck recurrence down, whether search indicates D with the feeder line section that calculating bus j is connected.
Again further, said renewal reliability result is the real-time update to data in the power distribution network and device duty.
Compared with prior art, the beneficial effect used of the present invention is: the present invention saves the analysis time that power distribution network breaks down under the real time execution; The interruption duration of each element, load after accurately confirming fast to break down, and then its reliability index that adds up.
Description of drawings
Fig. 1 is the main flow chart of the embodiment of the invention;
Fig. 2 is the sign A schematic flow sheet of the embodiment of the invention;
Fig. 3 is the sign B schematic flow sheet of the embodiment of the invention;
Fig. 4 is the sign D schematic flow sheet of the embodiment of the invention;
Fig. 5 is the feeder line section mark synoptic diagram of the embodiment of the invention;
Fig. 6 is the topological analysis and the status indication methods and results synoptic diagram of the reliability assessment of the embodiment of the invention.
Embodiment
The present invention's " a kind of topological analysis and status indication method that is used for evaluating reliability of distribution network " has considered a series of actions sequential of distribution after the fault; Comprise fault isolation, distribution reconstruct, fault restoration, network topology recovery; Confirm the state of each element, load and it is carried out respective markers in each step; Thereby confirm that the interruption duration of each element of back, load takes place fault; And then its reliability index that adds up, when normal open switch is used for circuit and breaks down, the temporary transient closed pair circuit supply of switch.
Term of the present invention, " section ": one group of feeder line section doing the border with switch.If wherein a feeder line section breaks down, switch motion, whole section will be isolated.
" calculating bus ": the physics bus must be to calculate bus; The node that carries out after switch merges also forms the calculating bus, and promptly the node of switch both sides is merged into a bit, and this point is the calculating bus.
The status indication method that is used for evaluating reliability of distribution network is based on a cover reliability calculation method of FMEA method, and this method is applicable to dissimilar protection configurations, and Fig. 1 is the main flow chart of the embodiment of the invention, and concrete steps are following:
1-1) initialization the whole network and each element corresponding reliable property result;
1-2) the situation of consideration i bar feeder line section fault;
1-3) carry out topological analysis, all elements in the influenced scope before the switch motion are put sign A, and upgrade corresponding reliability result;
1-4) after the switch isolation fault, change supply before, all elements of fault section are put sign C, the element that has restored electricity is put sign B, and corresponding renewal reliability result;
1-5) carry out topological analysis and the analysis of power supply nargin, whether each element of assessment interconnection switch action back can change confession, to the element that has power path (if power supply nargin enough then this element can change confessions) put sign D, renewal reliability result;
1-6) consider next bar feeder line section, until having considered all feeder line section.
1-7) output the whole network and each element corresponding reliable property result.
Of Fig. 2, at 1-2) in the step, need to judge the fault incidence that receives before the switch motion, so that put sign A.
Putting sign A begins from the fault feeder section.This flow process adopts recursive algorithm, and concrete steps are following:
2-1) put sign A for feeder line section i;
2-2) search the feeder line section database, be connected with feeder line section i if find feeder line section j, and feeder line section j no marks A, then get into 2-3); After traveling through all feeder line section,, then return the last layer recurrence if do not find satisfactory feeder line section;
2-3) if the bus impermanence switch that feeder line section i is connected with feeder line section j then gets into 2-4); Otherwise continue to search next bar feeder line section, return 2-2); If it is disconnected to have traveled through all feeder lines, then return the last layer recurrence;
2-4) put sign A for feeder line section j;
2-5) get into one deck recurrence down.
Of Fig. 3, at 1-4) in the step, the element that can restore electricity after needing search switch to isolate is so that put sign B.This flow process adopts recursive algorithm, and concrete steps are following:
3-1) judge that whether calculate bus i is in fault section, if belong to, then returns the last layer recurrence; If do not belong to, get into 3-2);
3-2) set sign B for calculating bus i;
3-3) judge whether correspondence is often driven interconnection switch to calculating bus i, if then return the last layer recurrence; If not, then get into 3-4);
3-4) search feeder line section database is end points if find feeder line section j to calculate bus i, and feeder line section j do not indicate B and do not indicate C, then gets into 3-5); If traversal feeder line section database does not find to meet the feeder line section of above-mentioned condition, then return the last layer recurrence;
3-5) put sign B for feeder line section j, the offside that obtains feeder line section j calculates bus, gets into one deck recurrence down.
At 1-4) in the step, need all elements of search fault section, and put sign C.This flow process adopts recursive algorithm, and is specific as follows:
(1) finds the affiliated section x of fault feeder section.
(2) find all feeder line section that belong to section x, bus is calculated at they and they two ends put sign C.
As shown in Figure 4, at 1-5) in the step, need the action of search interconnection switch after, with the aisled element of power supply, and put sign D.This flow process adopts recursive algorithm, and concrete steps are following:
4-1) judge that whether calculate bus i is in fault section, if belong to, then returns the last layer recurrence; If do not belong to, get into 4-2);
4-2) set sign D for calculating bus i;
4-3) search feeder line section database is end points if find feeder line section j to calculate bus i, and feeder line section j do not indicate C and do not indicate D, then gets into 4-4); If traversal feeder line section database does not find to meet the feeder line section of above-mentioned condition, then return the last layer recurrence;
4-4) put sign D for feeder line section j, the offside that obtains feeder line section j calculates bus, gets into one deck recurrence down.
Sign makes up the trouble duration with corresponding each class component:
1) band sign A and the element that indicates B:
After fault took place, this class component was affected, and this class component restores electricity after the disconnector isolated fault.
Trouble duration=disconnector actuation time;
2) element of band sign C:
After fault took place, this class component was in fault section, and this class component is together isolated after the disconnector action, and after fault element was repaired the topology reinstatement, this class component just restored electricity.
Trouble duration=fault element repair time.
3) the band sign A is not with sign B and not with the element that indicates D:
After fault took place, this class component was affected, and this class component is not communicated with power supply after the disconnector isolated fault, and this class component is not communicated with power supply yet after changeing the confession switch motion.
Trouble duration=fault element repair time.
4) band sign A, not with the element that indicates B and band sign D, and the power supply nargin that is attached thereto is enough:
After fault took place, this class component was affected, and this class component is not communicated with power supply after the disconnector isolated fault, and this class component supplies to restore electricity through changeing after changeing the confession switch motion.
Trouble duration=commentaries on classics supplies the switch motion time.
5) band sign A, not with the element that indicates B and band sign D, what the power supply nargin that is attached thereto was not enough:
After fault took place, this class component was affected, and this class component is not communicated with power supply after the disconnector isolated fault, though this class component is communicated with power supply after changeing the confession switch motion, failed to supply to restore electricity through changeing.
Trouble duration=fault element repair time.
Indicate that wherein B, D and sign C are mutual exclusions, promptly an element is if band sign B or D then are with sign C scarcely; If band sign C, then band indicates B and is not with sign D scarcely.
6) band sign B and D, not with sign A and not with the element that indicates C:
This class component does not receive fault effects, and it is as usual that its power supply of back takes place fault.
7) not with the element of sign A, B, C or D:
This class component is not connected into power distribution network.
Introduce the embodiment of this method below through a demonstration example:
This example topology such as Fig. 5 are said, and it is as shown in the figure that each calculates the bus sequence number, and feeder line section 3-7 breaks down.This method has been made mark to each feeder line section and calculating bus, and employed method idiographic flow is of the 5th part.
As shown in Figure 6, each element has different interruption durations according to the difference of its tape label, and it is explained shown in the main flow of Fig. 1 embodiment of the invention:
1) only with the element of sign A, B, D:
After fault took place, this class component was affected, and this class component restores electricity after the disconnector isolated fault.
Trouble duration=disconnector actuation time;
2) only with the element of sign A, C:
After fault took place, this class component was in fault section, and this class component is together isolated after the disconnector action, and after fault element was repaired the topology reinstatement, this class component just restored electricity.
Trouble duration=fault element repair time.
3) only with the element of sign A:
After fault took place, this class component was affected, and this class component is not communicated with power supply after the disconnector isolated fault, and this class component is not communicated with power supply yet after changeing the confession switch motion.
Trouble duration=fault element repair time.
4) only with the element of sign A, D
After fault took place, this class component was affected, and this class component is not communicated with power supply after the disconnector isolated fault, and this class component is communicated with another road power supply after changeing the confession switch motion.
Trouble duration=commentaries on classics supplies the switch motion time.
5) only be with the element that indicates B, D:
This class component does not receive fault effects, and it is as usual that its power supply of back takes place fault.
Above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; The those of ordinary skill in said field is to be understood that: still can specific embodiments of the invention make amendment or replacement on an equal basis; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1. a status indication method that is used for evaluating reliability of distribution network is characterized in that said method comprises the steps:
The reliability result of 1-1) initialization distribution network;
1-2) judge whether feeder line section breaks down;
1-3) topological analysis the whole network calculates bus to feeder line section and two ends thereof before the normal open switch closure and puts sign A, upgrades the reliability result;
1-4) after the section breaker isolated fault and before the closed normal open switch, the fault section element is put sign C, the element that has restored electricity is put sign B, upgrade the reliability result;
1-5) topological analysis and power supply nargin are analyzed the whole network, judge closed normal open switch closure after each element whether be powered, the element of power path, the power supply of power supply nargin is put sign D, upgrade the reliability result;
1-6) judge whether i+1 bar feeder line section breaks down, until the fault judgement of accomplishing feeder line section;
1-7) output the whole network, each feeder line section, each element and load group corresponding reliable property index.
2. status indication method according to claim 1 is characterized in that said power distribution network comprises TRT, power transmitting device, transformation device, power distribution equipment and power device.
3. method according to claim 1 is characterized in that, at 1-3) step employing recursive algorithm, comprise the steps:
3-1) put sign A for the fault feeder section i that influenced by disconnection fault before the cut-off switch closure;
3-2) search the feeder line section database, be connected with feeder line section i if find feeder line section j, and feeder line section j no marks A, then get into 3-3);
After traveling through all feeder line section,, then return the last layer recurrence, end mark A if do not find satisfactory feeder line section;
3-3) if the bus impermanence switch that feeder line section i is connected with feeder line section j then gets into 3-4);
Otherwise, if feeder line section i has normal open switch with the bus that feeder line section j is connected, continue to search next bar and the feeder line section that feeder line section i is connected, return 3-2);
If it is disconnected to have traveled through all feeder lines, then return the last layer recurrence, end mark A;
3-4) put sign A for feeder line section j;
After 3-5) sign A is accomplished, get into one deck recurrence down, whether the feeder line section that search is connected with feeder line section j sign A.
4. method according to claim 1 is characterized in that, at 1-4) step employing recursive algorithm, concrete steps are following:
The feeder line section section that 4-1) can restore electricity after the cut-off switch isolation judges that whether calculate bus i is in fault section, if be in fault section, then returns the last layer recurrence, end mark B;
If be not in fault section, get into 4-2);
4-2) set sign B for calculating bus i;
4-3) judge to calculate whether corresponding normal open switch of bus i, if corresponding normal open switch then returns the last layer recurrence, end mark B;
If not corresponding normal open switch then gets into 4-4);
4-4) search feeder line section database is end points if find feeder line section j to calculate bus i, and feeder line section j do not indicate B and C, then gets into 4-5);
If traversal feeder line section database does not find to meet the feeder line section of above-mentioned condition, then return the last layer recurrence, end mark B;
4-5) put sign B for feeder line section j and corresponding calculating bus thereof, get into one deck recurrence down, whether search indicates B with the feeder line section that calculating bus j is connected.
5. method according to claim 1 is characterized in that, at 1-4) step flow process employing recursive algorithm, concrete steps are following:
5-1) find the affiliated section x of fault feeder section;
5-2) find all feeder line section that belong to section x, feeder line section and feeder line section two ends calculating bus are put sign C.
6. method according to claim 1 is characterized in that, at 1-5) step employing recursive algorithm, concrete steps are following:
6-1) judge that whether calculate bus i is in fault section, if be in fault section, then returns the last layer recurrence, end mark D;
If be not in fault section, get into 6-2);
6-2) set sign D for calculating bus i;
6-3) search feeder line section database is end points if find feeder line section j to calculate bus i, and feeder line section j do not indicate C and D, then gets into 6-4);
If traversal feeder line section database does not find to meet the feeder line section of above-mentioned condition, then return the last layer recurrence, end mark D;
6-4) give feeder line section j, and the corresponding bus that calculates puts sign D, get into one deck recurrence down, whether search indicates D with the feeder line section that calculating bus j is connected.
7. method according to claim 1 is characterized in that, said renewal reliability result is the real-time update to data in the power distribution network and device duty.
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| CN105162110A (en) * | 2015-08-24 | 2015-12-16 | 国网天津市电力公司 | Configuration method for sectionalizing and interconnection switches of power distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103217624A (en) * | 2013-03-18 | 2013-07-24 | 国家电网公司 | Power distribution network reliability assessment state labeling method based on segments |
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| CN104991843A (en) * | 2015-08-10 | 2015-10-21 | 国网上海市电力公司 | Work method of failure recovery processing module |
| CN105024358A (en) * | 2015-08-10 | 2015-11-04 | 国网上海市电力公司 | Working method of fault equivalence and intra-station load transfer module |
| CN105162110A (en) * | 2015-08-24 | 2015-12-16 | 国网天津市电力公司 | Configuration method for sectionalizing and interconnection switches of power distribution network |
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