CN103001216B - Method for quickly restoring power supply of power distribution network containing distributed power source - Google Patents
Method for quickly restoring power supply of power distribution network containing distributed power source Download PDFInfo
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Abstract
The invention relates to a method for restoring power supply of a power distribution network containing a distributed power source. The method is based on heuristic rules, performs dynamic island partition on the distributed power source, utilizes a connection switch to guarantee a power supply restoration scheme of the power distribution network to be adaptive to output changes of the distributed power source and continuous power supply of important users, and enables the intelligent power distribution network to operate safely, reliably and economically. Power supply restoration of the power distribution network comprises the steps that the power failure range of the power distribution network is determined by fault location information and an operating state of the power distribution network before the fault happens; and the distributed power source in the fault area is matched with the connection switch connected with the fault area, corresponding section switches are actuated, and radial operation of the power distribution network except for the distributed power source is ensured. The distributed power source is fully utilized to improve reliability of the power supply of the power distribution network, searching space is greatly reduced, and optimum strategy searching time is shortened. Therefore, the method is suitable for power supply restoration real-time operation of the power distribution network containing the distributed power source.
Description
Technical field
The present invention is a kind of for intelligent distribution network self-healing control system, utilize redundancy and the grid-connected distributed power source of Distribution system design to carry out the division of dynamic power isolated island, and by the coordinated manipulation of block switch and interconnection switch, realize intelligent distribution network technical scheme to the load fast recovery of power supply that has a power failure after fault, belong to power system security reliability service control technology field.
Background technology
The earth that the mankind depend on for existence just meets with the severe challenge of environment and resource, as Global climate change, natural calamity take place frequently, seriously polluted, traditional energy worsening shortages etc., selected intelligent grid (Smart Grid) in order to tackle these challenge world's power industries.Intelligent distribution network is the important component part of intelligent grid, and its principal character has self-healing, optimization, coordination, interaction, distribution and fusion etc., and wherein self-healing is core technology.Power distribution network is directly connected with user as the end of electric power system, and the height of its vis medicatrix naturae directly affects the power supply quality of electrical network to user, and it is key link wherein that distribution network failure recovers.Another principal character of intelligent grid is a large amount of accesses of distributed power source and makes full use of.The grid-connected code of existing distributed power generation does not allow islet operation, while requiring disturbance, distributed power source is exited rapidly, and this is not fully used to the distributed power source in fault zone, is unfavorable for improving distribution network reliability.How effectively to utilize distributed power source in fault zone to carry out service restoration significant to improving the power supply reliability of power distribution network.
Power distribution network service restoration refers to that power distribution network breaks down, and the optimization problem after fault location isolation, the dead electricity region of non-fault being restored electricity, its essence is the recovery reconstruction after power distribution network breaks down.In the time that feeder line generation permanent fault in power distribution network causes power failure, after Fault Isolation, for radial distribution feeder, non-faulty component will be divided into two parts: part and downstream part, faulty section (with respect to power supply point) are connected with power supply.Can restore electricity by the corresponding wire-outgoing breaker of coincidence transformer station for the former, the latter will be by the operation recovery power supply of the interconnection switch that is attached thereto.Therefore the recovery reconstruct after Distribution Network Failure is mainly to consider the non-fault dead electricity district (perfecting dead electricity region) in downstream, faulty section to restore electricity.
At present electrical power distribution automatization system not only can obtain remote signalling and the telemetry intelligence (TELINT) of switch, and action that can control switch, also possesses fault current detection ability simultaneously.But this failure recovering mode that utilizes power distribution network network structure and controller switching equipment (sectionalizer, automatic circuit etc.) automaticity, the general fairly simple power distribution network of network connection that is only used in, and in the time containing a large amount of distributed power source in power distribution network, how distributed power source is made full use of, this pattern can not meet actual requirement.The present invention can realize the quick service restoration under the distribution net work structure that contains distributed power source and operational mode, and has Failure Simulation and accident inversion function, is convenient to dispatcher and accumulates interruption of service processing experience and carry out intuitively accident operation.
Summary of the invention
technical problem:the object of this invention is to provide a kind of to carry out the method for service restoration containing the power distribution network of distributed power source, based on heuristic rule, distributed power source is carried out to dynamic isolated island division, utilize interconnection switch to ensure that power distribution network service restoration scheme can adapt to that exerting oneself of distributed power source changes and the continued power of responsible consumer simultaneously, make intelligent distribution network can be safely, reliably, economical operation.
technical scheme:power distribution network service restoration is the power failure range of determining electrical network according to the running status of electrical network before fault location information and fault.And coordinate by the distributed power source in fault zone and the interconnection switch that is connected with fault zone, move corresponding block switch simultaneously, and keep the radial operation of power distribution network except distributed power source.
The quick service restoration method of power distribution network containing distributed power source of the present invention adopts on the basis of the isolated island division based on distributed power source, and the isolated island that proposes distributed power source shifts capacity performance index, coordinates interconnection switch to carry out service restoration.Not only make full use of the power supply reliability that distributed power source has improved power distribution network, greatly dwindled search volume simultaneously, reduce optimal policy search time, be applicable to recover real time execution containing the supplying power allocation of distributed power source.
Concrete steps are as follows:
The first step: the network parameter of read failure locating information and distribution system, comprising: the branch road of circuit number, headend node and endpoint node numbering, transformer voltage ratio and branch impedance.Power distribution network is carried out depth coding and determines dead electricity scope;
Second step: the isolated island scheme verification that restores electricity: calculate the distributed power source total capacity within the scope of dead electricity load and dead electricity, difference more between the two, if meet isolated island equilibrium condition, turns the 9th step, otherwise enter next step;
The 3rd step: search for the interconnection switch that has the relation of being connected with dead electricity scope, calculate each interconnection switch reserve capacity and carry out descending sort by its size;
The 4th step: the scheme of the interconnection switch service restoration of the closed reserve capacity maximum of verification, call node voltage and the branch current of flow calculation program computing network, it is out-of-limit whether check-node voltage and branch current exist, out-of-limit when not existing, turn the 9th step, otherwise turn next step;
The 5th step: according to the switching information of previous step scheme, upgrade network code information, carry out distributed generator islanding division, and by institute's on-load size within the scope of each isolated island, it is carried out to descending sort according to isolated island division result;
The 6th step: according to the 5th step isolated island division result, the scheme of verification distributed generator islanding transfer load, call flow calculation program and calculate node voltage and the branch current of major network and isolated island, it is out-of-limit whether check-node voltage and branch current exist, out-of-limit when not existing, turn the 9th step, otherwise turn next step;
The 7th step: search for available interconnection switch, if without available interconnection switch, keep the scheme of the 6th step, turn the 8th step; Otherwise, screen corresponding block switch according to the radial service conditions of network, call node voltage and the branch current of flow calculation program computing network, it is out-of-limit whether check-node voltage and branch current exist, out-of-limit when not existing, turn the 9th step, otherwise turn the 5th step;
The 8th step: read important load information in network, comprise payload and load access point, form feasible cutting load scheme according to important load information, scheme is carried out to verification, calculate and lose load;
The 9th step: service restoration scheme is carried out in output.
Particularly, below each step of technical scheme of the present invention is elaborated:
The first step: power distribution network is carried out depth coding and determines that dead electricity scope is specially:
1) after distribution network failure occurs, read measurement equipment and obtain fault detect information, after Fault Identification, fault location, the switch of fault branch direct correlation is cut-off, complete Fault Isolation;
2) after Fault Isolation completes, will be divided into two parts for the non-faulty component of radial pattern distribution network failure point place feeder line: part and downstream part, faulty section are connected with power supply; Restore electricity by the corresponding wire-outgoing breaker of coincidence transformer station for the former, the latter will be by the operation recovery power supply of the interconnection switch that is attached thereto;
3) read the network parameter of distribution system, comprising: the branch road of circuit number, headend node and endpoint node numbering, transformer voltage ratio and branch impedance.Distribution network is traveled through, require to start to search for all nodes, branch road or branch line to endpoint node or from endpoint node to feed connection node from feed connection node, place feeder line is carried out to two-dimensional depth coding, form an array
represent a radial distribution networks network, wherein,
for node
father node number,
for node number,
for node
to the degree of depth of root node, i.e. level number;
4) power failure range is determined.According to formed two-dimensional depth coded message, started by malfunctioning node, the child node of search malfunctioning node, puts into power failure set of node by child node, then finds the child node of child node, until search network end-point.
Second step: the isolated island scheme verification that restores electricity is specially:
21) power failure range being obtained by the first step, determines the distributed power source in power failure range;
22) calculate the total load size in power failure range, computing formula is as follows:
Wherein
represent the total load in power failure range;
representation node
payload;
represent definite power failure range in the first step,
23) the total capacity size of all distributed source in calculating power failure range, computing formula is as follows:
Wherein
represent the total capacity of all distributed power sources in power failure range;
represent
individual distributed power source amount of capacity;
represent power failure range definite in the first step;
Determine the heap(ed) capacity departure allowing simultaneously
, computing formula is as follows:
Wherein
the maximum frequency deviation of the permission of representative system;
the rated frequency of representative system;
represent all distributed power source total capacities in power failure range;
represent the unit power regulation of generator.
24) judge
whether set up, if set up without utilizing interconnection switch to restore electricity, whole service restoration scheme search finishes, and turns the 9th step, otherwise enters the 3rd step;
The 3rd step: search candidate's interconnection switch, and carry out descending sort and be specially:
31) power failure range obtaining according to the first step, selects the interconnection switch being connected with power failure range as candidate's interconnection switch,
32) calculate the reserve capacity of each candidate's interconnection switch
, computing formula is as follows:
In formula: set
all set of fingers between the power supply of powering for interconnection switch and to this interconnection switch on path,
for branch road
the maximum current of permission;
flow through branch road
size of current.
33) according to step 32) calculate each candidate's interconnection switch reserve capacity size it is carried out to descending sort.
The 4th step: the scheme verification that restores electricity of the interconnection switch of reserve capacity maximum is specially:
41) carry out closed step 33) the interconnection switch operation of reserve capacity maximum in result;
42) call node voltage and the branch current of flow calculation program computing network, inspection whether exist node voltage or branch current out-of-limit, if exist, turn the 5th step, if without the service restoration scheme search end of out-of-limit phenomenon, turn the 9th step.
The 5th step: distributed generator islanding is divided, and by each isolated island scope internal loading size, it is carried out to descending sort and be specially;
51) according to switching manipulation information, the depth coding table of network is revised;
52) distributed power source is sorted.By step 51) in get the level number of the access point of each distributed power source in the depth coding table of gained, and distributed power source is carried out to ascending sort by its level number size, the row foremost of node degree of depth minimum, obtains distributed power source ranking results;
53) get step 52) distributed power source in gained ranking results, read its connecting system node number, and off-the-line node using this node as isolated island;
54) ask for off-the-line node downstream area.Started by off-the-line node, search for its child node, and then the child node of search child node, until search the end of network, this region is as distributed generator islanding supply district;
55) calculation procedure 54) in total load size in distributed generator islanding supply district, computing formula is as follows:
Wherein
represent the total load within the scope of isolated island;
representation node
payload;
represent step 54) in determined distributed generator islanding supply district,
56) calculation procedure 54) the interior all distributed source total capacity sizes of middle distributed generator islanding supply district, computing formula is as follows:
Wherein
represent the total capacity of all distributed power sources within the scope of isolated island;
represent
the amount of capacity of individual distributed power source;
represent step 54) in determined distributed generator islanding supply district.
Determine the heap(ed) capacity departure allowing
, computing formula is as follows:
Wherein
the maximum frequency deviation of the permission of representative system;
the rated frequency of representative system;
represent the total capacity of all distributed power sources within the scope of isolated island;
represent the unit power regulation of generator.
57) judge
whether set up, enter step 58 if set up), otherwise get step 52) next distributed power source in ranking results, go to step 53);
58) according to step 51) coded message of gained, ask for the father node of getting current off-the-line node, and be off-the-line node by his father's node updates, go to step 54),
The splitting point of each distributed power source obtaining is each distributed power source and forms the node number of the required off-the-line of maximum isolated island supply district, therefore it can represent the maximum isolated island supply district of each distributed power source.
The 6th step: the scheme of verification distributed generator islanding transfer load is specially:
61) judge out-of-limit type in the 4th step, if only there is voltage out-of-limit, go to step 62); Other out-of-limit types go to step 63);
62) isolated island the 5th step being formed from the electrical distance between out-of-limit voltage according to distributed power source in each isolated island sorts, and wherein the computing formula of electrical distance is:
Wherein
be represented as all node set between distributed power source and voltage out-of-limit node;
be represented as distributed power source exit voltage magnitude;
for node with load value;
63) isolated island the 5th step being formed carries out descending sort by its on-load size;
64) according to step 62) and 63) ranking results determine the isolated island of required formation, the switch that disconnects splitting point place forms first isolated island in ranking results, utilize isolated island transfer load, and call node voltage and the branch current of flow calculation program computing network; If out-of-limit elimination, the search of service restoration scheme finishes, and turns the 9th step; Otherwise go to step 65);
65) according to step 62) and 63) ranking results determine and the isolated island of required formation form next isolated island, disconnect the switch transfer load at splitting point place, until without out-of-limit existence, turn the 9th step; Turn the 7th step if cannot eliminate out-of-limit situation;
The 7th step: search for available interconnection switch and screen corresponding block switch according to the radial service conditions of network, this service restoration scheme of verification is specially:
71) determine whether exercisable candidate's interconnection switch, if there is not exercisable candidate's interconnection switch, turned the 8th step;
72) cancel the islanding operation in the 6th step;
73) judge the out-of-limit type in the 4th step, if only there is voltage out-of-limit, go to step 74); Other out-of-limit types go to step 75);
74) candidate's interconnection switch is sorted from the electrical distance between out-of-limit voltage according to each interconnection switch, wherein the computing formula of electrical distance is:
Wherein
all sets of node between being represented as between interconnection switch and the node of generation voltage out-of-limit;
for interconnection switch exit voltage magnitude;
for node with load value;
75) the rear interconnection switch in the ranking results that closed the 3rd step forms, calculates the transferable payload of the each candidate segment switch on path between the closed interconnection switch of this interconnection switch and the 4th step, and it is pressed to descending sort;
76) break step 75) the maximum block switch of transferable load in ranking results that forms; Call node voltage and the branch current of flow calculation program computing network, if do not exist node voltage or branch current out-of-limit, service restoration scheme search finishes, and turns the 9th step, otherwise turns the 5th step.
The 8th step: form feasible cutting load scheme according to important load information and be specially:
If complete according to above-mentioned steps, there is node voltage in search or branch current is out-of-limit or exist important load not restore electricity, and needs to take cutting load measure, and concrete steps are as follows:
81) read the important load information in network, comprise access node and payload;
82) get the access node of important load, the downstream area of search in access node;
83) judge whether required downstream area comprises important load, if comprise, get next load, go to step 82), otherwise go to step 84);
84) the total load size of calculating downstream area, its computational methods and step 55) identical;
85) to step 84) required result is by its big or small descending sort;
85) opening steps 85) the maximum corresponding block switch of middle and lower reaches loads, and call node voltage and the branch current of flow calculation program computing network, if do not exist node voltage or branch current out-of-limit, the search of service restoration scheme finishes; Turn the 9th step, carry out transfer load otherwise continue to disconnect next block switch, until without out-of-limit existence or without the switch of selectively actuatable.
beneficial effect:service restoration is the important means that improves distribution network reliability fast, when distributed power source accesses after power distribution network in a large number, how fully effectively utilizing distributed power source in fault zone to carry out fault recovery is very significant to the reliability that improves power distribution network.Adopt this method can make full use of the available capacity of distributed power source, can recover rapidly again the power supply that has a power failure and load simultaneously.This method has following several advantage:
(1) utilize distributed power source many places in the feature of power distribution network end, consider that distributed power source formation isolated island need be in network end-point (being convenient to the service restoration after fault is got rid of) so simultaneously.Upwards recall the maximum isolated island scope of search distributed power source from distributed power source access point.By the solution space of distributed generator islanding partition problem from
be reduced into
(wherein
for the number of block switch in network).
(2) utilize distributed power source to sort and determine the order of distributed generator islanding search from the depth size of power supply point, in the time that the distributed power source in upstream can form combination isolated island with downstream distribution formula power supply, the isolated island scope of the distributed power source in downstream can not searched for, can reduce total searching times, improve search efficiency.
(3) utilize interconnection switch and distributed power source to coordinate the fault service restoration that carries out power distribution network.The capacity that this method makes full use of distributed power source carries out service restoration; When distributed power source can recover dead electricity region when load, can accomplish that dead electricity region does not have a power failure carries out islet operation; In the time that distributed power source can not restore electricity completely, by itself and coordinating of interconnection switch carrying out service restoration.Also can effectively improve power supply reliability.
Brief description of the drawings
Fig. 1 is workflow diagram of the present invention.
Fig. 2 is distributed generator islanding service restoration workflow diagram of the present invention.
Fig. 3 is interconnection switch service restoration workflow diagram of the present invention.
Fig. 4 is that distributed generator islanding of the present invention is divided workflow diagram.
Fig. 5 is isolated island transfer load workflow diagram of the present invention.
Fig. 6 is cutting load operation element flow chart of the present invention.
Fig. 7 is the test example in enforcement example of the present invention, the node serial number of 1～69 expression system in figure, and DG1～DG8 represents the distributed power source numbering of connecting system.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is done more specifically bright:
Fig. 1 is the particular flow sheet containing the quick service restoration method of distributed power source provided by the invention
Table 1 provides access point and the capacity information of distributed power source that embodiment connects.
| Title | Bus | Meritorious (KW) | Title | Bus | Meritorious (KW) |
| DG1 | 2 | 50 | DG5 | 39 | 400 |
| DG2 | 8 | 350 | DG6 | 50 | 1500 |
| DG3 | 23 | 250 | DG7 | 56 | 250 |
| DG4 | 38 | 400 | DG8 | 58 | 250 |
Table 1 69 node system access DG information
1. carry out initialization according to the running status before fault location information and network failure, determine the state of system after the scope in dead electricity region and fault.
(1) as shown in Figure 7, if fault occurs between node 5-6, measurement equipment obtains fault detect information, through Fault Identification, fault location, subsequently the switch 5-6 of fault branch direct correlation is cut-off, and completes Fault Isolation;
(2) after Fault Isolation completes, will be divided into two parts for the non-faulty component of radial pattern distribution network failure point place feeder line: part (1-6,28-39,59-69) and downstream part, faulty section (6-27,40-58) is connected with power supply.
(3) obtain each node of distribution system and the link information of branch road, need to travel through distribution network, i.e. requirement can start to search for to endpoint node or from endpoint node to source node all nodes, branch road or branch line from source node.Place feeder line is carried out to two-dimensional depth coding, by an array
represent a radial networks, wherein,
for node
father node number,
for node number,
for node
to the degree of depth of root node, i.e. level number.If the coding result of node 6 is (5,6,5), represent that the degree of depth of node 6 is 5, its father node is node 5.
(4) fault coverage is determined.Set out by malfunctioning node (node 6), the child node (node 7) of trouble-shooting node, puts into power failure set of node by child node (node 7).Find again the child node (node 8) of child node 7, until search the end of network.The power failure range obtaining is { 6-27,40-58}.
2. the isolated island scheme verification that restores electricity;
(1) determine that by the access point of distributed power source and the power failure range of judging the distributed power source in power failure range is DG2, DG3, DG6, DG7, DG8.
(2) calculate the total payload in power failure range
=2686.65kW; Calculate total capacity of distributed power source in power failure range
=2600kW; Formula (3) calculates simultaneously
=104kW;
(3) can be found out by above result of calculation
be false;
3. search candidate's interconnection switch, the line ordering of going forward side by side;
According to power failure range can search out can candidate interconnection switch be 11-66,15-69,39-48; The reserve capacity size of calculated candidate interconnection switch, its size is respectively: 3337.9 kW, 3337.9 kW, 2030.34kW.Three candidate's interconnection switches are sorted by its reserve capacity size, and result is: 11-66,15-69,39-48;
4. the interconnection switch of the reserve capacity maximum scheme verification that restores electricity;
Selecting the interconnection switch 11-66 closure of reserve capacity maximum, carry out trend calculating, there is overload phenomenon and voltage out-of-limit situation in it, and the per unit value of its lowest section point voltage is 0.8400, therefore scheme proceeds to the 5th step operation;
5. the maximum isolated island supply district search of distributed power source in fault coverage;
(1) according to switch motion situation, i.e. Closing Switch 11-66 has isolated fault point 5-6 simultaneously; The two-dimensional depth coded message that the first step is obtained is revised; The coded message of revising posterior nodal point 6 is: (7,6,16).Illustrate that its node degree of depth becomes 16, father node becomes node 7.
(2) according to the coded message result newly obtaining and the access-in point information of distributed power source, distributed power source is sorted by the degree of depth of its access point, ranking results is: DG1, DG4, DG5, DG7, DG8, DG2, DG3, DG6.
(3) according to ranking results, first-selection is carried out isolated island search to DG1, its access node is node 2, the father node of node 2 is node 1, disconnected branches 1-2 forms isolated island, isolated island scope is: 2-69, the distributed power source within the scope of isolated island is DG1, DG4, DG5, DG7, DG8, DG2, DG3, DG6.Calculate within the scope of isolated island
=3762.97kW; Calculate the total capacity of distributed power source within the scope of isolated island
=3550kW; Formula calculates simultaneously
=142kW; Can be found out by above result of calculation
be false, DG1 can not form isolated island power supply;
(4) isolated island that continues next distributed power source is divided; Be DG4 by the next distributed power source of ranking results; Its access node is node 38, and the father node of node 38 is node 37, and disconnected branches 37-38 forms isolated island, and isolated island scope is: 38,39, and the distributed power source within the scope of isolated island is DG4, DG5.Calculate within the scope of isolated island
=765.4kW; Calculate the total capacity of distributed power source within the scope of isolated island
=800kW; Formula calculates simultaneously
=32kW; Can be found out by above result of calculation
set up; Continue up to recall disconnected branches 36-37 and form isolated island, isolated island scope is: 37,38,39, and the distributed power source within the scope of isolated island is DG4, DG5.Calculate within the scope of isolated island
=844.4kW; Calculate the total capacity of distributed power source within the scope of isolated island
=800kW; Formula calculates simultaneously
=32kW; Can be found out by above result of calculation
be false, thus the isolated island supply district that DG4 forms for DG4, DG5,38,39}, due to DG5 in DG4 downstream and can with DG4 form combination isolated island, therefore the isolated island scope of DG5 can be searched for.
(5) isolated island that continues next distributed power source is divided, until all isolated island scopes all determine, definite isolated island result is: { DG8, DG7, DG2, DG6,6-12,40-58}, { DG3,19-27}, { DG4, DG5,38,39}.
6. distributed generator islanding power supply transfer load scheme search;
Calculation of tidal current in (1) the 4th step is in network, not only to have existed electric current out-of-limit but also have voltage out-of-limit, therefore the isolated island scope of previous step gained is sorted by its transferable payload; Its payload is: 2318.85kW, 769.4kW, 176kW, ranking results are: { DG8, DG7, DG2, DG6,6-12,40-58}, { DG4, DG5,38,39}, { DG3,19-27};
(2) utilize the transfer of loading of the maximum isolated island of transferable load, disconnect block switch 12-13; Re-start trend and calculate, result shows that the per unit value of its lowest section point voltage is 0.9242 without out-of-limit situation generation.
7. output service restoration scheme
Can show that according to above step the required switch operating is 11-66 and 12-13.Form { DG8, DG7, DG2, DG6,6-12, the power supply of 40-58} isolated island.
Specific embodiment described herein is only the explanation for example of the present invention's spirit.Those skilled in the art can make various amendments or adopt similar mode to substitute described specific embodiment, but can not depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (9)
1. containing the quick service restoration method of power distribution network of distributed power source, it is characterized in that the method adopts on the basis of the isolated island division based on distributed power source, the isolated island that proposes distributed power source shifts capacity performance index, coordinates interconnection switch to carry out service restoration; Described method comprises the steps:
The first step: the network parameter of read failure locating information and distribution system, comprising: the branch road of circuit number, headend node and endpoint node numbering, transformer voltage ratio and branch impedance, power distribution network is carried out depth coding and determines power failure range;
Second step: the isolated island scheme verification that restores electricity: calculate the distributed power source total capacity in dead electricity load and power failure range, difference more between the two, if meet isolated island equilibrium condition, turns the 9th step, otherwise enter next step;
The 3rd step: search for the interconnection switch that has the relation of being connected with power failure range, calculate each interconnection switch reserve capacity and carry out descending sort by its size;
The 4th step: the scheme of the interconnection switch service restoration of the closed reserve capacity maximum of verification, the node voltage and the branch current that call flow calculation program computing network, it is out-of-limit whether check-node voltage and branch current exist, out-of-limit when not existing, turn the 9th step, otherwise turn next step;
The 5th step: according to the switching information of previous step scheme, upgrade depth coding information, carry out distributed generator islanding division, and by institute's on-load size within the scope of each isolated island, it is carried out to descending sort according to isolated island division result;
The 6th step: according to the 5th step isolated island division result, the scheme of verification distributed generator islanding transfer load, call flow calculation program and calculate node voltage and the branch current of major network and isolated island, it is out-of-limit whether check-node voltage and branch current exist, out-of-limit when not existing, turn the 9th step, otherwise turn next step;
The 7th step: search for available interconnection switch, if without available interconnection switch, keep the scheme of the 6th step, turn the 8th step; Otherwise, screen corresponding block switch according to the radial service conditions of network, call node voltage and the branch current of flow calculation program computing network, it is out-of-limit whether check-node voltage and branch current exist, out-of-limit when not existing, turn the 9th step, otherwise turn the 5th step;
The 8th step: read important load information in network, comprise payload and load access point, form feasible cutting load scheme according to important load information, scheme is carried out to verification, calculate and lose load;
The 9th step: service restoration scheme is carried out in output.
2. the quick service restoration method of power distribution network containing distributed power source according to claim 1, is characterized in that the described first step: power distribution network is carried out depth coding and determines that power failure range is specially:
1) after distribution network failure occurs, read measurement equipment and obtain fault detect information, after Fault Identification, fault location, the switch of fault branch direct correlation is cut-off, complete Fault Isolation;
2) after Fault Isolation completes, will be divided into two parts for the non-faulty component of radial pattern distribution network failure point place feeder line: part and downstream part, faulty section are connected with power supply; Restore electricity by the corresponding wire-outgoing breaker of coincidence transformer station for the former, the latter will be by the operation recovery power supply of the interconnection switch that is attached thereto;
3) read the network parameter of distribution system, comprising: the branch road of circuit number, headend node and endpoint node numbering, transformer voltage ratio and branch impedance; Distribution network is traveled through, require to start to search for all nodes, branch road or branch line to endpoint node or from endpoint node to feed connection node from feed connection node, place feeder line is carried out to two-dimensional depth coding, form an array (f
x, n
x, d
x) represent a radial distribution networks network, wherein, f
xfor the father node number of node x, n
xfor node number, d
xfor the degree of depth to root node of node x, i.e. level number;
4) power failure range is determined: according to formed two-dimensional depth coded message, started by malfunctioning node, the child node of search malfunctioning node, puts into power failure set of node by child node, then find the child node of child node, until search network end-point.
3. the quick service restoration method of power distribution network containing distributed power source according to claim 1, is characterized in that described second step: the isolated island scheme verification that restores electricity is specially:
21) power failure range being obtained by the first step, determines the distributed power source in power failure range;
22) calculate the total load size in power failure range, computing formula is as follows:
Wherein PL represents the total load in power failure range; P
lithe payload of representation node i; C
irepresent definite power failure range in the first step,
23) the total capacity size of all distributed power sources in calculating power failure range, computing formula is as follows:
Wherein PG represents the total capacity of all distributed power sources in power failure range; P
girepresent i distributed power source amount of capacity; C
irepresent power failure range definite in the first step;
Determine the heap(ed) capacity departure ε allowing, computing formula is as follows simultaneously:
Wherein Δ f
maxthe maximum frequency deviation of the permission of representative system; f
nthe rated frequency of representative system; PG represents all distributed power source total capacities in power failure range; K
grepresent the unit power regulation of generator;
24) judge whether PG-PL > ε sets up, if set up without utilizing interconnection switch to restore electricity, whole service restoration scheme search finishes, and turns the 9th step, otherwise enters the 3rd step.
4. the quick service restoration method of power distribution network containing distributed power source according to claim 1, is characterized in that the 3rd described step: search candidate's interconnection switch, and carry out descending sort and be specially:
31) power failure range obtaining according to the first step, selects the interconnection switch being connected with power failure range as candidate's interconnection switch,
32) calculate the reserve capacity I of each candidate's interconnection switch
m, computing formula is as follows:
In formula: set B is interconnection switch and to all set of fingers on path between the power supply of this interconnection switch power supply,
for the maximum current of the permission of branch road l; I
lflow through the size of current of branch road l;
33) according to step 32) calculate each candidate's interconnection switch reserve capacity size it is carried out to descending sort.
5. the quick service restoration method of power distribution network containing distributed power source according to claim 4, is characterized in that the 4th described step: the scheme of the interconnection switch service restoration of the closed reserve capacity maximum of verification is specially:
41) execution step 33) the interconnection switch operation of reserve capacity maximum in result;
42) call node voltage and the branch current of flow calculation program computing network, inspection whether exist node voltage or branch current out-of-limit, if exist, turn the 5th step, if without the service restoration scheme search end of out-of-limit phenomenon, turn the 9th step.
6. the quick service restoration method of power distribution network containing distributed power source according to claim 1, it is characterized in that the 5th described step: carry out distributed generator islanding division, and by institute's on-load size within the scope of each isolated island, it is carried out to descending sort according to isolated island division result and be specially;
51) according to switching manipulation information, the depth coding table of network is revised;
52) distributed power source is sorted: by step 51) in get the level number of the access point of each distributed power source in the depth coding table of gained, and distributed power source is carried out to ascending sort by its level number size, be the row foremost of node degree of depth minimum, obtain distributed power source ranking results;
53) get step 52) distributed power source in gained ranking results, read its connecting system node number, and off-the-line node using this node as isolated island;
54) ask for off-the-line node downstream area: started by off-the-line node, search for its child node, and then the child node of search child node, until search the end of network, this region is as distributed generator islanding supply district;
55) calculation procedure 54) in total load size in distributed generator islanding supply district, computing formula is as follows:
Wherein PL represents the total load within the scope of isolated island; P
lithe payload of representation node i; C
irepresent step 54) in determined distributed generator islanding supply district,
56) calculation procedure 54) the interior all distributed power source total capacity sizes of middle distributed generator islanding supply district, computing formula is as follows:
Wherein PG represents the total capacity of all distributed power sources within the scope of isolated island; P
girepresent the amount of capacity of i distributed power source; C
irepresent step 54) in determined distributed generator islanding supply district;
Determine the heap(ed) capacity departure ε allowing, computing formula is as follows:
Wherein Δ f
maxthe maximum frequency deviation of the permission of representative system; f
nthe rated frequency of representative system; PG represents the total capacity of all distributed power sources within the scope of isolated island; K
grepresent the unit power regulation of generator;
57) judge that whether PG-PL > ε sets up, and enters step 58 if set up), otherwise get step 52) next distributed power source in ranking results, go to step 53);
58) according to step 51) coded message of gained, ask for the father node of current off-the-line node, and be off-the-line node by his father's node updates, go to step 54),
The splitting point of each distributed power source obtaining is each distributed power source and forms the node number of the required off-the-line of maximum isolated island supply district, therefore it can represent the maximum isolated island supply district of each distributed power source.
7. the quick service restoration method of power distribution network containing distributed power source according to claim 1, is characterized in that the 6th described step: the scheme of verification distributed generator islanding transfer load is specially:
61) judge out-of-limit type in the 4th step, if only exist be voltage out-of-limit, go to step 62); Other out-of-limit types go to step 63);
62) isolated island the 5th step being formed from the electrical distance between out-of-limit voltage according to distributed power source in each isolated island sorts, and wherein the computing formula of electrical distance is:
Wherein C
pbe represented as all node set between distributed power source and voltage out-of-limit node; U
nbe represented as distributed power source exit voltage magnitude; I
lfor node with load value;
63) isolated island the 5th step being formed carries out descending sort by its on-load size;
64) according to step 62) and 63) ranking results determine the isolated island of required formation, the switch that disconnects splitting point place forms first isolated island in ranking results, utilize isolated island transfer load, and call node voltage and the branch current of flow calculation program computing network; If out-of-limit elimination, the search of service restoration scheme finishes, and turns the 9th step; Otherwise go to step 65);
65) according to step 62) and 63) ranking results determine and the isolated island of required formation form next isolated island, disconnect the switch transfer load at splitting point place, until without out-of-limit existence, turn the 9th step; Turn the 7th step if cannot eliminate out-of-limit situation.
8. the quick service restoration method of power distribution network containing distributed power source according to claim 1, it is characterized in that the 7th described step: search for available interconnection switch and screen corresponding block switch according to the radial service conditions of network, whether check-node voltage and branch current exist out-of-limit being specially:
71) determine whether exercisable candidate's interconnection switch, if there is not exercisable candidate's interconnection switch, turned the 8th step;
72) cancel the islanding operation in the 6th step;
73) judge the out-of-limit type in the 4th step, if only there is voltage out-of-limit, go to step 74); Other out-of-limit types go to step 75);
74) candidate's interconnection switch is sorted from the electrical distance between out-of-limit voltage according to each interconnection switch, wherein the computing formula of electrical distance is:
Wherein C
pall sets of node between being represented as between interconnection switch and the node of generation voltage out-of-limit; U
tsfor interconnection switch exit voltage magnitude; I
lfor node with load value;
75) the rear interconnection switch in the ranking results that closed the 3rd step forms, calculates the transferable payload of the each candidate segment switch on path between the closed interconnection switch of this interconnection switch and the 4th step, and it is pressed to descending sort;
76) break step 75) the maximum block switch of transferable load in ranking results that forms; Call node voltage and the branch current of flow calculation program computing network, if do not exist node voltage or branch current out-of-limit, service restoration scheme search finishes, and turns the 9th step, otherwise turns the 5th step.
9. the quick service restoration method of power distribution network containing distributed power source according to claim 6, is characterized in that the 8th described step: form feasible cutting load scheme according to important load information and be specially:
Exist out-of-limit or exist important load not restore electricity if complete search according to above-mentioned steps, needing to take cutting load measure, concrete steps are as follows:
81) read the important load information in network, comprise access node and payload;
82) get the access node of important load, the downstream area of search in access node;
83) judge whether required downstream area comprises important load, if comprise, get next load, go to step 82), otherwise go to step 84);
84) the total load size of calculating downstream area, its computational methods and step 55) identical;
85) to step 84) required result is by its big or small descending sort;
85) opening steps 85) the maximum corresponding block switch of middle and lower reaches loads, and call node voltage and the branch current of flow calculation program computing network, if do not exist node voltage or branch current out-of-limit, the search of service restoration scheme finishes; Turn the 9th step, carry out transfer load otherwise continue to disconnect next block switch, until without out-of-limit existence or without the switch of selectively actuatable.
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