CN103116624B - A kind of automatic identifying method for medium voltage distribution network dual-ring network Connection Mode - Google Patents

Abstract

The invention discloses an automatic identification method for the double-ring network connection mode of a medium-voltage distribution network in the field of distribution network statistical evaluation. Its technical solution is to code the grid structure of the medium-voltage distribution network, and deeply search the number of power sources connected by the feeder to be detected; , match the distribution boxes or ring main unit queues passing through all single-ring network connection lines, and the single-ring network with matching queues is judged to be two independent single-ring double-ring networks; if the number of contact power sources is 3 , then enter the double-loop network discrimination of switch station type, adopt the combination of deep search and in-out search, analyze the number of contact power sources in the search process and the matching situation of contact lines passing through the switch station queue, and complete the switch station type Double ring network wiring pattern recognition. The invention effectively solves the problem of identification of the distribution network statistical evaluation software for the double-ring network connection mode.

Description

An automatic identification method for the double-ring network connection mode of the medium-voltage distribution network

technical field

The invention belongs to the field of statistical evaluation of distribution networks, and in particular relates to an automatic identification method for a double-ring network connection mode of a medium-voltage distribution network.

Background technique

Wiring mode recognition is an important index for statistical evaluation of distribution network. Double-ring network wiring is a wiring mode of medium-voltage distribution network, which is the target wiring mode of A, B, and C power supply areas. The double-ring network wiring includes two different realization modes: switching station type and two independent single-ring type. For the double-ring network wiring pattern recognition of the medium-voltage distribution network, it is necessary to develop corresponding software recognition algorithms for processing.

Designing and realizing the wiring pattern recognition algorithm of the double-ring network is an important part of realizing the statistical evaluation function of the medium-voltage distribution network. At present, the wiring pattern recognition algorithm of medium-voltage distribution network proposed in domestic and foreign literature mainly adopts the pattern recognition method. This method cannot complete the double-ring network wiring pattern recognition of the switching station type, and it is difficult to complete the accurate statistics and evaluation of the distribution network.

Contents of the invention

Aiming at the problem that current distribution network statistical evaluation software cannot automatically identify two types of double-ring network connection modes, the present invention proposes an automatic identification method for medium-voltage distribution network double-ring network connection modes.

An automatic identification method for the double-ring network connection mode of the medium-voltage distribution network, which is characterized by the following steps:

Step 1: Code all the feeders to be identified in the database, and the coding of each branch includes the code of the front node, the code of the rear node and the type of branch;

Step 2: For the feeder DK to be identified, start from its power supply node to find the connection power supply according to the connection relationship between the front and rear nodes of the branch, and define the connection path between the power supply nodes as the line trunk;

Step 3: If the number of power sources connected by the feeder DK to be identified is 1, it is temporarily judged as the single-ring network connection mode;

Step 4: Count the distribution boxes/ring network cabinet queues that all identified single ring networks pass through. It is a double-ring network of two independent single-ring types;

The steps for distinguishing two independent single-ring double-ring networks are as follows:

(1): Start deep traversal from the power supply node of the feeder to be detected, and power supply 1 can be searched, then the feeder is temporarily judged as a single ring network, record the name of the distribution box or ring main unit on the trunk traversal path, and form a queue [tap box A, distribution box B];

(2): For another feeder to be detected connecting power source 2 and power source 3, it is advisable to set up a deep traversal starting from power source 2, which can be judged as a single ring network and can form a queue [distribution box A, distribution box B] ;

(3): Match the distribution boxes or ring main unit queues formed by all single ring networks, then the distribution box queues of the feeder L1 and the feeder L2 are matched, and the four power supply nodes connected to the two are completely different, then the The wiring mode of feeder lines L1 and L2 is judged to be two independent single-ring double-ring networks;

Step 5: If the number of power sources connected by the feeder DK to be identified is 3, set the power source numbers as: 1, 2 and 3 respectively, then start the first entry and exit search from the power node of the feeder DK to be identified, and record The switching station queue L1 that the legal path passes through; the definition of in and out search is that the switch in the same switching station can only pass through the switch twice during the search process, and the path exceeding two times is an illegal path;

Step 6: If the number of contact power sources obtained by the first search in and out in step 5 is 1, then determine the power supply number of the contact power source; and choose one of the other two power sources to conduct the second search for in and out, Record the opening and closing station queue L2 passed by the legal path;

Step 7: If the number of contact power sources obtained by the second search in and out in step 6 is 1, then match the switching station queues L1 and L2. Identify the feeder DK and judge it to be a double-loop network of switching station type, and end.

The beneficial effect of the present invention is that it proposes an automatic identification method for the double-ring network connection mode of the medium-voltage distribution network. The number of feeder contact power sources is used as the prerequisite for discrimination, and the feeder is accurately passed through the switching station queue by using the in-out search. The solution has a clear concept, clear thinking, and accurate analysis and calculation, which can effectively solve the problem of identifying the wiring mode of the double-ring network by the statistical evaluation software of the distribution network.

Description of drawings

Fig. 1 is the backbone wiring diagram of the single ring network provided by the present invention;

Fig. 2 is the backbone wiring diagram of the double-ring network of two independent single-ring types provided by the present invention;

Fig. 3 is a schematic diagram of the entry and exit search rules provided by the present invention;

Fig. 4 is the trunk wiring diagram of the double-ring network of the switching station type provided by the present invention;

Fig. 5 is a flow chart for judging the connection mode of the double-ring network provided by the present invention.

Detailed ways

The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

Fig. 1 is the backbone wiring diagram of the single ring network provided by the present invention. In Figure 1, starting from the power node of the feeder to be detected, it is connected to another power node through several switches in the distribution box or ring main unit, thus forming a single ring network.

Fig. 2 is a main wiring diagram of two independent single-ring double-ring networks provided by the present invention. In Figure 2, it contains 4 power supply nodes and forms two tie lines, and the distribution boxes or ring main unit queues through which the two tie lines pass are the same. The steps for distinguishing two independent single-ring double-ring networks are as follows:

Step 1: Start in-depth traversal from the power supply node of the feeder to be detected. If power supply 1 can be found, the feeder is temporarily determined to be a single-ring network. Record the name of the distribution box or ring network cabinet on the trunk traversal path to form a queue [distribution box A, distribution box B];

Step 2: For another feeder to be detected connecting power source 2 and power source 3, it is advisable to start from power source 2 for in-depth traversal, which can be determined as a single-ring network and can form a queue [distribution box A, distribution box B];

Step 3: Match the distribution boxes or ring main unit queues formed by all single ring networks, then the distribution box queues of the feeder L1 and the feeder L2 are matched, and the 4 power nodes connected to the two are completely different, then the feeder line The wiring mode of L1 and L2 is judged to be two independent single-ring double-ring networks.

Fig. 3 is a schematic diagram of the entry and exit search rules provided by the present invention. The definition of in and out search is: during the search process, only two switches in the same switching station can be passed through, and more than two times are illegal paths. In Fig. 3, path 1 of the dotted line is a legal path because it only passes through two switching station switches when passing through switching station A, which satisfies the requirement of entering and exiting searches. Path 2 of the Dianhua line does not meet the requirements for entering and exiting searches because it passes through three switching stations.

Fig. 4 is a double-ring network backbone wiring diagram of the switching station type provided by the present invention. Compared with the double-ring network connection of two independent single-ring types, this connection mode has a tie switch between buses in the switching station. The identification steps of this type of double ring network wiring mode are as follows:

Step 1: Starting from the power node of the feeder to be detected, carry out in-depth traversal, and you can search for 3 contact power nodes, which may be named power 1, 2 and 3. Then start the in-out search from the power node of the feeder to be detected. At this time, the power source 1 can be searched, and the switch station queue [switch station A, switch station B] passed by the search path is recorded;

Step 2: Since the contact power source searched from the feeder to be tested is power source 1, choose one power source from the remaining power sources 2 and 3; you might as well choose power source 2 to search in and out, then you can search for power source 3 and record the in and out The opening and closing station queue [opening and closing station A, opening and closing station B] that the search path passes through;

Step 3: Since the two switching station queues obtained in step 1 and step 2 match each other, and the number of power sources obtained from the two in-out searches is 1, the feeder to be detected can be determined to be a double-loop network of switching station type wiring.

Fig. 5 is a flow chart for judging the connection mode of the double-ring network provided by the present invention. For other types of connection mode discrimination, corresponding simplification and omission are performed in FIG. 5 .

The present invention proposes relevant theoretical concepts of in-and-out search and queue matching of switching stations (distribution boxes, ring network cabinets), with clear ideas and precise calculations, and can accurately identify two types of double-ring networks in medium-voltage distribution networks .

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of changes or modifications within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (1)

1., for an automatic identifying method for medium voltage distribution network dual-ring network Connection Mode, its feature comprises the following steps:

Step 1: all feeder lines to be identified are carried out database coding, the coding of every bar branch road comprises front nodal point coding, posterior nodal point coding and branch type;

Step 2: for feeder line DK to be identified, from its power supply node, find contact power supply according to the annexation of node before and after branch road, be circuit trunk by the contact path definition between power supply node;

Step 3: if the power supply number that feeder line DK to be identified gets in touch with is 1, be then temporarily judged to be Single-ring network Connection Mode;

Step 4: add up distribution box/ring main unit queue that all Single-ring networks identified pass through, the Single-ring network identical and sequentially identical or contrary for distribution box/ring main unit queue content, is judged to be the dual-ring network of two separate single annular types by the two;

The discriminating step of the dual-ring network of two separate single annular types is:

(1): extreme saturation from the power supply node of feeder line to be detected, can search power supply 1, then feeder line is temporarily judged to be Single-ring network, and the distribution box in record trunk traverse path or ring main unit title, form queue [distribution box A, distribution box B];

(2): for getting in touch with power supply 2 and the other feeder line to be detected of power supply 3, might as well establish and carry out extreme saturation from power supply 2, can Single-ring network be judged to be, and queue [distribution box A, distribution box B] can be formed;

(3): the distribution box formed all Single-ring networks or ring main unit queue are mated, then feeder line L1 mates with the distribution box queue of feeder line L2, and the two 4 power supply node connect is completely different, then the Connection Mode of feeder line L1 and L2 is judged to be the dual-ring network of two separate single annular types;

Step 5: if the power supply number that feeder line DK to be identified gets in touch with is 3, setting power supply number is respectively: 1,2 and 3, then from the power supply node of feeder line DK to be identified, carry out first time passes in and out search, and records the Switching Station queue L1 passed through in legal path; Turnover search is defined as in search procedure the switch that can only pass twice through in same Switching Station, and more than twice is the illegal route;

Step 6: if in step 5, the contact power supply number of trying to achieve is searched in first time turnover is 1, then determine the power supply number of described contact power supply; And from two other power supply optional one carry out second time and pass in and out search, record the Switching Station queue L2 passed through in legal path;

Step 7: if in step 6, the contact power supply number of trying to achieve is searched in second time turnover is 1, then to opening and closing stand in line row L1 and L2 mate, if two queue content are identical and order is identical or contrary, then feeder line DK to be identified is judged to be the dual-ring network of Switching Station pattern, terminates.