CN112421612B - Medium-voltage main line branch line analysis method based on distribution network operation state - Google Patents

Abstract

The invention discloses a method for analyzing branch lines of medium-voltage trunk lines based on distribution network operation status, which obtains primary equipment information of main line branch lines to be analyzed currently, and constructs a static topology structure of feeders to be analyzed according to the topological connection points of the primary equipment. Obtain the power supply bus data, feeder data, and opening and closing status of the breaking equipment in the topology structure; obtain the remote signaling disconnection running time of the breaking equipment within the time interval according to the feeder automation data and operation ticket data; calculate the breaking equipment on each feeder The disconnection operation rate of the remote signal; according to the disconnection operation rate of the remote signal, the disconnection device of the tie switch is obtained; according to the tie switch, the main line and the branch line in the static topology are obtained. The present invention provides a method for analyzing branch lines of medium-voltage trunk lines based on distribution network operation status, which can avoid problems such as failure of trunk/branch line analysis due to model quality problems, and related applications that cannot be used normally.

Description

A branch line analysis method of medium voltage main line based on distribution network operation state

technical field

The invention relates to an analysis method for a branch line of a medium-voltage trunk line based on a distribution network operating state, and belongs to the technical field of power grid model analysis.

Background technique

Correctly analyzing the main line and branch line plays an important role in the analysis of the operating state of the power grid, fault location and restoration, analysis of branch power distribution, and network power loss. The basis of trunk/branch line analysis mainly depends on the completeness and correctness of the power grid model.

The grid model is a digital description of the objective power grid structure, and the grid network model is the basis for power system software analysis. The distribution network model is mainly imported from the geographic information system (GIS) or the production management system (PMS) and spliced with the energy management system (EMS) dispatching model. Some projects also build the distribution network model through manual maintenance. , in general, there are problems such as low quality of distribution network model, chaotic topological connectivity, and incomplete maintenance of equipment attributes. As a result, when analyzing the main line and branch line according to the standard, the information of the main line/branch line cannot be obtained or the path of the main line and branch line does not match the real path.

At present, the analysis of the main line and branch line of the medium-voltage distribution network is mainly based on the static topology of electrical equipment and the type and attribute of electrical equipment. The advantage of the existing analysis is that the main/branch line analysis method is simple and fast, but requires accurate basic data quality and complete equipment attributes, and the current distribution network is developing rapidly and the quality of the model varies from city to city. For the current development direction of the smart grid, the original analysis method has become increasingly unable to support the analysis method of the main line and branch line of the complex medium-voltage distribution network.

Main line: the shortest path between the medium voltage incoming line and the connecting equipment. It is the line with the largest transmission power, the highest voltage level or the most critical line in the power transmission system. It is responsible for the transmission of main power and the support and connection of the power grid where it is located. Once it is damaged, it will cause the power grid to disintegrate and hinder normal power transmission. Widespread power outages. Branch line: refers to the branch of the main line in the transmission system.

Contents of the invention

Purpose: In order to overcome the deficiencies in the prior art, the present invention provides a method for analyzing branch lines of medium-voltage trunk lines based on distribution network operation status.

Technical solution: In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is:

A method for analyzing branch lines of medium-voltage trunk lines based on distribution network operation status, comprising the following steps:

Step 1: Obtain the primary equipment information of the branch line feeder of the main trunk line to be analyzed, construct the static topology structure of the feeder line to be analyzed according to the topological connection points of the primary equipment, and obtain the power supply bus data, feeder line data, and opening and closing status of the disconnecting equipment from the static topology structure .

Step 2: According to the feeder automation data and operation ticket data, obtain the remote signaling disconnection running time of the disconnection device within the time interval.

Step 3: Calculate the remote signaling disconnection operating rate of the disconnecting equipment on each feeder.

Step 4: According to the disconnection operation rate of the remote signal, obtain the disconnecting device as the contact switch.

Step 5: Obtain the main line and branch line in the static topology according to the tie switch.

As a preferred solution, the static topology adopts a static topology of a ring network.

As a preferred solution, the specific steps of step 2 are as follows:

2.1 Set the time interval to obtain feeder automation data and operation ticket data;

2.2 Find the running time of remote signaling disconnection and remote signaling closing running time of the breaking equipment in the feeder automation data and operation ticket data;

2.3 If the breaking device is disconnected due to a fault, the remote signaling disconnection running time of the breaking device is restored to the closing running time, and the remote signaling disconnecting running time of the breaking device is the time interval minus the original closing running time and the restored closing time sum of running times;

2.4 If the breaking device is closed due to power transfer, the remote signaling closing running time of the breaking device is restored to the disconnecting running time, and the remote signaling disconnecting running time of the breaking device is the original disconnecting running time and the restored disconnecting running time Sum.

As a preferred solution, the formula for calculating the disconnection operation rate of the remote signal is as follows:

Among them, X represents the operation rate of remote signaling disconnection.

As a preferred solution, the specific steps of step 4 are as follows:

4.1 Obtain the device with the highest remote signal disconnection operation rate of disconnected devices on the topology;

4.2 If the number of equipment is 1, it is directly determined that the equipment is a contact switch;

4.3 If the number of equipment is multiple, determine whether the equipment has a transfer scheme in the feeder automation scheme or the type of equipment itself is a contact switch, then determine that the device is a contact switch;

4.4 If the number of devices is multiple and does not meet the judgment rules of 4.3, select the device that is far away from the power supply bus as the contact switch;

4.5 If there are multiple devices and none of the above judging rules are met, choose one device as the contact switch.

As a preferred solution, the specific steps of step 5 are as follows:

The feeder line between the power supply busbar and the tie switch is taken as the main line, and the feeder line connected to the main line is the branch line.

Beneficial effects: The present invention provides a branch line analysis method based on the operation status of the distribution network. Based on the quality of the current medium-voltage configuration model, the introduction of feeder automation data and operation ticket data are combined to enrich the basic analysis data and restore factors. Remote signal displacement information caused by failure, maintenance, transfer, etc., calculate the opening weight of each power supply path, re-determine the contact equipment, and analyze the trunk/branch line topology path.

The present invention improves the analysis method of the main line and the branch line, adopts the standard analysis method combined with FA (feeder automation), the remote signal state of the disconnecting equipment, and the hierarchical relationship of the equipment, enriches the basic analysis data, and further improves the quality of the main line/branch line branch results , so that it can minimize the failure of main/branch line analysis due to model quality problems, resulting in related applications not being able to use normally.

Description of drawings

Figure 1 is a static topology diagram.

Figure 2 is a topological state diagram before a fault.

Figure 3 is a topology state diagram after fault isolation and transfer.

Figure 4 is a topological path diagram between power supply buses.

Figure 5 is a diagram of the remote signaling disconnection operating rate of the topological path between power supply buses.

Figure 6 is the calculation diagram of the branch line of the trunk line.

detailed description

The present invention will be further described below in conjunction with specific examples.

A method for analyzing branch lines of medium-voltage trunk lines based on distribution network operation status, comprising the following steps:

Step 1. Create a static topology model of the ring network.

Obtain the primary equipment information of the branch line feeder of the trunk line to be analyzed currently, and construct the static topology structure of the ring network of the feeder line to be analyzed according to the topological connection points of the primary equipment. As shown in Figure 1, the topology of the ring network includes two feeders, feeder A and feeder B, which are respectively powered by power supply bus 1 and power supply bus 2. All letter states are closed by default.

As shown in Figure 2-3, step 2, data restoration of feeder automation data and operation ticket data.

According to the 2 feeders of the static topology of the ring network, within the set time interval (the time interval is configured according to the actual situation on site, the larger the time span, the higher the accuracy) the 2 feeders involve all feeder automation data and 2 There is associated operation ticket data for the breaking device in the feeder, and calculate the remote signaling closing running time and remote signaling disconnecting running time of the disconnecting device within the time interval according to the time interval, and calculate the data according to the feeder automation data and operation ticket data attributes to restore. The specific restore data is processed as follows:

Feeder automation data:

(1) For the feeder automation scheme, according to the remote signaling operation of the breaking equipment in the scheme, the disconnection running time and closing running time of the breaking equipment caused by the implementation of the automation remote control scheme are also included. For example: in the fault isolation transfer scheme: set The time interval is from 0:00 to 24:00 on August 8, 2019, and the time interval is 24 hours. The execution time of the fault isolation transfer plan will occur at 10:50 on August 8, 2019. The execution time of fault isolation and transfer recovery is: 13:10 on August 8, 2019. Then, the remote signal disconnection running time of disconnecting equipment 1-2 and 1-3 in the isolation scheme is 2 hours and 20 minutes. According to the feeder automation data, the disconnection of the disconnecting device is caused by a fault, so the disconnection running time is restored to Closing running time, that is, the breaking device does not open running, and the remote signaling off running time is 0 hours. However, in the isolation transfer scheme, the remote signal closing operation time of breaking equipment 1-5 is 2 hours and 20 minutes. According to the feeder automation data, the closing of the breaking equipment is caused by the transfer, so the closing running time is restored to the disconnecting running time, that is The breaking device does not have closed operation, and the remote signaling disconnection running time is 24 hours. By analogy, the running time of the remote signaling state of the breaking device affected by all feeder automation schemes within the time interval is restored in sequence.

Operation ticket data:

(1) According to the type of operation ticket, screen out the operation ticket that changes the remote signaling state of the disconnecting device, and get the running time of the remote signaling state according to the start and end time of the operation ticket. The running time of the remote signaling state of the disconnected device corresponding to the type of isolation or conversion is restored sequentially.

As shown in Figure 4-5, step 3, judge the tie switch for the breaking device.

Based on the characteristic that the tie switch is located on the topological path between different power supply buses, all the breaking devices with remote signaling on the topological path between feeder A and feeder B are found out. According to the time results of calculating the remote signaling closing operation and disconnecting operation in the above step 2, calculate the remote signaling disconnection operation rate of each breaking device, and the calculation formula is as follows:

X represents the remote signaling disconnection operation rate.

Update the calculation result to the corresponding breaking device, such as X=0 for breaking device 1-1, X=0 for 1-2, X=0.3 for 1-3, X=1,1-5 for 1-4 X=1 for 1-6, X=0 for 1-6, X=0 for 1-7, according to the calculation results, obtain the device with the highest remote signal disconnection operation rate of disconnected devices on the topological road. If the number of obtained devices is unique, it will be directly judged as The switch has the attribute of a contact switch in the current time interval; if there are multiple devices with the highest remote signal disconnection operation rate, it is judged whether the equipment with the same operation rate exists in the feeder automation scheme or the type of the switch itself is a tie switch, then it is determined that the breaking device is a tie switch. If there is no auxiliary judgment information, choose the tie switch which is far away from the power supply bus. If none of the above is satisfied, one of them can be selected as a contact switch. According to the calculation result of the online method, it is judged that the breaking device 1-5 is a tie switch.

As shown in Figure 6, step 4, path analysis of the trunk line and branch line.

According to the result of the tie switch calculated and judged by the process 3, and according to the branch line search rules of the main line, that is, the feeder between the power supply bus and the tie switch is the main line, and the feeder connected to the main line is the branch line, find out the main line 1-1 to 1-4 is the main line of feeder A, 1-10 to the end is the branch line path of feeder A, 1-7 to 1-6 is the main line of feeder B, and 1-8 to the end is the branch line path of feeder B.

Through the above-mentioned method steps, the present invention can avoid the problem of wrong analysis path of the branch line of the main line caused by wrong equipment attributes, unclear contact identification, and chaotic equipment hierarchy, etc., can accurately find out the topological path of the branch line of the main line, and truly reflect the current situation. Grid operation status.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (2)

1. A method for analyzing branch lines of medium-voltage main lines based on distribution network operation state, characterized in that: comprise the steps: Step 1: Obtain the primary equipment information of the branch line feeder of the main trunk line to be analyzed, construct the static topology structure of the feeder line to be analyzed according to the topological connection points of the primary equipment, and obtain the power supply bus data, feeder line data, and opening and closing status of the disconnecting equipment from the static topology structure ; Step 2: According to the feeder automation data and operation ticket data, obtain the remote signal disconnection running time of the disconnection device within the time interval; Step 3: Calculate the remote signal disconnection operation rate of the disconnection equipment on each feeder; Step 4: According to the disconnection operation rate of the remote signal, obtain the disconnecting device as the contact switch; Step 5: Obtain the main line and branch line in the static topology according to the tie switch; The specific steps of the step 2 are as follows: 2.1 Set the time interval to obtain feeder automation data and operation ticket data; 2.2 Find the running time of remote signaling disconnection and remote signaling closing running time of the breaking equipment in the feeder automation data and operation ticket data; 2.3 If the breaking device is disconnected due to a fault, the remote signaling disconnection running time of the breaking device is restored to the closing running time, and the remote signaling disconnecting running time of the breaking device is the time interval minus the original closing running time and the restored closing time sum of running times; 2.4 If the breaking device is closed due to power transfer, the remote signaling closing running time of the breaking device is restored to the disconnecting running time, and the remote signaling disconnecting running time of the breaking device is the original disconnecting running time and the restored disconnecting running time Sum; The formula for calculating the disconnection operation rate of the remote signal is as follows:

Among them, X represents the disconnection operation rate of remote signaling; The specific steps of step 4 are as follows: 4.1 Obtain the device with the highest remote signal disconnection operation rate of disconnected devices on the topology; 4.2 If the number of equipment is 1, it is directly determined that the equipment is a contact switch; 4.3 If the number of equipment is multiple, determine whether the equipment has a transfer scheme in the feeder automation scheme or the type of equipment itself is a contact switch, then determine that the device is a contact switch; 4.4 If the number of devices is multiple and does not meet the judgment rules of 4.3, select the device that is far away from the power supply bus as the contact switch; 4.5 If the number of devices is multiple, and none of the above judgment rules are met, choose one device as the contact switch; The specific steps of step 5 are as follows: The feeder line between the power supply busbar and the tie switch is taken as the main line, and the feeder line connected to the main line is the branch line. 2 . The method for analyzing branch lines of medium-voltage trunk lines based on distribution network operating status according to claim 1 , wherein the static topology structure adopts a static topology structure of a ring network. 3 .

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