CN109830956B - Method and device for searching power grid inter-partition transmission section - Google Patents
Method and device for searching power grid inter-partition transmission section Download PDFInfo
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Abstract
The invention discloses a method for searching a power transmission section of a power grid in different regions, which is characterized by comprising the following steps of; setting a tie line of a power grid between power supply areas to be in a disconnected state; setting a line with a specified voltage level to be in an on-off state; each electric island is formed in each area of the power grid through topology search, and each electric island containing a line node with a specified voltage level is judged to be 1 subarea; counting the number of the nodes contained in each power grid partition, setting a partition node number threshold, and judging whether all the nodes of the electric island are combined into the electric island connected with the nodes according to the threshold; the method comprises the steps of searching power sending-out lines and power sending-in lines of power grid partitions, determining power transmission sections of the power grid partitions according to judgment conditions of the power transmission sections, and solving the problem of requirements of an automatic identification system on the power transmission sections.
Description
Technical Field
The application relates to the field of on-line safety and stability calculation and analysis of power systems, in particular to a method for searching a power grid inter-regional power transmission section, and also relates to a device for searching the power grid inter-regional power transmission section.
Background
The interconnection among a plurality of regional power grids of the power grid in China is realized to form a large interconnected power grid, and interconnected tie lines among different load centers also form a power transmission channel. These transmission channels have a decisive influence on the safety and stability of the whole power grid, and are the key to maintain the safe and stable operation of the whole system. Therefore, the section is taken as an important target to be researched and analyzed in the process of researching and analyzing the power system.
In daily off-line calculation and analysis, power grid data are determined, main connecting lines can be basically determined in a manual analysis mode through physical structure, power generation and load distribution of a power grid, more critical power transmission channels can be determined through a large number of simulation calculations, and the safety and stability state of the whole system is analyzed.
The development and construction of the online stability assessment system have already obtained better popularization and application in the actual system of China. In the on-line process, since the computational analysis process of the system is automatically completed, people cannot directly participate in the computational analysis process of the system, and therefore, the analysis and judgment of the system need to be automatically performed. The power transmission section is used as a key factor of the system, and the power transmission section in the system needs to be automatically identified firstly in the online system, so that a foundation is laid for carrying out deep analysis and research and determining the key section subsequently.
Disclosure of Invention
The application provides a method for searching a power transmission section of a power grid in a partitioned mode, and solves the problem of the requirement of an automatic identification system on the power transmission section.
The application provides a method for searching a power transmission section of a power grid in a partitioned mode, which is characterized by comprising the following steps of;
setting a tie line of a power grid between power supply areas to be in a disconnected state; setting a line with a specified voltage level to be in an on-off state;
each electric island is formed in each area of the power grid through topology search, and each electric island containing a line node with a specified voltage level is judged to be 1 subarea;
counting the number of the nodes contained in each power grid partition, setting a partition node number threshold, and judging whether all the nodes of the electric island are combined into the electric island connected with the nodes according to the threshold;
and searching power sending-out lines and power sending-in lines of the power grid subareas, and determining the power transmission sections of the power grid subareas according to judgment conditions of the power transmission sections.
Preferably, the setting of the tie line of the inter-area power grid to the disconnected state specifically includes:
taking a load power supply area containing 500kV and 220kV as a power supply area, wherein the power supply area is only connected with other power supply areas through 500kV lines;
setting an inter-provincial connecting line of a power supply area to be in a disconnected state;
the line of 500kV and above voltage class is set to the on-off state.
Preferably, the determining each electrical island including line nodes of a given voltage class as 1 partition includes:
judging each electrical island containing 500kV nodes as a subarea;
electrical islands that do not contain 500kV nodes are ignored.
Preferably, the counting the number of nodes included in the power grid partition includes:
and counting the number of nodes of 500kV in each power grid partition.
Preferably, the setting of the partition node number threshold, and determining whether to merge all nodes of the electrical island into the electrical island connected to the electrical island according to the threshold, includes:
presetting a partition node number threshold;
and if the number of the nodes of the electric island is less than the threshold value, judging whether the electric island is only connected with 1 electric island, and if so, merging all the nodes of the electric island into the electric island connected with the electric island.
Preferably, the searching for the power sending-out line and the power sending-in line of the power grid partition, and determining the power transmission section of the power grid partition according to the judgment condition of the power transmission section, includes:
searching power sending-out lines and power sending-in lines of each subarea of the power grid one by one;
if only a power sending-out line or only a power sending-in line exists in the line of the power grid subarea, confirming that the line forms a power transmission section;
if the lines of the power grid subarea have a plurality of power sending-out lines and a plurality of power sending-in lines, judging whether the power grid can be divided into two independent networks by the set of the plurality of power sending-out lines and the plurality of power sending-in lines, and if so, confirming that the lines form a power transmission section.
Preferably, after the step of determining whether the power grid can be divided into two independent networks by the set of the multiple outgoing lines and the multiple power incoming lines if multiple outgoing lines and multiple power incoming lines exist in the lines of the power grid partition, and if yes, confirming that the lines form a power transmission section, the method further includes:
continuously searching a power sending-out line and a power sending-in line of the next power grid partition;
if not, selecting other power grid partitions connected with all the functions of the partitions flowing into the lines, and merging the partitions into a new power grid partition;
continuously searching power sending-out lines and power sending-in lines of the power grid partitions;
and continuously searching and combining until all power grid subareas are searched and processed.
This application provides a section's of electric wire netting subregion search device that transmits electricity simultaneously, its characterized in that includes:
the system comprises a preset unit, a control unit and a switching unit, wherein the preset unit is used for setting a tie line of a power grid between power supply areas to be in a disconnection state; setting a line with a specified voltage level to be in an on-off state;
the partitioning unit is used for forming each electric island through topology search in each area of the power grid, and judging each electric island containing a line node with a specified voltage level as 1 partition;
the partition processing unit is used for counting the number of the nodes contained in each power grid partition, setting a partition node number threshold value, and judging whether all the nodes of the electric island are combined into the electric island connected with the nodes according to the threshold value;
and the section determining unit is used for searching the power output line and the power input line of the power grid section and determining the power transmission section of the power grid section according to the judgment condition of the power transmission section.
Preferably, the section determining unit includes:
the searching subunit is used for searching power output lines and power input lines of each subarea of the power grid one by one;
the power transmission section determining subunit is used for determining that the line forms a power transmission section if only a power sending-out line or only a power sending-in line exists in the line of the power grid partition;
and the power transmission section determining subunit is used for judging whether the power grid can be divided into two independent networks by the set of the power sending-out lines and the power sending-in lines if the power grid subarea lines have a plurality of power sending-out lines and a plurality of power sending-in lines, and if so, determining that the lines form a power transmission section.
The method comprises the steps of carrying out partition preparation on a power grid through the characteristic that 500kV and 220kV power grids are connected, then realizing automatic partition of the power grid based on topology analysis, then processing the power plant output partition, and finally realizing partition discontinuous surface search of the power grid.
Drawings
Fig. 1 is a schematic flowchart of a method for searching an inter-regional power transmission section of a power grid according to an embodiment of the present application;
fig. 2 is a detailed flowchart of automatic partitioning of a power grid and searching of power transmission sections between partitions according to an embodiment of the present application;
fig. 3 is a schematic diagram of a device for searching a power transmission section of a power grid in a partitioned manner according to an embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for searching a power transmission section between power grids according to an embodiment of the present application, and the method according to the embodiment of the present application is described in detail below with reference to fig. 1.
Step S101, a tie line of a power grid between power supply areas is set to be in a disconnection state; the line of the specified voltage class is set to an open state.
The power grid in China is a network structure with a main voltage class of 500kV, a load power supply area refers to an area consisting of 500kV and 220kV lines, firstly, according to the characteristic that the 500kV and 220kV power grids of the power grid are connected, the load power supply area containing 500kV and 220kV is used as a power supply area, the power supply area is only connected with other power supply areas through the 500kV lines, and 500kV and 220kV line electromagnetic looped networks exist inside the power supply area. The power grid is automatically partitioned in units of provinces because the links between the provinces of the power grid are determined, and the partitions are prepared by setting the inter-provincial links of the power supply area to an off state and setting lines of a voltage class of 500kV or more to an on-off state.
Step S102, each electric island is formed in each area of the power grid through topology search, and each electric island containing line nodes with specified voltage levels is judged to be 1 subarea.
The automatic partitioning of the power grid is based on a topological structure of the power grid, each electric island is formed in each area of the power grid through topological search on the basis of step S101, each electric island containing 500kV nodes is judged to be a partition, and the electric islands not containing 500kV nodes are ignored.
Step S103, counting the number of the nodes contained in each power grid partition, setting a partition node number threshold, and judging whether all the nodes of the electric island are combined into the electric island connected with the electric island according to the threshold.
Counting the number of nodes contained in each power grid partition, setting a partition node number threshold, if the number of the nodes of the electric island is less than the threshold, judging whether the electric island is only connected with 1 electric island, if so, merging all the nodes of the electric island into the electric island connected with the electric island, wherein the electric island is a power plant generally meeting the conditions of the step, and sending the power plant out through a 500kV line for power generation.
And step S104, searching power sending-out lines and power sending-in lines of the power grid subareas, and determining the power transmission sections of the power grid subareas according to judgment conditions of the power transmission sections.
The transmission section is a set of transmission lines in the same direction, and the power sending-out line and the power sending-in line of each subarea of the power grid are searched one by one, and for the line of any power grid subarea, there are 3 conditions: 1) several power sending out lines and several power sending in lines exist; 2) only the power-off line exists; 3) only the power feeding line is present. For cases 2) and 3), if there is only a power outgoing line or only a power incoming line for a line of the grid section, it is confirmed that the line forms a transmission profile. If the lines of the power grid subarea have a plurality of power sending-out lines and a plurality of power sending-in lines, and for the case 1), judging whether the power grid can be divided into two independent networks by the collection of the plurality of power sending-out lines and the plurality of power sending-in lines, and if so, confirming that the lines form a power transmission section. All outgoing lines and all incoming lines may be part of the power transmission profile, but need not necessarily form a separate profile. And then, continuously searching a power sending-out line and a power sending-in line of the next power grid partition, if not, selecting other power grid partitions with all functions of the partitions connected with the incoming line, merging the power grid partitions into a new power grid partition, continuously searching the power sending-out line and the power sending-in line of the power grid partition, and continuously searching and merging until the searching processing of all the power grid partitions is finished.
The detailed flow of the automatic partitioning and the inter-partition transmission section searching of the power grid is shown in fig. 2, and the flow in the figure can be summarized as the following steps:
1) preparing a power grid partition;
2) automatically partitioning a power grid based on topology;
3) processing the power plant delivery subareas;
4) and searching for power grid partition discontinuities.
Next, with reference to the detailed flowchart provided in fig. 2, for the power grid in the south-Heisy province in the Chinese power grid, the power grid is partitioned by using an automatic partitioning method to obtain 14 partitions, and the main 500kV stations and the node numbers of the partitions are shown in the following table.
Table 1 Henan electric network partition table
| Partition sequence number | Number of nodes | Main 500kV station |
| 1 | 113 | Station _ chang station _ zang station _ wei station _ zhang song station \\u |
| 2 | 53 | Yao Meng factory-Xiangshan station-Zhan river station-Guangcheng station |
| 3 | 79 | Auspicious sign station-perizhuang station-chrysanthemum city station-saint temporary station \u |
| 4 | 53 | Boai station-bamboo worthy station |
| 5 | 35 | Capital flower station _ meeting station |
| 6 | 55 | Peony station _ economic source station \ u |
| 7 | 47 | Ferry station-Huji station |
| 8 | 101 | Jiahe station Ying Zhou station Shaanzhou station |
| 9 | 34 | river station _ Chunshen station \u |
| 10 | 53 | Shaling station _ Zhou station _ late camp station \ |
| 11 | 71 | Zhengzhou station-Songshan station-Wuzhou station |
| 12 | 57 | Capture station _ Tower station _ Jizhou station |
| 13 | 72 | Baihe station-quartz station-Xixian station-Yudu station \u |
| 14 | 36 | Aperture station _ Pimex station \ |
Then, the power transmission section and the line composition between the subareas are searched out and are shown in the following table.
TABLE 2 Henan electric network section and composition table
This application provides a search arrangement 300 of cross section that transmits electricity between electric wire netting subregion simultaneously, its characterized in that includes:
a preset unit 310, configured to set a tie line of a power grid between power supply areas to a disconnected state; setting a line with a specified voltage level to be in an on-off state;
the partition unit 320 is configured to form each electrical island by topology search in each area of the power grid, and determine each electrical island including a line node of a specified voltage class as 1 partition;
the partition processing unit 330 is configured to count the number of nodes included in each power grid partition, set a partition node number threshold, and determine whether to merge all nodes of the electrical island into the electrical island connected to the electrical island according to the threshold;
and the section determining unit 340 is configured to search power sending-out lines and power sending-in lines of the power grid partitions, and determine the power transmission sections of the power grid partitions according to judgment conditions of the power transmission sections.
Preferably, the section determining unit includes:
the searching subunit is used for searching power output lines and power input lines of each subarea of the power grid one by one;
the power transmission section determining subunit is used for determining that the line forms a power transmission section if only a power sending-out line or only a power sending-in line exists in the line of the power grid partition;
and the power transmission section determining subunit is used for judging whether the power grid can be divided into two independent networks by the set of the power sending-out lines and the power sending-in lines if the power grid subarea lines have a plurality of power sending-out lines and a plurality of power sending-in lines, and if so, determining that the lines form a power transmission section.
The method comprises the steps of carrying out partition preparation on a power grid through the characteristic that 500kV and 220kV power grids are connected, then realizing automatic partition of the power grid based on topology analysis, then processing the power plant output partition, and finally realizing partition discontinuous surface search of the power grid.
Claims (6)
1. A method for searching a power grid inter-partition power transmission section is characterized by comprising the following steps of;
setting a tie line of a power grid between power supply areas to be in a disconnected state; setting a line with a specified voltage level to be in an on-off state;
each electric island is formed in each area of the power grid through topology search, and each electric island containing line nodes with specified voltage levels is judged to be 1 power grid partition;
counting the number of nodes contained in each power grid partition, setting a partition node number threshold, and judging whether all nodes of the electric island are combined into the electric island connected with the electric island according to the partition node number threshold;
searching power output lines and power input lines of the power grid subarea, and determining the power transmission section of the power grid subarea according to the judgment condition of the power transmission section, wherein the method comprises the following steps: searching power sending-out lines and power sending-in lines of each subarea of the power grid one by one; if only a power sending-out line or only a power sending-in line exists in the line of the power grid subarea, confirming that the line forms a power transmission section; if the lines of the power grid subarea have a plurality of power sending-out lines and a plurality of power sending-in lines, judging whether the power grid can be divided into two independent networks by the set of the power sending-out lines and the power sending-in lines, and if so, confirming that the lines form a power transmission section; continuously searching a power sending-out line and a power sending-in line of the next power grid partition; if not, selecting other power grid partitions connected with all power inflow lines of the power grid partitions, and merging the power grid partitions and the other power grid partitions into a new power grid partition; continuously searching power sending-out lines and power sending-in lines of the power grid partitions; and continuously searching and combining until all power grid subareas are searched and processed.
2. The method according to claim 1, wherein the setting of the tie-line of the inter-supply-area power grid to the disconnected state comprises:
taking a load power supply area containing 500kV and 220kV as a power supply area, wherein the power supply area is only connected with other power supply areas through 500kV lines;
setting an inter-provincial connecting line of a power supply area to be in a disconnected state;
the line of 500kV and above voltage class is set to the on-off state.
3. The method of claim 1, wherein said determining each electrical island containing line nodes of a specified voltage class as 1 grid partition comprises:
judging each electric island containing 500kV nodes as a power grid subarea;
electrical islands that do not contain 500kV nodes are ignored.
4. The method according to claim 1, wherein the counting the number of nodes included in each grid partition comprises:
and counting the number of nodes of 500kV in each power grid partition.
5. The method according to claim 1, wherein the setting of the partition node number threshold value according to which whether to merge all nodes of the electrical island into the electrical island connected to the partition node number threshold value comprises:
presetting a partition node number threshold;
and if the number of the nodes of the electric island is less than the partition node number threshold, judging whether the electric island is only connected with 1 electric island, and if so, merging all the nodes of the electric island into the electric island connected with the electric island.
6. A searching device for a power grid inter-partition power transmission section is characterized by comprising:
the system comprises a preset unit, a control unit and a switching unit, wherein the preset unit is used for setting a tie line of a power grid between power supply areas to be in a disconnection state; setting a line with a specified voltage level to be in an on-off state;
the partitioning unit is used for forming each electric island through topology search in each area of the power grid, and judging each electric island containing a line node with a specified voltage level as 1 power grid partition;
the partition processing unit is used for counting the number of nodes contained in each power grid partition, setting a partition node number threshold value, and judging whether all the nodes of the electric island are combined into the electric island connected with the nodes according to the partition node number threshold value;
the section determining unit is used for searching power output lines and power input lines of the power grid partitions, and determining the power transmission sections of the power grid partitions according to judgment conditions of the power transmission sections, and comprises the following steps: the searching subunit is used for searching the power sending-out line and the power sending-in line of each subarea of the power grid one by one; the power transmission section determining subunit is used for determining that the line forms a power transmission section if only a power sending-out line or only a power sending-in line exists in the line of the power grid partition; and the power transmission section determining subunit is used for judging whether the power grid can be divided into two independent networks by the set of the power sending-out lines and the power sending-in lines if the power grid subarea lines have a plurality of power sending-out lines and a plurality of power sending-in lines, and if so, determining that the lines form a power transmission section.
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| CN104218673A (en) * | 2014-08-06 | 2014-12-17 | 国网上海市电力公司 | Automatic intelligent power grid partitioning method |
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