Optimal arrangement method of power grid operation mode based on minimum power failure range

Abstract

The invention relates to a power grid operation mode optimal arrangement method based on a minimum power failure range. The method comprises the steps of power failure plan objectification processing, power grid bus wiring mode identification, equipment outage-based load transfer strategy construction, minimum power failure range statistics and formation of an optimal load transfer strategy. The defect that the intelligent level of power grid mode arrangement is low during equipment maintenance work approval in an open-loop operation power grid is overcome, the working mode that prefecture and county power grid maintenance plan work mainly depends on artificial experience is changed, a power grid primary equipment ledger, topology and operation data are utilized, the bus wiring mode in a plant station is automatically identified, and the power grid maintenance work is finished. In combination with an actual operation mode of the power grid, various load transfer strategies are automatically customized, an optimal load transfer strategy is formed through loss load minimization and power grid thermal stability check, the intelligent level and accuracy of power grid mode arrangement during equipment maintenance work approval are improved, and wrong arrangement of operation modes is avoided.

Description

Technical Field

[0001] The present invention relates to the field of power grid operation analysis, and specifically to an optimal arrangement method for power grid operation modes based on the minimum power outage range. Background Art

[0002] At present, the general power grid operation mode is that the power grid above 220 kV operates in a looped manner, and the power grid below 110 kV operates in an open-loop manner. Under the looped operation mode of the power grid above 220 kV, equipment maintenance generally does not cause power outages to users. However, in the local and county power grids below 110 kV, which generally operate in an open-loop manner, any equipment maintenance will cause power outages to users without adjusting the operation mode.

[0003] With the growth of the power grid load and the increasing scale of the power grid year by year, relying solely on manual arrangement of operation mode adjustment work for power grid equipment maintenance has a large workload, often with inadequate consideration, and it is easy to cause the power grid load transfer plan not to be optimal, leading to incorrect arrangements for power grid operation modes. Summary of the Invention

[0004] The present invention precisely aims at the deficiencies existing in the prior art and provides an optimal arrangement method for power grid operation modes based on the minimum power outage range.

[0005] To solve the above problems, the technical solutions adopted by the present invention are as follows:

[0006] An optimal arrangement method for power grid operation modes based on the minimum power outage range includes the following steps:

[0007] Step 1: Objectification processing of the power outage plan;

[0008] Step 2: Identification of the power grid bus connection mode;

[0009] Step 3: Construction of a load transfer strategy based on equipment outage;

[0010] Step 4: Statistics of the minimum power outage range;

[0011] Step 5: Formation of an optimal load transfer strategy.

[0012] Furthermore, in the above Step 1, the objectification processing of the power outage plan includes:

[0013] Obtain the power grid outage plan data from the power dispatching operation management system, including four types of outage plan data: annual, monthly, weekly, and daily. The information includes the name, unit, work content, outage start time, and outage end time of the outage equipment. Obtain the grid primary equipment ledger, topology, and operation information from the dispatching automation system. Establish a mapping relationship between the outage equipment name and the grid equipment ledger in the dispatching automation system through the word segmentation similarity matching technology, and further perform secondary correction on the outage equipment with low similarity through the page to ensure the complete objectification of the outage equipment in the outage plan.

[0014] Further, in the second step, the identification of the grid bus connection mode includes:

[0015] Construct a grid logic diagram for the grid primary equipment ledger, topology, and operation information in the dispatching automation system according to the equipment topology relationship and equipment operation conditions. Perform subgraph division on the logic diagram with two-layer constraints of the substation and voltage level to form multiple small connected logic diagrams. Take the small connected logic diagrams as units, extract the busbar equipment, and based on the graph theory traversal algorithm, form the connected link relationship from the busbar to the busbar and the connected link relationship from the busbar to other main equipment. According to the connected link relationship, identify and determine the bus connection mode, and distinguish single busbar, single busbar sectionalized, double busbar, double busbar single sectionalized, double busbar double sectionalized, 3 / 2 and 4 / 3 wiring. The other main equipment includes transformers, lines, and units.

[0016] Further, the method for identifying the bus connection mode is:

[0017] The identification of the single busbar: There is only one busbar in the smallest connected logic diagram, or there are multiple busbars but the number of links from the busbar to the busbar is 0.

[0018] The identification of the single busbar sectionalized: There are multiple busbars in the smallest connected logic diagram, and there is only one link from the busbar to the busbar.

[0019] The identification of the double busbar: There are multiple busbars in the smallest connected logic diagram, and there are two or more links from the busbar to the busbar. There is partial repetition between a certain link from the busbar to the busbar and two links from the busbar to the equipment, and the two links connect to the same final equipment.

[0020] The identification of the double busbar single sectionalized and double busbar double sectionalized: On the basis of the double busbar determination, when removing the links with partial repetition between the busbar-to-busbar connection and the busbar-to-equipment, and there is only one remaining link from the busbar to the busbar and the two busbars are not double busbars, it is identified as sectionalized.

[0021] The identification of the 3 / 2 and 4 / 3 wiring: There are more than 2 breaker equipment in the links from the busbar to the busbar.

[0022] Further, in the third step, the construction of the load transfer strategy based on equipment outage includes:

[0023] According to the object-oriented power outage equipment described in step one, with the goal of minimizing the loss load, combined with the identification of the busbar wiring method in step two, a power grid equipment linkage power transfer strategy after the equipment is shut down is automatically generated as a load transfer strategy.

[0024] Furthermore, the power grid equipment linkage power transfer strategy includes:

[0025] Single busbar: When a main supply device is under maintenance, it will automatically switch to another standby device on the busbar.

[0026] Single-bus segmentation: When a main supply device is under maintenance, it will automatically switch to a standby device or turn the bus tie switch to operation. When a bus is under maintenance, it will automatically identify the lower-level wiring method and start linkage.

[0027] Double mother: When a main supply equipment is under maintenance, the bus tie switch will automatically switch to the operating state; when a bus is under maintenance, all the bus equipment will automatically switch to another bus.

[0028] 3 / 2 and 4 / 3 wiring: When a main supply device is under maintenance, its switch is automatically switched to the maintenance state without causing the state of other devices to change.

[0029] Furthermore, in step 4, the minimum power outage range statistics include:

[0030] On the basis of step three, multiple sets of power grid equipment linkage strategies that can be triggered by any equipment maintenance are constructed, the power grid equipment status changes are extracted from each set of power grid equipment linkage strategies, and the equipment status in the power grid logic diagram in step two is changed. Through graph theory traversal and interconnected graph solving algorithms, it is compared whether new isolated interconnected subgraphs are generated before and after the equipment status change, and the load data of the subgraph is counted to obtain the power outage range and load loss situation. The load loss situation under each set of strategies is ranked, and the multiple sets of strategies with the smallest load loss and the lower ranking are set as the minimum power outage range.

[0031] Furthermore, in step 5, forming the optimal load transfer strategy includes:

[0032] On the basis of step 4, the power grid logic diagram is reset for multiple transfer strategies with the smallest loss load, and it is traversed upward from the terminal node in sequence. The statistics of any high-voltage main transformer, line load and equipment overload are aggregated. If the equipment load rate exceeds 80%, it is recorded. For each transfer strategy, the one with the least overloaded equipment and the lowest load rate is set as the optimal load transfer strategy.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The optimal arrangement method for the power grid operation mode based on the minimum power outage range proposed by the present invention solves the defect of low intelligent level in power grid mode arrangement during the approval of equipment maintenance work in the open-loop operation power grid compared with the existing technologies, changes the work mode that mainly relies on manual experience in the maintenance plan work of the local and county power grids, automatically identifies the bus connection mode in the substation by using the power grid primary equipment account, topology and operation data, combines with the actual operation mode of the power grid, automatically customizes a variety of load transfer strategies, forms the optimal load transfer supply strategy through minimizing the lost load and checking the thermal stability of the power grid, improves the intelligent level and accuracy of power grid mode arrangement during the approval of equipment maintenance work, and prevents incorrect arrangement of the operation mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a flowchart of the optimal arrangement method for the power grid operation mode based on the minimum power outage range of the present invention;

[0036] Figure 2 is a visual effect diagram of the power grid logic diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The content of the present invention will be described below in conjunction with specific embodiments. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout.

[0038] The directional terms mentioned in the present invention, such as: up, down, left, right, front, back, inside, outside, front side, back side, side, etc., are only the directions of reference to the drawings. The embodiments described below with reference to the drawings and the directional terms used are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention. In addition, for the various specific examples of processes and materials provided by the present invention, those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0039] Please refer to Figure 1 , Figure 1 which is a flowchart of the optimal arrangement method for the power grid operation mode based on the minimum power outage range of the present invention.

[0040] 1. The optimal arrangement method for the power grid operation mode based on the minimum power outage range is characterized by including the following steps:

[0041] Step 1: Objectification processing of the power outage plan:

[0042] The objectification process of the power outage plan includes: obtaining power grid outage plan data from the power dispatching operation management system, including four types of outage plan data: annual, monthly, weekly, and daily. The information includes the name, unit, work content, power outage start time, and power outage end time of the outage equipment. Obtain the power grid primary equipment ledger, topology, and operation information from the dispatching automation system. Establish a mapping relationship between the outage equipment name and the power grid equipment ledger in the dispatching automation system through the word segmentation similarity matching technology, and further perform secondary correction on the outage equipment with low similarity through the page to ensure the complete objectification of the outage equipment in the power outage plan.

[0043] Step 2: Identification of the power grid bus connection mode:

[0044] Construct a power grid logic diagram for the power grid primary equipment ledger, topology, and operation information in the dispatching automation system according to the equipment topology relationship and equipment operation conditions. Perform sub-graph division on the logic diagram with two-layer constraints of the substation and voltage level to form multiple small connected logic diagrams. Take the small connected logic diagrams as units, extract the bus equipment, and based on the graph theory traversal algorithm, form the connected link relationship from bus to bus and the connected link relationship from bus to other main equipment. According to the connected link relationship, identify and determine the bus connection mode, and distinguish single bus, single bus sectionalized, double bus, double bus single sectionalized, double bus double sectionalized, 3 / 2 and 4 / 3 wiring. The other main equipment includes transformers, lines, and units.

[0045] The method for identifying the bus connection mode is as follows:

[0046] The identification of single bus: There is only one bus in the smallest connected logic diagram, or there are multiple buses but the number of links from bus to bus is 0.

[0047] The identification of single bus sectionalized: There are multiple buses in the smallest connected logic diagram, and there is only one link from bus to bus.

[0048] The identification of double bus: There are multiple buses in the smallest connected logic diagram, and there are two or more links from bus to bus. There is partial repetition between a certain link from bus to bus and two links from bus to equipment, and the two links connect to the same final equipment.

[0049] The identification of double bus single sectionalized and double bus double sectionalized: On the basis of the double bus determination, when removing the links from bus to bus that have partial repetition with the links from bus to equipment, and there is only one remaining link from bus to bus and the two buses are not double buses, it is identified as sectionalized.

[0050] The identification of 3 / 2 and 4 / 3 wiring: There are more than 2 breaker devices in the links from bus to bus.

[0051] Step 3: Construction of the load transfer strategy based on equipment outage:

[0052] According to the object-oriented power outage equipment described in step one, with the goal of minimizing the loss load, combined with the identification of the busbar wiring method in step two, a power grid equipment linkage power transfer strategy after the equipment is shut down is automatically generated as a load transfer strategy.

[0053] The grid equipment linkage power transfer strategy includes:

[0054] Single busbar: When a main supply device is under maintenance, it will automatically switch to another standby device on the busbar.

[0055] Single-bus segmentation: When a main supply device is under maintenance, it will automatically switch to a standby device or turn the bus tie switch to operation. When a bus is under maintenance, it will automatically identify the lower-level wiring method and start linkage.

[0056] Double mother: When a main supply equipment is under maintenance, the bus tie switch will automatically switch to the operating state; when a bus is under maintenance, all the bus equipment will automatically switch to another bus.

[0057] 3 / 2 and 4 / 3 wiring: When a main supply device is under maintenance, its switch is automatically switched to the maintenance state without causing the state of other devices to change.

[0058] Step 4: Statistics of the minimum power outage range:

[0059] On the basis of step three, multiple sets of power grid equipment linkage strategies that can be triggered by any equipment maintenance are constructed, the power grid equipment status changes are extracted from each set of power grid equipment linkage strategies, and the equipment status in the power grid logic diagram in step two is changed. Through graph theory traversal and interconnected graph solving algorithms, it is compared whether new isolated interconnected subgraphs are generated before and after the equipment status change, and the load data of the subgraph is counted to obtain the power outage range and load loss situation. The load loss situation under each set of strategies is ranked, and the multiple sets of strategies with the smallest load loss and the lower ranking are set as the minimum power outage range.

[0060] Step 5: Form the optimal load transfer strategy:

[0061] On the basis of step 4, the power grid logic diagram is reset for multiple transfer strategies with the smallest loss load, and it is traversed upward from the terminal node in sequence. The statistics of any high-voltage main transformer, line load and equipment overload are aggregated. If the equipment load rate exceeds 80%, it is recorded. For each transfer strategy, the one with the least overloaded equipment and the lowest load rate is set as the optimal load transfer strategy.

[0062] Example:

[0063] (1) Targeted processing of power outage plans

[0064] Power outage schedule data:

[0065]

[0066] Objectification processing:

[0067]

[0068] (2) Identification of grid bus connection mode

[0069] Bus equipment: 110kV I bus of XX Substation in City B, 110kV II bus of XX Substation in City B. Link relationship between buses:

[0070] 1) 110kV I bus of XX Substation in City B --> 110kV 5001 disconnector of XX Substation in City B --> 110kV sectional 500 switch of XX Substation in City B --> 110kV 5002 disconnector of XX Substation in City B --> 110kV II bus of XX Substation in City B

[0071] Link relationship between bus and other equipment:

[0072] 1) 110kV I bus of XX Substation in City B --> 110kV 6931 disconnector of XX Substation in City B --> 110kV Guanglai 693 switch of XX Substation in City B --> 110kV 6933 disconnector of XX Substation in City B --> 110kV Guanglai 693 line in City B

[0073] 2) 110kV I bus of XX Substation in City B --> 110kV 5011 disconnector of XX Substation in City B --> 110kV #1 main transformer 501 switch of XX Substation in City B --> 110kV 5013 disconnector of XX Substation in City B --> 110kV #1 main transformer in City B

[0074] 3) 110kV II bus of XX Substation in City B --> 110kV 6941 disconnector of XX Substation in City B --> 110kV Huan Guang 694 switch of XX Substation in City B --> 110kV 6943 disconnector of XX Substation in City B --> 110kV Huan Guang 694 line in City B

[0075] 4) 110kV II bus of XX Substation in City B --> 110kV 5021 disconnector of XX Substation in City B --> 110kV #2 main transformer 502 switch of XX Substation in City B --> 110kV 5023 disconnector of XX Substation in City B --> 110kV #2 main transformer in City B

[0076] Visual effect of grid logic diagram: As Figure 2 shown.

[0077] Identification result of bus connection mode: Single bus sectionalization

[0078] (3) Construction of load transfer strategy based on equipment outage

[0079] According to the objectified maintenance equipment in (1): 110kV Huan'guang 694 Line in City B;

[0080] (2) The identified wiring method: single busbar sectionalized

[0081] Adopt the load transfer strategy: within the single busbar sectionalized wiring area, when a main power supply equipment is under maintenance, the standby equipment is automatically switched or the bus-coupler switch is changed to the operating state; when a busbar is under maintenance, the lower-level wiring method is automatically identified for linkage.

[0082] When the main power supply equipment "110kV Huan'guang 694 Line in City B" is under maintenance, according to the actual operating state of the equipment, "110kV Sectional 500 Switch in a certain substation in City B" is in the operating state, while "110kV Guanglai 693 Switch in a certain substation in City B" is in the outage state. Therefore, the constructed load transfer strategy is:

[0083] "110kV Guanglai 693 Switch in a certain substation in City B" or "110kV Guanglai 693 Line in City B" is changed to the operating state.

[0084] (4) Statistics of the minimum power outage range

[0085] According to the strategy in (3) that "110kV Guanglai 693 Switch in a certain substation in City B" or "110kV Guanglai 693 Line in City B" is changed to the operating state, the equipment state in the power grid logic diagram is changed. Through graph theory traversal and connected graph solving algorithm, it can be known that there is no load loss.

[0086] (5) Formation of the optimal load transfer strategy

[0087] Based on (4), reset the power grid logic diagram and traverse from the end nodes upwards in sequence. It can be known that all loads are transferred to "110kV Guanglai 693 Line in City B". Through aggregation statistics, the load rate of "110kV Guanglai 693 Line in City B" is 31.7% (where the total aggregated load is 32.3MW and the limit value is 102MW), which does not exceed 80%. Therefore, the load transfer strategy is feasible and is used as the optimal load transfer strategy.

[0088] This application solves the defect of low intelligence level of grid arrangement when approving equipment maintenance work in open-loop power grids, changes the working mode in which county power grid maintenance planning work mainly relies on manual experience, and uses the primary equipment ledger, topology and operation data of the power grid to automatically identify the busbar wiring method in the plant station, and automatically customizes a variety of load transfer strategies based on the actual operation mode of the power grid. By minimizing loss load and verifying the thermal stability of the power grid, the optimal load transfer strategy is formed, which improves the intelligence level and accuracy of grid arrangement when approving equipment maintenance work and eliminates the wrong arrangement of operation mode.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for optimally arranging the operation mode of a power grid based on a minimum power outage range, characterized in that: The following steps are involved: Step 1: Object-oriented processing of power outage plan; Step 2: Identify the grid busbar wiring method; Step 3: Construct load transfer strategy based on equipment outage; Step 4: Statistics of the minimum power outage range; Step 5: Form the optimal load transfer strategy.

2. The method for optimally arranging the operation mode of a power grid based on the minimum power outage range according to claim 1, characterized in that: In the step 1, the object-oriented processing of the power outage plan includes: The power grid outage plan data is obtained from the electric power dispatching and operation management system, including four types of power outage plan data: annual, monthly, weekly and daily. The information includes the name, unit, work content, power outage start time and power outage end time of the power outage equipment. The power grid primary equipment ledger, topology and operation information are obtained from the dispatching automation system. The mapping relationship between the power outage equipment name and the power grid equipment ledger in the dispatching automation system is established through the word segmentation similarity matching technology, and the power outage equipment with low similarity matching is further corrected through the page to ensure that the power outage plan and power outage equipment are fully object-oriented.

3. The method for optimally arranging the operation mode of a power grid based on the minimum power outage range according to claim 2, characterized in that: In the step 2, the identification of the grid bus connection mode includes: The power grid logic diagram is constructed according to the equipment topology relationship and equipment operation status of the power grid primary equipment ledger, topology and operation information in the dispatching automation system. The logic diagram is divided into sub-graphs based on the two-layer constraints of plant station and voltage level to form multiple small interconnected logic diagrams. Busbar equipment is extracted based on the small interconnected logic diagram, and the interconnection link relationship between busbar and busbar and the interconnection link relationship between busbar and other main equipment are formed based on the graph theory traversal algorithm. According to the interconnection link relationship, the busbar wiring mode is identified and determined, and single busbar, single busbar segmented, double busbar, double busbar single-divided, double busbar double-divided, 3 / 2 and 4 / 3 wiring are distinguished. The other main equipment includes transformers, lines and units.

4. The method for optimally arranging the operation mode of a power grid based on the minimum power outage range according to claim 3 is characterized in that: The busbar wiring mode identification method is: The single bus identification: there is only one bus in the minimum interconnection logic diagram, or there are multiple buses but the number of bus-to-bus links is 0; The single bus segment identification: there are multiple buses in the minimum interconnection logic diagram, and there is only one bus-to-bus link; The dual-bus identification: there are multiple buses in the minimum interconnection logic diagram, there are two or more bus-to-bus links, a bus-to-bus link and two bus-to-device links are partially repeated, and the final device connected by the two links is the same device; The identification of dual-bus single-split and dual-bus dual-split: based on the dual-bus determination, if the bus-to-bus connection removes some duplicate links between the bus and the equipment, and there is only one remaining bus-to-bus link and the two buses are not dual-bus, it is considered as segmented; The 3 / 2 and 4 / 3 wiring identification: there are more than 2 circuit breaker devices in the bus-to-bus link.

5. The method for optimally arranging the operation mode of a power grid based on the minimum power outage range according to claim 4, characterized in that: In the step 3, the load transfer strategy based on equipment outage is constructed including: According to the object-oriented power outage equipment described in step one, with the goal of minimizing the loss load, combined with the identification of the busbar wiring method in step two, a power grid equipment linkage power transfer strategy after the equipment is shut down is automatically generated as a load transfer strategy.

6. The method for optimally arranging the operation mode of a power grid based on the minimum power outage range according to claim 5, characterized in that: The grid equipment linkage power transfer strategy includes: Single busbar: When a main supply device is under maintenance, it will automatically switch to another standby device on the busbar; Single busbar segmentation: when a main supply device is under maintenance, it will automatically switch to a standby device or turn the busbar tie switch to the operating state; when a busbar is under maintenance, it will automatically identify the lower-level wiring mode for linkage; Double bus: When a main supply device is under maintenance, the bus tie switch will automatically switch to the operating state; when a bus is under maintenance, all the bus equipment will automatically switch to another bus; 3 / 2 and 4 / 3 wiring: When a main supply device is under maintenance, its switch is automatically switched to the maintenance state without causing the state of other devices to change.

7. The method for optimally arranging the operation mode of a power grid based on the minimum power outage range according to claim 6, characterized in that: In step 4, the minimum power outage range statistics include: On the basis of step three, multiple sets of power grid equipment linkage strategies that can be triggered by any equipment maintenance are constructed, the power grid equipment status changes are extracted from each set of power grid equipment linkage strategies, and the equipment status in the power grid logic diagram in step two is changed. Through graph theory traversal and interconnected graph solving algorithms, it is compared whether new isolated interconnected subgraphs are generated before and after the equipment status change, and the load data of the subgraph is counted to obtain the power outage range and load loss situation. The load loss situation under each set of strategies is ranked, and the multiple sets of strategies with the smallest load loss and the lower ranking are set as the minimum power outage range.

8. The method for optimally arranging the operation mode of a power grid based on the minimum power outage range according to claim 7, characterized in that: In step 5, forming the optimal load transfer strategy includes: On the basis of step 4, the power grid logic diagram is reset for multiple transfer strategies with the smallest loss load, and it is traversed upward from the terminal node in sequence. The statistics of any high-voltage main transformer, line load and equipment overload are aggregated. If the equipment load rate exceeds 80%, it is recorded. For each transfer strategy, the one with the least overloaded equipment and the lowest load rate is set as the optimal load transfer strategy.

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