Unit grid-connected path searching method, device and equipment and storage medium

Abstract

The invention discloses a unit grid-connected path searching method, which comprises the following steps of: performing mutual exclusion pair unit set division on units, and forming a connection strategy between each unit in a mutual exclusion pair unit set and different electrified bus equipment; setting unit grid-connected constraints in the unit set by mutual exclusion, wherein the constraints comprise constraints that whether power-off units in the unit set are subjected to automatic grid-connected path searching or not and constraints that whether power-on units are subjected to grid-connected path switching or not; acquiring latest state estimation mode data, and determining unit live-line states including a power-off unit and a live-line unit; for a power-off unit under state estimation, according to unit grid-connected constraints, automatically searching a grid-connected path; and for the electrified unit under the state estimation, grid-connected path switching is carried out according to unit grid-connected constraints. The influence of mutual exclusion on a grid-connected path between units is considered, and the grid-connected path of the units is locally adjusted by combining actual experience of dispatching operation, so that load balancing of electrified bus equipment in a plant station is realized, and the rationality of a future state operation mode of a power grid is improved.

Description

Technical Field

[0001] The present invention relates to automatic control of power system dispatching, and in particular to a method, device, equipment and storage medium for searching a unit grid-connected path. Background Art

[0002] At present, when the future grid operation mode is formed by safety verification in the day ahead, the current operation mode of the synchronous grid is usually estimated based on the latest state, and the shutdown units in the current operation mode are automatically searched and the relevant switch knives are closed according to the topological connection relationship between the units and the energized busbar equipment in the grid model to put the units into operation. The related process is also called the unit grid connection path search. Under the existing method, the grid connection path searches of each generator set are independent of each other, and the mutual influence relationship cannot be considered; at the same time, there is a lack of direct interference means for the grid connection path of the non-shutdown units in the current grid operation mode in the future grid operation mode.

[0003] However, in the actual operation of the power grid, the dispatching and operating personnel need to consider the relationship between the grid-connected paths of multiple units in the same plant and station, and try to avoid the scenario where the units in the same plant and station are connected to the same live bus; and if there is a local overload or over-limit of the transmission element, it is preferred to make local adjustments to the grid-connected paths of the units in the plant and station, such as adjusting the 4 units in the current plant and station that are simultaneously connected to bus I to 2 units connected to bus I and 2 units connected to bus II, to alleviate the overload or over-limit of the transmission element. At this time, the existing solution cannot meet the above requirements. Summary of the invention

[0004] Purpose of the invention: In view of the above shortcomings, the present invention provides a load-balanced unit grid-connected path search method, device, equipment and storage medium.

[0005] Technical solution: To solve the above problems, the present invention adopts a method for searching a unit grid connection path, comprising the following steps:

[0006] The units are divided into mutually exclusive pairs of unit sets, and a connection strategy between each unit in the mutually exclusive pair of unit sets and different live bus devices is formed. The mutually exclusive pair of unit sets means that when generating the future state power grid operation mode, the units in the set must be connected to different live bus devices when they are put into operation;

[0007] Setting mutually exclusive grid-connected constraints on the units in the unit set, wherein the grid-connected constraints on the units include constraints on whether the power-off units in the unit set automatically search for grid-connected paths and constraints on whether the power-on units switch grid-connected paths;

[0008] Obtain the latest state estimation mode data to determine the power-on state of the unit, including the power-off units and the power-on units; for the power-on units under state estimation, switch the grid connection path according to the grid connection constraints of the units; according to the state after the grid connection path is switched, for the power-off units under state estimation, automatically search for the grid connection path according to the grid connection constraints of the units;

[0009] Furthermore, the mutual exclusion constraint on whether the generator sets in the set perform grid-connected path switching is specifically:

[0010] All the units in the mutually exclusive pair of units are energized. If the number of units connected to the m energized busbar equipment is C i,m If it is greater than the mean N, then randomly select C i,m -N units connected to m live bus devices switch the grid connection path and connect to live bus devices with fewer connected units than the average value N;

[0011] (2) If some of the mutually exclusive generators are not energized, we randomly select max(C i,m -N,0) units switch the grid-connected path and connect to the energized busbar equipment with less connected units than the average value N.

[0012] Furthermore,

[0013] The mutual exclusion constraint on whether the power-off units in the set of units automatically search for the grid-connected path is specifically:

[0014] (1) All units in the mutually exclusive pair of units are not powered, and all units in the mutually exclusive pair of units automatically search for grid-connected paths;

[0015] (2) In the mutually exclusive pair of units, some units are not energized. If the number of units connected to the m energized busbar equipment is C i,m Less than the mean N, then randomly select min(NC i,m ,MC i ) units that have been shut down automatically search for a grid-connected path to connect to m live bus devices, where M is the total number of units in the mutually exclusive pair set i, C i is the total number of powered units in the mutually exclusive pair unit set i.

[0016] Furthermore, the mutually exclusive pair of unit sets are maintained, and the maintenance relationship of the mutually exclusive pair of unit sets includes the mutually exclusive pair number, the mutually exclusive pair unit ID, the mutually exclusive pair unit name, and the priority grid-connected node; the grid-connected point represents the live bus equipment connected to the unit before it is put into operation; the priority grid-connected point represents the live bus equipment that is preferentially connected to the grid-connected path when all the units in the mutually exclusive pair of unit sets are out of power in the state estimation mode.

[0017] Furthermore, the latest state estimation data includes the connection relationship of each physical device in the current power grid, the switch status under the operation mode, and the energized state information of each physical device, and the physical devices include lines, transformers, units, and loads.

[0018] Furthermore, the grid-connected path is automatically searched for the outage units under state estimation. When there are multiple grid-connected paths, they are screened in combination with other maintenance equipment and unit grid-connected constraints. The screening strategies include:

[0019] (1) The grid-connected paths with maintenance equipment are not considered;

[0020] (2) Priority is given to grid-connected paths where equipment needs to be put into operation;

[0021] (3) For the determined grid connection point obtained according to the grid connection constraints of the unit, a grid connection path connected to the determined grid connection point is selected. If the corresponding grid connection path cannot be found, the unit will not be put into operation and a prompt will be given that manual maintenance is required.

[0022] The present invention also adopts a unit grid-connected path search device, comprising:

[0023] A set determination module is used to divide the units into mutually exclusive pairs of unit sets and form a connection strategy between each unit in the mutually exclusive pair of unit sets and different live bus devices. The mutually exclusive pair of unit sets means that when generating the future state power grid operation mode, the units in the set must be connected to different live bus devices when they are put into operation;

[0024] A constraint module is used to set mutually exclusive constraints on the grid connection of the units in the unit set, wherein the grid connection constraints of the units include constraints on whether the power-off units in the unit set automatically search for the grid connection path and constraints on whether the power-on units switch the grid connection path;

[0025] The execution module is used to obtain the latest state estimation data and determine the energized state of the unit, including the shut-down unit and the energized unit; for the shut-down unit under state estimation, the grid-connected path is automatically searched according to the grid-connected constraints of the unit; for the energized unit under state estimation, the grid-connected path is switched according to the grid-connected constraints of the unit.

[0026] The present invention also adopts a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0027] The present invention also adopts a computer-readable storage medium on which a computer program is stored, and the computer program implements the steps of the above method when executed by a processor.

[0028] Beneficial effect: Compared with the prior art, the significant advantage of the present invention is that it takes into account the impact of mutual exclusion on the grid-connected paths between units, and automatically adjusts the grid-connected paths of the units locally in combination with the actual experience of scheduling and operation, so as to achieve load balancing of the live bus equipment in the plant (i.e., multiple units in the plant are connected to different live bus equipment), improve the rationality of the future operation mode of the power grid, and thus improve the rationality of the day-ahead safety verification calculation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the process of the present invention.

[0030] Figure 2 It is a schematic diagram of an implementation scenario of the present invention. DETAILED DESCRIPTION

[0031] Example 1

[0032] like Figure 1 As shown, a method for searching a unit grid connection path in this embodiment includes the following steps:

[0033] Step 1: Divide the units into mutually exclusive pairs of unit sets, manually maintain the mutually exclusive pairs of unit sets, and form a connection strategy between each unit in the mutually exclusive pairs of unit sets and different live bus devices, and manually maintain a list of switches that should be opened and closed when the units switch to connect with different live bus devices in the connection strategy between each unit and different live bus devices; the mutually exclusive pairs of unit sets refer to the fact that when generating the future state power grid operation mode, the units in the set must be connected to different live bus devices when they are put into operation (this embodiment is applicable to the situation where the mutually exclusive pairs of unit sets contain an even number of units).

[0034] The specific steps are as follows:

[0035] Step 11: Manually maintain the mutually exclusive pair unit set, including the mutually exclusive pair number, mutually exclusive pair unit ID, mutually exclusive pair unit name, and priority grid connection node. The grid connection node refers to the live bus device connected to the unit when it is put into operation; the priority grid connection node means that when the mutually exclusive pair units are all out of power in the state estimation mode, the grid connection path selected by each unit when it is put into operation should be connected to the designated live bus device. The maintenance relationship of the mutually exclusive pair unit set is shown in Table 1;

[0036] Table 1 Mutually exclusive pair set relationship

[0037]

[0038] Step 12: Manual maintenance of the mutual exclusion pair of switches that should be opened and closed when the unit switches to the connection relationship with the live bus equipment. Including unit ID, unit name, path including equipment, operation, associated grid-connected nodes and other information, as shown in Table 2.

[0039] Table 2 List of grid-connected path switching devices

[0040]

[0041] Step 2: Set mutually exclusive grid-connected constraints for the units in the unit set, which include mutually exclusive constraints on whether the power-off units in the unit set automatically search for grid-connected paths and whether the power-on units switch grid-connected paths. In this embodiment, two different live bus devices are taken as an example, and the details are as follows:

[0042] Let's assume that the mutually exclusive pair is numbered i, there are 2N units in the mutually exclusive pair unit set, the unit subscript is j, and the unit ID is Gn i,j There are bus #1 and bus #2 in the station.

[0043] (1) Analyze the information of the live bus equipment connected to the mutually exclusive pair of units, and generate a list of units that need to switch to the grid-connected path and the grid-connected node information. The total number of units with live power in the mutually exclusive pair i is C i , and the number of units connected to bus #1 is C i,1 , the number of units connected to bus #2 is C i,2 .

[0044] ① All units in mutually exclusive pair i are energized, i.e. C i =2N, if C i,1 >C i,2 , then C i,1 Randomly select The station generates a list of units that need to switch the grid-connected path, and the grid-connected node information is bus #2; if C i,1 <C i,2 , then C i,2 Randomly select The station generates a list of units that need to switch the grid-connected path, and the grid-connected node information is bus #1;

[0045] ② Some of the units in the mutually exclusive pair i are not powered. i,1 >C i,2 , then C i,1 Randomly select max(C i,1 -N,0) generates a list of units that need to switch to the grid-connected path, and the grid-connected node information is bus #2; if C i,1 <C i,2 , then C i,2 Randomly select max(C i,2 -N,0) generates a list of units that need to switch the grid connection path, and the grid connection node information is bus #1; in other cases, the list of units that need to switch the grid connection path is empty. i,1-N is less than 0, indicating that there are not enough units connected to this node and additional units need to be supplemented from other places, and no switching is required.

[0046] (2) Analyze the information of the equipment connected to the energized bus of the mutually exclusive pairs of units, and update C according to the steps in (1). i,1 , C i,2 , determine the list of units for automatically searching for grid connection paths and the expected grid connection node information.

[0047] ① All units within the mutually exclusive pair i are de-energized. At this time, all units within the mutually exclusive pair need to automatically search for grid connection paths, and the grid connection node information is the same as the preferred grid connection path maintained in S1.

[0048] ② Some units within the mutually exclusive pair i are de-energized. If C i,1 < N, then randomly select min(N - C i,1 , 2N - C i,1 ) units from C i to generate a list of units that need to search for grid connection paths, and the grid connection node information is Bus #1; if C i,2 < N, then randomly select min(N - C i,2 , 2N - C i,2 ) units from C i to generate a list of units that need to search for grid connection paths, and the grid connection node information is Bus #2. In other cases, the list of units that need to search for grid connection paths is empty.

[0049] Step 3: Obtain the latest data of the state estimation for the root, including the connection relationships of various physical devices in the current power grid and the switch disconnector states under the operating mode, as well as the energized state information of physical devices such as lines / transformers / generators / loads, etc. Analyze the information of the energized bus devices connected to the mutually exclusive pairs of units under the state estimation; judge the energized states of each unit under the state estimation and adopt different strategies.

[0050] ① For the units that are stopped under the state estimation, no search needs to be carried out. Directly record that the unit is out of service, and the equipment connected to the energized bus is empty.

[0051] ② For the units that are energized under the state estimation, conduct a search within the plant where the unit is located; based on the connection relationships of the physical devices in the state estimation, find the in-plant bus devices connected to the unit. At the same time, record that the unit is in an energized state and record the energized bus devices found.

[0052] Conduct a search for the grid connection path of the units that are stopped under the state estimation. When there are multiple grid connection paths, screen them in combination with the states of other maintenance equipment and the constraints of the unit grid connection paths, and automatically put them into operation according to the selected grid connection paths. Specifically, the following principles are included:

[0053] ① If there are maintenance equipment in the path (such as switches and circuit breakers that are planned to be shut down in the future power grid operation mode), they will not be considered.

[0054] ② If there are equipment that needs to be put into operation in the path (such as switches and circuit breakers planned to be put into operation in the future power grid operation mode), priority will be given to them.

[0055] ③ If the unit with the grid-connected node has been put into operation in S2, a grid-connected path that can be connected to the specified grid-connected node is selected; if the corresponding grid-connected path cannot be found, the unit will not be put into operation and a prompt will be given that manual maintenance is required.

[0056] For the live generating units under state estimation, according to the grid-connected path constraints of the generating units, the switch list is operated according to the pre-manually maintained unit switching grid-connected path operation method to adjust the connection relationship between the generating units and the live bus equipment.

[0057] Example 2

[0058] In this embodiment, a unit grid-connected path search device includes:

[0059] A set determination module is used to divide the units into mutually exclusive pairs of unit sets and form a connection strategy between each unit in the mutually exclusive pair of unit sets and different live bus devices. The mutually exclusive pair of unit sets means that when generating the future state power grid operation mode, the units in the set must be connected to different live bus devices when they are put into operation;

[0060] A constraint module is used to set mutually exclusive constraints on the grid connection of the units in the unit set, wherein the grid connection constraints of the units include constraints on whether the power-off units in the unit set automatically search for the grid connection path and constraints on whether the power-on units switch the grid connection path;

[0061] The execution module is used to obtain the latest state estimation data and determine the energized state of the unit, including the shut-down unit and the energized unit; for the shut-down unit under state estimation, the grid-connected path is automatically searched according to the grid-connected constraints of the unit; for the energized unit under state estimation, the grid-connected path is switched according to the grid-connected constraints of the unit.

[0062] Example 3

[0063] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0064] The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0065] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0066] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0067] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A method for searching a unit grid connection path, characterized in that: The following steps are involved: The units are divided into mutually exclusive pairs of unit sets, and a connection strategy between each unit in the mutually exclusive pair of unit sets and different live bus devices is formed. The mutually exclusive pair of unit sets means that when generating the future state power grid operation mode, the units in the set must be connected to different live bus devices when put into operation; Setting mutually exclusive grid-connected constraints on the units in the unit set, wherein the grid-connected constraints on the units include constraints on whether the power-off units in the unit set automatically search for grid-connected paths and constraints on whether the power-on units switch grid-connected paths; Obtain the latest state estimation data to determine the energized state of the unit, including the shut-down units and the energized units; For the units with power under state estimation, the grid connection path is switched according to the grid connection constraints of the units. According to the state after the grid connection path is switched, for the units without power under state estimation, the grid connection path is automatically searched according to the grid connection constraints of the units.

2. The method for searching the grid-connected path of a generator set according to claim 1, characterized in that: The specific constraints of the mutual exclusion on whether the generator sets in the set should switch the grid connection path are: (1) All the units in the mutually exclusive pair of units are energized. If the number of units connected to the m energized busbar equipment is C i,m If it is greater than the mean N, then randomly select C i,m -N units connected to m live bus devices switch the grid connection path and connect to live bus devices with fewer connected units than the average value N; (2) If some of the mutually exclusive generators are not energized, we randomly select max(C i,m -H,0) units switch the grid-connected path and connect to the energized busbar equipment with less connected units than the average value N.

3. The method for searching the grid-connected path of a generator set according to claim 2, characterized in that: The mutual exclusion constraint on whether the power-off units in the set of units automatically search for the grid-connected path is specifically: (1) All units in the mutually exclusive pair of units are not powered, and all units in the mutually exclusive pair of units automatically search for grid-connected paths; (2) In the mutually exclusive pair of units, some units are not energized. If the number of units connected to the m energized busbar equipment is C i,m Less than the mean N, then randomly select min(NC i,m ,MC i ) units that have been shut down automatically search for a grid-connected path to connect to m live bus devices, where M is the total number of units in the mutually exclusive pair set i, C i is the total number of powered units in the mutually exclusive pair unit set i.

4. The method for searching the grid-connected path of a generator set according to claim 3, characterized in that: The mutually exclusive pair of unit sets are maintained, and the maintenance relationship of the mutually exclusive pair of unit sets includes the mutually exclusive pair number, the mutually exclusive pair unit ID, the mutually exclusive pair unit name, and the priority grid-connected node; the grid-connected point represents the live bus equipment connected to the unit before it is put into operation; the priority grid-connected point represents the live bus equipment that is preferentially connected to the grid-connected path when each unit is put into operation when all the units in the mutually exclusive pair of unit sets are out of power in the state estimation mode.

5. The method for searching the grid-connected path of a generator set according to claim 4, characterized in that: The latest state estimation data includes the connection relationship of each physical device in the current power grid, the switch status under the operation mode, and the energized state information of each physical device. The physical devices include lines, transformers, units, and loads.

6. The method for searching the grid-connected path of a generator set according to claim 4, characterized in that: Automatically search for grid-connected paths for outage units under state estimation. When there are multiple grid-connected paths, they are screened in combination with other maintenance equipment and unit grid-connected constraints. The screening strategies include: (1) The grid-connected paths with maintenance equipment are not considered; (2) Priority is given to grid-connected paths where equipment needs to be put into operation; (3) For the determined grid connection point obtained according to the grid connection constraints of the unit, a grid connection path connected to the determined grid connection point is selected. If the corresponding grid connection path cannot be found, the unit will not be put into operation and a prompt will be given that manual maintenance is required.

7. A unit grid-connected path search device, characterized in that: include: A set determination module is used to divide the units into mutually exclusive pairs of unit sets and form a connection strategy between each unit in the mutually exclusive pair of unit sets and different live bus devices. The mutually exclusive pair of unit sets means that when generating the future state power grid operation mode, the units in the set must be connected to different live bus devices when they are put into operation; A constraint module is used to set mutually exclusive constraints on the grid connection of the units in the unit set, wherein the grid connection constraints of the units include constraints on whether the power-off units in the unit set automatically search for the grid connection path and constraints on whether the power-on units switch the grid connection path; An execution module is used to obtain the latest state estimation mode data and determine the energized state of the unit, including the shut-down unit and the energized unit; For the power-off units under state estimation, the grid-connected path is automatically searched according to the grid-connected constraints of the units; for the power-on units under state estimation, the grid-connected path is switched according to the grid-connected constraints of the units.

8. The unit grid-connected path search device according to claim 7, characterized in that: The set determination module maintains the mutually exclusive pair of unit sets, and the maintenance relationship of the mutually exclusive pair of unit sets includes the mutually exclusive pair number, the mutually exclusive pair of unit ID, the mutually exclusive pair of unit name, and the priority grid-connected node; the grid-connected point represents the live bus equipment connected to the unit before it is put into operation; the priority grid-connected point represents the live bus equipment that is preferentially connected to the grid-connected path when all the units in the mutually exclusive pair of unit sets are out of power in the state estimation mode.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

Images