Coal mine power supply network emergency recovery method and equipment

Abstract

The present invention relates to the technical field of safe power supply of electric power systems, and in particular to a method and device for emergency recovery of a coal mine power supply network, which aims to avoid secondary tripping. The method for emergency recovery of a coal mine power supply network of the present invention comprises: constructing a topological structure diagram of the power supply network, marking the hierarchical relationship of the power supply equipment; obtaining the electrical parameters of each switch circuit in the power supply network in real time through the SCADA system; in the event of a tripping phenomenon, locating the upper power supply equipment that has not triggered the protection action according to the topological structure diagram, and calculating the load rate of the upper power supply equipment according to the electrical parameters; when the load rate is less than or equal to the safety threshold, starting the lower-level equipment of the upper power supply equipment in sequence according to the topological structure diagram, and dynamically updating the start-up interval time. The present invention can avoid instantaneous overload during the recovery process, thereby avoiding the occurrence of secondary tripping.

Description

Technical Field

[0001] The present invention relates to the technical field of safe power supply of power systems, and in particular to a method and equipment for emergency recovery of a coal mine power supply network. Background Art

[0002] Coal mine power supply systems face numerous challenges due to the complex underground environment, the presence of flammable and explosive substances such as gas and dust, the complex tunnel structures, and the long, branching power lines. Common faults such as equipment aging, overload, and short circuits, as well as factors such as natural disasters and human error, can easily lead to widespread power outages. Once such an incident occurs, a ventilation system outage can lead to gas accumulation and deteriorating air quality, threatening the lives of miners. A malfunctioning drainage system can cause flooding in the mine, damage equipment, and potentially cause tunnel collapses. Monitoring and communication systems can also be disrupted, resulting in a loss of information between the mine and underground, severely hindering emergency response and production control. Therefore, quickly restoring power after a widespread power outage in a coal mine is crucial.

[0003] Traditional emergency power transmission routing relies primarily on human experience, with dispatchers manually developing power transmission plans based on grid topology, equipment status, and fault information. However, this approach struggles to detect potential risks and automatically interrupt power supply. This can lead to secondary tripping, masking the initial fault characteristics, making troubleshooting more difficult, and delaying resolution. Summary of the Invention

[0004] In order to solve the above problems in the prior art, the present invention proposes a coal mine power supply network emergency recovery method and equipment, which can effectively avoid the occurrence of secondary tripping.

[0005] A first aspect of the present invention provides a method for emergency restoration of a coal mine power supply network, the method comprising:

[0006] Construct a topological diagram of the power supply network and mark the hierarchical relationship of power supply equipment;

[0007] Acquiring electrical parameters of each switch circuit in the power supply network in real time through a SCADA (Supervisory Control and Data Acquisition) system; the electrical parameters include current and voltage;

[0008] In the event of a tripping phenomenon, locating the upper-level power supply equipment that has not triggered the protection action according to the topological structure diagram, and calculating the load rate of the upper-level power supply equipment according to the electrical parameters;

[0009] When the load rate is less than or equal to the safety threshold, the subordinate devices of the superior power supply device are started in sequence according to the topology diagram, and the start-up interval is dynamically updated.

[0010] Preferably, the step of "in the event of a tripping phenomenon, locating the upper-level power supply equipment closest to the upstream of the fault according to the topological structure diagram, and calculating the load rate of the upper-level power supply equipment according to the electrical parameters" includes:

[0011] In the event of a trip, start from the tripped switch and search upstream along the topology diagram until the upstream power supply equipment that has not triggered the protection action is found;

[0012] The used power and safety capacity of the upper-level power supply device are calculated based on the electrical parameters, and then the load rate of the upper-level power supply device is calculated.

[0013] Preferably, the step of “calculating the used power and safety capacity of the upper-level power supply device according to the electrical parameters, and then calculating the load rate of the upper-level power supply device” includes:

[0014] Calculate the used power of the upper power supply device according to the electrical parameters :

[0015] ;

[0016] in, Respectively represent the first The current and voltage of the unde-energized branch, The total number of unpowered branches of the upper-level power supply equipment;

[0017] Calculate the safety capacity of the upper power supply equipment according to the rated capacity of the upper power supply equipment and the preset derating factor :

[0018] ;

[0019] in, k is the preset derating factor, is the rated capacity of the upper-level power supply equipment;

[0020] Calculate the load rate of the upper-level power supply device based on the used power and the safety capacity:

[0021] .

[0022] Preferably, the step of “starting the subordinate devices of the upper power supply device in sequence according to the topology diagram when the load rate is less than or equal to the safety threshold, and dynamically updating the startup interval time” includes:

[0023] If the load rate is less than or equal to the safety threshold, the startup interval is calculated based on the load rate and the preset basic interval. :

[0024] ;

[0025] in, is the preset basic interval time, is the load rate;

[0026] According to the topology diagram, starting a lower-level device of the upper-level power supply device according to the start-up interval, and recalculating the load rate and the start-up interval according to the electrical parameters obtained in real time;

[0027] If the load rate exceeds a preset load rate threshold, the startup is suspended and an alarm is issued; otherwise, the steps of starting the lower-level device and calculating the load rate and the startup interval are repeated until all power supply devices are restored.

[0028] Preferably, the method further comprises:

[0029] Build a database for storing device parameters;

[0030] The equipment parameters include: rated capacity, voltage level and topology relationship of power supply equipment at each level.

[0031] Preferably, a depth-first search algorithm is used to locate the upper-level power supply equipment that has not triggered a protection action.

[0032] Preferably, the method further comprises:

[0033] The trip position, the load rate, the start interval time, the recovery progress and the timestamp are recorded in real time and displayed visually to support manual intervention operations.

[0034] According to a second aspect of the present invention, an electronic device is provided, comprising a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute the method described above.

[0035] According to a third aspect of the present invention, a computer-readable storage device is provided, storing a computer program that can be loaded by a processor and execute the method described above.

[0036] The present invention has the following beneficial effects:

[0037] When the load rate is less than or equal to the safety threshold, the lower-level devices are started in sequence and the start interval is dynamically updated to avoid instantaneous overload during the recovery process, thereby avoiding the occurrence of secondary tripping.

[0038] By introducing the load rate into the calculation formula of the start-up interval time, the start-up interval time can be gradually increased as the load rate of the power supply equipment increases during the recovery process, thereby minimizing the impact of the instantaneous current shock of the newly started equipment on the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the main steps of an embodiment of the coal mine power supply network emergency recovery method of the present invention;

[0040] Figure 2 It is a schematic diagram of the topological structure associated with the trip switch in the case of the present invention. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0043] It should be noted that, in the description of the present invention, the terms "first" and "second" are merely for the convenience of description, and do not indicate or imply the relative importance of the devices, elements or parameters, and therefore should not be understood as limiting the present invention. In addition, the term "and / or" in the present invention is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document, unless otherwise specified, generally indicates that the associated objects are in an "or" relationship.

[0044] Figure 1 This is a schematic diagram of the main steps of the embodiment of the coal mine power supply network emergency recovery method of the present invention. Figure 1 As shown, the recovery method of this embodiment includes:

[0045] Step S10: construct a topological structure diagram of the power supply network and mark the hierarchical relationship of the power supply equipment.

[0046] Step S20: obtaining electrical parameters of each switch circuit in the power supply network in real time through the SCADA system.

[0047] Among them, electrical parameters include: current and voltage.

[0048] SCADA (Supervisory Control and Data Acquisition) is the core platform for the intelligentization of coal mine power supply networks. Its design must take into account special requirements such as real-time performance, reliability, and explosion-proof safety.

[0049] Step S30: When a tripping phenomenon occurs, locate the upper-level power supply equipment that has not triggered the protection action according to the topological structure diagram, and calculate the load rate of the upper-level power supply equipment according to the electrical parameters.

[0050] The upper-level power supply equipment may include: transformers, busbars or distribution cabinets, etc.

[0051] Specifically, this step may include steps S31-S32:

[0052] Step S31: When a tripping phenomenon occurs, search upstream step by step along the topology diagram starting from the tripped switch until the upper power supply equipment that has not triggered the protection action is found.

[0053] For example, a depth-first search algorithm may be used for retrieval, and it is sufficient to find the upstream power supply device that is closest to the tripping switch and has not triggered a protection action (ie, is supplying power normally).

[0054] Step S32: Calculate the used power and safety capacity of the upper-level power supply equipment according to the electrical parameters, and then calculate the load rate of the upper-level power supply equipment.

[0055] Step S32 may include steps S321-S323:

[0056] Step S321: Calculate the used power of the upper power supply equipment based on the electrical parameters (unit is kVA), as shown in formula (1):

[0057] (1)

[0058] in, Respectively represent the first The current and voltage of the unde-energized branch, The total number of unpowered branches of the upper power supply equipment.

[0059] Step S322: Calculate the safe capacity of the upper power supply equipment according to the rated capacity of the upper power supply equipment and the preset derating factor. (unit is kVA), as shown in formula (2):

[0060] (2)

[0061] in,k is the preset derating factor (taken as 0.8 in this embodiment), It is the rated capacity of the upper power supply equipment.

[0062] Because many devices in the coal mine power supply network are high-power and will generate instantaneous inrush current when starting, the preset derating factor in this embodiment is 0.8, in order to reserve a 20% buffer space for the inrush current.

[0063] Step S323: Calculate the load rate of the upper power supply equipment based on the used power and safety capacity, as shown in formula (3):

[0064] (3)

[0065] Step S40: When the load rate is less than or equal to the safety threshold (85% in this embodiment), the lower-level devices of the upper-level power supply device are started in sequence according to the topology diagram, and the start-up interval is dynamically updated.

[0066] The purpose of setting a safety threshold for the load rate is to prevent the equipment temperature from exceeding the standard (when the measured load rate is 85%, the transformer winding temperature is ≤80°C).

[0067] Specifically, this step may include steps S41-S43:

[0068] Step S41: If the load rate is less than or equal to the safety threshold, calculate the start interval time based on the load rate and the preset basic interval time. , as shown in formula (4):

[0069] (4)

[0070] in, is the preset basic interval time, is the load rate.

[0071] The basic interval time is set to balance the power transmission speed and equipment safety. The default value is 15 seconds and can be adjusted in advance according to the actual situation on site.

[0072] For example, , , then Δt=15×(1+0.8)=27 seconds.

[0073] Step S42: According to the topology diagram, a lower-level device of the upper-level power supply device is started according to the start-up interval, and the load rate and the start-up interval are recalculated according to the electrical parameters obtained in real time.

[0074] Equipment that may affect safety, such as drainage pumps and fans, can be started first.

[0075] Step S43: If the load rate exceeds the preset load rate threshold, the startup is suspended and an alarm is issued; otherwise, go to step S42 until all power supply devices are restored.

[0076] Example case:

[0077] Figure 2 This is a schematic diagram of the topological structure associated with the trip switch in the case of the present invention. Figure 2 As shown in the figure, the 1140V feeder switch K5 in a coal mine substation tripped, and its upstream equipment was transformer TR-202 .

[0078] Perform the following recovery steps:

[0079] (1) Topology analysis determined that TR-202 was the upper-level power supply equipment.

[0080] (2) Read ,calculate .

[0081] (3) Real-time calculation , and then calculate the load rate ,judge , so power transmission is allowed.

[0082] (4) Calculate the start interval time Δt = 15 × (1 + 0.75) = 26.25 seconds. In actual use, the start interval can be set to 26 seconds.

[0083] (5) Three drainage pumps (250kVA each) were started in sequence at intervals of 26 seconds, with the full load factor ≤85% and no secondary tripping was triggered.

[0084] In an optional embodiment, before step S10, the following steps may also be included:

[0085] Step S5: construct a database for storing device parameters.

[0086] Among them, equipment parameters include: rated capacity, voltage level and topology relationship of power supply equipment at all levels.

[0087] In another optional embodiment, when a tripping phenomenon occurs, a thread parallel to steps S30-S40 can be started to record the tripping position, load rate, start interval time, recovery progress and timestamp in real time, and display them visually to support manual intervention operations.

[0088] Although the various steps in the above embodiment are described in the above-mentioned order, those skilled in the art will understand that in order to achieve the effect of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reverse order. These simple changes are within the scope of protection of the present invention.

[0089] Furthermore, based on the above method embodiment, the present invention also provides an embodiment of an electronic device. The electronic device of this embodiment includes a memory and a processor, and the memory stores a computer program that can be loaded by the processor and execute the method as described above.

[0090] Furthermore, the present invention also provides an embodiment of a computer-readable storage device, in which the storage device stores a computer program that can be loaded by a processor and execute the method described above.

[0091] The computer-readable storage device may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., which can store program codes.

[0092] Those skilled in the art should be able to appreciate that the method steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of electronic hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0093] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is clearly not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent modifications or substitutions to the relevant technical features, and the technical solutions after such modifications or substitutions will fall within the scope of protection of the present invention.

Claims

1. A coal mine power supply network emergency recovery method, characterized in that: The method comprises: Construct a topological diagram of the power supply network and mark the hierarchical relationship of power supply equipment; Acquiring electrical parameters of each switch circuit in the power supply network in real time through the SCADA system; the electrical parameters include: current and voltage; In the event of a tripping phenomenon, locating the upper power supply equipment that has not triggered the protection action according to the topological structure diagram, and calculating the load rate of the upper power supply equipment according to the electrical parameters; When the load rate is less than or equal to the safety threshold, the lower-level devices of the upper-level power supply device are started in sequence according to the topology diagram, and the start-up interval is dynamically updated; in, The step of “starting the subordinate devices of the superior power supply device in sequence according to the topology diagram when the load rate is less than or equal to the safety threshold, and dynamically updating the startup interval time” includes: If the load rate is less than or equal to the safety threshold, the startup interval Δt is calculated based on the load rate and the preset basic interval time: Δt=t base ×(1+a); Among them, t base is the preset basic interval time, and α is the load rate; According to the topology diagram, starting a lower-level device of the upper-level power supply device according to the start-up interval, and recalculating the load rate and the start-up interval according to the electrical parameters obtained in real time; If the load rate exceeds a preset load rate threshold, the startup is suspended and an alarm is issued; otherwise, the steps of starting the lower-level device and calculating the load rate and the startup interval are repeated until all power supply devices are restored.

2. The coal mine power supply network emergency recovery method according to claim 1, characterized in that: The step of “locating the upper-level power supply device closest to the upstream of the fault according to the topological structure diagram in the event of a tripping phenomenon, and calculating the load rate of the upper-level power supply device according to the electrical parameters” includes: In the event of a trip, start from the tripped switch and search upstream along the topology diagram until the upstream power supply equipment that has not triggered the protection action is found; The used power and safety capacity of the upper-level power supply device are calculated based on the electrical parameters, and then the load rate of the upper-level power supply device is calculated.

3. The coal mine power supply network emergency recovery method according to claim 1, characterized in that: The step of “calculating the used power and safety capacity of the upper-level power supply device according to the electrical parameters, and then calculating the load rate of the upper-level power supply device” includes: Calculate the used power S of the upper power supply device according to the electrical parameters used : Among them, I i and V i represent the current and voltage of the i-th unpowered branch of the upper-level power supply device, respectively, and n is the total number of unpowered branches of the upper-level power supply device; The safety capacity S of the upper power supply equipment is calculated based on the rated capacity of the upper power supply equipment and the preset derating factor. safe : S safe =k×S total ; Wherein, k is the preset derating factor, S total is the rated capacity of the upper-level power supply equipment; Calculate the load rate of the upper-level power supply device based on the used power and the safety capacity:

4. The coal mine power supply network emergency recovery method according to claim 1, characterized in that: The method further comprises: Build a database for storing device parameters; The equipment parameters include: rated capacity, voltage level and topology relationship of power supply equipment at each level.

5. The coal mine power supply network emergency recovery method according to claim 1, characterized in that: A depth-first search algorithm is used to locate the upper-level power supply equipment that has not triggered the protection action.

6. The coal mine power supply network emergency recovery method according to claim 1, characterized in that: The method further comprises: The trip position, the load rate, the start interval time, the recovery progress and the timestamp are recorded in real time and displayed visually to support manual intervention operations.

7. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and execute the method according to any one of claims 1 to 6.

8. A computer-readable storage device, characterized in that: The computer program is stored and can be loaded by a processor to execute the method according to any one of claims 1 to 6.

Images