Fault recognition system and fault recognition method

Abstract

The invention provides a fault identification system and a fault identification method. The system comprises a multi-port bidirectional coordination controller, an infrared thermal image processing module and a current detection module. The multi-port bidirectional coordination controller is used for acquiring electrical parameters of each node in a load side and a power supply side in real time, and the infrared thermal image processing module is used for carrying out device-level fault positioning based on the electrical parameters of each node to obtain a first fault identification result; and the current detection module is used for performing fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result. According to the method, the fault can be quickly identified and positioned without adding repeated construction, the fault diagnosis speed and precision are improved, the system operation cost is reduced, and the comprehensive operation performance of a novel power system is improved.

Description

Technical Field

[0001] This invention relates to the field of fault identification technology, and in particular to a fault identification system and a fault identification method. Background Technology

[0002] With the addition of renewable energy, the stability and resilience of power systems have received widespread attention. High proportions of new energy grid connection and power electronic device integration significantly impact the control methods, power flow distribution, and protection characteristics of petrochemical new power systems. Low inertia and weak damping characteristics greatly weaken the system's anti-interference capability, drastically reducing its transient stability. The randomness and volatility of new energy sources such as wind and solar power, the complex coupling characteristics of the system, and the vulnerability of power electronic converters make the fault characteristics of the entire system more complex, and severe faults can even cause irreversible damage to the system.

[0003] Therefore, in response to the problems of rapid development of faults in new power systems, difficulty in quickly identifying faults, and insufficient applicability to different application scenarios, there is an urgent need to design a system that can quickly and accurately identify faults in power systems. Summary of the Invention

[0004] This invention provides a fault identification system and a fault identification method to address the shortcomings of existing technologies that cannot quickly and accurately identify power system faults.

[0005] This invention provides a fault identification system, comprising:

[0006] Multi-port bidirectional coordination controller, infrared thermal image processing module, and current detection module;

[0007] The multi-port bidirectional coordination controller is used to collect electrical parameters of each node on the load side and the power supply side in real time. The infrared thermal image processing module is used to perform device-level fault location based on the electrical parameters of each node to obtain a first fault identification result. The current detection module is used to perform fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result.

[0008] According to a fault identification system provided by the present invention, the multi-port bidirectional coordination controller includes a DC output port, an AC input port, a power input / output port, and an energy storage port.

[0009] According to a fault identification system provided by the present invention, the DC output port adopts a dual closed-loop control strategy, the AC input port adopts a virtual synchronous machine control strategy, and the energy storage port adopts a dual closed-loop control strategy based on energy storage voltage regulation.

[0010] According to a fault identification system provided by the present invention, the system further includes a protection module, which is used to initiate a fault protection action based on the second fault identification result.

[0011] According to a fault identification system provided by the present invention, the step of activating a fault protection action based on the second fault identification result includes:

[0012] If the second fault identification result indicates the presence of a fault, the bus fault area is located based on the sudden change in the current sampling value of each node;

[0013] Based on the location of the bus fault area, the corresponding fault protection action is activated.

[0014] According to a fault identification system provided by the present invention, the method for locating bus fault regions based on the sudden changes in current sampling values ​​at each node includes:

[0015] If the sudden change in the current sampling value at any node is 0, the corresponding bus fault area is determined to be the area outside the bus.

[0016] If the sudden change in the current sampling value at any node is not zero, the corresponding bus fault area is determined to be the area within the bus.

[0017] The present invention also provides a fault identification method, comprising:

[0018] Real-time acquisition of electrical parameters of each node on the load side and power supply side;

[0019] Device-level fault location is performed based on the electrical parameters of each node to obtain the first fault identification result;

[0020] Based on the electrical parameters of each node and the first fault identification result, a second fault identification result is obtained.

[0021] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement any of the fault identification methods described above.

[0022] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the fault identification method as described above.

[0023] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the fault identification method as described above.

[0024] The fault identification system and method provided by this invention collect electrical parameters of each node on the load side and power supply side in real time through a multi-port bidirectional coordination controller. The infrared thermal image processing module can then perform device-level fault location based on the electrical parameters of each node to obtain a first fault identification result. The current detection module can then perform fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result. This invention can achieve rapid fault identification and location without requiring repeated construction, improving the speed and accuracy of fault diagnosis, reducing system operating costs, and improving the overall operating performance of the new power system. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the fault identification system provided by the present invention;

[0027] Figure 2 This is a flowchart illustrating the fault identification method provided by the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] To address the challenges of rapid fault development, difficulty in quick fault identification, and insufficient applicability to various application scenarios in new power systems, this invention employs a multi-port bidirectional coordinated controller to quickly identify fault points and types, adapting to the new power sources and loads of these systems. This controller connects different types and levels of power sources and loads, establishing a power grid data acquisition system and a fault information system. It provides event information and waveform data during faults, while infrared thermal image processing is used to determine the operating status of overload switches and various devices in the new power system. A current detection module divides the busbar area into internal and external fault identification zones, enabling rapid and accurate identification of system faults and providing protective switch action plans, effectively improving the speed and accuracy of fault diagnosis.

[0031] In response, the present invention provides a fault identification system. Figure 1 This is a schematic diagram of the fault identification system provided by the present invention, as shown below. Figure 1 As shown, the system includes:

[0032] Multi-port bidirectional coordination controller 110, infrared thermal image processing module 120 and current detection module 130;

[0033] The multi-port bidirectional coordination controller 110 is used to collect electrical parameters of each node on the load side and the power supply side in real time. The infrared thermal image processing module 120 is used to perform device-level fault location based on the electrical parameters of each node to obtain a first fault identification result. The current detection module 130 is used to perform fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result.

[0034] Specifically, the multi-port bidirectional coordination controller 110 is used to collect electrical parameters of each node on the load side and the power supply side in real time. The electrical parameters of each node may include parameters such as voltage and current of each node. The load side may include DC load side and AC load side, and the power supply side may include grid side, photovoltaic side, wind power side, energy storage side, etc.

[0035] Furthermore, the multi-port bidirectional coordination controller 110 monitors the electrical parameters of each node on the load side and the power supply side in real time, thereby enabling the adjustment of the power supply side parameters based on the electrical parameters of the load side, and the adjustment of the load side parameters based on the electrical parameters of the power supply side, thus achieving bidirectional energy flow.

[0036] The infrared thermal image processing module 120 primarily utilizes infrared thermal imaging technology to locate device-level faults based on the electrical parameters of each node, obtaining a first fault identification result. This first fault identification result is used to locate potentially faulty devices, providing clues for further fault diagnosis. Specifically, the infrared thermal image processing module 120 mainly determines the operating status of overload switches and various devices in the new power system.

[0037] The current detection module 130 performs fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result. In other words, the current detection module monitors the electrical parameters of each node (such as current changes and characteristics), combines this with the previous first fault identification result, further confirms the specific type and location of the fault, and finally obtains the second fault identification result. That is, the first fault identification result can be understood as the initial fault identification result, and the second fault identification result can be understood as a refined identification result obtained through further fault diagnosis based on the first fault identification result. In other words, after the infrared thermal image processing module 120 has completed its detection, the current detection module 130 uses the sudden change characteristics of the current after the fault to divide the internal and external fault identification zones of the busbar area, quickly and accurately identifying system faults.

[0038] This invention enables rapid fault identification and location without requiring repetitive construction, improving the speed and accuracy of fault diagnosis, reducing system operating costs, and enhancing the overall performance of the new power system. Furthermore, this invention improves the productivity of refining and chemical enterprises, increases the availability of power equipment, and enhances the power supply capacity of the facilities. In other words, this invention can be applied to the design, operation, and management of new power systems in refining and chemical enterprises, microgrid fault diagnosis and protection applications, and comprehensive modern management of enterprise equipment operation and maintenance.

[0039] Based on the above embodiments, the multi-port bidirectional coordination controller 110 includes a DC output port (DC / DC), an AC input port (AC / AC), a power input / output port (AC / DC, DC / AC), and an energy storage port (DC / DC).

[0040] Specifically, the DC output port (DC / DC) is used to output DC power. The AC input port (AC / AC) is used to receive AC power and output AC power. The power input / output ports (AC / DC, DC / AC) are used to connect to external power sources and perform AC and DC power input / output conversion. The energy storage port (DC / DC) is used to connect energy storage devices to store electrical energy or perform DC power conversion. In other words, the integrated multi-port design of the multi-port bidirectional coordinated controller 110 can promote the coordinated operation of "source-grid-load-storage" systems and quickly resolve various faults such as short circuits, open circuits, and low-voltage ride-throughs occurring in the power grid and the controller itself.

[0041] In addition, the multi-port bidirectional coordination controller 110 can flexibly connect to renewable energy sources (such as photovoltaics, wind power, etc.), DC loads and AC loads, and establish a power grid data acquisition system and a fault information system to provide event information and waveform data during faults.

[0042] Based on any of the above embodiments, the DC output port adopts a dual closed-loop control strategy, the AC input port adopts a virtual synchronous machine control strategy, and the energy storage port adopts a dual closed-loop control strategy based on energy storage voltage regulation.

[0043] Specifically, the multi-port bidirectional coordinated controller 110 employs different control strategies for each port. The DC output port uses a dual-closed-loop control strategy, which typically involves using two feedback loops at the output port to achieve more stable output voltage or current control. The AC input port uses a virtual synchronous machine control strategy, a control strategy that simulates the behavior of a synchronous generator to achieve stable operation and output of the AC input port. The energy storage port uses a dual-closed-loop control strategy based on energy storage voltage regulation. This strategy combines energy storage technology and dual-closed-loop control, aiming to achieve stable voltage output and effective energy storage management at the energy storage port.

[0044] In this embodiment of the invention, the multi-port bidirectional coordination controller 110 adopts different control strategies for different ports, thereby better meeting the needs of different ports and realizing efficient conversion and management of electrical energy, ultimately achieving power balance.

[0045] Based on any of the above embodiments, the system further includes a protection module 140, which is used to initiate a fault protection action based on the second fault identification result.

[0046] Specifically, the protection module 140 is used to initiate fault protection actions based on the second fault identification result, thereby ensuring that the system can respond promptly when a fault is detected and take corresponding protective measures to prevent the fault from escalating or causing more serious damage to the system. The function of the protection module is to monitor the system status, identify potential faults, and trigger appropriate protection actions according to the second fault identification result, thereby ensuring the stable operation and safety of the entire system.

[0047] Based on any of the above embodiments, and based on the second fault identification result, a fault protection action is initiated, including:

[0048] If the second fault identification result indicates the presence of a fault, the bus fault area is located based on the sudden change in the current sampling value of each node.

[0049] Based on the location of the bus fault area, the corresponding fault protection action is activated.

[0050] Specifically, when the second fault identification result indicates the presence of a fault, the current sampling values ​​of each node are used to calculate the abrupt change, which is then used to locate the fault area on the busbar. The abrupt change refers to a significant change in a physical quantity (such as current) that occurs within a short period of time.

[0051] After identifying the busbar fault area, the protection module 140 initiates the corresponding fault protection action to limit the impact of the fault and ensure the safe operation of the system. Fault protection actions may include circuit disconnection, tripping, or other measures to prevent the fault from escalating and minimize its impact on the system.

[0052] Here, the operating characteristics of the current during normal operation are characterized by a constant y. r The operating characteristics of the current during a fault are as follows: w The value is determined by the fault current and the intersection, specifically expressed as:

[0053]

[0054] In the formula, I is the current amplitude, I A I B θ A θ B These represent the positive sequence current amplitude, negative sequence current amplitude, positive sequence current phase angle, and negative sequence current phase angle after the fault, respectively.

[0055] Based on any of the above embodiments, locating the bus fault region based on the sudden change in the current sampling value of each node includes:

[0056] If the sudden change in the current sampling value at any node is 0, the corresponding bus fault area is determined to be the area outside the bus.

[0057] If the sudden change in the current sampling value at any node is not zero, the corresponding bus fault area is determined to be the area within the bus.

[0058] Specifically, when the sudden change in the current sampling value of any node is 0, the corresponding bus fault area is determined to be outside the bus, that is, the fault point is located outside the conductor or equipment connected to that node.

[0059] When the sudden change in the current sampling value of any node is not 0, the corresponding bus fault area is determined to be the area within the bus, which means that the fault point is located within the conductor or equipment connected to that node.

[0060] The fault identification method provided by the present invention is described below. The fault identification method described below can be referred to in correspondence with the fault identification system described above.

[0061] Based on any of the above embodiments Figure 2 This is a flowchart illustrating the fault identification method provided by the present invention, as shown below. Figure 2 As shown, the method includes:

[0062] Step 210: Real-time acquisition of electrical parameters of each node on the load side and power supply side;

[0063] Step 220: Perform device-level fault location based on the electrical parameters of each node to obtain the first fault identification result;

[0064] Step 230: Based on the electrical parameters of each node and the first fault identification result, perform fault diagnosis to obtain the second fault identification result.

[0065] Specifically, the electrical parameters of each node can include parameters such as voltage and current of each node. The load side can include DC load side and AC load side, and the power supply side can include grid side, photovoltaic side, wind power side, energy storage side, etc.

[0066] Furthermore, infrared thermal imaging technology is used to locate device-level faults based on the electrical parameters of each node, resulting in a first fault identification result. This first fault identification result is used to locate potentially faulty devices, providing clues for further fault diagnosis.

[0067] Based on the electrical parameters of each node and the first fault identification result, a second fault identification result is obtained through fault diagnosis. In other words, by monitoring the electrical parameters of each node (such as changes and characteristics of current) and combining them with the previous first fault identification result, the specific type and location of the fault are further confirmed, ultimately yielding the second fault identification result. In other words, the first fault identification result can be understood as the initial fault identification result, and the second fault identification result can be understood as a refined identification result obtained through further fault diagnosis based on the first fault identification result.

[0068] This invention enables rapid fault identification and location without requiring repetitive construction, improving the speed and accuracy of fault diagnosis, reducing system operating costs, and enhancing the overall performance of the new power system. Furthermore, this invention improves the productivity of refining and chemical enterprises, increases the availability of power equipment, and enhances the power supply capacity of the facilities. In other words, this invention can be applied to the design, operation, and management of new power systems in refining and chemical enterprises, microgrid fault diagnosis and protection applications, and comprehensive modern management of enterprise equipment operation and maintenance.

[0069] Figure 3 This is a schematic diagram of the structure of the electronic device provided by the present invention, such as... Figure 3As shown, the electronic device may include a processor 310, a memory 320, a communication interface 330, and a communication bus 340. The processor 310, memory 320, and communication interface 330 communicate with each other via the communication bus 340. The processor 310 can call logic instructions in the memory 320 to execute a fault identification method. This method includes a multi-port bidirectional coordination controller, an infrared thermal image processing module, and a current detection module. The multi-port bidirectional coordination controller is used to collect electrical parameters of each node on the load side and power supply side in real time. The infrared thermal image processing module is used to perform device-level fault location based on the electrical parameters of each node to obtain a first fault identification result. The current detection module is used to perform fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result.

[0070] Furthermore, the logical instructions in the aforementioned memory 320 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0071] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein when the program instructions are executed by a computer, the computer is able to execute the fault identification method provided by the above methods, the method comprising: a multi-port bidirectional coordination controller, an infrared thermal image processing module, and a current detection module; the multi-port bidirectional coordination controller is used to collect electrical parameters of each node on the load side and the power supply side in real time, the infrared thermal image processing module is used to perform device-level fault location based on the electrical parameters of each node to obtain a first fault identification result, and the current detection module is used to perform fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result.

[0072] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, is implemented to perform the fault identification methods provided above. The method includes: a multi-port bidirectional coordination controller, an infrared thermal image processing module, and a current detection module; the multi-port bidirectional coordination controller is used to collect electrical parameters of each node on the load side and the power supply side in real time; the infrared thermal image processing module is used to perform device-level fault location based on the electrical parameters of each node to obtain a first fault identification result; and the current detection module is used to perform fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result.

[0073] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0074] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fault identification system, characterized in that, include: Multi-port bidirectional coordination controller, infrared thermal image processing module, and current detection module; The multi-port bidirectional coordination controller is used to collect electrical parameters of each node on the load side and the power supply side in real time. The infrared thermal image processing module is used to perform device-level fault location based on the electrical parameters of each node to obtain a first fault identification result. The current detection module is used to perform fault diagnosis based on the electrical parameters of each node and the first fault identification result to obtain a second fault identification result.

2. The fault identification system according to claim 1, characterized in that, The multi-port bidirectional coordinated controller includes a DC output port, an AC input port, a power input / output port, and an energy storage port.

3. The fault identification system according to claim 2, characterized in that, The DC output port adopts a dual closed-loop control strategy, the AC input port adopts a virtual synchronous machine control strategy, and the energy storage port adopts a dual closed-loop control strategy based on energy storage voltage regulation.

4. The fault identification system according to any one of claims 1 to 3, characterized in that, The system also includes a protection module, which is used to initiate fault protection actions based on the second fault identification result.

5. The fault identification system according to claim 4, characterized in that, The step of initiating fault protection actions based on the second fault identification result includes: If the second fault identification result indicates the presence of a fault, the bus fault area is located based on the sudden change in the current sampling value of each node; Based on the location of the bus fault area, the corresponding fault protection action is activated.

6. The fault identification system according to claim 5, characterized in that, The method of locating the bus fault area based on the sudden change in current sampling values ​​at each node includes: If the sudden change in the current sampling value at any node is 0, the corresponding bus fault area is determined to be the area outside the bus. If the sudden change in the current sampling value at any node is not zero, the corresponding bus fault area is determined to be the area within the bus.

7. A fault identification method, characterized in that, include: Real-time acquisition of electrical parameters of each node on the load side and power supply side; Device-level fault location is performed based on the electrical parameters of each node to obtain the first fault identification result; Based on the electrical parameters of each node and the first fault identification result, a second fault identification result is obtained.

8. An electronic 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, it implements the fault identification method as described in claim 7.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the fault identification method as described in claim 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the fault identification method as described in claim 7.

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