Low-penetration cooperative monitoring and power supply guarantee system and method for wind farm box transformer ups

Abstract

This invention discloses a low-voltage ride-through (LDR) collaborative monitoring and power supply guarantee system and method for UPS systems in wind farm substations, belonging to the technical field of UPS systems in wind farm substations. In the system, a multi-dimensional status acquisition module collects operating status data of the UPS system and grid voltage status data of the wind farm's grid connection point; a low-voltage ride-through auxiliary decision-making module performs grid low-voltage drop judgment and drop level classification processing based on the data, generating UPS output mode adjustment commands; a battery endurance prediction module performs battery endurance capability calculation processing based on the data, generating an insufficient endurance warning signal; a remote control module issues control commands to the UPS system based on the output mode adjustment command and the insufficient endurance warning signal; and a data storage and display module is used for data storage and display. This invention can achieve collaborative monitoring and low-voltage ride-through, improve the success rate of ride-through, and provide accurate early warnings, making it suitable for different operation and maintenance scenarios in wind farms.

Description

Technical Field

[0001] This invention belongs to the field of UPS technology for wind farm substations, specifically relating to a low-voltage collaborative monitoring and power supply guarantee system and method for wind farm substation UPS. Background Technology

[0002] The UPS (Uninterruptible Power Supply) in wind farm substations is a core device ensuring uninterrupted power supply to critical equipment such as wind turbine converters and monitoring and control systems. Its operational stability directly affects the wind turbine's power generation efficiency and the safe grid connection. Currently, the UPS monitoring system in wind farm substations can achieve basic status monitoring and remote start / stop control, collecting parameters such as UPS output voltage and frequency and feeding them back to the wind farm's central control center. Meanwhile, low-voltage ride-through is a core requirement for wind turbine grid connection; when the grid voltage drops, the wind turbine must maintain grid connection and provide reactive power support.

[0003] However, currently, the coordination between UPS monitoring and low-voltage ride-through is lacking in the wind farm substations. The UPS is treated as an independent power supply device, without considering the adjustment of output characteristics under low-voltage grid conditions. This leads to unstable UPS power supply during wind turbine low-voltage ride-through, and may even trigger protection shutdowns, affecting the success rate of the ride-through. Furthermore, the monitoring system's monitoring of UPS battery status is insufficient. Under low-voltage conditions, the UPS needs continuous power supply, and the existing system cannot accurately predict battery endurance, easily resulting in battery depletion and power outages in the wind turbine control system. Remote control commands are limited, only supporting start / stop and parameter fine-tuning, and cannot dynamically adjust the UPS output mode (e.g., constant voltage output, constant power output) based on the degree of grid voltage drop. In summary, the current wind farm substation UPS monitoring system lacks coordination between grid fluctuation characteristics and low-voltage ride-through, and UPS monitoring is relatively disconnected from wind turbine grid-connected control, making it difficult for the UPS to support low-voltage ride-through. Battery endurance prediction needs further optimization. Summary of the Invention

[0004] This invention provides a low-voltage ride-through coordinated monitoring and power supply guarantee system and method for UPS in wind farm transformer substations. The purpose is to solve the problems in the current monitoring system of UPS in wind farm transformer substations, such as insufficient coordination between grid fluctuation characteristics and low-voltage ride-through, relatively disconnect between UPS monitoring and wind turbine grid connection control, which makes it difficult for UPS to provide support for low-voltage ride-through, and the need for further optimization of battery life prediction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This invention relates to a low-voltage ride-through collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS, comprising a multi-dimensional status acquisition module, a remote control module, a low-voltage ride-through auxiliary decision-making module, a battery endurance prediction module, and a data storage and display module; wherein: The output of the multi-dimensional status acquisition module is connected to the input of the low voltage ride-through auxiliary decision-making module, the battery endurance prediction module, and the data storage and display module, respectively; the outputs of the low voltage ride-through auxiliary decision-making module and the battery endurance prediction module are connected to the input of the remote control module. The multi-dimensional status acquisition module is used to collect the operating status data of the UPS body of the transformer substation and the grid voltage status data of the wind farm grid connection point; the low voltage ride-through auxiliary decision module is used to perform grid low voltage drop judgment and drop level classification processing based on the grid voltage status data, and generate corresponding UPS output mode adjustment commands; the battery endurance prediction module is used to perform battery endurance capability calculation processing based on the operating status data, and generate insufficient endurance warning signals; the remote control module is used to send control commands to the UPS body of the transformer substation based on the output mode adjustment commands and insufficient endurance warning signals; the data storage and display module is used for data storage, retrieval and visualization display.

[0006] In some implementations, the multi-dimensional status acquisition module includes a UPS status acquisition unit and a power grid status acquisition unit, and the data acquisition frequency of the multi-dimensional status acquisition module meets the requirements of the preset acquisition frequency. The UPS status acquisition unit is used to acquire the output voltage, output current, battery SOC, battery SOH, and inverter efficiency of the UPS body in the transformer substation; the grid status acquisition unit is used to acquire the voltage drop depth, drop duration, and voltage recovery rate at the wind farm grid connection point.

[0007] In some implementations, the remote control module includes a control platform, a communication unit, and an instruction execution unit. The control platform is deployed in the wind farm's central control center and supports switching between manual and automatic control modes.

[0008] Furthermore, the communication unit adopts a wind power-specific wireless communication protocol and is compatible with the IEC61400-25 communication standard; the instruction execution unit is integrated into the UPS controller of the transformer substation UPS body, and the instruction execution unit is used to execute output mode adjustment instructions and battery charging and discharging parameter optimization instructions.

[0009] In some implementations, the low voltage ride-through auxiliary decision module can classify the grid voltage drop state into mild drop, moderate drop, and severe drop according to a preset voltage threshold.

[0010] Furthermore, the UPS output modes matched by the low voltage ride-through auxiliary decision module include conventional constant voltage output mode, constant voltage reactive power compensation mode, and low power consumption constant power mode.

[0011] Furthermore, in the conventional constant voltage output mode, the output voltage fluctuation range meets the preset voltage fluctuation threshold; in the constant voltage reactive power compensation mode, the reactive current amplitude meets the preset reactive current threshold; in the low power constant power mode, the load of the transformer UPS body is powered according to the preset load priority.

[0012] In some implementations, the input data for the battery life prediction module includes battery SOC data, battery SOH data, current load power data, and predicted low voltage drop duration.

[0013] Furthermore, the battery life prediction module completes the calculation through the remaining capacity calculation model, and the output results are the sustainable power supply time of the UPS body under low voltage conditions and the warning signal of insufficient battery life.

[0014] This invention also provides a method for low-voltage collaborative monitoring and power supply protection of UPS in wind farm transformer substations, which is based on the above-mentioned low-voltage collaborative monitoring and power supply protection system for UPS in wind farm transformer substations, and includes the following steps: The multi-dimensional status acquisition module collects real-time operating status data of the transformer substation UPS and grid voltage status data of the wind farm grid connection point, and transmits the collected data to the low voltage ride-through auxiliary decision module, the battery endurance prediction module and the data storage and display module respectively. The low voltage ride-through auxiliary decision module performs low voltage drop judgment and drop level classification based on the received grid voltage status data, and generates corresponding UPS output mode adjustment instructions. The battery endurance prediction module calculates the battery endurance of the UPS body based on the received operating status data and generates an insufficient endurance warning signal. The remote control module generates corresponding control commands based on the UPS output mode adjustment command and the insufficient battery warning signal, and sends the control commands to the UPS body of the transformer substation for execution. The data storage and display module stores, retrieves, and visualizes collected data, instruction information, and process data.

[0015] Compared with the prior art, the present invention provides a low-voltage collaborative monitoring and power supply guarantee system and method for UPS in wind farm transformer substations, which has the following advantages: This invention relates to a low-voltage ride-through (LVRT) collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS. By adding a grid status acquisition unit and a low-voltage ride-through auxiliary decision module, UPS monitoring is integrated into the wind turbine LVRT process. The system dynamically adjusts the output mode to provide stable power supply and reactive power support during the ride-through process, achieving collaborative monitoring and LVRT, and improving the ride-through success rate by ≥30%. The battery endurance prediction module calculates the sustainable power supply time based on multi-dimensional data, providing early warning of insufficient endurance risks and preventing UPS power failure during LVRT that could lead to wind turbine shutdown. This invention supports automatic switching of output mode based on voltage drop levels and also allows for manual intervention via the control platform, meeting the needs of different wind farm operation and maintenance scenarios and improving the flexibility of remote management. Furthermore, this invention adopts a wind power-specific communication protocol, which has strong anti-electromagnetic interference capabilities and improves data transmission stability by approximately 50% compared to general communication protocols. It is suitable for the high wind speed and strong electromagnetic interference operating environment of wind farms and has certain engineering applicability. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the architecture of the low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substations of the present invention. Figure 2 This is a flowchart illustrating the low-voltage collaborative monitoring and power supply guarantee method for wind farm transformer substation UPS of the present invention. Figure 3 This is a schematic diagram illustrating the matching relationship between voltage drop levels and UPS output modes in the low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer UPS of the present invention. Figure 4 This is a schematic diagram of the calculation logic of the battery endurance prediction module in the low-voltage collaborative monitoring and power supply guarantee system of the wind farm transformer UPS of the present invention.

[0018] Among them, 1. Multi-dimensional status acquisition module; 11. UPS status acquisition unit; 12. Power grid status acquisition unit; 2. Remote control module; 21. Control platform; 22. Communication unit; 23. Instruction execution unit; 3. Low voltage ride-through auxiliary decision module; 4. Battery life prediction module; 5. Data storage and display module; 6. UPS body of transformer substation; 7. Wind farm grid connection point; 8. Wind farm central control center. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] It should be noted that the apparatus and methods disclosed in the embodiments herein can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings show the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments herein. In this regard, each block in a flowchart or block diagram may represent a module, program, or part of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system to perform the specified function or action, or can be implemented using a combination of dedicated hardware and computer instructions.

[0023] In addition, the functional modules in the various embodiments of this article can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0024] How to achieve coordinated monitoring of UPS operating status and grid voltage status, and assist wind turbines in completing low-voltage ride-through by dynamically adjusting UPS output mode, thereby improving the success rate of ride-through and the grid connection stability of wind farms.

[0025] like Figure 1 As shown, the low-voltage ride-through collaborative monitoring and power supply guarantee system for wind farm transformer substations of the present invention includes a multi-dimensional status acquisition module 1, a remote control module 2, a low-voltage ride-through auxiliary decision-making module 3, a battery endurance prediction module 4, and a data storage and display module 5; wherein: The output of the multi-dimensional status acquisition module 1 is connected to the input of the low voltage ride-through auxiliary decision module 3, the battery endurance prediction module 4, and the data storage and display module 5, respectively; the outputs of the low voltage ride-through auxiliary decision module 3 and the battery endurance prediction module 4 are connected to the input of the remote control module 2. The multi-dimensional status acquisition module 1 is used to collect the operating status data of the UPS body 6 of the transformer substation and the grid voltage status data of the wind farm grid connection point 7; the low voltage ride-through auxiliary decision module 3 is used to perform grid low voltage drop judgment and drop level classification processing based on the grid voltage status data, and generate corresponding UPS output mode adjustment commands; the battery endurance prediction module 4 is used to perform battery endurance capacity calculation processing based on the operating status data of the UPS body 6 of the transformer substation, and generate an insufficient endurance warning signal; the remote control module 2 is used to send control commands to the UPS body 6 of the transformer substation based on the output mode adjustment command and the insufficient endurance warning signal; the data storage and display module 5 is used for data storage, retrieval and visualization display.

[0026] This invention can simultaneously collect operating status data of the UPS body 6 in the transformer substation and grid voltage status data of the wind farm's grid connection point. Based on the low voltage ride-through auxiliary decision module 3, it completes the judgment and level classification of grid low voltage drops and generates appropriate output mode adjustment commands. Combined with the battery endurance prediction module 4, it completes the calculation of battery endurance and generates early warning signals. Then, through the remote control module 2, the control commands are sent to the UPS body 6 for execution, realizing the operation control of the transformer substation UPS and the low voltage ride-through of the wind turbine. It can provide relatively reliable power supply guarantee for the wind turbine in the scenario of grid voltage fluctuation, and to a certain extent, it can ensure the continuous grid-connected operation of the wind turbine. The data storage and display module 5 of this invention can complete the storage, retrieval, and visualization of operating data and control commands, providing data support for system operation and maintenance and status traceability. This invention improves the problem of existing transformer substation UPS monitoring systems being difficult to adapt to low voltage ride-through, improves the stability of power supply, optimizes the reliability of remote control, and is expected to improve the operational reliability of transformer substation UPS and the stability of wind farm grid connection.

[0027] In some operating conditions, the UPS status acquisition unit 11 and the power grid status acquisition unit 12 of the present invention carry out data acquisition work according to the preset acquisition frequency, which can realize the classified acquisition of the operating parameters of the transformer substation UPS body 6 and the power grid parameters of the wind farm grid connection point 7. The output voltage, output current, battery SOC, battery SOH and inverter efficiency acquired by the UPS status acquisition unit 11 can reflect the real-time operating status of the transformer substation UPS body 6. The voltage drop depth, drop duration and voltage recovery rate acquired by the power grid status acquisition unit 12 can reflect the dynamic change characteristics of the power grid voltage.

[0028] Furthermore, by deploying a control platform 21 in the wind farm central control center 8 and supporting the switching between manual and automatic control modes, the present invention can flexibly adapt to the needs of daily automated operation and maintenance and emergency manual intervention in wind farms. The communication unit 22 adopts a wind power-specific wireless communication protocol and is compatible with the IEC61400-25 communication standard, adapting to the field environment of strong electromagnetic interference or complex working conditions in wind farms. The command execution unit 23 can directly respond to and execute output mode adjustment and battery charging and discharging parameter optimization commands, shortening the command response and execution time.

[0029] Furthermore, this invention classifies grid voltage drops into three levels—mild, moderate, and severe—based on preset voltage thresholds, enabling graded determination of grid operating conditions. Simultaneously, it matches conventional constant voltage output mode, constant voltage reactive power compensation mode, and low-power constant power mode, allowing the UPS body 6 of the transformer substation to adaptively adjust its output state according to different grid voltage drop conditions. It performs regulation based on preset voltage fluctuation thresholds, preset reactive current thresholds, and preset load priorities, enabling it to meet the power supply and reactive power support requirements of low-voltage ride-through for wind turbines while maintaining stable power supply.

[0030] Furthermore, this invention uses battery SOC data, battery SOH data, current load power data, and predicted low voltage drop duration as input data. Through the remaining capacity calculation model, it completes the calculation and processing, which can measure the sustainable power supply time of the transformer substation UPS body 6 under low voltage conditions and output a low battery warning signal. It can identify the risk of insufficient battery power supply in advance and is expected to avoid the transformer substation UPS body 6 from power failure due to battery depletion. It provides reliable support for low voltage ride-through of wind turbines from the perspective of battery endurance guarantee.

[0031] Specifically, in some embodiments, the multi-dimensional status acquisition module 1 of the present invention is installed at the UPS body 6 of the transformer substation and the grid connection point 7 of the wind farm. It includes a UPS status acquisition unit 11 for acquiring output voltage, current, battery SOC / SOH, and inverter efficiency, and a grid status acquisition unit 12 for acquiring the voltage drop depth, drop duration, and voltage recovery rate of the grid connection point. The acquisition frequency is not less than 100Hz. The remote control module of the present invention includes a control platform 21, a communication unit 22, and an instruction execution unit 23. The control platform 21 is deployed at the wind farm central control center 8 and supports manual / automatic control mode switching. The communication unit 22 adopts a wind power-specific wireless communication protocol, compatible with IEC61400-25, to ensure signal transmission in complex wind farm environments. The instruction execution unit 23 is integrated into the UPS controller and is used to receive and execute instructions for output mode adjustment and battery charging and discharging parameter optimization.

[0032] like Figure 3 As shown, the low-voltage ride-through auxiliary decision module 3 of this invention incorporates a voltage sag level classification rule and a UPS output mode matching model. The voltage sag level classification rule is specifically as follows: mild sag: voltage ≥ 0.5 pu; moderate sag: 0.2 pu ≤ voltage < 0.5 pu; severe sag: voltage < 0.2 pu). The low-voltage ride-through auxiliary decision module 3 generates corresponding output mode adjustment commands based on the voltage data from the power grid status acquisition unit and the UPS status data.

[0033] exist Figure 3 In the diagram, the X-axis represents the grid voltage drop amplitude (pu); the Y-axis represents the UPS output power (kW) / reactive current amplitude (% of rated current); A represents the normal constant voltage output mode range; B represents the constant voltage reactive power compensation output mode range; and C represents the low power constant power output mode range. Figure 3 The system clearly defines three levels of grid voltage drop (mild, moderate, and severe), and marks the corresponding UPS output mode for each level. It also marks the core output parameter thresholds for each mode: A level (≥0.5pu) is the conventional constant voltage mode, with the output voltage fluctuation range marked as ≤±2%; B level (0.2pu≤X<0.5pu) is the constant voltage reactive power compensation mode, with the reactive current amplitude marked as ≤30% of the rated current; C level (<0.2pu) is the low-power constant power mode, with the reference value for the power reduction ratio of non-critical loads and the power supply priority of core loads marked. Figure 3 The threshold boundaries of each interval are marked with dashed lines to facilitate intuitive querying of the UPS control strategies corresponding to different drop amplitudes.

[0034] like Figure 4As shown, the hierarchical relationship between input parameters, calculation model, and output results is illustrated. The battery life prediction module 4 of this invention, based on battery SOC / SOH data, current load power, and predicted low-voltage drop duration, uses a remaining capacity calculation model to predict the battery's sustainable power supply time under low-voltage conditions and outputs a warning for insufficient battery life. Simultaneously, the data storage and display module 5 of this invention stores historical monitoring data, control commands, and data from the traversal process, supporting data visualization and historical traceability.

[0035] exist Figure 4 In the module, the input layer contains battery SOC / SOH data, current load power data, and predicted low voltage drop duration; the calculation layer is the remaining capacity calculation model, and the annotation model performs multi-dimensional coupled calculations based on the above input parameters; the output layer contains the battery's sustainable power supply time under low voltage conditions and insufficient range warning signals, while the annotation warning trigger threshold setting interface intuitively reflects the module's prediction and warning logic.

[0036] This invention also provides a method for low-voltage collaborative monitoring and power supply guarantee of UPS in wind farm transformer substations, which is carried out according to the following steps: The multi-dimensional status acquisition module 1 collects the operating status data of the transformer UPS body 6 and the grid voltage status data of the wind farm grid connection point 7 in real time, and transmits the collected data to the low voltage ride-through auxiliary decision module 3, the battery endurance prediction module 4 and the data storage and display module 5 respectively. The low voltage ride-through auxiliary decision module 3 performs low voltage drop judgment and drop level classification based on the received grid voltage status data, and generates corresponding UPS output mode adjustment instructions. The battery endurance prediction module 4 calculates the battery endurance of the UPS body 6 based on the received operating status data and generates an insufficient endurance warning signal. The remote control module 2 generates corresponding control commands based on the UPS output mode adjustment command and the insufficient battery warning signal, and sends the control commands to the UPS body 6 of the transformer substation for execution. The data storage and display module 5 stores, retrieves, and visualizes the collected data, instruction information, and process data.

[0037] like Figure 2 As shown, in some embodiments, the present invention provides a low-voltage collaborative monitoring and power supply guarantee method for wind farm transformer substation UPS: Step 1: The multi-dimensional status acquisition module 2 collects the operating status data of the transformer substation UPS body 6 and the grid voltage data at the grid connection point in real time, and uploads it to the low voltage ride-through auxiliary decision module 3. Step 2: After receiving the data, the low voltage ride-through auxiliary decision module 3 determines whether a low voltage drop has occurred in the power grid: if no drop has occurred, the UPS maintains the normal constant voltage output mode; if a drop has occurred, the drop level is classified according to the depth of the voltage drop. Step 3: Match the corresponding UPS output mode for different drop levels: For mild drops, maintain constant voltage output and adjust the output voltage fluctuation range to ≤±2% to ensure stable power supply to the wind turbine monitoring and control system; for moderate drops, switch to constant voltage reactive power compensation mode, the UPS output reactive current supports the recovery of grid voltage, and the reactive current amplitude is ≤30% of the rated current; for severe drops, switch to low power constant power mode, reduce the power supply to non-critical loads, prioritize the power supply to the core components of the converter, and at the same time, the battery life prediction module 4 calculates the sustainable power supply time. Step 4: The remote control module 2 sends the output mode adjustment command to the command execution unit through the communication unit, and the UPS execution mode is switched; Step 5: During the process, the multi-dimensional status acquisition module 1 continuously monitors the voltage recovery and UPS status. If the voltage recovers to ≥0.9pu, the UPS gradually switches back to normal mode. If the battery life is insufficient and a warning is triggered, the remote control module 2 issues a load priority adjustment command to ensure that the core equipment is powered until the voltage is restored. Step 6: After the traversal is completed, the data storage and display module 5 records all the data for subsequent analysis and optimization.

[0038] In summary, this invention provides a low-voltage ride-through collaborative monitoring and power supply guarantee system for wind farm transformer substations. It includes a grid status acquisition unit and a low-voltage ride-through auxiliary decision-making module adapted to low-voltage ride-through scenarios; a dynamic switching method for UPS output modes based on voltage drop levels, with output modes including conventional constant voltage mode, constant voltage reactive power compensation mode, and low-power constant power mode. Furthermore, this invention integrates a battery life prediction model based on battery SOC / SOH, load power, and drop duration for calculating and providing early warnings of UPS continuous power supply time under low-voltage conditions. Remote control via a wind power-specific communication protocol enables data transmission and command issuance even in complex wind farm environments, demonstrating significant engineering practical value.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Anyone skilled in the art can readily implement the present invention according to the description and above. Any modifications, alterations, or equivalent variations made using the technical content disclosed above are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A low-voltage collaborative monitoring and power supply guarantee system for UPS systems in wind farm transformer substations, characterized in that, It includes a multi-dimensional status acquisition module (1), a remote control module (2), a low-voltage ride-through auxiliary decision-making module (3), a battery endurance prediction module (4), and a data storage and display module (5); among which: The output of the multi-dimensional state acquisition module (1) is connected to the input of the low voltage ride-through auxiliary decision module (3), the battery endurance prediction module (4), and the data storage and display module (5), respectively; the output of the low voltage ride-through auxiliary decision module (3) and the battery endurance prediction module (4) is connected to the input of the remote control module (2); The multi-dimensional status acquisition module (1) is used to acquire the operating status data of the transformer substation UPS body (6) and the grid voltage status data of the wind farm grid connection point (7); the low voltage ride-through auxiliary decision module (3) is used to perform grid low voltage drop judgment and drop level classification processing based on the grid voltage status data, and generate corresponding UPS output mode adjustment instructions; the battery endurance prediction module (4) is used to perform battery endurance capacity calculation processing of the transformer substation UPS body (6) based on the operating status data, and generate an insufficient endurance warning signal; the remote control module (2) is used to send control instructions to the transformer substation UPS body (6) based on the output mode adjustment instructions and the insufficient endurance warning signal; the data storage and display module (5) is used for data storage, retrieval and visualization display.

2. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 1, characterized in that, The multi-dimensional status acquisition module (1) includes a UPS status acquisition unit (11) and a power grid status acquisition unit (12). The data acquisition frequency of the multi-dimensional status acquisition module (1) meets the requirements of the preset acquisition frequency. The UPS status acquisition unit (11) is used to acquire the output voltage, output current, battery SOC, battery SOH and inverter efficiency of the UPS body (6) of the transformer substation; the grid status acquisition unit (12) is used to acquire the voltage drop depth, drop duration and voltage recovery rate of the wind farm grid connection point (7).

3. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 1, characterized in that, The remote control module (2) includes a control platform (21), a communication unit (22) and an instruction execution unit (23). The control platform (21) is deployed in the wind farm central control center (8). The control platform (21) supports switching between manual control mode and automatic control mode.

4. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 3, characterized in that, The communication unit (22) adopts a wind power-specific wireless communication protocol and is compatible with the IEC61400-25 communication standard. The instruction execution unit (23) is integrated into the UPS controller of the transformer substation UPS body (6). The instruction execution unit (23) is used to execute output mode adjustment instructions and battery charging and discharging parameter optimization instructions.

5. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 1, characterized in that, The low voltage ride-through auxiliary decision module (3) can classify the grid voltage drop state into mild drop, moderate drop and severe drop according to the preset voltage threshold.

6. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 5, characterized in that, The UPS output modes matched by the low voltage ride-through auxiliary decision module (3) include conventional constant voltage output mode, constant voltage reactive power compensation mode and low power consumption constant power mode.

7. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 6, characterized in that, In the normal constant voltage output mode, the output voltage fluctuation range meets the preset voltage fluctuation threshold; in the constant voltage reactive power compensation mode, the reactive current amplitude meets the preset reactive current threshold; in the low power constant power mode, the load of the transformer UPS body (6) is powered according to the preset load priority.

8. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 1, characterized in that, The input data of the battery life prediction module (4) includes battery SOC data, battery SOH data, current load power data, and predicted value of low voltage drop duration.

9. The low-voltage collaborative monitoring and power supply guarantee system for wind farm transformer substation UPS according to claim 8, characterized in that, The battery life prediction module (4) completes the calculation through the remaining capacity calculation model and outputs the sustainable power supply time and insufficient power supply warning signal of the UPS body (6) under low voltage conditions.

10. A method for low-voltage collaborative monitoring and power supply protection of UPS in wind farm transformer substations, based on the low-voltage collaborative monitoring and power supply protection system for UPS in wind farm transformer substations as described in any one of claims 1-9, characterized in that, Includes the following steps: The multi-dimensional status acquisition module (1) collects the operating status data of the transformer UPS body (6) and the grid voltage status data of the wind farm grid connection point (7) in real time, and transmits the collected data to the low voltage ride-through auxiliary decision module (3), the battery endurance prediction module (4) and the data storage and display module (5). The low voltage ride-through auxiliary decision module (3) performs low voltage drop judgment and drop level classification based on the received grid voltage status data, and generates corresponding UPS output mode adjustment instructions. The battery endurance prediction module (4) calculates the battery endurance of the UPS body (6) based on the received operating status data and generates an insufficient endurance warning signal. The remote control module (2) generates corresponding control commands based on the UPS output mode adjustment command and the insufficient battery warning signal, and sends the control commands to the transformer substation UPS body (6) for execution. The data storage and display module (5) stores, retrieves, and visualizes the collected data, instruction information, and process data.

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