A backup power supply health status diagnosis control method, system, device and medium

Abstract

The present invention discloses a backup power supply health status diagnosis control method, system, equipment and medium, and relates to the field of wind turbine control technology. The method includes the following steps: S1, real-time monitoring of the detection instructions of the backup power supply during the normal operation of the variable pitch system, wherein the detection instructions include external detection instructions and self-detection instructions; S2, when the variable pitch system receives the detection instructions, it triggers the blade detection condition, starts to monitor the system parameters of the variable pitch system, and calculates the real-time output of the backup power supply; S3, based on the monitored system parameters and calculation results, evaluates the health diagnosis type and battery health of the backup power supply, and issues control instructions for the variable pitch system. The present invention adopts the method of blade dynamic operation detection to more directly and effectively evaluate the health of the backup power supply of the variable pitch system, which can effectively ensure the safety of the wind turbine in the case of abnormal power supply, and make the detection more accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine control, and in particular to a backup power supply health status diagnosis and control method, system, equipment and medium. Background Art

[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate and finally outputs alternating current. A wind turbine generally consists of a wind wheel, a generator, a tower, a speed limit safety mechanism, and an energy storage device.

[0003] As an important control and protection device for wind turbines, the variable pitch system plays an important role in controlling blades and capturing wind energy. When a wind turbine fails, the variable pitch system is required to control the blades to retract to a safe position to achieve air braking, which is the most critical safety line of the wind turbine. When the power supply of the power grid is abnormal, the variable pitch system needs to use the system's own backup power supply to provide energy to achieve the retraction function. At present, with the rapid development of the wind power industry, the variable pitch system, as an important component of wind turbines, has received widespread attention for the reliability and stability of its backup power supply.

[0004] At present, the backup power supply of the variable pitch system based on lead-acid batteries is a widely used solution in the industry. Lead-acid batteries play an important role in the backup power supply of the variable pitch system. Their stability, reliability and relatively low cost make them the preferred power source in the wind power field. However, lead-acid batteries also have some problems, such as low energy density, slow charging speed, and limited life. These problems have a certain impact on the long-term use of lead-acid batteries in the backup power supply of the variable pitch system.

[0005] In order to solve the problem of monitoring the status of the backup power supply of the pitch system, the battery management system is introduced into the charging and discharging process of the lead-acid battery. The battery management system can monitor various parameters of the battery in real time to ensure that it works within a safe range. The battery management system can effectively control the charging and discharging process of the lead-acid battery to avoid overcharging and over-discharging, thereby extending the battery life.

[0006] The status monitoring methods of the lead-acid battery in the pitch system mainly include voltage monitoring, current monitoring, temperature monitoring, and internal resistance monitoring. Such monitoring methods can provide certain reference information for the status monitoring of lead-acid batteries, but each method has its limitations and cannot fully and accurately reflect the health status of the battery, resulting in poor detection accuracy. A single static voltage cannot effectively judge the charge state and health status of the battery.

[0007] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0008] Based on this, it is necessary to provide a backup power supply health status diagnosis control method, system, device and medium to address the above technical problems.

[0009] In a first aspect, the present invention provides a backup power supply health status diagnosis and control method, the method comprising the following steps:

[0010] S1. Real-time monitoring of detection instructions of the backup power supply during the normal operation of the pitch control system, wherein the detection instructions include external detection instructions and self-detection instructions;

[0011] S2. When the pitch control system receives the detection command, it triggers the blade detection condition, starts monitoring the system parameters of the pitch control system, and calculates the real-time output of the backup power supply;

[0012] S3. Based on the monitored system parameters and calculation results, the health diagnosis type and battery health of the backup power supply are evaluated, and control instructions for the variable pitch system are issued.

[0013] Furthermore, the detection instructions for real-time monitoring of the backup power supply during normal operation of the pitch control system include the following steps:

[0014] S11. During the operation of the pitch control system, real-time monitoring of external detection instructions initiated by the main control;

[0015] S12. Monitor the operating status of the variable pitch system in real time during operation. If the operating status meets the fault triggering condition, the variable pitch system initiates a self-detection command.

[0016] Furthermore, the fault triggering conditions include abnormal main power fault, abnormal backup power fault, main control instructions and manual pitch control instructions.

[0017] Further, when the pitch control system receives the detection instruction, the blade detection condition is triggered, the system parameters of the pitch control system are monitored, and the real-time output of the backup power supply is calculated, including the following steps:

[0018] S21, based on the detection instruction received by the pitch control system, when the blade runs to the detection start angle, disconnect the main power supply of the pitch control system, and only start the backup power supply;

[0019] S22, real-time monitoring of system parameters of the pitch system when powered by the backup power supply, wherein the system parameters include DC bus voltage, motor voltage, motor current, pitch angle and detection time;

[0020] S23. Calculate the real-time output of the backup power supply based on the motor power and energy loss of the pitch control system.

[0021] Furthermore, the expression for calculating the real-time output of the backup power supply is:

[0022]

[0023] Where, W represents the real-time output of the backup power supply; P m Indicates the motor power of the pitch motor; P loss Indicates the energy loss of the pitch motor; u m Indicates the line voltage of the pitch motor power input; i m represents the line current of the variable pitch motor power input; t represents the detection time of the variable pitch system; Indicates the power factor of the pitch motor.

[0024] Furthermore, based on the monitored system parameters and calculation results, evaluating the health diagnosis type and battery health of the backup power supply, and issuing control instructions for the pitch control system include the following steps:

[0025] S31. When the monitored DC bus voltage is lower than the voltage limit value, the backup power supply is judged to be abnormally healthy, a fault is triggered, and the pitch system resumes the main power supply and shuts down;

[0026] S32: When the real-time output of the backup power supply is greater than the set output value, it is determined that the backup power supply is healthy and normal, and the pitch control system resumes the main power supply and operates normally;

[0027] S33, when the pitch angle reaches the detection stop angle or exceeds the detection time, it is determined that the backup power supply detection is not completed, and the pitch system resumes the main power supply and warns the operation;

[0028] S34. Based on the determination result of the system parameters, calibrate the health diagnosis type of the backup power supply after the detection process is completed, and calculate the battery health of the backup power supply based on the change of the system parameters.

[0029] Furthermore, the expression for calculating the battery health of the backup power supply is:

[0030]

[0031] In the formula, S oh Indicates battery health; u b_st Indicates the lowest value of the battery voltage in the backup power supply during the detection process; u bl_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy release value during the detection process; u b_rat Indicates the rated voltage of the battery in the backup power supply; w rat Indicates the standard value of energy released in a single test.

[0032] In a second aspect, the present invention further provides a backup power supply health status diagnosis and control system, the system comprising:

[0033] The command detection module is used to monitor the detection commands of the backup power supply in real time during the normal operation of the pitch control system, wherein the detection commands include external detection commands and self-detection commands;

[0034] The status monitoring module is used to trigger the blade detection condition when the variable pitch system receives the detection instruction, start monitoring the system parameters of the variable pitch system, and calculate the real-time output of the backup power supply;

[0035] The diagnostic control module is used to evaluate the health diagnosis type and battery health of the backup power supply based on the monitored system parameters and calculation results, and issue control instructions for the variable pitch system.

[0036] Further, the instruction detection module includes: an external detection submodule and a self-detection submodule;

[0037] Among them, the external detection submodule is used to monitor the external detection instructions initiated by the main control in real time during the operation of the pitch system;

[0038] The self-detection submodule is used to monitor the operating status of the variable pitch system in real time. If the operating status meets the fault triggering condition, the variable pitch system initiates a self-detection command.

[0039] Furthermore, the state monitoring module includes: a power switching submodule, a parameter monitoring submodule and an output calculation submodule;

[0040] Among them, the power switching submodule is used to disconnect the main power supply of the pitch system based on the detection instruction received by the pitch system when the blade runs to the detection start angle, and only start the backup power supply;

[0041] The parameter monitoring submodule is used to monitor the system parameters of the pitch system in real time when it is powered by the backup power supply, wherein the system parameters include DC bus voltage, motor voltage, motor current, pitch angle and detection time;

[0042] The output calculation submodule is used to calculate the real-time output of the backup power supply based on the motor power and energy loss of the variable pitch system.

[0043] Furthermore, the expression for calculating the real-time output of the backup power supply is:

[0044]

[0045] Where, W represents the real-time output of the backup power supply; P m Indicates the motor power of the pitch motor; P loss Indicates the energy loss of the pitch motor; u m Indicates the line voltage of the pitch motor power input; i m represents the line current of the variable pitch motor power input; t represents the detection time of the variable pitch system; Indicates the power factor of the pitch motor.

[0046] Further, the diagnosis control module includes: a voltage diagnosis submodule, an output diagnosis submodule, an angle diagnosis submodule and a health assessment submodule;

[0047] Among them, the voltage diagnosis submodule is used to determine that the backup power supply is abnormal when the monitored DC bus voltage is lower than the voltage limit value, trigger a fault, and the pitch system restores the main power supply and shuts down;

[0048] The output diagnosis submodule is used to determine that the backup power supply is healthy and normal when the real-time output of the backup power supply is greater than the set output value, and the pitch control system resumes the main power supply and operates normally;

[0049] Angle diagnosis submodule, used to determine that the backup power supply detection is not completed when the pitch angle reaches the detection stop angle or exceeds the detection time, and the pitch system resumes the main power supply and warns the operation;

[0050] The health assessment submodule is used to calibrate the health diagnosis type of the backup power supply after the detection process is completed based on the judgment results of the system parameters, and calculate the battery health of the backup power supply based on the changes in the system parameters.

[0051] Furthermore, the expression for calculating the battery health of the backup power supply is:

[0052]

[0053] In the formula, S oh Indicates battery health; u b_st Indicates the lowest value of the battery voltage in the backup power supply during the detection process; u bl_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy release value during the detection process; u b_rat Indicates the rated voltage of the battery in the backup power supply; w rat Indicates the standard value of energy release in a single test.

[0054] In a third aspect, the present invention further provides a computer device.

[0055] In some embodiments, the computer device includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0056] In a fourth aspect, the present invention also provides a computer-readable storage medium.

[0057] In one embodiment, the computer-readable storage medium stores a computer program, and the computer program implements the steps of the above method when executed by a processor.

[0058] The beneficial effects of the present invention are:

[0059] 1. The present invention adopts a method of dynamic blade operation detection to more directly and effectively evaluate the health of the backup power supply of the variable pitch system. Compared with the static detection method of a single parameter of the backup power supply, it is more reliable and can effectively ensure the safety of the wind turbine under abnormal power supply conditions, making the detection more accurate and reliable. It can improve the health diagnosis capability of the backup power supply of the variable pitch system, truly and effectively evaluate the backup power supply's propeller-feeding capability, and improve the diagnosis and control capabilities of the variable pitch system, which is of great practical significance for ensuring the long-term safe and stable operation of the wind turbine.

[0060] 2. The present invention does not require additional voltage, current and other devices, and can achieve backup power output estimation and battery voltage monitoring without new sensors, which is more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0062] Figure 1 is a flow chart of a backup power supply health status diagnosis and control method according to an embodiment of the present invention;

[0063] Figure 2 is a principle block diagram of a backup power supply health status diagnosis and control system according to an embodiment of the present invention;

[0064] Figure 3 is a schematic diagram of the health status diagnosis and control logic of a backup power supply of a wind turbine pitch control system according to an embodiment of the present invention;

[0065] Figure 4 is a schematic diagram of an operating curve of system parameters according to an embodiment of the present invention;

[0066] Figure 5 FIG. 4 is a schematic diagram of the structure of a computer device according to an embodiment of the present invention.

[0067] Figure numbers: 1. Command detection module; 2. Status monitoring module; 3. Diagnosis control module. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0069] See also Figure 1 , provides a backup power supply health status diagnosis control method, the method comprising the following steps:

[0070] S1. Real-time monitoring of detection instructions of the backup power supply during the normal operation of the pitch control system, wherein the detection instructions include external detection instructions and self-detection instructions.

[0071] In the description of the present invention, real-time monitoring of the detection instructions of the backup power supply during the normal operation of the pitch control system includes the following steps:

[0072] S11. During the operation of the pitch control system, external detection instructions initiated by the main control are monitored in real time.

[0073] The wind turbine pitch system includes the pitch motor, pitch drive, backup power supply, angle sensor and accessories, etc. The external detection command is initiated by the main control. During the normal operation of the pitch system, the main control sends a battery detection command, the pitch system cuts off the main power and runs on battery, and it is forbidden to detect the three blades at the same time.

[0074] S12. Monitor the operating status of the variable pitch system in real time during operation. If the operating status meets the fault triggering condition, the variable pitch system initiates a self-detection command.

[0075] Among them, the fault triggering conditions include abnormal main power fault, abnormal backup power supply fault, main control instructions and manual pitch control instructions.

[0076] Specifically, the main power abnormal fault mode is to monitor the DC bus value in real time and judge whether it is faulty by the DC bus voltage. If the voltage of the main power supply is greater than times and higher than the rated voltage of the backup power supply, the main power supply is judged to be abnormal. If the backup power supply is abnormal, there is a backup power supply failure and the detection is not completed, it will be judged by the last backup power supply detection process.

[0077] S2. When the variable pitch system receives the detection command, it triggers the blade detection condition, starts monitoring the system parameters of the variable pitch system, and calculates the real-time output of the backup power supply.

[0078] In the description of the present invention, when the pitch system receives the detection instruction, the blade detection condition is triggered, the system parameters of the pitch system are monitored, and the real-time output of the backup power supply is calculated, including the following steps:

[0079] S21. Based on the detection instruction received by the pitch control system, when the blade runs to the detection start angle, the main power supply of the pitch control system is disconnected, and only the backup power supply is started.

[0080] S22, real-time monitoring of system parameters of the pitch control system when it is powered by the backup power supply, wherein the system parameters include the DC bus voltage u dc , motor voltage um 、Motor current i m , pitch angle α and detection time t.

[0081] S23. Calculate the real-time output of the backup power supply based on the motor power and energy loss of the pitch control system.

[0082] In the description of the present invention, the expression for calculating the real-time output of the backup power supply is:

[0083]

[0084] Where, W represents the real-time output of the backup power supply; P m Indicates the motor power of the pitch motor; P loss Indicates the energy loss of the pitch motor; u m Indicates the line voltage of the pitch motor power input; i m represents the line current of the variable pitch motor power input; t represents the detection time of the variable pitch system; Indicates the power factor of the pitch motor.

[0085] Energy loss P loss The total power loss is mainly caused by factors such as the inverter's internal resistance, inductance, capacitance, switching loss, and hysteresis loss:

[0086] P loss (t) = u dc ·i dc ·(1-D)·(R ds_on +R sw +R sn )

[0087] In the formula, u dc is the DC voltage; i dc is the DC current; D is the duty cycle; R ds_on is the output switch tube leakage resistance; R sw is the forward resistance of the output diode when it is turned on; R sn is the reverse resistance of the output diode.

[0088] S3. Based on the monitored system parameters and calculation results, the health diagnosis type and battery health of the backup power supply are evaluated, and control instructions for the variable pitch system are issued.

[0089] In the description of the present invention, based on the monitored system parameters and calculation results, evaluating the health diagnosis type and battery health of the backup power supply, and issuing control instructions for the pitch control system include the following steps:

[0090] S31. When the monitored DC bus voltage is lower than the voltage limit value, the backup power supply is judged to be abnormally healthy, a fault is triggered, and the pitch system restores the main power supply and shuts down.

[0091] S32. When the real-time output of the backup power supply is greater than the set output value, the backup power supply is determined to be healthy and normal, and the pitch control system resumes the main power supply and operates normally.

[0092] S33. When the pitch angle reaches the detection stop angle or exceeds the detection time, it is determined that the backup power supply detection is not completed, and the pitch system resumes the main power supply and warns operation.

[0093] S34. Based on the determination result of the system parameters, calibrate the health diagnosis type of the backup power supply after the detection process is completed, and calculate the battery health of the backup power supply based on the change of the system parameters.

[0094] Among them, the health diagnosis types of the backup power supply include normal backup power supply status, abnormal backup power supply, and backup power supply status warning.

[0095] In the description of the present invention, the expression for calculating the battery health of the backup power supply is:

[0096]

[0097] In the formula, S oh Indicates battery health; u b_st Indicates the lowest value of the battery voltage in the backup power supply during the detection process; u bl_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy release value during the detection process; u b_rat Indicates the rated voltage of the battery in the backup power supply; w rat Indicates the standard value of energy released in a single test.

[0098] See also Figure 2 The present invention also provides a backup power supply health status diagnosis and control system, the system comprising:

[0099] The command detection module 1 is used for real-time monitoring of the detection commands of the backup power supply during the normal operation of the pitch control system, wherein the detection commands include external detection commands and self-detection commands.

[0100] The state monitoring module 2 is used to trigger the blade detection condition when the variable pitch system receives the detection instruction, start monitoring the system parameters of the variable pitch system, and calculate the real-time output of the backup power supply.

[0101] The diagnosis control module 3 is used to evaluate the health diagnosis type and battery health of the backup power supply based on the monitored system parameters and calculation results, and issue control instructions for the variable pitch system.

[0102] In the description of the present invention, the instruction detection module 1 includes: an external detection submodule (not shown in the figure) and a self-detection submodule (not shown in the figure).

[0103] Among them, the external detection submodule is used to monitor the external detection instructions initiated by the main control in real time during the operation of the variable pitch system.

[0104] The self-detection submodule is used to monitor the operating status of the variable pitch system in real time. If the operating status meets the fault triggering condition, the variable pitch system initiates a self-detection command.

[0105] In the description of the present invention, the state monitoring module 2 includes: a power switching submodule (not shown in the figure), a parameter monitoring submodule (not shown in the figure) and an output calculation submodule (not shown in the figure).

[0106] Among them, the power switching submodule is used to disconnect the main power supply of the variable pitch system based on the detection instruction received by the variable pitch system when the blade runs to the detection start angle, and only start the backup power supply.

[0107] The parameter monitoring submodule is used to monitor the system parameters of the variable pitch system in real time when it is powered by a backup power supply, where the system parameters include DC bus voltage, motor voltage, motor current, variable pitch angle and detection time.

[0108] The output calculation submodule is used to calculate the real-time output of the backup power supply based on the motor power and energy loss of the variable pitch system.

[0109] In the description of the present invention, the expression for calculating the real-time output of the backup power supply is:

[0110]

[0111] Where, W represents the real-time output of the backup power supply; P m Indicates the motor power of the pitch motor; P loss Indicates the energy loss of the pitch motor; u m Indicates the line voltage of the pitch motor power input; i m represents the line current of the variable pitch motor power input; t represents the detection time of the variable pitch system; Indicates the power factor of the pitch motor.

[0112] In the description of the present invention, the diagnosis control module 3 includes: a voltage diagnosis submodule (not shown in the figure), an output diagnosis submodule (not shown in the figure), an angle diagnosis submodule (not shown in the figure) and a health assessment submodule (not shown in the figure).

[0113] Among them, the voltage diagnosis submodule is used to determine that the backup power supply is abnormal in health when the monitored DC bus voltage is lower than the voltage limit value, trigger a fault, and the variable pitch system restores the main power supply and shuts down.

[0114] The output diagnosis submodule is used to determine that the backup power supply is healthy and normal when the real-time output of the backup power supply is greater than the set output value, and the variable pitch system resumes the main power supply and operates normally.

[0115] The angle diagnosis submodule is used to determine that the backup power supply detection is not completed when the pitch angle reaches the detection stop angle or exceeds the detection time, and the pitch system restores the main power supply and warns the operation.

[0116] The health assessment submodule is used to calibrate the health diagnosis type of the backup power supply after the detection process is completed based on the judgment results of the system parameters, and calculate the battery health of the backup power supply based on the changes in the system parameters.

[0117] In the description of the present invention, the expression for calculating the battery health of the backup power supply is:

[0118]

[0119] In the formula, S oh Indicates battery health; u b_st Indicates the lowest value of the battery voltage in the backup power supply during the detection process; u bl _ lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy release value during the detection process; u b_rat Indicates the rated voltage of the battery in the backup power supply; w rat It indicates the standard value of energy release in a single test (this value matches the pitch load and is taken as the energy consumed by the blade within the test operating range).

[0120] Example

[0121] like Figure 1 , Figure 2 As shown, the present invention introduces a backup power supply health status diagnosis and control method and system for a wind turbine pitch system that integrates multi-source data of a wind turbine. To test the feasibility of the strategy, a test was conducted on a Huachuang 1.5MW wind turbine in a certain wind farm. The pitch system uses an AC asynchronous motor and a backup power supply uses a lead-acid battery. The system parameters are shown in Table 1.

[0122] Table 1: System parameters

[0123] parameter Numeric Inverter input voltage / V 230 Inverter loss / % 5 Pitch motor power factor 0.85 Battery quantity / unit 22 Battery nominal voltage / V 12 Battery nominal capacity / Ah 7.2

[0124] The backup power supply diagnostic parameters are shown in Table 2.

[0125] Table 2: Backup power supply diagnostic parameter table

[0126] parameter Numeric Detection start angle / ° 80 Detection stop angle / ° 40 Battery voltage low trigger value / V 275 Energy / J 8100 Time / s 20

[0127] Use old lead-acid batteries for testing, collect the operation curves of pitch angle, DC bus voltage, motor operating voltage, motor operating current, energy consumption, main power status, etc. Figure 4 The control mode and system status are shown in Figure 3 As shown, when the variable pitch system receives the backup power supply detection instruction, first, when the blade angle runs to 80 degrees, the system disconnects the main power supply. At this time, the backup power supply is used to provide energy for operation, and the DC bus voltage is the backup power supply voltage. Then, the blades continue to run, the remaining power of the backup power supply decreases, the charge state changes, and the DC bus voltage drops to 275V, triggering a low battery voltage fault. Finally, the system restores the main power supply, the DC bus voltage restores the main power supply, and the backup power supply detection is completed. The system can take different processing measures according to the detection results.

[0128] The handling measures are usually as follows: if the backup power supply fails, the pitch system retracts and shuts down; if the backup power supply detection is not completed, a warning is sent to the main control and the pitch system operates normally; if the backup power supply is normal, the pitch system operates normally.

[0129] In summary, with the help of the above technical solutions of the present invention, the present invention adopts the method of dynamic operation detection of blades to more directly and effectively evaluate the health of the backup power supply of the variable pitch system. Compared with the static detection method of a single parameter of the backup power supply, it is more reliable and can effectively ensure the safety of the wind turbine in the case of abnormal power supply, making the detection more accurate and reliable; thereby improving the health diagnosis capability of the backup power supply of the variable pitch system, truly and effectively evaluating the backup power supply's propeller-aligning capability, and improving the diagnosis and control capabilities of the variable pitch system, which is of great practical significance for ensuring the long-term safe and stable operation of the wind turbine. The present invention does not require the addition of additional voltage, current and other devices, and realizes backup power supply output estimation and battery voltage monitoring without new sensors, which is more economical.

[0130] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 5 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

[0131] Those skilled in the art will understand that Figure 5 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0132] In addition, the present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiment when executing the computer program.

[0133] In addition, the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

[0134] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0135] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

Claims

1. A backup power supply health status diagnosis and control method, characterized in that: The method comprises the following steps: S1. Real-time monitoring of detection instructions of the backup power supply during normal operation of the pitch control system, wherein the detection instructions include external detection instructions and self-detection instructions; S2. When the pitch control system receives the detection command, it triggers the blade detection condition, starts monitoring the system parameters of the pitch control system, and calculates the real-time output of the backup power supply; S3. Based on the monitored system parameters and calculation results, evaluate the health diagnosis type and battery health of the backup power supply, and issue control instructions for the pitch control system; The method of evaluating the health diagnosis type and battery health of the backup power supply based on the monitored system parameters and calculation results, and issuing control instructions for the pitch control system includes the following steps: S31. When the monitored DC bus voltage is lower than the voltage limit value, the backup power supply is judged to be abnormally healthy, a fault is triggered, and the pitch system resumes the main power supply and shuts down; S32: When the real-time output of the backup power supply is greater than the set output value, it is determined that the backup power supply is healthy and normal, and the pitch control system resumes the main power supply and operates normally; S33, when the pitch angle reaches the detection stop angle or exceeds the detection time, it is determined that the backup power supply detection is not completed, and the pitch system resumes the main power supply and warns the operation; S34, based on the determination result of the system parameters, calibrating the health diagnosis type of the backup power supply after the detection process is completed, and calculating the battery health of the backup power supply based on the change of the system parameters; The expression for calculating the battery health of the backup power supply is: In the formula, S oh Indicates battery health; u b_st Indicates the lowest value of the battery voltage in the backup power supply during the detection process; u b1_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy release value during the detection process; u b_rat Indicates the rated voltage of the battery in the backup power supply; w rat Indicates the standard value of energy released in a single test.

2. A backup power supply health status diagnosis and control method according to claim 1, characterized in that: The real-time monitoring of the detection instructions of the backup power supply during the normal operation of the pitch control system includes the following steps: S11. During the operation of the pitch control system, real-time monitoring of external detection instructions initiated by the main control; S12. Monitor the operating status of the variable pitch system in real time during operation. If the operating status meets the fault triggering condition, the variable pitch system initiates a self-detection command.

3. A backup power supply health status diagnosis and control method according to claim 2, characterized in that: The fault triggering conditions include main power abnormal fault, backup power abnormal fault, main control command and manual pitch control command.

4. The backup power supply health status diagnosis and control method according to claim 1, characterized in that: When the pitch control system receives the detection instruction, the blade detection condition is triggered, the system parameters of the pitch control system are monitored, and the real-time output of the backup power supply is calculated, which includes the following steps: s21. Based on the detection instruction received by the pitch control system, when the blade runs to the detection start angle, the main power supply of the pitch control system is disconnected, and only the backup power supply is started; S22, real-time monitoring of system parameters of the pitch system when powered by a backup power supply, wherein the system parameters include DC bus voltage, motor voltage, motor current, pitch angle, and detection time; S23. Calculate the real-time output of the backup power supply based on the motor power and energy loss of the pitch control system.

5. A backup power supply health status diagnosis and control method according to claim 4, characterized in that: The expression for calculating the real-time output of the backup power supply is: In the formula, W represents the real-time output of the backup power supply; P m Indicates the motor power of the pitch motor; P loss Indicates the energy loss of the pitch motor; u m Indicates the line voltage of the pitch motor power input; i m Indicates the line current of the pitch motor power input; t represents the detection time of the pitch system; Indicates the power factor of the pitch motor.

6. A backup power supply health status diagnosis control system, used to implement the backup power supply health status diagnosis control method according to any one of claims 1 to 5, characterized in that: The system includes: An instruction detection module is used to monitor in real time the detection instructions of the backup power supply during the normal operation of the pitch control system, wherein the detection instructions include external detection instructions and self-detection instructions; The status monitoring module is used to trigger the blade detection condition when the variable pitch system receives the detection instruction, start monitoring the system parameters of the variable pitch system, and calculate the real-time output of the backup power supply; The diagnostic control module is used to evaluate the health diagnosis type and battery health of the backup power supply based on the monitored system parameters and calculation results, and issue control instructions for the pitch control system; The diagnostic control module includes: a voltage diagnostic submodule, an output diagnostic submodule, an angle diagnostic submodule and a health assessment submodule; The voltage diagnosis submodule is used to determine that the backup power supply is abnormal when the monitored DC bus voltage is lower than the voltage limit value, trigger a fault, and the pitch system restores the main power supply and shuts down; The output diagnosis submodule is used to determine that the backup power supply is healthy and normal when the real-time output of the backup power supply is greater than the set output value, and the pitch control system resumes the main power supply and operates normally; The angle diagnosis submodule is used to determine that the backup power supply detection is not completed when the pitch angle reaches the detection stop angle or exceeds the detection time, and the pitch system resumes the main power supply and warns the operation; The health evaluation submodule is used to calibrate the health diagnosis type of the backup power supply after the detection process is completed based on the determination result of the system parameters, and calculate the battery health of the backup power supply based on the change of the system parameters; The expression for calculating the battery health of the backup power supply is: In the formula, S oh Indicates battery health; u b_st Indicates the lowest value of the battery voltage in the backup power supply during the detection process; u b1_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy release value during the detection process; u b_rat Indicates the rated voltage of the battery in the backup power supply; w rat Indicates the standard value of energy released in a single test.

7. A backup power supply health status diagnosis and control system according to claim 6, characterized in that: The instruction detection module includes: an external detection submodule and a self-detection submodule; The external detection submodule is used to monitor the external detection instructions initiated by the main control in real time during the operation of the pitch control system; The self-detection submodule is used to monitor the operating status of the variable pitch system in real time during operation. If the operating status meets the fault triggering condition, the variable pitch system initiates a self-detection instruction.

8. A backup power supply health status diagnosis and control system according to claim 7, characterized in that: The state monitoring module includes: a power switching submodule, a parameter monitoring submodule and an output calculation submodule; The power switching submodule is used to disconnect the main power supply of the pitch control system and only start the backup power supply when the blade runs to the detection start angle based on the detection instruction received by the pitch control system; The parameter monitoring submodule is used to monitor in real time the system parameters of the pitch system when it is powered by a backup power supply, wherein the system parameters include DC bus voltage, motor voltage, motor current, pitch angle and detection time; The output calculation submodule is used to calculate the real-time output of the backup power supply based on the motor power and energy loss of the variable pitch system.

9. A backup power supply health status diagnosis and control system according to claim 8, characterized in that: The expression for calculating the real-time output of the backup power supply is: In the formula, W represents the real-time output of the backup power supply; P m Indicates the motor power of the pitch motor; P loss Indicates the energy loss of the pitch motor; u m Indicates the line voltage of the pitch motor power input; i m Indicates the line current of the pitch motor power input; t represents the detection time of the pitch system; Indicates the power factor of the pitch motor.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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