State-of-health diagnosis and control method and system for backup power supply, and device and medium

Abstract

The present invention relates to the technical field of wind turbine control. Disclosed are a state-of-health diagnosis and control method and system for a backup power supply, and a device and a medium. The method comprises the following steps: S1, detecting in real time detection instructions for a backup power supply during the normal operation of a variable-pitch system, wherein the detection instructions comprise an external detection instruction and a self-detection instruction; S2, after the variable-pitch system receives the detection instructions, triggering a blade detection condition, starting to monitor system parameters of the variable-pitch system, and calculating the real-time output of the backup power supply; and S3, on the basis of the system parameters obtained from monitoring, and a calculation result, evaluating the health diagnosis type of the backup power supply and the battery state-of-health of same, and issuing a control instruction for the variable-pitch system. In the present invention, by means of dynamically detecting the operation of a blade, the state of health of a backup power supply for a variable-pitch system is evaluated more directly and effectively, thereby effectively ensuring the safety of a wind turbine in an abnormal power supply situation and thus making detection more accurate and reliable.

Description

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

[0001] This invention relates to the field of wind turbine control technology, and in particular to a backup power supply health status diagnosis and control method, system, device and medium. Background Technology

[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives a rotor to rotate and ultimately outputs alternating current. A wind turbine typically consists of components such as a wind turbine, generator, tower, speed-limiting safety mechanism, and energy storage device.

[0003] The pitch system, as a crucial control and protection device for wind turbines, plays a vital role in blade control and wind energy capture. When a wind turbine malfunctions, the pitch system must retract the blades to a safe position to achieve air braking, serving as the most critical safety feature of the wind turbine. In the event of grid power failure, the pitch system must utilize its own backup power source to provide energy for the retraction function. Currently, with the rapid development of the wind power industry, the reliability and stability of the pitch system's backup power source, as a crucial component of wind turbines, have received widespread attention.

[0004] Currently, lead-acid battery-based backup power for pitch systems is a widely used solution in the industry. Lead-acid batteries play a crucial role in pitch system backup power. Their stability, reliability, and relatively low cost make them the preferred power source in the wind power sector. However, lead-acid batteries also have some drawbacks, such as low energy density, slow charging speed, and limited lifespan. These issues have a certain impact on the long-term performance of lead-acid batteries in pitch system backup power.

[0005] To address the issue of monitoring the status of backup power in pitch control systems, a battery management system (BMS) has been introduced into the charging and discharging processes of lead-acid batteries. The BMS can monitor various battery parameters in real time, ensuring they operate within safe ranges. By effectively controlling the charging and discharging processes of lead-acid batteries, overcharging and over-discharging can be prevented, thereby extending battery life.

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

[0007] No effective solutions have yet been proposed to address the problems in the relevant technologies. Summary of the Invention

[0008] Therefore, it is necessary to provide a backup power supply health status diagnosis and control method, system, device and medium to address the above-mentioned 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 backup power supply during normal operation of the pitch system, including external monitoring commands and self-monitoring commands;

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

[0012] S3. Based on the system parameters and calculation results obtained from monitoring, assess the health diagnosis type and battery health of the backup power supply, and issue control commands to the pitch system.

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

[0014] S11. During the operation of the pitch system, monitor external detection commands initiated by the main controller in real time;

[0015] S12. Monitor the operating status of the pitch system in real time. If the operating status meets the fault triggering conditions, the pitch system will initiate a self-test command.

[0016] Furthermore, fault triggering conditions include main power supply abnormality, backup power supply abnormality, main control commands, and pitch manual commands.

[0017] Furthermore, when the pitch system receives a detection command, it triggers the blade detection condition, begins monitoring the system parameters of the pitch system, and calculates the real-time output of the backup power supply, including the following steps:

[0018] S21. Based on the detection command received by the pitch system, when the blades run to the detection start angle, disconnect the main power supply of the pitch system and only start the backup power supply.

[0019] S22. Real-time monitoring of system parameters of the pitch system when powered by backup power, including DC bus voltage, motor voltage, motor current, pitch angle and detection time.

[0020] S23. Based on the motor power and energy loss of the pitch system, calculate the real-time output of the backup power supply.

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

[0022] In the formula, W represents the real-time output of the backup power supply; P m P represents the motor power of the pitch motor. loss Indicates the energy loss of the pitch motor; u m represents the line voltage input to the pitch motor power supply; i represents the line current input to the pitch motor power supply; t represents the detection time of the pitch system. This indicates the power factor of the pitch motor.

[0023] Furthermore, 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 commands for the pitch system are issued, including the following steps:

[0024] S31. When the monitored DC voltage of the bus is lower than the voltage limit, the backup power supply is deemed to be abnormal, triggering a fault. The pitch system then restores the main power supply and shuts down.

[0025] 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 system restores the main power supply and operates normally.

[0026] S33. When the pitch angle reaches the detection stop angle or exceeds the detection time, it is determined that the backup power detection has not been completed, the pitch system restores the main power supply and issues a warning.

[0027] S34. Based on the judgment results of system parameters, calibrate the health diagnosis type of the backup power supply after the detection process ends, and calculate the battery health of the backup power supply based on the changes in system parameters.

[0028] Furthermore, the expression for calculating the battery health of the backup power supply is:

[0029] In the formula, S oh Indicates battery health; u b_st This indicates the lowest battery voltage in the backup power supply during the testing process; u bl_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy released during the detection process; u b_rat Indicates the rated voltage of the backup power supply battery; w rat This indicates the standard value of energy release in a single test.

[0030] Secondly, the present invention also provides a backup power supply health status diagnosis and control system, the system comprising:

[0031] The command detection module is used to monitor the detection commands of the backup power supply during the normal operation of the pitch system in real time. The detection commands include external detection commands and self-detection commands.

[0032] The status monitoring module is used to trigger the blade detection condition when the pitch system receives a detection command, start monitoring the system parameters of the pitch system, and calculate the real-time output of the backup power supply.

[0033] The diagnostic control module is used to assess the health diagnosis type and battery health of the backup power supply based on the system parameters obtained from monitoring and the calculation results, and to issue control commands to the pitch system.

[0034] Furthermore, the instruction detection module includes: an external detection submodule and a self-detection submodule;

[0035] The external detection submodule is used to monitor external detection commands initiated by the main controller in real time during the operation of the pitch system.

[0036] The self-testing submodule is used to monitor the operating status of the pitch system in real time. If the operating status meets the fault triggering conditions, the pitch system will initiate a self-testing command.

[0037] Furthermore, the status monitoring module includes: a power switching submodule, a parameter monitoring submodule, and an output calculation submodule;

[0038] Among them, the power switching submodule is used to disconnect the main power supply of the pitch system and start the backup power supply only when the blade runs to the detection start angle based on the detection command received by the pitch system.

[0039] The parameter monitoring submodule is used to monitor the system parameters of the pitch system in real time when it is powered by a backup power supply. The system parameters include DC bus voltage, motor voltage, motor current, pitch angle and detection time.

[0040] 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 pitch system.

[0041] Furthermore, the expression for calculating the real-time output of the backup power supply is:

[0042] In the formula, W represents the real-time output of the backup power supply; P m P represents the motor power of the pitch motor. loss Indicates the energy loss of the pitch motor; u m represents the line voltage input to the pitch motor power supply; i represents the line current input to the pitch motor power supply; t represents the detection time of the pitch system. This indicates the power factor of the pitch motor.

[0043] Furthermore, the diagnostic control module includes: a voltage diagnostic submodule, an output diagnostic submodule, an angle diagnostic submodule, and a health assessment submodule;

[0044] Among them, the voltage diagnosis submodule is used to determine the abnormal health of the backup power supply when the monitored bus DC voltage is lower than the voltage limit value, trigger the fault, and the pitch system restores the main power supply and shuts down.

[0045] 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 system restores the main power supply and operates normally.

[0046] The angle diagnosis submodule is used to determine that the backup power supply detection has not been completed when the pitch angle reaches the detection stop angle or exceeds the detection time. The pitch system then restores the main power supply and issues a warning.

[0047] The health assessment submodule is used to determine the health diagnosis type of the backup power supply after the detection process is completed based on the judgment results of system parameters, and to calculate the battery health of the backup power supply based on the changes in system parameters.

[0048] Furthermore, the expression for calculating the battery health of the backup power supply is:

[0049] In the formula, S oh Indicates battery health; u b_st This indicates the lowest battery voltage in the backup power supply during the testing process; u bl_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy released during the detection process; u b_rat Indicates the rated voltage of the backup power supply battery; w rat This indicates the standard value of energy release in a single test.

[0050] Thirdly, the present invention also provides a computer device.

[0051] In some embodiments, the computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described above.

[0052] Fourthly, the present invention also provides a computer-readable storage medium.

[0053] In one embodiment, a computer program is stored on the computer-readable storage medium, which, when executed by a processor, implements the steps of the above method.

[0054] The beneficial effects of this invention are as follows:

[0055] 1. This invention adopts a dynamic blade operation detection method, which more directly and effectively assesses the health of the pitch system's backup power supply. 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 event of power supply abnormalities. This makes the detection more accurate and reliable. As a result, it can improve the health diagnosis capability of the pitch system's backup power supply, truly and effectively evaluate the feathering capability of the backup power supply, and improve the diagnostic and control capabilities of the pitch system. This has very important practical significance for ensuring the long-term safe and stable operation of the wind turbine.

[0056] 2. This invention eliminates the need for additional voltage and current sensors, enabling backup power output estimation and battery voltage monitoring without the need for new sensors, thus achieving greater economic efficiency. Attached Figure Description

[0057] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0058] Figure 1 is a flowchart of a backup power health status diagnosis and control method according to an embodiment of the present invention;

[0059] Figure 2 is a schematic block diagram of a backup power health status diagnosis and control system according to an embodiment of the present invention.

[0060] Figure 3 is a schematic diagram of the backup power health status diagnosis and control logic of a wind turbine pitch system according to an embodiment of the present invention.

[0061] Figure 4 is a schematic diagram of the operating curves of the system parameters according to an embodiment of the present invention;

[0062] Figure 5 is a schematic diagram of the structure of a computer device according to an embodiment of the present invention.

[0063] The reference numerals are: 1. Command detection module; 2. Status monitoring module; 3. Diagnostic control module. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0065] Please refer to Figure 1, which provides a backup power supply health status diagnosis and control method, which includes the following steps:

[0066] S1. Real-time monitoring of backup power supply during normal operation of the pitch system, including external monitoring commands and self-monitoring commands.

[0067] In the description of this invention, the detection command for real-time monitoring of the backup power supply during normal operation of the pitch system includes the following steps:

[0068] S11. During the operation of the pitch system, monitor external detection commands initiated by the main controller in real time.

[0069] The wind turbine pitch system includes a pitch motor, pitch driver, backup power supply, angle sensor, and accessories. External detection commands are initiated by the main controller. During normal operation of the pitch system, the main controller sends a battery detection command, causing the pitch system to disconnect from the main power supply and operate on battery power. Simultaneous detection of all three blades is prohibited.

[0070] S12. Monitor the operating status of the pitch system in real time. If the operating status meets the fault triggering conditions, the pitch system will initiate a self-test command.

[0071] The fault triggering conditions include main power supply abnormality, backup power supply abnormality, main control command and pitch manual command.

[0072] Specifically, the main power supply fault diagnosis method involves real-time monitoring of the DC bus voltage to determine if a fault has occurred. When the DC bus voltage is lower than... If the main power voltage is twice that of the backup power supply and is higher than the rated voltage of the backup power supply, the main power supply is considered to be faulty. If the backup power supply is faulty or the test is not completed, the fault is determined by the previous backup power supply test procedure.

[0073] S2. When the pitch system receives the detection command, it triggers the blade detection condition, starts monitoring the system parameters of the pitch system, and calculates the real-time output of the backup power supply.

[0074] In the description of this invention, when the pitch system receives a detection command, it triggers the blade detection condition, begins monitoring the system parameters of the pitch system, and calculates the real-time output of the backup power supply, including the following steps:

[0075] S21. Based on the detection command received by the pitch system, when the blades run to the detection start angle, disconnect the main power supply of the pitch system and only start the backup power supply.

[0076] S22. Real-time monitoring of system parameters of the pitch system when powered by backup power, including DC bus voltage u. dc Motor voltage u m Motor current i m The pitch angle α and the detection time t.

[0077] S23. Based on the motor power and energy loss of the pitch system, calculate the real-time output of the backup power supply.

[0078] In the description of this invention, the expression for calculating the real-time output of the backup power supply is:

[0079] In the formula, W represents the real-time output of the backup power supply; P m P represents the motor power of the pitch motor. loss Indicates the energy loss of the pitch motor; u m represents the line voltage input to the pitch motor power supply; i represents the line current input to the pitch motor power supply; t represents the detection time of the pitch system. This indicates the power factor of the pitch motor.

[0080] Energy loss P loss The total power loss is mainly caused by factors such as internal resistance, inductance, capacitance, switching losses, and hysteresis losses of the inverter: P loss (t)=u dc ·i dc ·(1-D)·(R ds_on +R sw +R sn )

[0081] In the formula, u dc DC voltage; i dc R is the direct current; D is the duty cycle; ds_on R is the leakage resistance of the output switch. sw R is the forward resistance when the output diode is turned on. sn This is the reverse resistance of the output diode.

[0082] S3. Based on the system parameters and calculation results obtained from monitoring, assess the health diagnosis type and battery health of the backup power supply, and issue control commands to the pitch system.

[0083] In the description of this invention, the process 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 commands to the pitch system, includes the following steps:

[0084] S31. When the monitored DC voltage of the bus is lower than the voltage limit, the backup power supply is determined to be abnormal, triggering a fault. The pitch system then restores the main power supply and shuts down.

[0085] 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 system restores the main power supply and operates normally.

[0086] S33. When the pitch angle reaches the detection stop angle or exceeds the detection time, it is determined that the backup power supply detection has not been completed, the pitch system restores the main power supply and issues a warning.

[0087] S34. Based on the judgment results of system parameters, calibrate the health diagnosis type of the backup power supply after the detection process ends, and calculate the battery health of the backup power supply based on the changes in system parameters.

[0088] Among them, the health diagnosis types of backup power supply include backup power supply status normal, backup power supply abnormal, and backup power supply status warning.

[0089] In the description of this invention, the expression for calculating the battery health of the backup power supply is:

[0090] In the formula, S oh Indicates battery health; u b_st This indicates the lowest battery voltage in the backup power supply during the testing process; u bl_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy released during the detection process; u b_rat Indicates the rated voltage of the backup power supply battery; w rat This indicates the standard value of energy release in a single test.

[0091] Referring to Figure 2, the present invention also provides a backup power supply health status diagnosis and control system, the system comprising:

[0092] Command detection module 1 is used to monitor the detection commands of the backup power supply during the normal operation of the pitch system in real time. The detection commands include external detection commands and self-detection commands.

[0093] The status monitoring module 2 is used to trigger the blade detection condition when the pitch system receives a detection command, start monitoring the system parameters of the pitch system, and calculate the real-time output of the backup power supply.

[0094] The diagnostic control module 3 is used to assess the health diagnosis type and battery health of the backup power supply based on the system parameters obtained from monitoring and the calculation results, and to issue control commands to the pitch system.

[0095] In the description of this 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).

[0096] The external detection submodule is used to monitor external detection commands initiated by the main controller in real time during the operation of the pitch system.

[0097] The self-testing submodule is used to monitor the operating status of the pitch system in real time. If the operating status meets the fault triggering conditions, the pitch system will initiate a self-testing command.

[0098] In the description of this invention, the status 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).

[0099] The power switching submodule is used to disconnect the main power supply of the pitch system and start only the backup power supply when the blades run to the detection start angle, based on the detection command received by the pitch system.

[0100] The parameter monitoring submodule is used to monitor the system parameters of the pitch system in real time when it is powered by a backup power source. The system parameters include DC bus voltage, motor voltage, motor current, pitch angle, and detection time.

[0101] 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 pitch system.

[0102] In the description of this invention, the expression for calculating the real-time output of the backup power supply is:

[0103] In the formula, W represents the real-time output of the backup power supply; P m P represents the motor power of the pitch motor. loss Indicates the energy loss of the pitch motor; u m represents the line voltage input to the pitch motor power supply; i represents the line current input to the pitch motor power supply; t represents the detection time of the pitch system. This indicates the power factor of the pitch motor.

[0104] In the description of this invention, the diagnostic control module 3 includes: a voltage diagnostic submodule (not shown in the figure), an output diagnostic submodule (not shown in the figure), an angle diagnostic submodule (not shown in the figure), and a health assessment submodule (not shown in the figure).

[0105] The voltage diagnostic submodule is used to determine that the backup power supply is abnormal when the monitored bus DC voltage is lower than the voltage limit value, triggering a fault, and the pitch system will restore the main power supply and shut down.

[0106] 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 system restores the main power supply and operates normally.

[0107] The angle diagnosis submodule is used to determine that the backup power supply detection has not been completed when the pitch angle reaches the detection stop angle or exceeds the detection time. The pitch system then restores the main power supply and issues a warning.

[0108] The health assessment submodule is used to determine the health diagnosis type of the backup power supply after the detection process is completed based on the judgment results of system parameters, and to calculate the battery health of the backup power supply based on the changes in system parameters.

[0109] In the description of this invention, the expression for calculating the battery health of the backup power supply is:

[0110] In the formula, S oh Indicates battery health; u b_st This indicates the lowest battery voltage in the backup power supply during the testing process; u bl_lim Indicates the lower limit of the battery voltage in the backup power supply; w st Indicates the energy released during the detection process; u b_rat Indicates the rated voltage of the backup power supply battery; w rat This represents the standard value of energy release in a single test (this value is matched with the pitch load, and its value is the energy consumed by the blades within the test operating range).

[0111] Example

[0112] As shown in Figures 1 and 2, this invention introduces a method and system for diagnosing and controlling the backup power supply health status of a wind turbine pitch system that integrates multi-source data from the wind turbine. To test the feasibility of the strategy, tests were conducted on a Huachuang 1.5MW wind turbine at a wind farm. This pitch system uses an AC asynchronous motor, and the backup power supply is a lead-acid battery. The system parameters are shown in Table 1.

[0113] Table 1: System Parameter Table

[0114] The backup power supply diagnostic parameters are shown in Table 2.

[0115] Table 2: Backup Power Supply Diagnostic Parameter Table

[0116] The test was conducted using old lead-acid batteries, and operating curves were collected for pitch angle, DC bus voltage, motor operating voltage, motor operating current, energy consumption, and main power status, as shown in Figure 4. The control method and system status are shown in Figure 3. When the pitch system receives a backup power detection command, firstly, when the blade angle reaches 80 degrees, the system disconnects the main power supply. At this time, the backup power supply provides energy for operation, and the DC bus voltage is the backup power supply voltage. Then, as the blades continue to operate, the remaining charge in the backup power supply decreases, the state of charge 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 returns to the main power supply voltage, and the backup power detection is complete. The system can take different handling measures based on the detection results.

[0117] The typical handling measures are as follows: if the backup power supply fails, the pitch system will retract the pitch and stop the engine; if the backup power supply test is not completed, a warning will be sent to the main controller and the pitch system will operate normally; if the backup power supply is normal, the pitch system will operate normally.

[0118] In summary, by utilizing the above-mentioned technical solution of this invention, the dynamic operation detection method of the blades provides a more direct and effective assessment of the health of the pitch system's backup power supply. Compared to static detection methods using a single parameter of the backup power supply, this method is more reliable and can effectively ensure the safety of the wind turbine under abnormal power supply conditions, resulting in higher accuracy and reliability of the detection. This enhances the health diagnosis capability of the pitch system's backup power supply, accurately and effectively evaluates the feathering capability of the backup power supply, and improves the diagnostic and control capabilities of the pitch system. This is of great practical significance for ensuring the long-term safe and stable operation of wind turbines. Furthermore, this invention eliminates the need for additional voltage and current sensors, enabling backup power supply output estimation and battery voltage monitoring without the need for new sensors, thus offering greater economic efficiency.

[0119] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram is shown in Figure 5. The computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores static and dynamic information data. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the above method embodiment.

[0120] Those skilled in the art will understand that the structure shown in Figure 5 is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device to which the present invention is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0121] In addition, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0122] In addition, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the above method embodiments.

[0123] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided by this 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 storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0124] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

Claims

1. A backup power supply health state diagnosis control method characterized by comprising: The method comprises the following steps: S1, real-time monitoring of detection instructions of the backup power supply in the normal operation process of the variable pitch system, wherein the detection instructions comprise external detection instructions and self-detection instructions; S2, after the variable pitch system receives the detection instructions, triggering the blade detection condition, starting to monitor the system parameters of the variable pitch system, and calculating the real-time output of the backup power supply; S3, based on the monitoring system parameters and the calculation results, evaluating the health diagnosis type and the battery health degree of the backup power supply, and issuing control instructions of the variable pitch system.

2. The method of claim 1, wherein, The real-time monitoring of the detection instructions of the backup power supply in the normal operation process of the variable pitch system comprises the following steps: S11, during the operation of the variable pitch system, real-time monitoring of external detection instructions initiated by the main control; S12, real-time monitoring of the running state of the variable pitch system during operation, if the running state meets the fault triggering condition, the variable pitch system initiates self-detection instructions.

3. The method of claim 2, wherein, The fault triggering condition includes main power abnormal failure, backup power supply abnormal failure, main control instruction and variable pitch manual instruction.

4. The method of claim 1, wherein, The step of, after the variable pitch system receives the detection instructions, triggering the blade detection condition, starting to monitor the system parameters of the variable pitch system, and calculating the real-time output of the backup power supply comprises the following steps: S21, based on the detection instructions received by the variable pitch system, when the blade runs to the detection start angle, disconnecting the main power supply of the variable pitch system, and only starting the backup power supply; S22, real-time monitoring of the system parameters of the variable pitch system when powered by the backup power supply, wherein the system parameters include DC bus voltage, motor voltage, motor current, variable pitch angle and detection time; S23, based on the motor power and energy loss of the variable pitch system, calculating the real-time output of the backup power supply.

5. The method of claim 4, wherein, 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 represents the motor power of the pitch motor; P loss represents the energy loss of the pitch motor; u m Vline represents the line voltage of the pitch motor power input; i represents the line current of the variable pitch motor power supply input; t represents the detection time of the variable pitch system; represents the power factor of the variable pitch motor.

6. The method of claim 1, wherein, The step of, based on the monitoring system parameters and the calculation results, evaluating the health diagnosis type and the battery health degree of the backup power supply, and issuing control instructions of the variable pitch system comprises the following steps: S31, when the monitored bus DC voltage is lower than the voltage limit value, it is determined that the backup power supply is abnormal, the fault is triggered, the variable pitch system restores the main power supply and stops; 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, the variable pitch system restores the main power supply and operates normally; S33, when the variable pitch angle runs to the detection stop angle or exceeds the detection time, it is determined that the backup power supply detection is not completed, the variable pitch system restores the main power supply and warns the operation; S34, based on the determination results of the system parameters, the health diagnosis type of the backup power supply after the detection process is completed is calibrated, and based on the system parameter changes, the battery health degree of the backup power supply is calculated.

7. The method of claim 6, wherein, The expression for calculating the state of health of the battery of the backup power supply is: In the formula, S oh represents the battery health degree; u b_st represents the lowest value of the battery voltage in the backup power supply during the detection process; u bl_lim represents the lower limit value of the battery voltage in the backup power supply; w st represents the energy release value during the detection process; u b_rat represents the battery voltage rating within the backup power supply; w rat represents the energy release criterion value in a single detection.

8. A backup power supply health state diagnosis control system for implementing the backup power supply health state diagnosis control method according to any one of claims 1 to 7, characterized by, The system comprises: An instruction detection module for real-time monitoring of detection instructions of the backup power supply in the normal operation process of the variable pitch system, wherein the detection instructions comprise external detection instructions and self-detection instructions; A state monitoring module for, after the variable pitch system receives the detection instructions, triggering the blade detection condition, starting to monitor the system parameters of the variable pitch system, and calculating the real-time output of the backup power supply; The diagnostic control module is configured to evaluate the health diagnosis type and the battery health of the backup power supply based on the monitored system parameters and the calculation result, and to issue a control instruction of the variable pitch system.

9. The system of claim 8, wherein the system is configured to: The instruction detection module comprises an external detection submodule and a self-detection submodule. The external detection submodule is configured to monitor an external detection instruction initiated by the main control in real time during the operation of the variable pitch system. The self-detection submodule is configured to monitor the running state of the variable pitch system in real time, and to initiate a self-detection instruction if the running state meets a fault triggering condition.

10. The system of claim 8, wherein the system is configured to: The state monitoring module comprises a power switching submodule, a parameter monitoring submodule and an output calculation submodule. The power switching submodule is configured to disconnect the main power supply of the variable pitch system and start the backup power supply only when the blade runs to a detection start angle based on the detection instruction received by the variable pitch system. The parameter monitoring submodule is configured to monitor system parameters in real time when the variable pitch system is powered by the backup power supply, wherein the system parameters comprise a DC bus voltage, a motor voltage, a motor current, a variable pitch angle and a detection time. The output calculation submodule is configured to calculate the real-time output of the backup power supply based on the motor power and energy loss of the variable pitch system.

11. The system of claim 10, wherein the system is configured to: 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 represents the motor power of the pitch motor; P loss represents the energy loss of the pitch motor; u m Vline represents the line voltage of the pitch motor power input; i represents the line current of the variable pitch motor power input; t represents the detection time of the variable pitch system; cosφ represents the power factor of the variable pitch motor.

12. The system of claim 8, wherein the system is configured to: The diagnostic control module comprises a voltage diagnosis submodule, an output diagnosis submodule, an angle diagnosis submodule and a health degree evaluation submodule. The voltage diagnosis submodule is configured to determine that the backup power supply is abnormal when the monitored bus DC voltage is lower than a voltage limit value, trigger a fault, and the variable pitch system restores the main power supply and stops running. The output diagnosis submodule is configured to determine that the backup power supply is normal when the real-time output of the backup power supply is greater than a set output value, and the variable pitch system restores the main power supply and runs normally. The angle diagnosis submodule is configured to determine that the backup power supply detection is not completed when the variable pitch angle runs to a detection stop angle or exceeds the detection time, and the variable pitch system restores the main power supply and warns running. The health degree evaluation submodule is configured to determine the health diagnosis type of the backup power supply after the detection process based on the determination result of the system parameters, and to calculate the battery health of the backup power supply based on the change of the system parameters.

13. The backup power supply health state diagnostic control system of claim 12, wherein, The expression for calculating the state of health of the battery of the backup power supply is: In the formula, S oh represents the battery health degree; u b_st represents the lowest value of the battery voltage in the backup power supply during the detection process; u bl_lim represents the lower limit value of the battery voltage in the backup power supply; w st represents the energy release value during the detection process; u b_rat represents the battery voltage rating within the backup power supply; w rat represents the energy release criterion value in a single detection.

14. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that, The processor executes the computer program to realize the steps of the method of any one of claims 1 to 7.

15. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the method of any one of claims 1 to 7.

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