A wind power system communication loss safety protection method and system

Abstract

This invention discloses a method and system for protecting against communication loss in wind power systems. The method includes the following steps: detecting whether communication between components in the wind power system is interrupted; wherein the communication between components includes communication between the PLC CPU and the I / O board, communication between the I / O board and the converter, communication between the I / O board and the pitch system, and communication between the I / O board and the yaw system; and, based on the safety level of each component in the wind power system, adopting corresponding control modes for different communication interruption points to reasonably maintain the wind turbine's state; wherein the safety levels of the pitch system, converter, and yaw system are arranged from high to low. This invention adopts different fault protection strategies for communication interruptions of different components to reasonably maintain the wind turbine's state, preventing further escalation of the fault without losing wind turbine power generation, providing comprehensive protection and being easy to operate.

Description

Technical Field

[0001] This invention mainly relates to the field of wind power technology, specifically to a method and system for protecting the security of communication loss in wind power systems. Background Technology

[0002] In wind power systems where PLC modules have been replaced with I / O boards, the entire system comprises wind turbine I / O boards, the PLC's CPU, converters, pitch control systems, and yaw systems. These components interact and coordinate control using different communication methods. In the event of a communication interruption, these components must coordinate accurately to maintain the turbine's state and provide timely protection or locking, aiming to prevent power generation loss while avoiding further escalation of the fault. However, existing communication loss handling measures involve direct shutdown without differentiating between the object of communication loss and the fault type. Indiscriminate shutdown upon communication loss results in power generation loss. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in view of the problems existing in the prior art, the present invention provides a wind power system communication loss security protection method and system that provides comprehensive protection and adopts different fault protection strategies for communication interruption of different components to reasonably maintain the state of the wind turbine.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0005] A method for secure protection against communication loss in a wind power system, characterized by comprising the following steps:

[0006] Detect whether the communication between the components in the wind power system is interrupted; the communication between the components includes the communication between the PLC CPU and the I / O board, the communication between the I / O board and the converter, the communication between the I / O board and the pitch system, and the communication between the I / O board and the yaw system;

[0007] Based on the safety level of each component in the wind power system, corresponding control modes are adopted for different communication interruption points to reasonably maintain the wind turbine status; among them, the safety levels of the pitch system, converter and yaw system are arranged from high to low.

[0008] Preferably, after detecting a communication interruption between the PLC's CPU and the I / O board, the CPU data value of the PLC before the communication interruption is maintained in the I / O board to briefly maintain control over the converter, pitch system, and yaw system, while waiting for communication to recover automatically. If communication is restored within a first preset time, the I / O board receives the CPU data from the PLC again and forwards it to the converter, pitch system, and yaw system, and control is returned to the PLC's CPU. If communication is not restored within the first preset time, the control data of the PLC is set to shutdown mode in the I / O board, causing the converter to stop, the pitch system to retract, and the yaw system to lock.

[0009] Preferably, the first preset time is 400-600ms.

[0010] Preferably, when an interruption in communication between the I / O board and the converter is detected, while communication between the I / O board and the pitch and yaw systems is normal, the converter can independently complete control without the PLC within a second preset time and maintain power output; if communication is restored within the second preset time, the PLC regains control of the converter; otherwise, the I / O board considers communication to be completely lost and informs the PLC to perform a shutdown.

[0011] Preferably, the second preset time is 400-600ms.

[0012] Preferably, when a communication interruption between the IO board and the pitch system is detected, a DO signal is directly output on the corresponding IO board to trigger the wind turbine safety chain and cause the wind turbine to shut down in an emergency.

[0013] Preferably, two DO signals are directly output to trigger the wind turbine safety chain.

[0014] Preferably, when a communication interruption is detected between the IO board and the yaw system, but the communication between the IO board and the converter and the pitch system is normal, the yaw system will be decoupled from the PLC and independently control the system within a third preset time, waiting for communication to be restored. After communication is restored, the control of the yaw system will be returned to the PLC, and the wind turbine will resume normal operation. If communication is not restored after the third preset time, it is considered that communication has been completely lost, and the IO board will notify the PLC to perform a shutdown.

[0015] Preferably, the third preset time is 3 to 8 minutes.

[0016] Preferably, the PLC CPU communicates with the I / O board via EtherCAT; the communication between the I / O board and the converter, pitch system, and yaw system is all via CAN communication.

[0017] This invention also discloses a communication loss security protection system for wind power systems, comprising:

[0018] The detection unit is used to detect whether the communication between various components in the wind power system is interrupted; the communication between various components includes the communication between the PLC CPU and the I / O board, the communication between the I / O board and the converter, the communication between the I / O board and the pitch system, and the communication between the I / O board and the yaw system.

[0019] The control unit is used to take corresponding control modes for different communication interruption points according to the safety level of each component in the wind power system in order to reasonably maintain the wind turbine status; among them, the safety levels of the pitch system, converter and yaw system are arranged from high to low.

[0020] The present invention further discloses a wind power system, including a PLC, a pitch system, a converter, a yaw system, multiple I / O boards, and a wind power system communication loss safety protection system as described above. Each I / O board corresponds one-to-one with the pitch system, the converter, and the yaw system. The PLC is connected to the pitch system, the converter, and the yaw system through the corresponding I / O boards.

[0021] The present invention also discloses a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when run by a processor, performs the steps of the wind power system communication loss security protection method as described above.

[0022] The present invention further discloses a computer device, including a memory and a processor, wherein the memory stores a computer program, and the computer program, when run by the processor, executes the steps of the wind power system communication loss security protection method as described above.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] The wind power system communication loss safety protection method of the present invention differentiates between different fault protection strategies for communication loss in different parts according to the level of safety. Specifically, after communication loss with the pitch system, a direct emergency shutdown is adopted; after communication loss with the converter or yaw system, a short-term independent control shutdown is adopted. In the case of short-term communication interruption and normal recovery, the wind turbine will not stop, the wind turbine status is reasonably maintained, and timely protection or locking is carried out to prevent the wind turbine from generating electricity and to avoid further expansion of the fault. The above protection method is comprehensive and easy to operate.

[0025] The wind power system communication loss safety protection method of the present invention directly outputs two DO signals in the corresponding IO board to trigger the wind turbine safety chain when the CAN communication between the IO board and the pitch system is interrupted. Even if one DO signal is abnormal, the other can still operate normally, thus ensuring system safety. Attached Figure Description

[0026] Figure 1 This is a flowchart of the method of the present invention in an embodiment.

[0027] Figure 2 This is a topology diagram of the system of the present invention in an embodiment. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, the wind power system communication loss security protection method of this embodiment includes the following steps:

[0030] This system detects whether communication between components in the wind power system is interrupted. These components include a PLC, converter, pitch system, yaw system, and I / O board. The start-up and shutdown control of the entire wind turbine is dominated by the PLC's CPU. After receiving control data from the PLC, the I / O board forwards it to the converter, pitch system, and yaw system. The communication between these components includes communication between the PLC's CPU and the I / O board, communication between the I / O board and the converter, communication between the I / O board and the pitch system, and communication between the I / O board and the yaw system. Specifically, the PLC's CPU and the I / O board use EtherCAT communication, while the I / O board uses CAN communication with the converter, pitch system, and yaw system.

[0031] Based on the safety levels of each component in the wind power system, corresponding control modes are adopted for different communication interruption points to reasonably maintain the wind turbine status. The safety levels of the pitch system, converter, and yaw system are arranged from high to low. The pitch system has the highest safety level, and a direct emergency shutdown is adopted after communication loss with the pitch system. The converter has a medium safety level, and a short-term independent control followed by shutdown is adopted after communication loss with the converter. The shutdown method for communication loss of the yaw system is the same as that of the converter. However, because the yaw system has the lowest safety level, the allowed independent control time is longer than that of the converter.

[0032] The wind power system communication loss safety protection method of the present invention differentiates between different fault protection strategies for communication loss in different parts according to the level of safety. Specifically, after communication loss with the pitch system, a direct emergency shutdown is adopted; after communication loss with the converter or yaw system, a short-term independent control shutdown is adopted. In the case of short-term communication interruption and normal recovery, the wind turbine will not stop, the wind turbine status is reasonably maintained, and timely protection or locking is carried out to prevent the wind turbine from generating electricity and to avoid further expansion of the fault. The above protection method is comprehensive and easy to operate.

[0033] In one specific embodiment, life signal data is added to both EtherCAT and CAN communication data to determine whether communication has been interrupted, making the detection simple and reliable.

[0034] In one specific embodiment, when an EtherCAT communication interruption is detected, the PLC's data cannot be transmitted normally to the I / O board, thus losing real-time control over the converter, pitch system, and yaw system. By maintaining the PLC's data values ​​before the communication interruption in the I / O board, control over the converter, pitch system, and yaw system is temporarily maintained while waiting for EtherCAT communication to recover automatically. If communication is restored within a first preset time (e.g., 500ms), the I / O board resumes receiving CPU data from the PLC and forwards it to the converter, pitch system, and yaw system, returning control to the PLC's CPU. If communication is not restored after 500ms, the I / O board sets the PLC's control data to shutdown mode, thereby stopping the converter, retracting the pitch system, locking the yaw system, and outputting a fault message to the user for maintenance. Of course, the aforementioned first preset time can be selected according to actual conditions.

[0035] In one specific embodiment, when a CAN communication interruption is detected between the I / O board and the converter, but the CAN communication between the I / O board and the pitch and yaw systems is normal, the data forwarded by the I / O board from the PLC cannot be transmitted to the converter normally, resulting in a loss of real-time control over the converter. However, the I / O board can still control the pitch and yaw systems. For a short period, the converter can operate independently of the PLC, maintaining power output. If CAN communication is restored within a second preset time (e.g., 500ms), the PLC regains control of the converter; otherwise, the I / O board considers communication completely lost, instructs the PLC to shut down the system, and outputs a fault message to the user for maintenance. Of course, the second preset time can be selected according to actual conditions.

[0036] In one specific embodiment, when an interruption in CAN communication between the I / O board and the pitch system is detected, the I / O board directly outputs two DO signals (digital signals) to trigger the wind turbine safety chain (using a redundant design, triggering if one of the two signals is output), causing an emergency shutdown of the wind turbine. This emergency shutdown employs a redundant design, using two DO signals for triggering, so that if one signal malfunctions, the other can still operate normally, ensuring system safety. The wind turbine safety chain refers to the safety chain system protecting the wind turbine generator set, designed to ensure that the wind power equipment remains in a safe state even in the event of a fault.

[0037] In one specific embodiment, when the CAN communication between the I / O board and the yaw system is interrupted, but communication with the converter and pitch system is normal, the yaw system will independently control itself from the PLC within a third preset time (e.g., 5 minutes), waiting for the CAN communication to be restored. Once communication is restored, control of the yaw system will be returned to the PLC, and the wind turbine will resume normal operation. If communication is not restored after 5 minutes, it is considered that communication has been completely lost, the I / O board will notify the PLC to perform a shutdown and output a fault message to the user for maintenance. Of course, the aforementioned second preset time can also be selected according to the actual situation.

[0038] This invention also discloses a communication loss security protection system for wind power systems, comprising:

[0039] The detection unit is used to detect whether the communication between various components in the wind power system is interrupted; the communication between various components includes the communication between the PLC CPU and the I / O board, the communication between the I / O board and the converter, the communication between the I / O board and the pitch system, and the communication between the I / O board and the yaw system.

[0040] The control unit is used to take corresponding control modes for different communication interruption points according to the safety level of each component in the wind power system in order to reasonably maintain the wind turbine status; among them, the safety levels of the pitch system, converter and yaw system are arranged from high to low.

[0041] The wind power system communication loss security protection system of the present invention, corresponding to the protection method described above, also has the advantages described above.

[0042] The present invention further discloses a wind power system, including a PLC, a pitch system, a converter, a yaw system, multiple I / O boards, and a wind power system communication loss safety protection system as described above. Each I / O board corresponds one-to-one with the pitch system, the converter, and the yaw system. The PLC is connected to the pitch system, the converter, and the yaw system through the corresponding I / O board.

[0043] This invention also discloses a computer-readable storage medium storing a computer program thereon. When executed by a processor, the computer program performs the steps of the wind power system communication loss security protection method described above. This invention further discloses a computer device including a memory and a processor. The memory stores a computer program, which, when executed by a processor, performs the steps of the wind power system communication loss security protection method described above. This invention can implement all or part of the processes in the methods of the above embodiments, or it can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. Memory can be used to store computer programs and / or modules. The processor performs various functions by running or executing the computer programs and / or modules stored in the memory, and by accessing data stored in the memory. Memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital cards (SD cards), flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0044] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method for secure protection against communication loss in a wind power system, characterized in that, Including the following steps: Detect whether the communication between the components in the wind power system is interrupted; the communication between the components includes the communication between the PLC CPU and the I / O board, the communication between the I / O board and the converter, the communication between the I / O board and the pitch system, and the communication between the I / O board and the yaw system; Based on the safety level of each component in the wind power system, corresponding control modes are adopted for different communication interruption points to reasonably maintain the wind turbine status; among them, the safety levels of the pitch system, converter and yaw system are arranged from high to low. Upon detecting a communication interruption between the PLC's CPU and the I / O board, the I / O board maintains the PLC's CPU data values ​​from before the communication interruption, briefly preserving control of the converter, pitch system, and yaw system while waiting for communication to resume automatically. If communication is restored within a first preset time, the I / O board resumes receiving the PLC's CPU data and forwards it to the converter, pitch system, and yaw system, returning control to the PLC's CPU. If communication is not restored within the first preset time, the I / O board sets the PLC's control data to shutdown mode, causing the converter to stop, the pitch system to retract, and the yaw system to lock. When an interruption in communication between the I / O board and the converter is detected, but communication between the I / O board and the pitch and yaw systems is normal, the converter will independently complete control without the PLC within a second preset time and maintain power output. If communication is restored within the second preset time, the PLC will regain control of the converter. Otherwise, the I / O board will consider the communication to be completely lost and notify the PLC to perform a shutdown. When a communication interruption between the IO board and the pitch system is detected, the corresponding DO signal is directly output in the IO board to trigger the wind turbine safety chain and shut down the wind turbine in an emergency. When a communication interruption is detected between the I / O board and the yaw system, but the communication between the I / O board and the converter and pitch system is normal, the yaw system will be decoupled from the PLC and independently controlled within a third preset time, waiting for communication to be restored. Once communication is restored, the control of the yaw system will be returned to the PLC, and the wind turbine will resume normal operation. If communication is not restored after the third preset time, it is considered that communication has been completely lost, and the I / O board will notify the PLC to perform a shutdown.

2. The wind power system communication loss security protection method according to claim 1, characterized in that, The first preset time is 400-600ms.

3. The wind power system communication loss security protection method according to claim 1, characterized in that, The second preset time is 400-600ms.

4. The wind power system communication loss security protection method according to claim 1, characterized in that, Two DO signals are directly output to trigger the wind turbine safety chain.

5. The wind power system communication loss security protection method according to claim 1, characterized in that, The third preset time is 3 to 8 minutes.

6. The wind power system communication loss security protection method according to any one of claims 1 to 3, characterized in that, The PLC's CPU communicates with the I / O board via EtherCAT; the I / O board communicates with the converter, pitch system, and yaw system via CAN.

7. A wind power system communication loss security protection system, used to execute the steps of the wind power system communication loss security protection method as described in any one of claims 1-6, characterized in that, include: The detection unit is used to detect whether the communication between various components in the wind power system is interrupted; the communication between various components includes the communication between the PLC CPU and the I / O board, the communication between the I / O board and the converter, the communication between the I / O board and the pitch system, and the communication between the I / O board and the yaw system. The control unit is used to take corresponding control modes for different communication interruption points according to the safety level of each component in the wind power system in order to reasonably maintain the wind turbine status; among them, the safety levels of the pitch system, converter and yaw system are arranged from high to low.

8. A wind power system, comprising a PLC, a pitch system, a converter, a yaw system, and multiple I / O boards, wherein each I / O board corresponds one-to-one with the pitch system, the converter, and the yaw system, and the PLC is connected to the pitch system, the converter, and the yaw system through corresponding I / O boards; characterized in that, It also includes the wind power system communication loss security protection system as described in claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is run by the processor, it executes the steps of the wind power system communication loss security protection method as described in any one of claims 1 to 6.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the computer program is run by the processor, it executes the steps of the wind power system communication loss security protection method as described in any one of claims 1 to 6.

Images