A high-power wind turbine generator control method based on a localized PLC

Abstract

A kind of high-power wind turbine control method based on localization PLC, it includes: S1: central data processor reads unit operation history file from unit database, unit operation history file includes the historical failure data of unit and the ten-minute operation data of unit;S2: unit operation history file is split and cleaned, and the data of shutdown is eliminated;S3: from the historical failure data of unit, the occurrence frequency and occurrence time of each unit appearing overspeed, card paddle are counted;S4: according to the occurrence time of unit appearing overspeed, card paddle counted, the operation data of unit before and after corresponding time is inquired from the ten-minute operation data of unit and is carried out variable analysis;S5: central data processor transmits the key variable of each unit and variable operation threshold to the domestic PLC controller of unit, and the domestic PLC controller switches control according to the key variable of each unit and variable operation threshold the variable pitch strategy of unit.

Description

Technical Field

[0001] This invention relates to the field of wind turbine control, and more specifically, to a control method for high-power wind turbines based on a domestically produced PLC. Background Technology

[0002] The wind power industry has been developing on a large scale for more than a decade. Wind turbine manufacturers are also continuously increasing their investment in technological research and development and accelerating the localization process of wind turbine units. The localization rate of key components has reached more than 90%. However, PLC, as the core component of wind turbine units, has never been able to get rid of imported components.

[0003] The use of foreign PLC products poses a significant threat to the safety and controllability of wind turbine units. Key component technologies of PLC products, including critical components, embedded real-time operating systems, high-speed real-time communication networks, PLC operating engines, and programming configuration software, are all susceptible to vulnerability injection. The solution to eliminate such risks is to promote the localization of PLCs, ensure the independent controllability of the unit's control system, and lay a solid foundation for the reliable and stable operation of wind turbine units.

[0004] As wind turbines age, various components in the turbine hub experience aging and loosening, and pitch bearings suffer increased wear. This can lead to various propeller jamming faults, and in severe cases, even turbine runaway accidents. This phenomenon is caused by a variety of factors, such as high friction in the blade bearings, poor pitch lubrication systems, and power supply failures. Runaway will not occur if only one or both blades fail to retract. The primary cause of runaway is when the blades fail to feather to the stop position. In this state, the rotor is essentially facing the wind, intensifying wind energy absorption and causing the rotor speed to increase continuously, ultimately leading to an accident. Summary of the Invention

[0005] This invention provides a control method for high-power wind turbine generators based on domestically produced PLCs, in order to solve the aforementioned technical problems existing in the prior art.

[0006] To achieve the above objectives, this invention provides a control method for high-power wind turbine generators based on a domestically produced PLC, comprising:

[0007] S1: The central data processor reads the unit operation history file from the unit database. The unit operation history file includes the unit's historical fault data and the unit's ten-minute operation data.

[0008] S2: Split and clean the unit's historical operation files, removing data from when the unit was shut down;

[0009] S3: Statistically analyze the frequency and timing of overspeed and propeller jamming for each unit based on historical fault data.

[0010] S4: Based on the statistically determined times when the unit experienced overspeed and propeller jamming, query the unit's operating data before and after the corresponding times from the ten-minute operating data of the unit and perform variable analysis on it. First, remove variables that are not related to pitch and speed, then screen out the key variables related to propeller jamming and overspeed, and calculate the variable operating threshold of the key variables before the failure.

[0011] S5: The central data processor transmits the key variables and variable operating thresholds of each unit to the unit's domestic PLC controller. The domestic PLC controller switches the pitch strategy of the unit according to the key variables and variable operating thresholds of each unit.

[0012] The pitch strategy is as follows:

[0013] During normal operation, the unit employs a synchronous pitch control strategy, where all three pitch blades operate simultaneously at the same pitch angle.

[0014] When the key variables of the unit are detected to reach their corresponding operating thresholds, the pitch strategy of the unit is switched from synchronous pitch control to asynchronous pitch control:

[0015] (1) If the critical variable of one of the blades reaches the operating threshold of its corresponding variable, the blade is retraced by independent pitch control strategy, while the other two blades keep their original control angle unchanged until the critical variable of the blade returns to normal. Then the other two blades are controlled to run to the same pitch angle as the blade. After stabilizing for a period of time, the control strategy is switched to synchronous pitch control strategy.

[0016] (2) If the key variables of two blades reach their corresponding variable operating thresholds, the asynchronous pitch control strategy is used to perform pitch return operation on the two blades respectively until the two blades are running stably. Then, the pitch angles of all three blades are adjusted to be the same as those of the blade with the largest pitch angle. After a period of stabilization, the synchronous pitch control strategy is switched.

[0017] (3) If the key variables of the three blades all reach their corresponding variable operating thresholds, the control unit will retract the three blades to the stop position for hardware inspection.

[0018] In one embodiment of the present invention, the time span of the unit operation history file is from 5 to 10 years ago to the present.

[0019] In one embodiment of the present invention, in step S3, when the time of occurrence of overspeed and propeller jamming of each unit is counted, the time scale is accurate to the minute.

[0020] In one embodiment of the present invention, variables unrelated to pitch and speed include nacelle cabinet temperature and inverter-related data.

[0021] In one embodiment of the present invention, key variables related to propeller overspeed include blade friction and pitch torque.

[0022] In one embodiment of the present invention, the central data processing unit includes a wind turbine main controller and a main control program thereon.

[0023] In one embodiment of the present invention, the main controller of the wind turbine is a domestically produced Loongson 2K1000 processor.

[0024] The high-power wind turbine control method based on domestically produced PLC provided by this invention uses a domestically produced PLC controller as a platform and employs domestically produced chips to achieve all communication and operational functions between the turbine and the generator set. Based on these features, the domestically produced platform is more secure and reliable for national energy security. The accompanying main control program has been optimized from the original program, making the pitch strategy more flexible. Based on the analysis data results from the central data processor, it can freely switch between synchronous and asynchronous pitch strategies to avoid pitch return issues caused by turbine aging. Attached Figure Description

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

[0026] Figure 1 This is a flowchart illustrating the process of determining variable operating thresholds in a high-power wind turbine control method based on a domestically produced PLC, according to an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram illustrating a high-power wind turbine control method based on a domestically produced PLC according to an embodiment of the present invention, which performs pitch control based on key variables. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Figure 1This is a schematic diagram illustrating the process of determining variable operating thresholds in a high-power wind turbine control method based on a domestically produced PLC according to an embodiment of the present invention. Figure 2 This is a schematic diagram illustrating a high-power wind turbine control method based on a domestically produced PLC according to an embodiment of the present invention, which performs pitch control based on key variables. Figure 1 , Figure 2 As shown, the high-power wind turbine control method based on a domestically produced PLC provided by this invention includes:

[0030] S1: The central data processing unit reads the unit operation history file from the unit database. The unit operation history file includes the unit's historical fault data and the unit's ten-minute operation data. The time span of the unit operation history file is from 5 to 10 years ago to the present.

[0031] S2: Split and clean the unit's historical operation files, removing data from when the unit was shut down;

[0032] S3: Statistically analyze the frequency and timing of overspeed and propeller jamming for each unit based on historical fault data.

[0033] In step S3, when the time of overspeed and propeller jamming of each unit is recorded, the time scale is accurate to the minute to improve the calculation accuracy.

[0034] S4: Based on the statistically determined times when the unit experienced overspeed and propeller jamming, query the unit's operating data before and after the corresponding times from the ten-minute operating data of the unit and perform variable analysis on it. First, remove variables that are not related to pitch and speed, then screen out the key variables related to propeller jamming and overspeed, and calculate the variable operating threshold of the key variables before the failure.

[0035] Among them, variables that are not related to pitch and speed include, for example, nacelle cabinet temperature and inverter data, while key variables related to propeller jamming and overspeed include, for example, blade friction and pitch torque.

[0036] S5: The central data processor transmits the key variables and variable operating thresholds of each unit to the unit's domestic PLC controller. The domestic PLC controller switches the pitch strategy of the unit according to the key variables and variable operating thresholds of each unit.

[0037] The pitch strategy is as follows:

[0038] During normal operation, the unit employs a synchronous pitch control strategy, where all three pitch blades operate simultaneously at the same pitch angle.

[0039] When the key variables of the unit are detected to reach their corresponding operating thresholds, the pitch strategy of the unit is switched from synchronous pitch control to asynchronous pitch control:

[0040] (1) If the critical variable of one of the blades reaches the operating threshold of its corresponding variable, the blade is retraced by independent pitch control strategy, while the other two blades keep their original control angle unchanged until the critical variable of the blade returns to normal. Then the other two blades are controlled to run to the same pitch angle as the blade. After stabilizing for a period of time, the control strategy is switched to synchronous pitch control strategy.

[0041] (2) If the key variables of two blades reach their corresponding variable operating thresholds, the asynchronous pitch control strategy is used to perform pitch return operation on the two blades respectively until the two blades are running stably. Then, the pitch angles of all three blades are adjusted to be the same as those of the blade with the largest pitch angle. After a period of stabilization, the synchronous pitch control strategy is switched.

[0042] (3) If the key variables of the three blades all reach their corresponding variable operating thresholds, the control unit will retract the three blades to the stop position for hardware inspection.

[0043] When the blade is working normally, the key variables are within a normal range. When the blade's working state tends to be abnormal, the key variables will change toward the variable operating threshold. By using the variable operating threshold, we can predict in advance that the blade will be in an abnormal state.

[0044] In this embodiment, the central data processing unit includes a wind turbine main controller and a matching main control program. The wind turbine main controller is, for example, a domestic Loongson 2K1000 processor. The domestic PLC controller in this invention is, for example, an NJ series programmable controller produced by Nanjing Aotuo Technology Co., Ltd.

[0045] The high-power wind turbine control method based on domestically produced PLC provided by this invention uses a domestically produced PLC controller as a platform and employs domestically produced chips to achieve all communication and operational functions between the turbine and the generator set. Based on these features, the domestically produced platform is more secure and reliable for national energy security. The accompanying main control program has been optimized from the original program, making the pitch strategy more flexible. Based on the analysis data results from the central data processor, it can freely switch between synchronous and asynchronous pitch strategies to avoid pitch return issues caused by turbine aging.

[0046] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0047] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for high-power wind turbine generators based on domestically produced PLCs, characterized in that, include: S1: The central data processor reads the unit operation history file from the unit database. The unit operation history file includes the unit's historical fault data and the unit's ten-minute operation data. S2: Split and clean the unit's historical operation files, removing data from when the unit was shut down; S3: Statistically analyze the frequency and timing of overspeed and propeller jamming for each unit based on historical fault data. S4: Based on the statistically determined times when the unit experienced overspeed and propeller jamming, query the unit's operating data before and after the corresponding times from the ten-minute operating data of the unit and perform variable analysis on it. First, remove variables that are not related to pitch and speed, then screen out the key variables related to propeller jamming and overspeed, and calculate the variable operating threshold of the key variables before the failure. S5: The central data processor transmits the key variables and variable operating thresholds of each unit to the unit's domestic PLC controller. The domestic PLC controller switches the pitch strategy of the unit according to the key variables and variable operating thresholds of each unit. The pitch strategy is as follows: During normal operation, the unit employs a synchronous pitch control strategy, where all three pitch blades operate simultaneously at the same pitch angle. When the key variables of the unit are detected to reach their corresponding operating thresholds, the pitch strategy of the unit is switched from synchronous pitch control to asynchronous pitch control: (1) If the critical variable of one of the blades reaches the operating threshold of its corresponding variable, the blade is retraced by independent pitch control strategy, while the other two blades keep their original control angle unchanged until the critical variable of the blade returns to normal. Then the other two blades are controlled to run to the same pitch angle as the blade. After stabilizing for a period of time, the control strategy is switched to synchronous pitch control strategy. (2) If the key variables of two blades reach their corresponding variable operating thresholds, the asynchronous pitch control strategy is used to perform pitch return operation on the two blades respectively until the two blades are running stably. Then, the pitch angles of all three blades are adjusted to be the same as those of the blade with the largest pitch angle. After a period of stabilization, the synchronous pitch control strategy is switched. (3) If the key variables of the three blades all reach their corresponding variable operating thresholds, the control unit will retract the three blades to the stop position for hardware inspection.

2. The high-power wind turbine control method based on a domestically produced PLC according to claim 1, characterized in that, The time span of the unit's operational history files is from 5 to 10 years ago to the present.

3. The high-power wind turbine control method based on a domestically produced PLC according to claim 1, characterized in that, In step S3, when the time of overspeed and propeller jamming of each unit is recorded, the time scale is accurate to the minute.

4. The high-power wind turbine control method based on a domestically produced PLC according to claim 1, characterized in that, Variables unrelated to pitch and speed include nacelle cabinet temperature and inverter-related data.

5. The high-power wind turbine control method based on a domestically produced PLC according to claim 1, characterized in that, Key variables related to propeller jamming and overspeed include blade friction and pitch torque.

6. The high-power wind turbine control method based on a domestically produced PLC according to claim 1, characterized in that, The central data processing unit includes the main controller for the wind turbine and its supporting main control program.

7. The high-power wind turbine control method based on a domestically produced PLC according to claim 6, characterized in that, The main controller of the wind turbine is a domestically produced Loongson 2K1000 processor.

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