Intelligent lightning protection system for fan blade de-icing control equipment

Abstract

The embodiment of the application discloses an intelligent lightning protection system for a fan blade deicing control device, which comprises a lightning protection system body, a system state monitoring system and a comprehensive intelligent lightning protection management system, the lightning protection system body is composed of a grounding module, a shielding module and a surge protection module, and plays a basic guarantee role for the comprehensive intelligent lightning protection management system; the system state monitoring system is composed of a lightning discharge detection module and a surge protector state monitoring module, and plays an auxiliary support role for the comprehensive intelligent lightning protection management system; the comprehensive intelligent lightning protection management system is used for realizing man-machine interaction of lightning protection equipment and operation and maintenance personnel, and providing decision reference for daily operation, maintenance and management of the fan blade deicing control system. The application fully considers the actual operation environment of the fan, and proposes a lightning protection design scheme, and has the advantages of large lightning protection protection margin, strong system state sensing capability and fast fault monitoring and early warning speed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind turbine deicing, lightning protection and disaster reduction, and more particularly to an intelligent lightning protection system for a wind turbine blade deicing control device. BACKGROUND

[0002] With the continuous expansion of the installed capacity of wind power in China, a large number of wind turbines are built in heavy icing areas, and the blades of the wind turbines in this area are prone to icing in winter. Blade icing increases the load of the blade and the main shaft of the wind turbine, changes the airfoil of the blade, and directly leads to the decrease of the service life of related parts and the decrease of the expected output, which seriously affects the safe and reliable operation of the wind turbine system. Active deicing methods such as electric heating and gas heating are one of the available deicing methods for wind turbine blades, but the control equipment is often installed in the blade, hub and nacelle, which is directly exposed to the lightning electromagnetic field near the original grounding down conductor of the wind turbine, and the risk of lightning failure is very high.

[0003] At present, the mainstream lightning protection design method is to install a surge protection device (SPD) at the interface of the lightning protection area. This method has limited protection capability, high failure rate, high maintenance cost, and lacks system state monitoring. SUMMARY

[0004] To solve the above at least one technical problem, the purpose of the present application is to provide an intelligent lightning protection system for a wind turbine blade deicing control device, comprising: a lightning protection system body, a system state monitoring system and a comprehensive intelligent lightning protection management system;

[0005] The lightning protection system body is composed of a grounding module, a shielding module and a surge protection module, and plays a basic guarantee role for the comprehensive intelligent lightning protection management system;

[0006] The system state monitoring system is composed of a lightning discharge detection module and a surge protection device state monitoring module, and plays an auxiliary support role for the comprehensive intelligent lightning protection management system;

[0007] The comprehensive intelligent lightning protection management system is used to realize the man-machine interaction of lightning protection equipment and operation and maintenance personnel, and provides decision reference for the daily operation, maintenance and management of the wind turbine blade deicing control system.

[0008] In this scheme, the grounding module is used to periodically acquire the grounding resistance value of the wind turbine, and to judge whether the grounding resistance value of the wind turbine is less than a preset first resistance value. If yes, the deicing control system adopts a nearby grounding design method; if not, the deicing control system adopts an independent grounding down design method.

[0009] In this scheme, the shielding module includes a copper mesh woven shielding line, a double-layer shielding line and a metal bellows;

[0010] The copper mesh woven shielding line is used for connecting the cabin equipment to the hub equipment.

[0011] The double-layer shielding line is used for connecting the hub and the blade equipment.

[0012] The metal bellows is used for sleeving the communication cable.

[0013] In the scheme, the surge protection module comprises: a system power loop lightning protector, and a surge protection device with a nominal discharge current of not less than 20 kA is selected; a cabin-to-hub interface control loop lightning protector, and a surge protection device with a nominal discharge current of not less than 10 kA is selected; and a blade-to-hub interface control loop lightning protector, and a surge protection device with a nominal discharge current of not less than 20 kA is selected.

[0014] In the scheme, the surge protection device is arranged at the junction of all interfaces, that is, the surge protection device is arranged on the incoming line and the outgoing line of the single cabinet body.

[0015] In the scheme, the system state monitoring system is used for acquiring the lightning stroke data information and the lightning protection equipment health data information of the fan blade deicing control equipment in real time.

[0016] In the scheme, the system state monitoring system is further used for: determining the lightning stroke frequency value of the corresponding fan according to the lightning stroke data information of the fan blade deicing control equipment, judging whether the lightning stroke frequency value of the fan is greater than a preset lightning stroke frequency threshold value, and if yes, generating maintenance warning information of the corresponding fan.

[0017] In the scheme, the system state monitoring system is further used for: obtaining the lightning current peak value, polarity, discharge frequency, residual voltage and temperature and humidity data according to the lightning protection equipment health data information; comprehensively analyzing the lightning current peak value, polarity, discharge frequency, residual voltage and temperature and humidity data to obtain a health state index of the surge protection device; generating warning information of the surge protection device when the health state index of the surge protection device is less than a preset health state index threshold value; and sending the warning information of the surge protection device to the comprehensive intelligent lightning protection management system for display.

[0018] The step of comprehensively analyzing the lightning current peak value, polarity, discharge times, residual voltage, temperature and humidity data to obtain the health state index of the surge protector specifically comprises: constructing a criterion layer according to the lightning current peak value, polarity, discharge times, residual voltage and temperature and humidity; setting C1, C2, C3 and C4 respectively, comparing the criterion layer in pairs to obtain the weight coefficients of the four criterion layers; constructing a sub-criterion layer of C1 and C4, and determining the weight coefficients of the sub-criterion layer; determining the weight coefficient of each index according to the weight coefficients of the criterion layer and the weight coefficients of the sub-criterion layer; scoring the index value based on a preset scoring function to obtain an index score value; multiplying the index score value by the weight coefficient of the corresponding index to obtain the health index of the corresponding index; and accumulating the health indexes of different indexes to obtain the health state index of the SPD.

[0019] In the scheme, the comprehensive intelligent lightning protection management system is used for real-time display of system monitoring information, repair and inspection warning information of the fan and warning information of the surge protector; and providing maintenance and repair suggestions for the current warning information according to historical processing schemes.

[0020] The intelligent lightning protection system for the fan blade deicing control equipment disclosed in the application fully considers the actual operation environment of the fan, and provides a lightning protection design scheme, and has the advantages of large lightning protection protection margin, strong system state sensing capability and fast fault monitoring and early warning speed.

[0021] Other features and advantages of the embodiments of the application will be described in detail in the following specific implementation part. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the embodiments of the application, and constitute a part of the specification, and are used together with the following specific implementation to explain the embodiments of the application, but do not constitute a limitation on the embodiments of the application. In the drawings:

[0023] Figure 1 It is a structural schematic diagram of the intelligent lightning protection system for the fan blade deicing control equipment;

[0024] Figure 2 It is a shielding module design schematic diagram;

[0025] Figure 3 It is a surge protector point design schematic diagram;

[0026] Figure 4 It is a schematic diagram of the criterion layer judgment matrix. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0028] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details, other than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed herein.

[0029] Figure 1 The structural schematic diagram of the intelligent lightning protection system for the deicing control device of the fan blade.

[0030] As Figure 1 shown, the present application provides an intelligent lightning protection system for a deicing control device of a fan blade, comprising: a lightning protection system body, a system state monitoring system and a comprehensive intelligent lightning protection management system;

[0031] The lightning protection system body is composed of a grounding module, a shielding module and a surge protection module, and plays a basic guarantee role for the comprehensive intelligent lightning protection management system;

[0032] The system state monitoring system is composed of a lightning discharge detection module and a surge protector state monitoring module, and plays an auxiliary support role for the comprehensive intelligent lightning protection management system;

[0033] The comprehensive intelligent lightning protection management system is used to realize the man-machine interaction of lightning protection equipment and operation and maintenance personnel, and provides decision reference for the daily operation, maintenance and management of the deicing control system of the fan blade.

[0034] According to the embodiment of the present application, the grounding module is used to periodically acquire the grounding resistance value of the wind turbine; and it is judged whether the grounding resistance value of the wind turbine is less than a preset first resistance value, if yes, the deicing control system adopts a nearby grounding design method; if not, the deicing control system adopts an independent grounding down design method.

[0035] It should be noted that the grounding module in the lightning protection system body has fully considered the actual grounding resistance value working condition of the wind turbine itself, for example, if the preset first resistance value is 6 ohms, the deicing control system adopts the nearby grounding design method under the condition that the wind turbine grounding resistance is good (R<6 ohms), that is, the hub equipment is connected to the hub metal, the cabin equipment is connected to the original grounding copper bar of the fan, and the blade grounding wire is connected to the hub metal through a cross section not less than 10mm 2 In the case of poor wind turbine grounding resistance (R>6 ohms), the deicing control system adopts the independent grounding down design method, that is, a cross section not less than 10mm 2The ground ring channel, the hub inner blade inner equipment ground point is gathered, and then the ground ring channel is connected to the cabin ground through the slip ring, and finally the independent grounding down lead is connected to the ground.

[0036] Figure 2 The shielding module is designed as shown in the schematic diagram.

[0037] As shown in the schematic diagram, the shielding module comprises a copper mesh woven shielding wire, a double-layer shielding wire and a metal bellows. Figure 2

[0038] The copper mesh woven shielding wire is used for connecting the cabin equipment to the hub equipment.

[0039] The double-layer shielding wire is used for the equipment between the hub and the blade.

[0040] The metal bellows is used for sleeving outside the communication cable.

[0041] It should be noted that the cable for connecting the cabin equipment to the hub equipment adopts the copper mesh woven shielding wire, and the shielding layer is single-ended grounded at the cabin side. The equipment between the hub and the blade adopts the aluminum foil + copper mesh woven double-layer shielding wire, and the shielding layer is single-ended grounded at the hub side. In addition, the metal bellows is sleeved outside the communication cable for the interface, and the bellows is single-ended grounded at the hub side.

[0042] Figure 3 The surge protection device is designed as shown in the schematic diagram.

[0043] As shown in the schematic diagram, the surge protection module comprises: a system power loop lightning protector, a cabin-to-hub interface control loop lightning protector and a blade-to-hub interface control loop lightning protector. Figure 3 Preferably, the surge protection device is selected at the junction of all interfaces, that is, the surge protection device is arranged on the incoming line and the outgoing line of the single cabinet body.

[0044] According to the embodiment of the present application, the system state monitoring system is used for acquiring the lightning stroke data information and the lightning protection equipment health data information of the wind turbine blade deicing control equipment in real time.

[0045] According to the embodiment of the present application, the system state monitoring system is further used for: determining the lightning stroke number value of the corresponding wind turbine according to the lightning stroke data information of the wind turbine blade deicing control equipment, judging whether the lightning stroke number value of the wind turbine is greater than a preset lightning stroke number threshold value, and if yes, generating the repair and inspection warning information of the corresponding wind turbine.

[0046]

[0047] ​​According to the embodiment of the present application, the system state monitoring system is further configured to: obtain lightning current peak value, polarity, discharge times, residual voltage, temperature and humidity data according to lightning protection equipment health data information; comprehensively analyze the lightning current peak value, polarity, discharge times, residual voltage, temperature and humidity data to obtain a health state index of the surge protection device; generate warning information of the surge protection device when the health state index of the surge protection device is less than a preset health state index threshold; and send the warning information of the surge protection device to the comprehensive intelligent lightning protection management system for display.

[0048] The step of comprehensively analyzing the lightning current peak value, polarity, discharge times, residual voltage, temperature and humidity data to obtain the health state index of the surge protection device specifically includes: constructing a criterion layer according to the lightning current peak value, polarity, discharge times, residual voltage and temperature and humidity; setting C1, C2, C3 and C4 respectively, comparing the criterion layer in pairs to obtain the weight coefficients of the four criterion layers; constructing a sub-criterion layer of C1 and C4 to determine the weight coefficients of the sub-criterion layer; determining the weight coefficient of each index according to the weight coefficients of the criterion layer and the weight coefficients of the sub-criterion layer; scoring the index values based on a preset scoring function to obtain index score values; multiplying the index score values by the weight coefficients of the corresponding indexes to obtain the health indexes of the corresponding indexes; and accumulating the health indexes of different indexes to obtain the health state index of the SPD.

[0049] It should be noted that the health state of the surge protection device is evaluated by using the analytic hierarchy process, a criterion layer is constructed, and the criterion layer includes C1, C2, C3 and C4, wherein C1 is lightning current stress including peak value and polarity, reflecting the intensity of single discharge; C2 is cumulative loss embodied by discharge times, reflecting the total amount of historical work; C3 is performance degradation embodied by residual voltage, reflecting the direct output of the core performance of the SPD (surge protection device); and C4 is environmental factors including temperature and humidity, affecting the aging speed of SPD elements; a judgment matrix is constructed according to the four factors in the criterion layer, as shown in Figure 4 The importance of C3 (performance) relative to C1 (stress) is 3, so the C3 row C1 column is 3 and the C1 row C3 column is 1 / 3; the weight coefficients of the four criteria are calculated by using the summation method: , and the calculation formula is: , wherein represents the weight coefficient of the xth criterion, wherein i and j represent the row and column numbers in the corresponding judgment matrix, such as ; judgment matrix B1 and B4 are constructed for the sub-criterion layer, wherein the judgment matrix B1 is the judgment matrix of S1 (peak value) and S2 (polarity) in C1, and the matrix B1 is: ; the judgment matrix B4 is the judgment matrix of S3 (temperature) and S4 (humidity) in C4, and the matrix B4 is: , the weight coefficient of the corresponding sub-criterion layer is calculated according to the summation method, and the weight coefficient of the corresponding sub-criterion layer is obtained ; when the weight coefficient of the sub-criterion layer exists, the weight coefficient of the index is equal to the weight coefficient of the criterion layer to which the corresponding index belongs multiplied by the weight coefficient of the sub-criterion layer to which the corresponding index belongs, and when the weight coefficient of the sub-criterion layer does not exist, the weight coefficient of the index is equal to the weight coefficient of the criterion layer to which the corresponding index belongs, such as the weight coefficient of the peak value (S1) , the weight coefficient of the discharge times C2 , the weight coefficient of the humidity S4 .

[0050] It should be noted that a scoring function S(x) is defined for each index: the higher the lightning current peak value, the less healthy it is, and the scoring function is set to , wherein I is the impulse current borne by the SPD, is the maximum bearable impulse current of the SPD (which can be obtained from the specification book). If the impulse current exceeds , the score is 0. The lightning polarity is represented as a discrete value, wherein the positive polarity is usually more harmful, and therefore, when it is negative, the corresponding scoring function is set to S(P)=1.0, and when it is positive, the corresponding scoring function is set to S(P)=0.7; the more the discharge times, the less healthy it is, and its scoring function is positioned as , wherein N is the discharge times of the SPD, is the nominal discharge times life of the SPD, and if the discharge times exceed , the score is 0; wherein the higher the residual voltage value ratio, the less healthy it is, and the residual voltage value / initial residual voltage value of each discharge is measured, and the larger the ratio, the more serious the performance degradation, , ( , S(U)=0). Among them, U represents the measured residual voltage, represents the initial residual voltage; wherein the farther the temperature (T) and humidity (H) deviate from the ideal range, the less healthy it is, and the scoring is performed through a piecewise function, , .

[0051] Further, according to the health state index, a health state level is divided, wherein when the health state index is greater than or equal to 0.8, the SPD is set as healthy, indicating that all indexes are good, and the SPD can continue to be used; when the health state index is less than 0.8 and greater than or equal to 0.6, the SPD is set as attention, indicating that some indexes begin to deteriorate, and need to be monitored; when the health state index is less than 0.6 and greater than or equal to 0.4, the SPD is set as warning, indicating that the performance of the SPD obviously decreases, the risk is high, and the SPD is maintained according to a normal maintenance plan; and when the health state index is less than 0.4, the SPD is set as dangerous, indicating that the current SPD has failed or is about to fail, and must be immediately replaced, and the SPD cannot provide effective protection, and the preset health state index threshold is 0.6.

[0052] According to the embodiment of the application, the comprehensive intelligent lightning protection management system is used for real-time display of system monitoring information, fan maintenance warning information and surge protector warning information, and providing maintenance and repair suggestions for current warning information according to historical processing schemes.

[0053] It should be noted that the comprehensive intelligent lightning protection management system can display system monitoring information in real time and online, has data processing function and intelligent suggestion function. Users can intuitively view system state on the main control interface. The fan lightning connection times and surge protector health state information have data storage, data clustering and data correlation analysis functions. According to the analysis result, maintenance and repair suggestions are provided for decision reference of operation and maintenance personnel.

[0054] The application discloses an intelligent lightning protection system for a wind turbine blade deicing control device, which fully considers the actual operation environment of the wind turbine, and provides a lightning protection design scheme, and has the advantages of large lightning protection protection margin, strong system state sensing capability and fast fault monitoring and early warning speed.

[0055] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other manners. The above-described device embodiments are only schematic. For example, the division of the units is only a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the above-described components can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0056] The units described as separate components above can or can not be physically separate, and the components shown as units can or can not be physical units; they can be located in one place or distributed on multiple network units; and part or all of the units can be selected to achieve the purposes of the embodiments according to actual needs.

[0057] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be realized in the form of hardware or in the form of hardware plus software functional units.

[0058] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware, and the aforementioned program can be stored in a computer readable storage medium, and the program executes the steps including the above-mentioned method embodiments when executed; and the aforementioned storage medium includes mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic discs or optical discs, and various storage media that can store program codes.

[0059] Alternatively, the integrated units of the present application, if implemented in the form of software functional modules and sold or used as independent products, can also be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products, and the computer software products are stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the methods described in the embodiments of the present application. The aforementioned storage medium includes mobile storage devices, ROMs, RAMs, magnetic discs or optical discs, and various storage media that can store program codes.

[0060] The above is only an embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. An intelligent lightning protection system for a wind turbine blade de-icing control device, characterized in that, The application relates to a lightning protection system, which comprises a lightning protection system body, a system state monitoring system and a comprehensive intelligent lightning protection management system. The lightning protection system body is composed of a grounding module, a shielding module and a surge protection module, and plays a basic guarantee role for the comprehensive intelligent lightning protection management system. The system state monitoring system is composed of a lightning discharge detection module and a surge protector state monitoring module, and plays an auxiliary support role for the comprehensive intelligent lightning protection management system. The comprehensive intelligent lightning protection management system is used for realizing man-machine interaction of lightning protection equipment and operation and maintenance personnel, and providing decision reference for daily operation, maintenance and management of a wind turbine blade deicing control system. The grounding module is used for periodically acquiring the grounding resistance of a wind turbine generator. The system state monitoring system is further used for obtaining lightning current peak value, polarity, discharge frequency, residual voltage and temperature and humidity data according to lightning protection equipment health data information; comprehensively analyzing the lightning current peak value, polarity, discharge frequency, residual voltage and temperature and humidity data to obtain a health state index of a surge protector; and generating warning information of the surge protector when the health state index of the surge protector is less than a preset health state index threshold. and determine whether the ground resistance of the wind turbine is less than a preset first resistance value. If yes, the de-icing control system adopts a nearby grounding design method, which includes connecting the hub-in equipment to the hub metal, connecting the cabin-in equipment to the original grounding copper bar of the fan, and connecting the blade-in grounding wire to the hub metal through a cross section not less than 10 mm 2 If no, the de-icing control system adopts an independent grounding down design method, which includes adding a grounding wire ring with a cross section not less than 10 mm 2 in the slip ring, collecting the blade-in equipment grounding wire in the hub into one point, then connecting to the cabin grounding wire through the slip ring, and finally connecting to the ground through the independent grounding down wire. The warning information of the surge protector is sent to the comprehensive intelligent lightning protection management system for display. The step of comprehensively analyzing the lightning current peak value, polarity, discharge frequency, residual voltage and temperature and humidity data to obtain the health state index of the surge protector specifically comprises the following steps: constructing a criterion layer according to lightning current stress, discharge frequency, residual voltage and temperature and humidity; setting the criterion layer as C1, C2, C3 and C4 respectively, comparing the criterion layer in pairs to obtain weight coefficients of the four criterion layers; constructing a sub-criterion layer of C1 and C4, wherein the lightning current stress comprises lightning current peak value and polarity, and the temperature and humidity comprise temperature and humidity; determining weight coefficients of the sub-criterion layer; determining weight coefficients of each index according to the weight coefficients of the criterion layer and the weight coefficients of the sub-criterion layer; scoring the index values based on a preset scoring function to obtain index score values; multiplying the index score values by the weight coefficients of the corresponding indexes to obtain health indexes of the corresponding indexes; and accumulating the health indexes of different indexes to obtain the health state index of the surge protector SPD. The shielding module comprises a copper mesh woven shielding wire, a double-layer shielding wire and a metal bellows.

2. The lightning protection system for the de-icing control equipment of a wind turbine blade according to claim 1, characterized in that, The copper mesh woven shielding wire is used for connecting cabin equipment to hub equipment. The double-layer shielding wire is used for connecting equipment between the hub and the blade. The metal bellows is used for penetrating outside a communication cable. The surge protection module comprises a system power loop lightning protector, a cabin-to-hub interface control loop lightning protector and a blade-to-hub interface control loop lightning protector.

3. The lightning protection system for the de-icing control equipment of a wind turbine blade according to claim 1, wherein, The surge protectors are arranged at the junctions of all interfaces, i.e. the surge protectors are arranged at the incoming lines and outgoing lines of the single cabinet.

4. The lightning protection system for the de-icing control equipment of a wind turbine blade according to claim 3, characterized in that, The system state monitoring system is used for acquiring lightning stroke data information and lightning protection equipment health data information of the wind turbine blade deicing control equipment in real time.

5. The lightning protection system for the de-icing control equipment of a wind turbine blade according to claim 1, wherein, ​ 6. The lightning protection system for the de-icing control equipment of a wind turbine blade according to claim 5, wherein, The system state monitoring system is further configured to determine a lightning strike number value of the corresponding fan according to lightning strike data information of the fan blade deicing control device, determine whether the lightning strike number value of the corresponding fan is greater than a preset lightning strike number threshold, and generate maintenance warning information of the corresponding fan if the lightning strike number value is greater than the preset lightning strike number threshold.

7. The lightning protection system for the de-icing control equipment of a wind turbine blade according to claim 1, wherein, The comprehensive intelligent lightning protection management system is a comprehensive man-machine interaction platform of a lightning protection system body and a system state monitoring system.

8. The lightning protection system for the de-icing control equipment of a wind turbine blade according to claim 7, characterized in that, The comprehensive intelligent lightning protection management system is further configured to: display system monitoring information, fan maintenance warning information and surge protector warning information in real time; provide maintenance opinions according to historical treatment schemes and current warning information.

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