Wind driven generator braking method and system

Abstract

The invention discloses a wind driven generator braking method and system, and relates to the technical field of wind driven generators, and the method comprises the steps: carrying out the data collection of a wind power plant, and obtaining a wind speed data set, a rotating speed data set and an included angle data set; analyzing the wind speed data set, the rotating speed data set and the included angle data set to obtain an interaction relationship; acquiring current wind speed data and determining a current wind speed grade; if the current wind speed grade is the first grade, the braking system is adjusted based on the current wind speed data and the interaction relation; if the current wind speed grade is a second grade, the adjusting amount of the braking system is judged based on the current included angle data, the current wind speed data, the yaw adjusting rate and the interaction relation, and second adjusting amount data is obtained; and if the current wind speed grade is the third grade, the wind wheel direction of the wind motor is adjusted based on the yaw system, and brake system starting is conducted on the wind motor with the rotating speed being 0. The brake component has the effect of reducing the abrasion rate of the brake component.

Description

Technical Field

[0001] The present application relates to the technical field of wind turbines, and in particular to a wind turbine braking method and system. Background Art

[0002] Since wind turbines with different speeds have different production costs, and the faster the speed, the higher the production cost, the rated speed of wind turbines used in wind farms in different regions matches the average wind speed of the environment. When the wind speed of a wind farm changes and causes the speed of the wind turbine to exceed the rated speed, it will affect the wind turbine and accelerate the damage of the wind turbine. Therefore, it is necessary to brake the wind turbine when the wind speed is too high so that the speed of the wind turbine is within the rated speed.

[0003] In the related technology, the brake components are mainly controlled to contact and generate friction through mechanical brakes, hydraulic brakes and electromagnetic brakes, so as to achieve the purpose of braking. However, since the wind speed changes from zero to exceeding the rated wind speed, the wind turbine is in a rotating working state. When the brake components are suddenly started for emergency braking, the wind turbine will vibrate, which will affect the operation of the wind turbine. At the same time, since the wind turbine is in a high-speed rotating state, when the brake components generate excessive friction, the brake pads will be more worn, which will cause the brake components to be frequently replaced and maintained, increasing the maintenance cost. There is room for improvement. Summary of the invention

[0004] In order to reduce the wear rate of brake components, the present application provides a wind turbine braking method and system.

[0005] In a first aspect, the present application provides a wind turbine braking method, which adopts the following technical solution:

[0006] A wind turbine generator braking method, comprising:

[0007] Continuously collect wind speed data of the wind farm, speed data of the wind turbine, wind vector and angle data between wind rotors to obtain wind speed data set, speed data set and angle data set;

[0008] The wind speed data set, the rotation speed data set and the angle data set are jointly analyzed to determine the relationship between the wind speed, the rotation speed and the angle, and obtain the interaction relationship;

[0009] Obtaining current wind speed data of the current wind farm, and comparing the current wind speed data with a built-in wind speed grade table to determine the current wind speed grade; the built-in wind speed grade table includes a first grade, a second grade, and a third grade;

[0010] If the current wind speed level is the first level, the adjustment amount of the brake system is judged based on the current wind speed data and the interaction relationship to obtain first adjustment amount data, and the brake system is adjusted based on the first adjustment amount data;

[0011] If the current wind speed level is the second level, the current angle data is obtained, and the adjustment amount of the brake system is judged based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship to obtain the second adjustment amount data, and the brake system is adjusted based on the second adjustment amount data;

[0012] If the current wind speed level is the third level, the direction of the wind turbine rotor is adjusted based on the yaw system so that the speed data of the wind turbine is 0, and the brake system of the wind turbine with a speed of 0 is started.

[0013] Preferably, based on the time data of data collection, the wind speed data, rotation speed data and angle data at the same collection time point are matched with each other to obtain a time data group;

[0014] Based on the time sequence, the rotation speed data under the same wind speed data and the same angle data in the time data group are divided to obtain the first rotation speed change data;

[0015] Based on the time interval of the first speed change data, determine the kinetic energy data at the beginning and the kinetic energy data at the end of the time interval, and mark them as the initial kinetic energy data and the end kinetic energy data respectively;

[0016] The kinetic energy difference is calculated based on the initial kinetic energy data and the final kinetic energy data;

[0017] Based on the time interval and the kinetic energy difference, determine the kinetic energy force of the corresponding wind speed on the wind turbine at the angle;

[0018] The kinetic energy force of the wind turbine is judged by different wind speed data under the same angle data, and the relationship between the wind speed data and the kinetic energy force is determined when the angle data remains unchanged;

[0019] The kinetic energy force of the wind turbine is judged by the same wind speed data under different angle data, and the influence relationship of the angle data on the kinetic energy force is determined when the wind speed data remains unchanged;

[0020] Based on the relationship between wind speed data and kinetic energy force when the angle data remains unchanged and the influence of angle data on kinetic energy force when the wind speed data remains unchanged, the data change relationship between wind speed, angle and kinetic energy force is determined and recorded as an interaction relationship.

[0021] Preferably, the current speed data of the wind turbine at the current time point is obtained, and the current speed data is compared with the built-in rated speed;

[0022] If the current speed data is less than the built-in rated speed, the difference between the rated speed and the current speed data is calculated according to the rated speed to obtain the speed difference data;

[0023] Determine the kinetic energy difference based on the speed difference data to obtain an estimated kinetic energy difference;

[0024] Obtain current wind speed data and current angle data of the current wind farm, and determine the kinetic energy force of the current wind speed on the wind turbine according to the current wind speed data, the current angle data and the interaction relationship, and obtain the current kinetic energy force;

[0025] Determine an estimated processing time based on the estimated kinetic energy difference and the current kinetic energy force;

[0026] Controlling the friction force of the brake system based on the estimated processing time and the current kinetic energy force, and determining that the friction force of the brake system increases to the current kinetic energy force within the estimated processing time;

[0027] If the current speed data is equal to the built-in rated speed, the brake system is adjusted according to the friction data.

[0028] Preferably, current speed data of the current wind turbine is obtained, and the current speed data is compared with a built-in rated speed;

[0029] If the current speed data is less than the built-in rated speed, the current angle data is obtained, and based on the angle data, the angle data to be adjusted when the angle between the wind vector and the wind wheel is 0 is determined;

[0030] Obtaining the yaw adjustment rate, and determining the time data to be adjusted according to the yaw adjustment rate and the angle data to be adjusted;

[0031] Based on the angle data to be adjusted, the angle variation range is determined, and the interaction relationship is calculated by definite integral according to the angle variation range and the current wind speed data to obtain the force variation relationship;

[0032] Based on the time data to be adjusted, the definite integral calculation of the force change relationship is performed to obtain the kinetic energy increment;

[0033] Determining a first kinetic energy difference based on the rated speed and the current speed;

[0034] The kinetic energy increment is compared with the first kinetic energy difference. If the kinetic energy increment is less than or equal to the first kinetic energy difference, the yaw system is adjusted based on the angle data to be adjusted, and the speed growth rate of the adjusted wind turbine is judged to obtain the speed growth rate;

[0035] Based on the interaction relationship and the speed growth rate, the force of the adjusted wind speed on the wind turbine is determined to obtain the adjustment force;

[0036] Acquire the speed data of the adjusted wind turbine, compare the speed data of the adjusted wind turbine with the current speed data to obtain a speed difference, and determine the second kinetic energy difference based on the speed difference;

[0037] determining an adjustment time based on the second kinetic energy difference and the adjustment force, and adjusting the brake system based on the adjustment time and the adjustment force;

[0038] If the kinetic energy increment is greater than the first kinetic energy difference, a third kinetic energy difference is determined according to the kinetic energy increment and the first kinetic energy difference, and the brake system is adjusted according to the third kinetic energy difference and the time data to be adjusted.

[0039] Preferably, the angle to be adjusted and the time to be adjusted are determined based on the current angle data;

[0040] Determine the kinetic energy increment based on the time data to be adjusted, the angle data to be adjusted, the current wind speed data and the interaction relationship;

[0041] The kinetic energy increment is compared with the first kinetic energy difference. If the kinetic energy increment is less than or equal to the first kinetic energy difference, the yaw system is reversely adjusted and the speed of the wind turbine is collected during the adjustment process to obtain collected data.

[0042] The collected data is judged, and when the collected data is 0, a brake start signal is output to start the brake system;

[0043] If the kinetic energy increment is greater than the first kinetic energy difference, the brake system is adjusted according to the third kinetic energy difference and the time data to be adjusted until the angle between the wind vector and the wind rotor is 0, and the speed of the wind generator is collected during the adjustment process after the angle between the wind vector and the wind rotor is 0. The collected data is judged, and when the collected data is 0, a brake start signal is output to start the brake system.

[0044] Preferably, the maximum friction force of the brake system is obtained, and the maximum friction force is time-integrated to obtain the kinetic energy consumption rate;

[0045] Based on the special nodes in the angle data, the interaction relationship is divided to obtain a special relationship formula; the special nodes in the angle data include the angle between the wind vector and the wind rotor is 90 degrees, and the angle between the wind vector and the wind rotor is 0 degrees;

[0046] Based on the maximum friction force and the special relationship, the corresponding wind speed data at the special node is determined, and the wind speed data when the angle between the wind vector and the wind rotor is 90 degrees is marked as the first wind speed extreme value, and the wind speed data when the angle between the wind vector and the wind rotor is 0 degrees is marked as the second wind speed extreme value;

[0047] The wind speed less than the first wind speed extreme value is marked as the first level;

[0048] The wind speed greater than the first wind speed extreme value and less than the second wind speed extreme value is marked as the second level;

[0049] The wind speed greater than the second wind speed extreme value is marked as the third level.

[0050] In a second aspect, the present application provides a wind turbine brake system, which adopts the following technical solution:

[0051] A wind turbine brake system, comprising: a data analysis module, a state judgment module and a brake processing module;

[0052] The data analysis module continuously collects the wind speed data of the wind farm, the rotation speed data of the wind turbine, the wind vector and the angle data between the wind rotors to obtain the wind speed data set, the rotation speed data set and the angle data set; jointly analyzes the wind speed data set, the rotation speed data set and the angle data set to determine the relationship between the wind speed, the rotation speed and the angle, and obtain the interaction relationship;

[0053] A state judgment module obtains current wind speed data of the current wind farm and compares the current wind speed data with a built-in wind speed grade table to determine the current wind speed grade; the built-in wind speed grade table includes a first grade, a second grade and a third grade;

[0054] The braking processing module, if the current wind speed level is the first level, the adjustment amount of the braking system is judged based on the current wind speed data and the interaction relationship, the first adjustment amount data is obtained, and the braking system is adjusted based on the first adjustment amount data; if the current wind speed level is the second level, the current angle data is obtained, and the adjustment amount of the braking system is judged based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship, the second adjustment amount data is obtained, and the braking system is adjusted based on the second adjustment amount data; if the current wind speed level is the third level, the wind rotor direction of the wind turbine is adjusted based on the yaw system, so that the speed data of the wind turbine is 0, and the braking system of the wind turbine with a speed of 0 is started.

[0055] In summary, the present application includes at least one of the following beneficial technical effects:

[0056] 1. Through long-term collection of wind speed data, rotation speed data and angle data in the wind farm, the increase in rotation speed under different wind speeds and angles can be analyzed. The safety level of the current wind speed data can be judged to determine the impact of the current wind speed data on the wind power station. Then, the braking system of the wind power station can be controlled accordingly according to the impact of the current wind speed data on the wind power station, so that the braking effect of the braking system can be optimized. At the same time, corresponding braking measures can be taken according to different situations, thereby reducing the wear rate of the braking system.

[0057] 2. By integrating multiple data sets using time data, the integrated data are correlated, so that the analysis results of the interaction relationship analysis based on the integrated data are more accurate. By collecting the change trend of the speed data under the same wind speed data and the same angle data, and then using the kinetic energy formula, the increase in the kinetic energy of the wind turbine caused by the wind speed in this state is determined, and then the kinetic energy force of the wind turbine is determined. Similarly, by analyzing the kinetic energy of the wind turbine under different angle data, the kinetic energy force of the wind speed under different angles is determined. By converting the relationship between wind speed, angle and speed into the force relationship of wind speed on the wind turbine under different angles, the influence of different forces on the speed of the wind turbine is determined through the force relationship, thereby improving the accuracy of the judgment of the interaction relationship;

[0058] 3. Comprehensively utilize the influence of wind speed on the speed of wind turbine under different angles, determine the time required for the yaw system to adjust to an angle of 0 through the current angle data, and then perform definite integral calculation on the angle change interval through the interaction relationship, thereby determining the force change relationship on the wind turbine under different angles for the same wind speed, and then calculate the force change relationship through the time data to be adjusted, thereby determining the kinetic energy imparted to the wind turbine by the wind speed within the time range under the force change relationship, and by comparing the kinetic energy increment with the first kinetic energy difference, thereby determining whether the brake system needs to be started when the yaw system performs yaw adjustment, so that the yaw system and the brake system are judged separately, reducing the influence between multiple data, reducing the complexity of the analysis situation, and thereby improving the analysis rate, and at the same time, by using the yaw system to adjust the angle of the wind turbine to share the adjustment pressure of the brake system, thereby reducing the wear rate of the brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a flow chart of the steps of the wind turbine braking method of this embodiment;

[0060] Figure 2 Module block diagram of the wind turbine brake system of this embodiment.

[0061] Figure numerals: 1. Data analysis module; 2. State judgment module; 3. Braking processing module. DETAILED DESCRIPTION

[0062] The following is combined with Figure 1-Figure 2 This application is described in further detail.

[0063] The embodiments of the present application disclose a wind turbine generator braking method and system.

[0064] Example: Figure 1 As shown, the present invention provides a wind turbine braking method, comprising:

[0065] S100, continuously collect wind speed data of the wind farm, speed data of the wind turbine, wind vector and angle data between the wind rotors to obtain wind speed data set, speed data set and angle data set; in the daily production process, by continuously collecting wind speed data of the wind farm, speed data of the wind turbine and angle data, basic data is provided for determining the relationship between wind speed, speed and angle, making the judgment more accurate. Among them, the wind rotor is a plane composed of blades of the wind turbine, and the wind vector is the wind direction.

[0066] S200, jointly analyzing the wind speed data set, the rotational speed data set and the angle data set, determining the relationship among the wind speed, the rotational speed and the angle, and obtaining the interaction relationship; by using the control variable method, judging the influence of different wind speeds on the rotational speed under the same angle data, and judging the influence of different angles on the rotational speed under the same wind speed data, thereby clarifying the influence relationship of different wind speeds on the rotational speed of the wind turbine under different angles.

[0067] S300, obtain the current wind speed data of the current wind farm, and compare the current wind speed data with the built-in wind speed level table to determine the current wind speed level; the built-in wind speed level table includes the first level, the second level and the third level; wherein the first level is controllable by the brake system, the second level is controllable by the brake system and the yaw system, and the third level is uncontrollable. The built-in wind speed level table is used to obtain the maximum friction force of the brake system, and the maximum friction force is time-integrated to obtain the kinetic energy consumption rate; based on the special nodes in the angle data, the interaction relationship is divided to obtain a special relationship; the special nodes in the angle data include the angle between the wind vector and the wind rotor is 90 degrees, and the angle between the wind vector and the wind rotor is 0 degrees. Based on the maximum friction force and the special relationship, the corresponding wind speed data at the special node is determined. The wind speed data when the angle between the wind vector and the wind rotor is 90 degrees is marked as the first wind speed extreme value, and the wind speed data when the angle between the wind vector and the wind rotor is 0 degrees is marked as the second wind speed extreme value; the wind speed less than the first wind speed extreme value is marked as the first level; the wind speed greater than the first wind speed extreme value and less than the second wind speed extreme value is marked as the second level; the wind speed greater than the second wind speed extreme value is marked as the third level. It can also be set independently.

[0068] S400, if the current wind speed level is the first level, judging the adjustment amount of the brake system based on the current wind speed data and the interaction relationship, obtaining first adjustment amount data, and adjusting the brake system based on the first adjustment amount data;

[0069] S500, if the current wind speed level is the second level, obtaining current angle data, and judging the adjustment amount of the brake system based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship, obtaining second adjustment amount data, and adjusting the brake system based on the second adjustment amount data;

[0070] S600: If the current wind speed level is the third level, the direction of the wind turbine rotor is adjusted based on the yaw system so that the speed data of the wind turbine is 0, and the brake system of the wind turbine with a speed of 0 is started.

[0071] In this embodiment, the wind speed data, rotation speed data and angle data in the wind farm are collected for a long time, and then the increase in rotation speed caused by different wind speeds at different angles is analyzed. The safety level of the current wind speed data is judged, and then the influence of the current wind speed data on the wind power station is determined. Then, according to the influence of the current wind speed data on the wind power station, the braking system of the wind power station is controlled accordingly, so that the braking effect of the braking system is optimized. At the same time, corresponding braking measures are taken according to different situations, thereby reducing the wear rate of the braking system.

[0072] In step S200, the wind speed data set, the rotation speed data set and the angle data set are jointly analyzed to determine the relationship between the wind speed, the rotation speed and the angle, and obtain the interaction relationship, including the following steps:

[0073] S210, matching wind speed data, rotation speed data and angle data at the same acquisition time point based on the time data of data acquisition to obtain a time data group;

[0074] S220, dividing the rotation speed data under the same wind speed data and the same angle data in the time data group based on the time sequence to obtain first rotation speed change data;

[0075] S230, based on the time interval of the first speed change data, determining the kinetic energy data at the beginning and the kinetic energy data at the end of the time interval, and marking them as the initial kinetic energy data and the end kinetic energy data respectively;

[0076] S240, calculating a kinetic energy difference based on the initial kinetic energy data and the final kinetic energy data;

[0077] S250, determining the kinetic energy force of the corresponding wind speed on the wind turbine at the angle based on the time interval and the kinetic energy difference;

[0078] S260, judging the kinetic energy force of the wind turbine under different wind speed data under the same angle data, and determining the relationship between the wind speed data and the kinetic energy force when the angle data remains unchanged; for example, when the wind vector is 90 degrees to the wind rotor, the kinetic energy force obtained by the wind speed of 100 is 50N, and the kinetic energy force obtained by the wind speed of 200 is 100N, then the relationship between the wind speed and the kinetic energy force can be determined as Among them, F is the kinetic energy force, and ν′ is the wind speed to which the wind turbine is subjected.

[0079] S270, judge the kinetic energy force of the wind turbine under the same wind speed data with different angle data, and determine the influence of the angle data on the kinetic energy force when the wind speed data remains unchanged; for example, when the wind vector is 30 degrees to the wind rotor, the kinetic energy force obtained by the wind speed of 100 is 25N, and the kinetic energy force obtained by the wind speed of 200 is 50N, then it can be determined that the influence of the angle on the wind speed is ν″=ν·sinθ, wherein ν″ is the wind speed after the influence of the angle, ν is the collected wind speed, and θ is the angle between the wind vector and the wind rotor.

[0080] S280, based on the relationship between the wind speed data and the kinetic energy force when the angle data remains unchanged, and the influence of the angle data on the kinetic energy force when the wind speed data remains unchanged, determine the data change relationship between the wind speed, the angle, and the kinetic energy force, and record it as an interaction relationship. and ν″=ν·sinθ, and we can get

[0081] In this embodiment, when judging the interaction relationship based on the wind speed data set, the rotational speed data set and the angle data set, the multiple data sets are integrated by using time data so that the integrated data are correlated, thereby making the analysis result of the interaction relationship analysis based on the integrated data more accurate. By collecting the change trend of the rotational speed data under the same wind speed data and the same angle data, and then using the kinetic energy formula, the increase in the kinetic energy of the wind motor caused by the wind speed in this state is determined, and then the kinetic energy force of the wind motor is determined. Similarly, by measuring the influence of the same wind speed on the kinetic energy of the wind motor under different angle data, the influence of the wind speed on the kinetic energy force of the wind motor under different angles is determined. By converting the relationship among wind speed, angle and rotational speed into the force relationship of wind speed on the wind motor under different angles, and then determining the influence of different forces on the rotational speed of the wind motor through the force relationship, the accuracy of the judgment of the interaction relationship is improved.

[0082] In step S400, if the current wind speed level is the first level, the adjustment amount of the brake system is judged based on the current wind speed data and the interaction relationship to obtain the first adjustment amount data, and the brake system is adjusted based on the first adjustment amount data, including the following steps:

[0083] S410, obtaining current speed data of the wind turbine at the current time point, and comparing the current speed data with the built-in rated speed;

[0084] S420, if the current speed data is less than the built-in rated speed, the difference between the rated speed and the current speed data is calculated according to the rated speed to obtain speed difference data;

[0085] S430, determining a kinetic energy difference based on the rotation speed difference data to obtain an estimated kinetic energy difference;

[0086] S440, obtaining current wind speed data and current angle data of the current wind farm, and determining the kinetic energy force of the current wind speed on the wind turbine according to the current wind speed data, the current angle data and the interaction relationship, to obtain the current kinetic energy force;

[0087] S450, determining an estimated processing time based on the estimated kinetic energy difference and the current kinetic energy force;

[0088] S460, controlling the friction force of the brake system based on the estimated processing time and the current kinetic energy force, and determining that the friction force of the brake system increases to the current kinetic energy force within the estimated processing time;

[0089] S470: If the current speed data is equal to the built-in rated speed, the brake system is adjusted according to the friction force data.

[0090] In this embodiment, when it is determined that the wind speed level of the current wind speed is the first level, it means that the wind speed of this level can make the speed of the wind turbine within the rated speed range by adjusting the friction of the brake system. By making a basic judgment on the speed data of the wind turbine to be adjusted, it is determined whether the current wind turbine has reached the rated speed, so that corresponding measures can be taken according to the operating status of the wind turbine. When it is determined that the current speed of the wind turbine has not reached the rated speed, the kinetic energy requirement when the current speed reaches the rated speed and the kinetic energy force of the wind turbine caused by the current wind speed data are determined, and then the time for the brake system to respond is determined, thereby ensuring that the influence of the brake system on the speed of the wind turbine is gradually increasing, reducing the influence of the brake system on the wind turbine, ensuring the stability of the wind turbine operation, and gradually increasing the friction of the brake system, thereby reducing the degree of wear of the brake components in the brake system during braking, thereby increasing the service life of the wind turbine and reducing maintenance costs.

[0091] In step S500, if the current wind speed level is the second level, the current angle data is obtained, and the adjustment amount of the brake system is judged based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship to obtain the second adjustment amount data, and the brake system is adjusted based on the second adjustment amount data, including the following steps:

[0092] S510, obtaining current speed data of the current wind turbine, and comparing the current speed data with the built-in rated speed;

[0093] S520, if the current rotation speed data is less than the built-in rated rotation speed, obtain the current angle data, and determine the angle data to be adjusted when the angle between the wind vector and the wind wheel is 0 based on the angle data;

[0094] S530, obtaining a yaw adjustment rate, and determining time data to be adjusted according to the yaw adjustment rate and the angle data to be adjusted;

[0095] S540, determining an angle variation interval based on the angle data to be adjusted, and performing definite integral calculation on the interaction relationship according to the angle variation interval and the current wind speed data to obtain a force variation relationship;

[0096] S550, performing definite integral calculation on the force change relationship based on the time data to be adjusted to obtain a kinetic energy increment;

[0097] S560, determining a first kinetic energy difference based on the rated speed and the current speed;

[0098] S570, comparing the kinetic energy increment with the first kinetic energy difference, if the kinetic energy increment is less than or equal to the first kinetic energy difference, adjusting the yaw system based on the angle data to be adjusted, and determining the speed growth rate of the adjusted wind turbine to obtain the speed growth rate;

[0099] S580, determining the force of the adjusted wind speed on the wind turbine based on the interaction relationship and the speed growth rate, and obtaining the adjusted force;

[0100] S590, acquiring the speed data of the adjusted wind turbine, comparing the speed data of the adjusted wind turbine with the current speed data to obtain a speed difference, and determining a second kinetic energy difference based on the speed difference;

[0101] S5100, determining an adjustment time based on the second kinetic energy difference and the adjustment force, and adjusting the brake system based on the adjustment time and the adjustment force;

[0102] S5110: If the kinetic energy increment is greater than the first kinetic energy difference, a third kinetic energy difference is determined according to the kinetic energy increment and the first kinetic energy difference, and the brake system is adjusted according to the third kinetic energy difference and the time data to be adjusted. The third kinetic energy difference is used to calculate the kinetic energy data that the brake system needs to consume during the time to be adjusted.

[0103] In this embodiment, when the wind speed level is the second level, it indicates that the rated speed requirement can no longer be met by relying solely on the brake system to control the speed of the wind turbine. Therefore, by utilizing the different forces acting on the wind turbine under different angles under the same wind speed, the yaw system is used to distribute the forces acting on the wind turbine, thereby reducing the braking pressure of the brake system, reducing the degree of damage to the brake system, and ensuring the safety of the brake system.

[0104] The time required for the yaw system to adjust to an angle of 0 is determined through the current angle data, and then the definite integral of the interaction relationship is calculated for the angle variation range to determine the force variation relationship on the wind turbine at different angles for the same wind speed. The force variation relationship is calculated through the time data to be adjusted to determine the kinetic energy imparted to the wind turbine by the wind speed within the time range under the force variation relationship. The kinetic energy increment is compared with the first kinetic energy difference to determine whether the brake system needs to be started when the yaw system is adjusting the yaw. This allows the yaw system and the brake system to be judged separately, reducing the influence of multiple data, reducing the complexity of the analysis, and thereby improving the analysis rate. At the same time, the yaw system is used to adjust the angle of the wind turbine to share the adjustment pressure of the brake system, thereby reducing the wear rate of the brake system.

[0105] In step S600, if the current wind speed level is the third level, the direction of the wind turbine rotor is adjusted based on the yaw system so that the speed data of the wind turbine is 0, and the brake system of the wind turbine with a speed of 0 is started, including the following steps:

[0106] S610, determining the angle to be adjusted and the time to be adjusted based on the current angle data;

[0107] S620, determining a kinetic energy increment based on the to-be-adjusted time data, the to-be-adjusted angle data, the current wind speed data, and the interaction relationship;

[0108] S630, comparing the kinetic energy increment with the first kinetic energy difference, if the kinetic energy increment is less than or equal to the first kinetic energy difference, reversely adjusting the yaw system and collecting the rotation speed of the wind turbine during the adjustment process to obtain collected data;

[0109] S640, judging the collected data, and when the collected data is 0, outputting a brake start signal to start the brake system;

[0110] S650, if the kinetic energy increment is greater than the first kinetic energy difference, the brake system is adjusted according to the third kinetic energy difference and the time data to be adjusted until the angle between the wind vector and the wind rotor is 0, and the speed of the wind turbine is collected during the adjustment process after the angle between the wind vector and the wind rotor is 0, and the collected data is judged, and when the collected data is 0, a brake start signal is output to start the brake system. The wind vector is used as a baseline, the wind rotor of the wind turbine is used as a reference line, the angle formed when the wind vector and the wind rotor are opposite to each other is recorded as a positive angle, and the angle formed when the wind vector and the wind rotor are in the same direction is recorded as a negative angle.

[0111] In this embodiment, when the wind speed level is the third level, it indicates that the wind turbine generator can no longer adjust the brake system and the yaw system so that the speed caused by the influence of the wind speed on the wind turbine is within the rated speed, so shutdown or idling processing is required.

[0112] When the angle between the wind vector and the wind rotor is 90 degrees, the wind force received by the wind turbine is the largest; when the angle between the wind vector and the wind rotor is 0 degrees, the wind force received by the wind turbine is the smallest; when the angle between the wind vector and the wind rotor is a negative angle, the wind turbine is subjected to reverse wind force, so that the force of the wind speed on the wind turbine is a reverse force, thereby reducing the speed of the wind turbine. Therefore, the speed is judged during the adjustment process of the wind turbine from an angle of 90 degrees to 0 degrees, so as to determine whether the speed of the wind turbine is lower than the rated speed during the adjustment process, and then determine whether it is necessary to start the brake system to assist the yaw system in yaw adjustment, so that the adjustment process is safe. At the same time, when the yaw system is adjusted to make the angle a negative angle, the collected data of the speed is judged, and then the brake system is used to perform static braking when the collected data is 0, thereby reducing the impact of high kinetic energy on the brake system and reducing the wear rate of the brake components.

[0113] Based on the description of the above wind turbine brake method embodiment, the present invention also discloses a wind turbine brake system:

[0114] like Figure 2 As shown, a wind turbine braking system, by applying the above-mentioned wind turbine braking method, comprises: a data analysis module 1, a state judgment module 2 and a braking processing module 3;

[0115] Data analysis module 1 continuously collects wind speed data of the wind farm, speed data of the wind turbine, wind vector and angle data between the wind rotors to obtain wind speed data set, speed data set and angle data set; jointly analyzes the wind speed data set, speed data set and angle data set to determine the relationship between wind speed, speed and angle, and obtain the interaction relationship;

[0116] State judgment module 2, obtains the current wind speed data of the current wind farm, and compares the current wind speed data with the built-in wind speed level table to determine the current wind speed level; the built-in wind speed level table includes the first level, the second level and the third level;

[0117] Braking processing module 3, if the current wind speed level is the first level, the adjustment amount of the braking system is judged based on the current wind speed data and the interaction relationship, the first adjustment amount data is obtained, and the braking system is adjusted based on the first adjustment amount data; if the current wind speed level is the second level, the current angle data is obtained, and the adjustment amount of the braking system is judged based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship, the second adjustment amount data is obtained, and the braking system is adjusted based on the second adjustment amount data; if the current wind speed level is the third level, the wind rotor direction of the wind turbine is adjusted based on the yaw system, so that the speed data of the wind turbine is 0, and the braking system of the wind turbine with a speed of 0 is started.

[0118] Compared with the existing wind turbine braking method and system, the present invention reduces the wear rate of the braking components.

[0119] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wind turbine braking method, characterized in that: include: Continuously collect wind speed data of the wind farm, speed data of the wind turbine, wind vector and angle data between wind rotors to obtain wind speed data set, speed data set and angle data set; The wind speed data set, the rotation speed data set and the angle data set are jointly analyzed to determine the relationship between the wind speed, the rotation speed and the angle, and obtain the interaction relationship; Obtaining current wind speed data of the current wind farm, and comparing the current wind speed data with a built-in wind speed grade table to determine the current wind speed grade; the built-in wind speed grade table includes a first grade, a second grade, and a third grade; If the current wind speed level is the first level, the adjustment amount of the brake system is judged based on the current wind speed data and the interaction relationship to obtain first adjustment amount data, and the brake system is adjusted based on the first adjustment amount data; If the current wind speed level is the second level, the current angle data is obtained, and the adjustment amount of the brake system is judged based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship to obtain the second adjustment amount data, and the brake system is adjusted based on the second adjustment amount data; If the current wind speed level is the third level, the direction of the wind turbine rotor is adjusted based on the yaw system so that the speed data of the wind turbine is 0, and the brake system of the wind turbine with a speed of 0 is started.

2. A wind turbine generator braking method according to claim 1, characterized in that: The wind speed data set, the rotation speed data set and the angle data set are jointly analyzed to determine the relationship between the wind speed, the rotation speed and the angle, and obtain the interaction relationship, which is specifically: Based on the time data of data collection, the wind speed data, rotation speed data and angle data at the same collection time point are matched with each other to obtain a time data group; Based on the time sequence, the rotation speed data under the same wind speed data and the same angle data in the time data group are divided to obtain the first rotation speed change data; Based on the time interval of the first speed change data, determine the kinetic energy data at the beginning and the kinetic energy data at the end of the time interval, and mark them as the initial kinetic energy data and the end kinetic energy data respectively; The kinetic energy difference is calculated based on the initial kinetic energy data and the final kinetic energy data; Based on the time interval and the kinetic energy difference, determine the kinetic energy force of the corresponding wind speed on the wind turbine at the angle; The kinetic energy force of the wind turbine is judged by different wind speed data under the same angle data, and the relationship between the wind speed data and the kinetic energy force is determined when the angle data remains unchanged; The kinetic energy force of the wind turbine is judged by the same wind speed data under different angle data, and the influence relationship of the angle data on the kinetic energy force is determined when the wind speed data remains unchanged; Based on the relationship between wind speed data and kinetic energy force when the angle data remains unchanged and the influence of angle data on kinetic energy force when the wind speed data remains unchanged, the data change relationship between wind speed, angle and kinetic energy force is determined and recorded as an interaction relationship.

3. A wind turbine generator braking method according to claim 2, characterized in that: If the current wind speed level is the first level, the adjustment amount of the brake system is judged based on the current wind speed data and the interaction relationship to obtain the first adjustment amount data, and the brake system is adjusted based on the first adjustment amount data, specifically: Obtain the current speed data of the wind turbine at the current time point, and compare the current speed data with the built-in rated speed; If the current speed data is less than the built-in rated speed, the difference between the rated speed and the current speed data is calculated according to the rated speed to obtain the speed difference data; Determine the kinetic energy difference based on the speed difference data to obtain an estimated kinetic energy difference; Obtain current wind speed data and current angle data of the current wind farm, and determine the kinetic energy force of the current wind speed on the wind turbine according to the current wind speed data, the current angle data and the interaction relationship, and obtain the current kinetic energy force; Determine an estimated processing time based on the estimated kinetic energy difference and the current kinetic energy force; Controlling the friction force of the brake system based on the estimated processing time and the current kinetic energy force, and determining that the friction force of the brake system increases to the current kinetic energy force within the estimated processing time; If the current speed data is equal to the built-in rated speed, the brake system is adjusted according to the friction data.

4. A wind turbine generator braking method according to claim 3, characterized in that: If the current wind speed level is the second level, the current angle data is obtained, and the adjustment amount of the brake system is judged based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship to obtain the second adjustment amount data, and the brake system is adjusted based on the second adjustment amount data, specifically: Obtain the current speed data of the current wind turbine and compare the current speed data with the built-in rated speed; If the current speed data is less than the built-in rated speed, the current angle data is obtained, and based on the angle data, the angle data to be adjusted when the angle between the wind vector and the wind wheel is 0 is determined; Obtaining the yaw adjustment rate, and determining the time data to be adjusted according to the yaw adjustment rate and the angle data to be adjusted; Based on the angle data to be adjusted, the angle variation range is determined, and the interaction relationship is calculated by definite integral according to the angle variation range and the current wind speed data to obtain the force variation relationship; Based on the time data to be adjusted, the definite integral calculation of the force change relationship is performed to obtain the kinetic energy increment; Determining a first kinetic energy difference based on the rated speed and the current speed; The kinetic energy increment is compared with the first kinetic energy difference. If the kinetic energy increment is less than or equal to the first kinetic energy difference, the yaw system is adjusted based on the angle data to be adjusted, and the speed growth rate of the adjusted wind turbine is judged to obtain the speed growth rate; Based on the interaction relationship and the speed growth rate, the force of the adjusted wind speed on the wind turbine is determined to obtain the adjustment force; Acquire the speed data of the adjusted wind turbine, compare the speed data of the adjusted wind turbine with the current speed data to obtain a speed difference, and determine the second kinetic energy difference based on the speed difference; determining an adjustment time based on the second kinetic energy difference and the adjustment force, and adjusting the brake system based on the adjustment time and the adjustment force; If the kinetic energy increment is greater than the first kinetic energy difference, a third kinetic energy difference is determined according to the kinetic energy increment and the first kinetic energy difference, and the brake system is adjusted according to the third kinetic energy difference and the time data to be adjusted.

5. A wind turbine generator braking method according to claim 4, characterized in that: If the current wind speed level is the third level, the direction of the wind turbine rotor is adjusted based on the yaw system so that the speed data of the wind turbine is 0, and the brake system of the wind turbine with a speed of 0 is started, specifically: Determine the angle to be adjusted and the time to be adjusted based on the current angle data; Determine the kinetic energy increment based on the time data to be adjusted, the angle data to be adjusted, the current wind speed data and the interaction relationship; The kinetic energy increment is compared with the first kinetic energy difference. If the kinetic energy increment is less than or equal to the first kinetic energy difference, the yaw system is reversely adjusted and the speed of the wind turbine is collected during the adjustment process to obtain collected data. The collected data is judged, and when the collected data is 0, a brake start signal is output to start the brake system; If the kinetic energy increment is greater than the first kinetic energy difference, the brake system is adjusted according to the third kinetic energy difference and the time data to be adjusted until the angle between the wind vector and the wind rotor is 0, and the speed of the wind generator is collected during the adjustment process after the angle between the wind vector and the wind rotor is 0. The collected data is judged, and when the collected data is 0, a brake start signal is output to start the brake system.

6. A wind turbine generator braking method according to claim 5, characterized in that: The built-in wind speed level table is specifically: Obtain the maximum friction force of the brake system, integrate the maximum friction force over time, and obtain the kinetic energy consumption rate; Based on the special nodes in the angle data, the interaction relationship is divided to obtain a special relationship formula; the special nodes in the angle data include the angle between the wind vector and the wind rotor is 90 degrees, and the angle between the wind vector and the wind rotor is 0 degrees; Based on the maximum friction force and the special relationship, the corresponding wind speed data at the special node is determined, and the wind speed data when the angle between the wind vector and the wind rotor is 90 degrees is marked as the first wind speed extreme value, and the wind speed data when the angle between the wind vector and the wind rotor is 0 degrees is marked as the second wind speed extreme value; The wind speed less than the first wind speed extreme value is marked as the first level; The wind speed greater than the first wind speed extreme value and less than the second wind speed extreme value is marked as the second level; The wind speed greater than the second wind speed extreme value is marked as the third level.

7. A wind turbine brake system, characterized in that: The system is used to implement a wind turbine braking method as described in any one of claims 1 to 6: comprising: a data analysis module, a state judgment module and a braking processing module; The data analysis module continuously collects the wind speed data of the wind farm, the rotation speed data of the wind turbine, the wind vector and the angle data between the wind rotors to obtain the wind speed data set, the rotation speed data set and the angle data set; jointly analyzes the wind speed data set, the rotation speed data set and the angle data set to determine the relationship between the wind speed, the rotation speed and the angle, and obtain the interaction relationship; A state judgment module obtains current wind speed data of the current wind farm and compares the current wind speed data with a built-in wind speed grade table to determine the current wind speed grade; the built-in wind speed grade table includes a first grade, a second grade and a third grade; The braking processing module, if the current wind speed level is the first level, the adjustment amount of the braking system is judged based on the current wind speed data and the interaction relationship, the first adjustment amount data is obtained, and the braking system is adjusted based on the first adjustment amount data; if the current wind speed level is the second level, the current angle data is obtained, and the adjustment amount of the braking system is judged based on the current angle data, the current wind speed data, the yaw adjustment rate and the interaction relationship, the second adjustment amount data is obtained, and the braking system is adjusted based on the second adjustment amount data; if the current wind speed level is the third level, the wind rotor direction of the wind turbine is adjusted based on the yaw system, so that the speed data of the wind turbine is 0, and the braking system of the wind turbine with a speed of 0 is started.

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