A control method for a wind turbine generator set variable pitch centralized lubrication system

Abstract

The present invention provides a control method for a wind turbine variable pitch centralized lubrication system, comprising the following steps: S1, obtaining the status of the wind turbine; S2, when the start-up conditions are met, obtaining the lubrication pump information; S3, if the actual lubrication stroke c does not reach the number of lubrication strokes C required for the lubrication cycle, the lubrication pump is directly powered on to start lubrication, otherwise the lubrication pump is not started, and the actual lubrication time t is obtained; S4, when the actual lubrication time accumulates to the required lubrication cycle T, the actual lubrication stroke c and the actual lubrication time t are restored to the initial value; S5, if no pulse signal is received within the B time, counting is performed, and a blocking signal alarm is issued after accumulating to a preset value Y. The method meets the centralized lubrication needs of wind turbines, reasonably greases the variable pitch bearings, solves the problems of inaccurate grease injection, grease rejection, grease overflow, blocking warning / fault, insufficient lubricating oil warning / fault, etc., and reduces the unit operation loss and later maintenance pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a control method for a variable pitch centralized lubrication system of a wind power generator set. Background Art

[0002] At present, the centralized lubrication system of the variable pitch bearing of the wind turbine generator set generally adopts an automatic control system, that is, the lubrication is controlled by the control circuit in the lubrication pump body. This lubrication method only needs the unit to provide power, which is relatively simple to implement. However, this lubrication method cannot lubricate according to the operating status of the unit, that is, the lubrication system is separated from the operating status of the unit, resulting in a difference between the actual amount of grease injection and the amount required by the bearing, causing problems such as grease rejection or insufficient lubrication, which brings inconvenience to later maintenance. At the same time, there are also problems such as grease concentration in certain local positions of the bearing, and blockage warnings after air mixing. Summary of the invention

[0003] In view of this, the problem to be solved by the present invention is to provide a control method for a wind turbine variable pitch centralized lubrication system. The method meets the centralized lubrication needs of the wind turbine, reasonably greases the variable pitch bearings, solves problems such as inaccurate grease injection, grease rejection, grease overflow, blockage warning / fault, insufficient lubricating oil warning / fault, etc., and reduces the operating loss of the unit and the pressure of subsequent maintenance.

[0004] The present invention solves the above technical problems through the following technical means: The present invention provides a control method for a wind turbine generator set variable pitch centralized lubrication system, comprising the following steps:

[0005] S1. Obtain the status of the fan and determine whether the lubricating oil pump meets the starting conditions;

[0006] S2. When the start-up conditions are met, obtain the lubrication pump information to determine whether the actual lubrication stroke c of the unit reaches the number of lubrication strokes C required for the lubrication cycle;

[0007] S3. If the actual lubrication stroke c does not reach the number of lubrication strokes C required for the lubrication cycle, the lubrication pump is directly powered on to start lubrication, and at this time, the blade pitch change action and the lubrication pump power-on action are independently executed in parallel. If the actual lubrication stroke c has reached the number of lubrication strokes C required for the lubrication cycle, the lubrication pump is not started, and the actual lubrication time t is obtained. At the same time, the three blades rotate back and forth continuously within c°~d°;

[0008] S4, judging whether the actual lubrication time t reaches the required lubrication cycle T, when the actual lubrication time accumulates to the required lubrication cycle T, the actual lubrication stroke c and the actual lubrication time t are restored and reset to the initial values;

[0009] S5. After the lubrication pump is powered on, if no pulse signal is received within time B, count a is incremented. When count a accumulates to the preset value Y, a blockage signal alarm is issued, and at the same time, count a is cleared;

[0010] S6. After the lubrication pump is powered on, if a pulse signal is received within time B, count a is immediately cleared. It is determined whether the actual time consumption t of this cycle reaches the required lubrication cycle T. If it reaches, return to step S1. If it does not reach and the start condition is met, return to step S1. If it does not reach and the start condition is not met, the lubrication pump stops being powered on and stops the rotational control of the blade by pitch lubrication. The pitch executes the original command, that is, the blade is feathered to 90°.

[0011] Further, the start condition includes that the average wind speed in 3 minutes < v, the average wind speed in 10 seconds < v, the unit meets the small wind shutdown condition, the high-speed shaft speed < W rpm, and the low oil level and blockage alarms of the lubrication pump are not triggered, where v = wind speed.

[0012] Further, when the actual lubrication stroke c < the required lubrication stroke C, the blade pitch movement and the power-on action of the lubrication pump are independent of each other and are executed in parallel.

[0013] Further, the low oil level alarm is that no 24V signal is received for X seconds when the lubrication pump is powered on. When the low oil level alarm and the lubrication blockage alarm are received, a remote reset can be performed once a day respectively.

[0014] Further, when count a > 0, the rotational control of the blade by pitch lubrication is stopped, and the pitch executes the original command, that is, the blade is feathered to 90°. When count a = 0, the three blades rotate back and forth continuously within c° to d°.

[0015] Further, after the lubrication pump is powered on, if a pulse signal is received within time B, timing is restarted after the pulse signal is received.

[0016] It can be seen from the above technical scheme that the beneficial effects of the present invention are as follows: the present invention provides a control method for a wind turbine variable pitch centralized lubrication system, comprising the following steps: S1, obtaining the status of the wind turbine and determining whether the lubricating oil pump meets the starting conditions; S2, when the starting conditions are met, obtaining the lubrication pump information and determining whether the actual lubrication stroke c of the unit reaches the number of lubrication strokes C required for the lubrication cycle; S3, if the actual lubrication stroke c does not reach the number of lubrication strokes C required for the lubrication cycle, the lubrication pump is directly powered on to start lubrication; if the actual lubrication stroke c has reached the number of lubrication strokes C required for the lubrication cycle, the lubrication pump is not started, and the actual lubrication time t is obtained; S4, determining whether the actual lubrication time t reaches the required lubrication cycle T, when the actual lubrication time accumulates to the required lubrication cycle T, the actual lubrication stroke c and the actual lubrication time t are restored to the initial reset value; S5, after the lubrication pump is powered on, if no pulse signal is received within the B time, count a is counted, and when count a accumulates to a preset value Y, a blockage signal alarm is issued, and at the same time count a is cleared; S6, after the lubrication pump is powered on, if a pulse signal is received within time B, count a is cleared immediately, and the process returns to step S1, and at the same time, it is determined whether the actual lubrication time t of this cycle reaches the required lubrication cycle T. If not, the lubrication pump stops being powered on. This method meets the centralized lubrication needs of wind turbines, reasonably greases the variable pitch bearings, solves problems such as inaccurate grease injection, grease rejection, grease overflow, blockage warning / fault, and insufficient lubricating oil warning / fault, and reduces the unit's operating losses and subsequent maintenance pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0018] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0019] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0020] See also Figure 1 As shown, the present invention provides a method for controlling a wind turbine generator set variable pitch centralized lubrication system, comprising the following steps:

[0021] S1. Obtain the status of the fan and determine whether the lubricating oil pump meets the starting conditions; Starting conditions: the average wind speed in 3 minutes < v, and the average wind speed in 10 seconds < v, and the unit meets the small wind shutdown conditions ("triggered by the average wind speed low in 600 seconds" and "triggered by the wind speed outside the starting operation range"), and the high-speed shaft speed < W rpm, and the low oil level and blockage alarms of the lubricating pump are not triggered, v = wind speed.

[0022] S2. When the starting conditions are met, obtain the information of the lubricating pump and determine whether the actual lubrication stroke c of the unit has reached the number of lubrication strokes C required for this lubrication cycle; C = the number of strokes required for each standard cycle; c = the actual number of strokes run in this cycle; the number of lubrication strokes C required is determined by comprehensive calculation based on the annual grease injection volume requirement of the lubrication object and the single grease injection stroke volume of the centralized lubrication system or set according to the design standard.

[0023] S3. If the actual lubrication stroke c has not reached the number of lubrication strokes C required for this lubrication cycle, the lubricating pump is directly powered on to start lubrication. If the actual lubrication stroke c has reached the number of lubrication strokes C required for this lubrication cycle, the lubricating pump does not start, and the actual lubrication time t is obtained; when the actual lubrication stroke c < the required lubrication stroke C, the blade pitch change action and the power-on action of the lubricating pump are independent of each other and are executed in parallel.

[0024] S4. Determine whether the actual lubrication time t has reached the required lubrication cycle T. When the actual lubrication time accumulates to the required lubrication cycle T, the actual lubrication stroke c and the actual lubrication time t are reset to their initial values; T = the time consumed for each standard cycle; t = the actual time consumed in this cycle; the required lubrication cycle T can be set according to the actual operating status of the unit, and the annual grease injection demand of the bearing can be evenly distributed to each lubrication cycle T, realizing uniform distribution of the lubrication amount in the time dimension.

[0025] S5. After the lubrication pump is powered on, if no pulse signal is received within the B time, count a is counted. When count a accumulates to the preset value Y, a blocking signal alarm is issued, and count a is cleared at the same time; B = duration; Count a = counting unit (initial value 0); represents the number of exhaust times, and each exhaust time is B. For example, set count a to 12 and B to 5min, which means that from the time the lubrication pump is powered on, when the grease does not flow due to air mixing, the lubrication pump will exhaust 12 times, each time for 5 minutes. The alarm condition is set to remote reset once to remind the on-site maintenance personnel to go to the unit to check whether there is a problem with the hardware, to avoid frequent remote resets and repeated entry into the exhaust mode, causing the problem of fast grease injection. When count a>0, the variable pitch lubrication stops the rotation control of the blades, and the variable pitch executes the original command, that is, the blades are aligned to 90°; when count a=0, the three blades rotate back and forth within c°~d°. After the lubrication pump is powered on, if a pulse signal is received within the B time, the timing is restarted after the pulse signal is received. After it is judged that the actual time t of this cycle is less than the required lubrication cycle T, the next step is to judge whether the starting conditions are met, rather than directly returning to c<C to complete the grease injection in one go. This is to ensure that the blades are always in a rotating state during the grease injection, so as to achieve uniform distribution of grease in the variable pitch bearing. After it is judged that the actual time t of this cycle is less than the required lubrication cycle T, the purpose of listing the starting conditions separately is that when the starting conditions are not met, the blade control and the lubrication pump power-on control can be separated, which is adapted to the state where the lubrication pump is energized but the blades do not move during exhaust.

[0026] S6. After the lubrication pump is powered on, if a pulse signal is received within time B, count a is immediately reset to zero, and it is determined whether the actual time t of this cycle reaches the required lubrication cycle T. If it reaches, it returns to step S1. If it does not reach and the start condition is met, it returns to step S1. If it does not reach and the start condition is not met, the lubrication pump stops powering on and stops the variable pitch lubrication to control the rotation of the blades. The variable pitch executes the original command, that is, the blades are aligned to 90°. The number of strokes is: 1 pulse counts as 1 stroke, and 1 high-low-high or low-high-low level signal counts as 1 pulse.

[0027] As a further improvement to the above technical solution, the low oil level alarm is when no 24V signal is received for X seconds when the lubrication pump is powered on. When the low oil level alarm and lubrication blockage alarm are received, they can be remotely reset once a day, and X can be 10 to 20.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for controlling a wind turbine generator set pitch-controlled centralized lubrication system, characterized in that: It includes the following steps: S1. Obtain the fan status and determine whether the lubricating oil pump meets the starting conditions. The starting conditions include that the average wind speed in 3 minutes < v, the average wind speed in 10 seconds < v, the unit meets the small wind shutdown condition, the high-speed shaft speed < W rpm, and the low oil level and blockage alarms of the lubricating pump are not triggered, where v = wind speed; S2. After the starting conditions are met, obtain the lubricating pump information and determine whether the actual lubrication stroke c of the unit reaches the number of lubrication strokes C required for this lubrication cycle; S3. If the actual lubrication stroke c does not reach the number of lubrication strokes C required for this lubrication cycle, the lubricating pump is directly powered on for lubrication, and at this time, the blade pitching action and the power-on action of the lubricating pump are independently and parallely executed. If the actual lubrication stroke c has reached the number of lubrication strokes C required for this lubrication cycle, the lubricating pump does not start, and the actual lubrication time t is obtained. At the same time, the three blades continuously rotate back and forth within c° to d°; S4. Determine whether the actual lubrication time t reaches the required lubrication cycle T. When the actual lubrication time accumulates to the required lubrication cycle T, the actual lubrication stroke c and the actual lubrication time t are reset to their initial values; S5. After the lubricating pump is powered on, if no pulse signal is received within B time, count a is incremented. When count a accumulates to the preset value Y, a blockage signal alarm is issued, and at the same time, count a is cleared; S6. After the lubricating pump is powered on, if a pulse signal is received within B time, count a is immediately cleared, and it is determined whether the actual elapsed time t of this cycle reaches the required lubrication cycle T. If it reaches, return to step S1. If it does not reach and the starting conditions are met, return to step S1. If it does not reach and the starting conditions are not met, the lubricating pump stops being powered on and stops the rotational control of the blade pitching for lubrication, and the pitching executes the original command, that is, the blade feathers to 90°; 2. The wind turbine generator set variable pitch centralized lubrication system control method according to claim 1, characterized in that: The low oil level and blockage alarm means that no 24V signal is received for X seconds continuously when the lubricating pump is powered on. When the low oil level and blockage alarm is received, a remote reset is performed once a day respectively; 3. The wind turbine generator set variable pitch centralized lubrication system control method according to claim 1, characterized in that: When count a > 0, stop the rotational control of the blade pitching for lubrication, and the pitching executes the original command, that is, the blade feathers to 90°. When count a = 0, the three blades continuously rotate back and forth within c° to d°; 4. The wind turbine generator set variable pitch centralized lubrication system control method according to claim 1, characterized in that: After the lubricating pump is powered on, if a pulse signal is received within B time, re-time after receiving the pulse signal;

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