阅读说明：本技术 一种改进的减缓风力发电机组液压站卡塞的控制方法 (Improved control method for slowing down blockage of hydraulic station of wind generating set ) 是由 邵勤丰 王明军 张云辉 孟新光 黄晓军 曹碧生 刘显波 王秉旭 项勤建 蒋驰雷 于 2020-11-30 设计创作，主要内容包括：本发明涉及风力发电技术,尤其涉及一种改进的减缓风力发电机组液压站卡塞的控制方法,其特征在于：步骤1：液压站压力低于减缓卡塞功能启动值,并且压力上升速度小于设定值,判断液压环路内有异物卡塞,进入减缓卡塞模式；步骤2：减缓卡塞模式控制液压电磁阀以一定频率,连续多次快速开闭,产生脉冲液压压力冲刷液压环路中的卡塞物；步骤3：若压力恢复正常或压力恢复速度大于设定值,说明冲刷卡塞物有效,退出减缓卡塞模式,恢复正常运行模式；步骤4：如液压站压力持续低于停机保护值且超过设定时间,停止快速多次开闭液压电磁阀,退出减缓卡塞模式进入故障停机模式,风力发电机组停机,检修液压站,减少机组停机,提高机组利用率,减少发电损失。(The invention relates to a wind power generation technology, in particular to an improved control method for slowing down blockage of a hydraulic station of a wind generating set, which is characterized by comprising the following steps: step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered; step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop; and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned; and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed rapidly and repeatedly, the blockage slowing mode is exited, the fault shutdown mode is entered, the wind generating set is shut down, the hydraulic station is overhauled, the shutdown of the set is reduced, the utilization rate of the set is improved, and the power generation loss is reduced.)

1. An improved control method for slowing down blockage of a hydraulic station of a wind generating set is characterized by comprising the following working steps:

step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered;

step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop;

and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned;

and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed for many times, and the hydraulic electromagnetic valve exits from the blockage relieving mode and enters the fault shutdown mode. And (5) stopping the wind generating set and overhauling the hydraulic station.

2. The improved control method for slowing down the blockage of the hydraulic station of the wind generating set according to claim 1, is characterized in that: the step 1 further comprises: the starting value of the function of slowing the blockage of the foreign matter blockage in the hydraulic loop and the set value of the pressure rising speed are determined according to the power of the respective hydraulic system and the hydraulic pump.

3. The improved control method for slowing down the blockage of the hydraulic station of the wind generating set according to claim 1, is characterized in that: the step 2 further comprises: the opening and closing frequency of the hydraulic electromagnetic valve is set only according to the characteristics of a hydraulic system, and the common problems of overheating, short service life and the like of the motor do not need to be considered. The hydraulic electromagnetic valve is quickly opened and closed to generate pulse hydraulic pressure to flush the jammed object, so that the jammed object is flushed away, and the effect of slowing down the jamming of the hydraulic station is achieved.

4. The improved control method for slowing down the blockage of the hydraulic station of the wind generating set according to claim 1, is characterized in that: and 3, in the steps 3 and 4, when the system exits from the normal operation recovery mode, or the blockage of the hydraulic station cannot be relieved, and the system enters a fault shutdown.

5. The improved control method for slowing down the blockage of the hydraulic station of the wind generating set according to claim 1, is characterized in that: the detailed steps of the step 1 are as follows: and the pressure of the hydraulic station is lower than the starting value of the jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than the set value by 10 Pa/S, and the control S201 of the jam-slowing hydraulic station is carried out.

6. The improved control method for slowing down the blockage of the hydraulic station of the wind generating set according to claim 1, is characterized in that: the detailed steps of the step 2 are as follows: the controller starts and stops the hydraulic electromagnetic valve S202 at the start-stop frequency of 2.5Hz and the start-stop duty ratio of 2: 1.

7. The improved control method for slowing down the blockage of the hydraulic station of the wind generating set according to claim 1, is characterized in that: the detailed steps of the step 3 are as follows: and if the pressure of the hydraulic station is greater than or equal to 140 Pa or the hydraulic recovery speed is greater than or equal to a set value of 10 Pa/S, quitting the hydraulic station jam slowing control and entering a normal control mode S203.

8. The improved control method for slowing down the blockage of the hydraulic station of the wind generating set according to claim 1, is characterized in that: the detailed steps of the step 4 are as follows: and (3) when the pressure of the hydraulic station is lower than the shutdown set value by 80 Pa, the hydraulic recovery speed is lower than the set value by 10 Pa/S, the duration is longer than 10 seconds, the hydraulic station jam slowing control mode is exited, and the fault shutdown mode is entered S204.

Technical Field

The invention relates to a wind power generation technology, in particular to a method for reducing the halt of a unit, improving the utilization rate of the unit and reducing the power generation loss by slowing down the jam control method of a hydraulic station in the power generation of a wind power generator set.

Background

With the higher installed capacity of wind power in the original proportion of the power grid, continuous optimization design needs to be carried out on a control strategy according to the characteristics of equipment, the utilization rate of a unit is improved, unnecessary fault downtime of the unit is reduced, and the generated energy is increased.

Conventional control strategy for hydraulic station control: and when the pressure is lower than the oil pump starting value of the hydraulic station, starting the oil pump, and when the pressure is higher than the oil pump stopping value, stopping the oil pump. If the hydraulic station is jammed, the pressure is continuously low and is lower than a stop value, the oil pump is stopped, and the pressurizing is stopped to prevent the oil pump from being damaged.

The conventional hydraulic station control strategy is long in operation time of the hydraulic station, a unit which is not well filtered easily breaks down due to insufficient hydraulic pressure, a large amount of generated energy is lost, and unnecessary loss of manpower and material resources is caused by frequent need of sending people to carry out field maintenance and treatment, and cleaning or replacing parts with plugs.

The ZL 201510758559-a control method for slowing down the hydraulic station jam of the wind generating set provides a control method for slowing down the hydraulic station jam, which can effectively flush the jam of a hydraulic loop, but because the hydraulic pump is adopted to generate pulse hydraulic pressure to flush, a problem is caused, the hydraulic pump generates heat and fatigue, so that the working frequency cannot be too high, the working time cannot be too long continuously, and the service life of the hydraulic pump is reduced after the function is started. The starting current of the motor is much larger than the rated current, and the frequent starting and stopping increases larger electric energy loss; frequent starting and stopping of the motor also brings harmonic damage to a power grid, aggravates insulation aging of power equipment, causes overheating of a cable/transformer, damages a reactive compensation device and other electronic equipment, and causes extra energy loss. Another problem is that in order to minimize the use of the hydraulic pump, the blower with the jam needs to be manually identified, and the function of slowing down the jam needs to be started, which requires additional manpower.

Disclosure of Invention

The embodiment of the invention provides an improved control method for slowing down the jamming of a hydraulic station, aiming at the existing problems, through an improved control strategy for slowing down the jamming of the hydraulic station, the jamming control mode is fully automatically started or quitted without manual intervention, pulse hydraulic pressure with higher frequency and longer duration is generated, the probability of flushing hydraulic pressure loop jamming is increased, manpower and material resources are saved, the electric energy loss is hardly increased, harmonic waves harmful to a power grid are not increased, the service life of a hydraulic pump is not reduced, the fault shutdown of a wind generating set is reduced, the utilization rate of wind generating set equipment is improved, and the power generation loss of a wind farm is reduced.

An improved control method for slowing down blockage of a hydraulic station of a wind generating set is characterized by comprising the following working steps:

step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered;

step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop;

and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned;

and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed for many times, and the hydraulic electromagnetic valve exits from the blockage relieving mode and enters the fault shutdown mode. And (5) stopping the wind generating set and overhauling the hydraulic station.

The step 1 further comprises: the starting value of the function of slowing the blockage of the foreign matter blockage in the hydraulic loop and the set value of the pressure rising speed are determined according to the power of the respective hydraulic system and the hydraulic pump.

The step 2 further comprises: the opening and closing frequency of the hydraulic electromagnetic valve is set only according to the characteristics of a hydraulic system, and the common problems of overheating, short service life and the like of the motor do not need to be considered. The hydraulic electromagnetic valve is quickly opened and closed to generate pulse hydraulic pressure to flush the jammed object, so that the jammed object is flushed away, and the effect of slowing down the jamming of the hydraulic station is achieved.

And 3, when the system exits from the recovery normal operation mode or cannot slow down the blockage of the hydraulic station, the system enters fault shutdown.

The detailed steps of the step 1 are as follows: and the pressure of the hydraulic station is lower than the starting value of the jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than the set value by 10 Pa/S, and the control S201 of the jam-slowing hydraulic station is carried out.

The detailed steps of the step 2 are as follows: the controller starts and stops the hydraulic electromagnetic valve S202 at the start-stop frequency of 2.5Hz and the start-stop duty ratio of 2: 1.

The detailed steps of the step 3 are as follows: and if the pressure of the hydraulic station is greater than or equal to 140 Pa or the hydraulic recovery speed is greater than or equal to a set value of 10 Pa/S, quitting the hydraulic station jam slowing control and entering a normal control mode S203.

The detailed steps of the step 4 are as follows: and (3) when the pressure of the hydraulic station is lower than the shutdown set value by 80 Pa, the hydraulic recovery speed is lower than the set value by 10 Pa/S, the duration is longer than 10 seconds, the hydraulic station jam slowing control mode is exited, and the fault shutdown mode is entered S204.

The invention has the beneficial effects that:

1. the invention adopts the improved hydraulic station jam slowing control strategy, does not need manual intervention to start, fully automatically starts or quits the jam slowing control mode, generates pulse hydraulic pressure with higher frequency and longer duration,

2. the invention increases the probability of scouring hydraulic pressure loop blocking objects, saves manpower and material resources, does not reduce the service life of a hydraulic pump, reduces the fault shutdown of a wind generating set, improves the utilization rate of wind generating set equipment and reduces the power generation loss of a wind field.

Drawings

FIG. 1 is a flow chart of the operation of the present invention;

the specific implementation mode is as follows:

example 1:

all of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

As shown in fig. 1, the control method of the present invention includes:

step 1: the pressure of the hydraulic station is lower than a starting value of a jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than a set value by 10 Pa/S, and the hydraulic station enters a jam-slowing control S201;

step 2: the controller starts and stops the hydraulic electromagnetic valve S202 at the start-stop frequency of 2.5Hz and the start-stop duty ratio of 2: 1;

and step 3: when the pressure of the hydraulic station is more than or equal to 140 Pa or the hydraulic recovery speed is more than or equal to a set value of 10 Pa/S, quitting the hydraulic station jam slowing control and entering a normal control mode S203;

and 4, step 4: and (3) when the pressure of the hydraulic station is lower than the shutdown set value by 80 Pa, the hydraulic recovery speed is lower than the set value by 10 Pa/S, the duration is longer than 10 seconds, the hydraulic station jam slowing control mode is exited, and the fault shutdown mode is entered S204.

The improved hydraulic station jam mitigation control method of the present invention is shown in fig. 1, wherein key parameters need to be set and optimized according to the equipment characteristics of the unit.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.

Example 2

An improved control method for slowing down blockage of a hydraulic station of a wind generating set is characterized by comprising the following working steps:

step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered;

step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop;

and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned;

and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed for many times, and the hydraulic electromagnetic valve exits from the blockage relieving mode and enters the fault shutdown mode. And (5) stopping the wind generating set and overhauling the hydraulic station.

The step 1 further comprises: the starting value of the function of slowing the blockage of the foreign matter blockage in the hydraulic loop and the set value of the pressure rising speed are determined according to the power of the respective hydraulic system and the hydraulic pump.

The step 2 further comprises: the opening and closing frequency of the hydraulic electromagnetic valve is set only according to the characteristics of a hydraulic system, and the common problems of overheating, short service life and the like of the motor do not need to be considered. The hydraulic electromagnetic valve is quickly opened and closed to generate pulse hydraulic pressure to flush the jammed object, so that the jammed object is flushed away, and the effect of slowing down the jamming of the hydraulic station is achieved.

And 3, when the system exits from the recovery normal operation mode or cannot slow down the blockage of the hydraulic station, the system enters fault shutdown.

The detailed steps of the step 1 are as follows: and the pressure of the hydraulic station is lower than the starting value of the jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than the set value by 10 Pa/S, and the control S201 of the jam-slowing hydraulic station is carried out.

The detailed steps of the step 3 are as follows: and if the pressure of the hydraulic station is greater than or equal to 140 Pa or the hydraulic recovery speed is greater than or equal to a set value of 10 Pa/S, quitting the hydraulic station jam slowing control and entering a normal control mode S203.

The detailed steps of the step 4 are as follows: and (3) when the pressure of the hydraulic station is lower than the shutdown set value by 80 Pa, the hydraulic recovery speed is lower than the set value by 10 Pa/S, the duration is longer than 10 seconds, the hydraulic station jam slowing control mode is exited, and the fault shutdown mode is entered S204.

Example 3

An improved control method for slowing down blockage of a hydraulic station of a wind generating set is characterized by comprising the following working steps:

step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered;

step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop;

and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned;

and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed for many times, and the hydraulic electromagnetic valve exits from the blockage relieving mode and enters the fault shutdown mode. And (5) stopping the wind generating set and overhauling the hydraulic station.

The step 1 further comprises: the starting value of the function of slowing the blockage of the foreign matter blockage in the hydraulic loop and the set value of the pressure rising speed are determined according to the power of the respective hydraulic system and the hydraulic pump.

The step 2 further comprises: the opening and closing frequency of the hydraulic electromagnetic valve is set only according to the characteristics of a hydraulic system, and the common problems of overheating, short service life and the like of the motor do not need to be considered. The hydraulic electromagnetic valve is quickly opened and closed to generate pulse hydraulic pressure to flush the jammed object, so that the jammed object is flushed away, and the effect of slowing down the jamming of the hydraulic station is achieved.

And 3, when the system exits from the recovery normal operation mode or cannot slow down the blockage of the hydraulic station, the system enters fault shutdown.

The detailed steps of the step 1 are as follows: and the pressure of the hydraulic station is lower than the starting value of the jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than the set value by 10 Pa/S, and the control S201 of the jam-slowing hydraulic station is carried out.

The detailed steps of the step 3 are as follows: and if the pressure of the hydraulic station is greater than or equal to 140 Pa or the hydraulic recovery speed is greater than or equal to a set value of 10 Pa/S, quitting the hydraulic station jam slowing control and entering a normal control mode S203.

The detailed steps of the step 4 are as follows: and (3) when the pressure of the hydraulic station is lower than the shutdown set value by 80 Pa, the hydraulic recovery speed is lower than the set value by 10 Pa/S, the duration is longer than 10 seconds, the hydraulic station jam slowing control mode is exited, and the fault shutdown mode is entered S204.

Example 4

An improved control method for slowing down blockage of a hydraulic station of a wind generating set is characterized by comprising the following working steps:

step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered;

step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop;

and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned;

and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed for many times, and the hydraulic electromagnetic valve exits from the blockage relieving mode and enters the fault shutdown mode. And (5) stopping the wind generating set and overhauling the hydraulic station.

The step 1 further comprises: the starting value of the function of slowing the blockage of the foreign matter blockage in the hydraulic loop and the set value of the pressure rising speed are determined according to the power of the respective hydraulic system and the hydraulic pump.

The step 2 further comprises: the opening and closing frequency of the hydraulic electromagnetic valve is set only according to the characteristics of a hydraulic system, and the common problems of overheating, short service life and the like of the motor do not need to be considered. The hydraulic electromagnetic valve is quickly opened and closed to generate pulse hydraulic pressure to flush the jammed object, so that the jammed object is flushed away, and the effect of slowing down the jamming of the hydraulic station is achieved.

And 3, when the system exits from the recovery normal operation mode or cannot slow down the blockage of the hydraulic station, the system enters fault shutdown.

The detailed steps of the step 1 are as follows: and the pressure of the hydraulic station is lower than the starting value of the jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than the set value by 10 Pa/S, and the control S201 of the jam-slowing hydraulic station is carried out.

The detailed steps of the step 2 are as follows: the controller starts and stops the hydraulic electromagnetic valve S202 at the start-stop frequency of 2.5Hz and the start-stop duty ratio of 2: 1.

The detailed steps of the step 4 are as follows: and (3) when the pressure of the hydraulic station is lower than the shutdown set value by 80 Pa, the hydraulic recovery speed is lower than the set value by 10 Pa/S, the duration is longer than 10 seconds, the hydraulic station jam slowing control mode is exited, and the fault shutdown mode is entered S204.

Example 5

An improved control method for slowing down blockage of a hydraulic station of a wind generating set is characterized by comprising the following working steps:

step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered;

step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop;

and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned;

and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed for many times, and the hydraulic electromagnetic valve exits from the blockage relieving mode and enters the fault shutdown mode. And (5) stopping the wind generating set and overhauling the hydraulic station.

The step 1 further comprises: the starting value of the function of slowing the blockage of the foreign matter blockage in the hydraulic loop and the set value of the pressure rising speed are determined according to the power of the respective hydraulic system and the hydraulic pump.

The step 2 further comprises: the opening and closing frequency of the hydraulic electromagnetic valve is set only according to the characteristics of a hydraulic system, and the common problems of overheating, short service life and the like of the motor do not need to be considered. The hydraulic electromagnetic valve is quickly opened and closed to generate pulse hydraulic pressure to flush the jammed object, so that the jammed object is flushed away, and the effect of slowing down the jamming of the hydraulic station is achieved.

And 3, when the system exits from the recovery normal operation mode or cannot slow down the blockage of the hydraulic station, the system enters fault shutdown.

The detailed steps of the step 1 are as follows: and the pressure of the hydraulic station is lower than the starting value of the jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than the set value by 10 Pa/S, and the control S201 of the jam-slowing hydraulic station is carried out.

The detailed steps of the step 2 are as follows: the controller starts and stops the hydraulic electromagnetic valve S202 at the start-stop frequency of 2.5Hz and the start-stop duty ratio of 2: 1.

The detailed steps of the step 3 are as follows: and if the pressure of the hydraulic station is greater than or equal to 140 Pa or the hydraulic recovery speed is greater than or equal to a set value of 10 Pa/S, quitting the hydraulic station jam slowing control and entering a normal control mode S203.

Example 6

An improved control method for slowing down blockage of a hydraulic station of a wind generating set is characterized by comprising the following working steps:

step 1: the pressure of the hydraulic station is lower than a function starting value of the blockage reducing, the pressure rising speed is lower than a set value, whether foreign matter is blocked in a hydraulic loop is judged, and a blockage reducing mode is entered;

step 2: the hydraulic electromagnetic valve is controlled to be opened and closed continuously and rapidly for multiple times at a certain frequency in a blockage relieving mode, and pulse hydraulic pressure is generated to wash blockage objects in a hydraulic loop;

and step 3: if the pressure returns to normal or the pressure recovery speed is greater than a set value, the situation that the object is effectively flushed is indicated, the jam slowing mode is exited, and the normal operation mode is returned;

and 4, step 4: if the pressure of the hydraulic station is continuously lower than the shutdown protection value and exceeds the set time, the hydraulic electromagnetic valve is stopped to be opened and closed for many times, and the hydraulic electromagnetic valve exits from the blockage relieving mode and enters the fault shutdown mode. And (5) stopping the wind generating set and overhauling the hydraulic station.

The step 1 further comprises: the starting value of the function of slowing the blockage of the foreign matter blockage in the hydraulic loop and the set value of the pressure rising speed are determined according to the power of the respective hydraulic system and the hydraulic pump.

The step 2 further comprises: the opening and closing frequency of the hydraulic electromagnetic valve is set only according to the characteristics of a hydraulic system, and the common problems of overheating, short service life and the like of the motor do not need to be considered. The hydraulic electromagnetic valve is quickly opened and closed to generate pulse hydraulic pressure to flush the jammed object, so that the jammed object is flushed away, and the effect of slowing down the jamming of the hydraulic station is achieved.

And 3, when the system exits from the recovery normal operation mode or cannot slow down the blockage of the hydraulic station, the system enters fault shutdown.

The detailed steps of the step 1 are as follows: and the pressure of the hydraulic station is lower than the starting value of the jam-slowing function by 120 Pa, and the hydraulic recovery speed is lower than the set value by 10 Pa/S, and the control S201 of the jam-slowing hydraulic station is carried out.

The detailed steps of the step 2 are as follows: the controller starts and stops the hydraulic electromagnetic valve S202 at the start-stop frequency of 2.5Hz and the start-stop duty ratio of 2: 1.

The detailed steps of the step 3 are as follows: and if the pressure of the hydraulic station is greater than or equal to 140 Pa or the hydraulic recovery speed is greater than or equal to a set value of 10 Pa/S, quitting the hydraulic station jam slowing control and entering a normal control mode S203.

The detailed steps of the step 4 are as follows: and (3) when the pressure of the hydraulic station is lower than the shutdown set value by 80 Pa, the hydraulic recovery speed is lower than the set value by 10 Pa/S, the duration is longer than 10 seconds, the hydraulic station jam slowing control mode is exited, and the fault shutdown mode is entered S204.