1. A wind turbine generator load-friendly propeller clamping and stopping method is characterized by comprising the following steps:

the pitch control system monitors the fault of the pitch control system in real time, and if the pitch control fault occurs, the pitch control system judges whether the fault type is a single-blade clamping fault;

if the variable pitch system judges that the single-blade clamping type fault does not exist, the safety chain of the three blades is disconnected, and the three blades execute emergency feathering;

if the pitch control system judges that the single-blade clamping type fault occurs, the safety chain of the fault surface blade is disconnected by switching the circuit through the change-over switch, and the fault surface blade automatically and emergently feathers; the safety chain of the blade without the fault surface is kept not to be broken;

the variable pitch system sends a fault identifier to the master control system, and the master control system judges whether the fault is a real single-blade clamping fault or not according to the fault identifier;

if the master control system judges that the single blade clamping fails, disconnecting the safety chain of the blade without the failure surface, and executing emergency feathering on the blade without the failure surface;

and if the master control system judges that the actual single-blade clamping has a fault, shielding an emergency feathering hardware switch of the pitch control system, and executing shutdown by the non-fault-surface blade according to a closed-loop controlled shutdown mode given by the master control system.

2. The wind turbine generator load-friendly blade clamping shutdown method according to claim 1, characterized in that when the pitch system judges that the single-blade clamping fault does not occur, the pitch system controls the blades on the fault plane to break the safety chain; meanwhile, the variable pitch system uploads the fault condition to the main control system, the main control system issues an emergency feathering instruction, and the safety chain is disconnected for the blades on the non-fault surface.

3. The wind turbine load-friendly pitch shutdown method according to claim 1, wherein the given closed-loop controlled shutdown mode comprises:

the variable pitch system monitors the rotating speed of the wind wheel, and if the rotating speed of the wind wheel exceeds the safe rotating speed, the blade without the fault surface executes emergency feathering.

4. The wind turbine load-friendly pitch shutdown method according to claim 1, wherein the given closed-loop controlled shutdown mode comprises:

and in the process of stopping the machine, timing from the fault moment, and if the feathering is not carried out to the safety angle after the preset time, executing emergency stop without the fault surface.

5. The wind turbine generator load-friendly propeller clamping and stopping method according to claim 4, wherein the preset time is 100-120 seconds, and the safety angle is greater than 60 degrees.

6. A wind turbine load-friendly propeller clamping stop system, which is characterized in that propeller clamping stop can be executed by using the wind turbine load-friendly propeller clamping stop method of any one of claims 1 to 5, and comprises the following steps: and the change-over switch is arranged in the main control system and is used for switching connection of an emergency feathering software switch of the main control system, an emergency feathering hardware switch of the variable pitch system and a safety chain of the blade.

7. The wind turbine generator load-friendly paddle clamping shutdown system as recited in claim 6, wherein the change-over switch is a single-pole double-throw switch, a moving end of the single-pole double-throw switch is connected with a safety chain of a blade, and a first stationary end of the single-pole double-throw switch is connected with an emergency feathering software switch of the master control system to form a line 1; the second stationary end is connected with an emergency feathering hardware switch of the pitch system to form a line 2.

8. The wind turbine generator load-friendly blade clamping shutdown system according to claim 7, wherein when a non-single-blade clamping type fault occurs, the change-over switch is switched to line 2; when a single-blade clamping paddle type fault occurs, the change-over switch is switched to a line 1.

Background

At present, the new type development of the whole machine manufacturer of the wind generating set in China basically carries out load design according to IEC standard, and the power generation superposition faults of the wind generating set are one important working condition in the design working condition of the whole machine according to the IEC standard requirement. However, when the wind generating set is in a generating process, a condition that a single blade of the wind generating set is clamped at a certain angle and cannot rotate occurs, namely, when a single blade clamping failure occurs, the extreme load of the waving direction at the hub position is easy to occur in the stopping process according to the existing stopping mode of breaking a pitch-variable safety chain and emergently feathering the wind generating set. The existing shutdown method for the single-blade clamping paddle in the failure is as follows:

as shown in fig. 1, the pitch control system monitors the operation condition of the system in real time, and if a single-blade pitch clamping fault occurs, the pitch control system shields the instruction of the master control system to perform automatic emergency feathering. With reference to the hardware structure shown in fig. 2, assuming that the blade No. 1 is in a blade-locking fault, the safety chain P1 corresponding to the blade No. 1 is immediately disconnected for emergency feathering, but in an actual situation, the blade No. 1 is locked and cannot be feathered. Because the hardware switch of the variable-pitch EFC (variable-pitch emergency feathering) and the safety chains P1, P2 and P3 of the three blades are in an interlocking relationship, the safety chains P2 and P3 can be simultaneously disconnected, the No. 2 blade and the No. 3 blade cannot receive variable-pitch EFC hardware switch signals (usually 24V voltage signals), and the No. 2 blade and the No. 3 blade can perform emergency feathering according to the emergency stop speed preset in the variable-pitch system. Because the whole action has almost no time delay, the three blades can basically act simultaneously and are in emergency feathering. The shutdown method is easy to cause the flapping direction limit load at the center of the hub in the emergency feathering process.

According to above-mentioned prior art's scheme, when the single blade card oar trouble appears in the control shutdown process, the limit load that appears wheel hub department and wave the direction easily, this will carry higher load requirement to the load design, and higher load requirement can become the bottleneck that some key part designs of wind generating set fall the cost, wave the direction at wheel hub department and appear limit load simultaneously, also can influence wind generating set's safe operation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a wind turbine generator load-friendly blade clamping shutdown method and system, and aims to solve the technical problem that the waving direction limit load at a hub is easy to occur in the shutdown control process under the working condition of single-blade clamping according to the prior art.

The technical scheme adopted by the invention is as follows, and in a first aspect, the invention provides a wind turbine generator load-friendly type clamping paddle stopping method which comprises the following steps:

the pitch control system monitors the fault of the pitch control system in real time, and if the pitch control fault occurs, the pitch control system judges whether the fault type is a single-blade clamping fault;

if the variable pitch system judges that the single-blade clamping type fault does not exist, the safety chain of the three blades is disconnected, and the three blades execute emergency feathering;

if the pitch control system judges that the single-blade clamping type fault occurs, the safety chain of the fault surface blade is disconnected by switching the circuit through the change-over switch, and the fault surface blade automatically and emergently feathers; the safety chain of the blade without the fault surface is kept not to be broken;

the variable pitch system sends a fault identifier to the master control system, and the master control system judges whether the fault is a real single-blade clamping fault or not according to the fault identifier;

if the master control system judges that the single blade clamping fails, disconnecting the safety chain of the blade without the failure surface, and executing emergency feathering on the blade without the failure surface;

and if the master control system judges that the actual single-blade clamping has a fault, shielding an emergency feathering hardware switch of the pitch control system, and executing shutdown by the non-fault-surface blade according to a closed-loop controlled shutdown mode given by the master control system.

Further, when the variable pitch system judges that the single-blade clamping faults do not exist, the variable pitch system controls the blades on the fault surface to break the safety chain; meanwhile, the variable pitch system uploads the fault condition to the main control system, the main control system issues an emergency feathering instruction, and the safety chain is disconnected for the blades on the non-fault surface.

Further, a given closed-loop controlled shutdown mode includes:

the variable pitch system monitors the rotating speed of the wind wheel, and if the rotating speed of the wind wheel exceeds the safe rotating speed, the blade without the fault surface executes emergency feathering.

Further, a given closed-loop controlled shutdown mode includes:

and in the process of stopping the machine, timing from the fault moment, and if the feathering is not carried out to the safety angle after the preset time, executing emergency stop without the fault surface.

Furthermore, the preset time is 100-120 seconds, and the safety angle is larger than 60 degrees.

In a second aspect, a wind turbine load-friendly propeller clamping shutdown system is provided, which can execute propeller clamping shutdown by using the wind turbine load-friendly propeller clamping shutdown method provided in the first aspect, and includes: and the change-over switch is arranged in the main control system and is used for switching connection of an emergency feathering software switch of the main control system, an emergency feathering hardware switch of the variable pitch system and a safety chain of the blade.

Further, the change-over switch is a single-pole double-throw switch, the moving end of the single-pole double-throw switch is connected with the safety chain of the blade, and the first fixed end of the single-pole double-throw switch is connected with an emergency feathering software switch of the master control system to form a circuit 1; the second stationary end is connected with an emergency feathering hardware switch of the pitch system to form a line 2.

Further, when a non-single-blade clamping paddle fault occurs, the change-over switch is switched to the line 2; when a single-blade clamping paddle type fault occurs, the change-over switch is switched to a line 1.

According to the technical scheme, the beneficial technical effects of the invention are as follows:

1. the shutdown mode that in the prior art, after a single-blade propeller clamping fault occurs, a safety chain is immediately broken and the propeller is changed into the self emergency feathering can be broken through, and the load reduction control requirement of the shutdown process under the propeller clamping working condition can be met.

2. Closed-loop controlled feathering of a fault-free surface of a variable pitch system is realized, and the limit load of the hub waving direction in the working condition shutdown process of the propeller clamping is effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a flow chart of a shutdown method in the case of a single blade chucking failure in the prior art according to the background of the present invention;

FIG. 2 is a diagram of a main hardware configuration of a shutdown operation in the case of a single-blade paddle failure in the background art of the present invention;

FIG. 3 is a flow chart of a friendly paddle clamping shutdown method in an embodiment of the invention;

FIG. 4 is a diagram of a part of the main hardware structure used in the friendly paddle card shutdown system in the embodiment of the present invention;

FIG. 5 is a comparison graph of the pitch angle timing of the prior art and the embodiment of the present invention;

FIG. 6 is a graph comparing the effect of loading during shutdown for both the prior art and the embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

Examples

The embodiment provides a wind turbine generator load-friendly paddle clamping shutdown method, as shown in fig. 3: the method comprises the following steps:

and S1, monitoring the fault of the variable pitch system in real time, and if the variable pitch fault occurs, judging whether the fault type is the single-blade clamping fault by the variable pitch system.

In a specific implementation mode, the pitch system judges whether the fault is a single-blade clamping fault or not according to a preset pitch fault type through a pitch central controller.

S2, if the variable pitch system judges that the single-blade clamping type fault does not exist, the safety chain of the three blades is disconnected, and the three blades execute emergency feathering

And when the variable pitch central controller judges that the fault type is not the single-blade clamping type fault, the variable pitch system controls the blades of the fault surface to break the safety chain and execute emergency feathering. Meanwhile, the variable pitch system uploads the fault condition to the main control system, the main control system issues an emergency feathering instruction, the safety chain of the blade on the non-fault surface is also disconnected, and the emergency feathering is immediately executed.

S3, if the pitch control system judges that the single-blade clamping type fault exists, switching a circuit through a change-over switch, disconnecting a safety chain of the fault surface blade, and executing self emergency feathering of the fault surface blade; the safety chain of the non-faulty face blade is kept unbroken.

In a specific embodiment, as shown in fig. 4, a switch is added to the hardware structure of the main control system. The change-over switch is a single-pole double-throw switch, the moving end of the single-pole double-throw switch is connected with the safety chain of the blade, and the first fixed end of the single-pole double-throw switch is connected with the emergency feathering software switch of the master control system to form a circuit 1; the second stationary end is connected with an emergency feathering hardware switch of the pitch system to form a line 2. When a non-single-blade clamping paddle fault occurs, the change-over switch is switched to a line 2; when single-blade clamping faults occur, the change-over switch is switched to the circuit 1, and the function of the emergency feathering hardware switch of the pitch control system is shielded from the hardware structure, so that the blades without the fault can receive the instruction of the master control system, the safety chain is not disconnected, and closed-loop controlled shutdown is performed.

In the step, the fault surface self-emergency feathering is executed through a pitch control system.

S4, the variable pitch system sends a fault identifier to the master control system, and the master control system judges whether the fault is a real single-blade clamping fault or not according to the fault identifier

And S3, disconnecting the safety chain of the fault plane, executing self emergency feathering of the fault plane, simultaneously sending a fault identifier to the main control system by the pitch control system, and judging whether the fault is a real single-blade propeller clamping fault or not by the main control system according to the fault identifier and a preset fault judgment program. In the current practical situation, the single-blade clamping paddle fault false alarm caused by the reason that the proximity switch is triggered by mistake and the like can occur, and the fault false alarm situation can be eliminated in the step, so that a proper shutdown mode can be selected next conveniently.

S5, if the master control system judges that the single blade clamping failure is not true, the safety chain of the blade without the failure surface is disconnected, and the blade without the failure surface executes emergency feathering

In a specific implementation mode, if the master control system judges that the single-blade propeller clamping fails, the master control system issues a variable-pitch shutdown angle according to an emergency shutdown mode, a safety chain of a blade without a fault plane is disconnected, and the blade without the fault plane executes emergency feathering.

And S6, if the master control system judges that the actual single-blade clamping has a fault, shielding an emergency feathering hardware switch of the pitch control system, and executing shutdown by the non-fault surface blade according to a closed-loop controlled shutdown mode given by the master control system.

And if the master control system judges that the actual single-blade clamping has a fault, shielding an emergency feathering hardware switch of the pitch control system, connecting a safety chain of the non-fault surface blade with an emergency feathering software switch of the master control system, and executing shutdown by the non-fault surface blade according to a closed-loop controlled shutdown mode given by the master control system.

Meanwhile, in the closed-loop controlled shutdown process of the non-fault surface blade, in order to ensure the safety of the wind generating set in the shutdown process, the safety monitoring work of two aspects of the variable pitch system is newly added. Firstly, a variable pitch system monitors the rotating speed of a wind wheel, and if the rotating speed of the wind wheel exceeds a safe rotating speed, emergency feathering is executed on a blade without a fault surface; secondly, in the process of stopping the machine, if the preset time T1 is counted from the fault time and the feathering is not reached to the safety angle Pangle1, the emergency stop is executed without a fault surface. In a specific embodiment, the preset time T1 is preferably 100-120 seconds, and the safety angle Pangle1 is preferably greater than 60 degrees.

By adopting the technical scheme of the embodiment, the shutdown mode that in the prior art, after a single-blade propeller clamping fault occurs, a safety chain is immediately broken and the propeller self is in emergency feathering can be broken through, the load reduction control requirement in the shutdown process under the propeller clamping working condition can be met, the closed-loop controlled feathering of the propeller system without fault plane is realized, and the limit load of the hub waving direction in the propeller clamping working condition shutdown process is effectively reduced. FIG. 5 shows the pitch angle timing before and after the present technique is applied to a certain model under normal turbulent wind conditions with an average wind speed of 10 m/s; the timing of the corresponding hub center flap direction load in fig. 6 is clearly shown in the figure, and the ultimate load of the new system is obviously reduced compared with the load result of the original system.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.