阅读说明：本技术 一种风电机组变桨电机制动扭矩在线检测装置及方法 (Wind turbine generator pitch motor braking torque online detection device and method ) 是由 王振威 吕峰 张春勇 张仁河 郭晓宇 郑皓 赵彦鹏 于 2019-11-13 设计创作，主要内容包括：本申请公开了一种风电机组变桨电机制动扭矩在线检测装置及方法,所述装置包括变桨电机、三向加速度传感器和变桨驱动器；变桨电机与变桨驱动器连接；三向加速度传感器集成于变桨驱动器内部,用于向变桨驱动器实时反馈三向加速度信号,变桨驱动器内置变桨系统控制程序。本申请通过三向加速度传感器判断对应叶片所处位置,以统一的速比保证所测试电机具备相同的测试基准和测试精度,通过依次输出正向与反向转矩,进行变桨电机制动扭矩的检验。本申请可实现对变桨电机制动扭矩进行在线检测,尽可能地避免叶片自重等相关因素的干扰,较精确地检验变桨电机制动扭矩是否合格,为变桨电机制动器是否需要更换提出预警,为风电机组整机的安全做出保证。(The application discloses a brake torque on-line detection device and method for a variable-pitch motor of a wind turbine generator, wherein the device comprises a variable-pitch motor, a three-way acceleration sensor and a variable-pitch driver; the variable pitch motor is connected with the variable pitch driver; the three-way acceleration sensor is integrated in the variable pitch driver and used for feeding back a three-way acceleration signal to the variable pitch driver in real time, and a control program of a variable pitch system is arranged in the variable pitch driver. The position of the corresponding blade is judged through the three-way acceleration sensor, the tested motor is guaranteed to have the same test reference and test precision through the unified speed ratio, and the braking torque of the variable pitch motor is tested by sequentially outputting forward and reverse torques. The method and the device can realize online detection of the braking torque of the variable pitch motor, avoid interference of related factors such as dead weight of the blades and the like as far as possible, accurately detect whether the braking torque of the variable pitch motor is qualified or not, provide early warning for whether the brake of the variable pitch motor needs to be replaced or not, and guarantee the safety of the whole wind turbine generator.)

1. The utility model provides a wind turbine generator system becomes oar motor braking moment of torsion on-line measuring device which characterized in that:

the device comprises a variable pitch motor, a three-way acceleration sensor and a variable pitch driver;

the variable pitch motor is connected with a variable pitch driver;

the variable pitch motor comprises a motor body, a motor brake and a rotary transformer, wherein the rotary transformer is used for feeding back the rotating speed of the variable pitch motor and calculating to obtain the angle of the blade;

the three-way acceleration sensor is integrated in the variable pitch driver and used for feeding back acceleration signals in the XYZ three directions to the variable pitch driver in real time;

the variable pitch driver is internally provided with a variable pitch system control program and has a position operation mode and a brake inspection mode;

when a variable pitch motor braking torque test enabling signal sent by the master control of the fan is received, the variable pitch driver is switched to a brake test mode, and a variable pitch motor braking torque test logic is executed; otherwise, the variable pitch driver is in a position operation mode, and the brake torque test logic of the variable pitch motor is not executed;

when the variable pitch driver is in a position operation mode, the variable pitch driver operates according to the gear ratio required by the whole machine; when switching to the brake checking mode, operation is performed in a checking set gear ratio.

2. The wind turbine generator pitch motor braking torque online detection device according to claim 1, characterized in that:

the position operation mode is as follows: the variable pitch system receives a master control instruction of the fan or the working state according to the self fault and the maintenance requirement;

the brake test mode is as follows: only the motor brake checking function is executed, the fan master control angle or speed instruction is not received, and the motor brake is in a closed state in the whole process.

3. An online detection method for braking torque of a pitch motor of a wind turbine generator, based on the online detection device for braking torque of the pitch motor of the wind turbine generator in claim 1 or 2, is characterized in that:

the method comprises the following steps:

step 1: the method comprises the following steps that a fan master control sends a variable pitch motor braking torque detection enabling signal;

step 2: the variable pitch driver receives a variable pitch motor braking torque test enabling signal and initializes a variable pitch braking torque detection result and a variable pitch system alarm state;

and step 3: checking whether the current blade is in a stop position, if so, executing the step 4, otherwise, alarming by a variable pitch system;

and 4, step 4: judging whether the motor brake is in a brake state, if so, executing the step 5, otherwise, alarming by a variable pitch system;

and 5: the variable pitch driver judges the position of the corresponding blade according to the received feedback information of the three-way acceleration sensor; when the position of the blade reaches a set range, the variable pitch driver enters a brake inspection mode, the variable pitch driver is divided into two times, forward and reverse moments are sequentially output, and the brake torque of the variable pitch motor is inspected;

in the whole process of testing the braking torque of the variable pitch motor, if the feedback rotating speed of the motor is greater than the set upper limit of the rotating speed or the angular deviation before and after the motor test is greater than the upper limit of the angular deviation, judging that the braking torque of the variable pitch motor is unqualified, and exiting the brake test mode; otherwise, the braking torque of the variable pitch motor is judged to be qualified, and the design requirement is met.

4. The wind turbine generator pitch motor braking torque online detection method according to claim 3, characterized in that:

and 1, enabling a brake torque test enabling signal of the variable pitch motor to be a Boolean value.

5. The wind turbine generator pitch motor braking torque online detection method according to claim 3, characterized in that:

step 5, the positive torque is in the direction of opening the propeller and is in the direction of 90-0 degrees;

the reverse moment is in the feathering direction and is in the direction from 0 degree to 90 degrees.

6. The wind turbine generator pitch motor braking torque online detection method according to claim 5, characterized in that:

and 5, checking the braking torque of the variable pitch motor, which specifically comprises the following steps:

step a: b, applying a positive torque by the variable pitch driver, judging whether the speed of the corresponding variable pitch motor is smaller than a set upper limit of the rotating speed in the process of applying the positive torque, if so, executing the step b, otherwise, stopping torque output by the variable pitch driver and giving an alarm by a variable pitch system;

step b: judging whether the angle deviation of the corresponding blade before and after the application of the positive torque is smaller than the upper limit of the angle deviation, if so, executing the step c, otherwise, stopping torque output of the variable pitch driver and giving an alarm to a variable pitch system;

step c: b, applying a reverse torque by the variable pitch driver, judging whether the speed of the corresponding variable pitch motor is smaller than a set upper limit of the rotating speed in the process of applying the reverse torque, if so, executing the step d, otherwise, stopping torque output by the variable pitch driver and giving an alarm by a variable pitch system;

step d: and judging whether the angle deviation of the corresponding blade before and after the application of the reverse torque is smaller than the upper limit of the angle deviation, if so, testing is qualified, and a testing qualified signal is fed back to the main control of the fan, otherwise, the variable pitch driver stops torque output and the variable pitch system gives an alarm.

7. The wind turbine generator pitch motor braking torque online detection method according to claim 6, characterized in that:

the test pass signal is a boolean value.

8. The wind turbine generator pitch motor braking torque online detection method according to any one of claims 3-7, characterized in that:

after the variable pitch drive enters the brake inspection mode in the step 5, the detection device does not receive the fan master control angle or speed instruction any more until the test is completed or the fan master control side cancels the variable pitch motor brake torque inspection enabling signal.

Technical Field

The invention belongs to the technical field of wind power, relates to a brake torque detection technology of a variable pitch motor of a wind turbine generator, and particularly relates to an online detection device and method for the brake torque of the variable pitch motor of the wind turbine generator.

Background

The wind power generation technology has made great progress nowadays, and the operability and maintainability of a variable pitch system as an important control and protection device of a wind turbine generator set are gradually valued by people. At present, domestic wind turbines are mainly of 2. XMW-3. XMW models, the rated power of the wind turbine and the length of a blade face continuous lifting, and accordingly the torque load capacity of a variable pitch system is synchronously lifted.

In the shutdown stage of the wind turbine generator, wind power needs to be overcome by means of the braking torque provided by the variable pitch motor, so that the blades of the fan are maintained at a specific angle, and the braking torque of the variable pitch motor is attenuated along with the increase of service time. Whether the braking torque of the variable pitch motor meets the requirement of a real working condition in the whole design life or not can directly influence the safety of the whole wind turbine generator. Therefore, it is very important to detect and confirm whether the braking torque of the variable pitch motor meets the design requirement after the fan is in service.

At present, the braking torque detection of the variable pitch motor mostly uses manual and mechanical detection means, or the detection is only carried out when the motor is subjected to factory test. However, after the actual fan is in service, the variable pitch motor and the hub reducer are assembled into a whole, and the brake torque is very difficult to detect due to the influence of the gravity of the blades and the wind power. Therefore, a device and a method are needed to be designed, so that whether the braking torque of the variable pitch motor meets the design requirement can be periodically detected under the condition that the wind turbine generator is stopped or in a low wind, and the safety of the whole wind turbine generator is ensured.

Disclosure of Invention

In order to overcome the defects in the prior art, the application provides the device and the method for detecting the braking torque of the variable-pitch motor of the wind turbine generator, and the braking torque of the variable-pitch motor of the wind turbine generator in a service stage is detected on line regularly.

In order to achieve the above object, the first invention of the present application adopts the following technical solutions:

a wind turbine generator system variable pitch motor braking torque on-line detection device comprises a variable pitch motor, a three-way acceleration sensor and a variable pitch driver;

the variable pitch motor is connected with a variable pitch driver;

the variable pitch motor comprises a motor body, a motor brake and a rotary transformer, wherein the rotary transformer is used for feeding back the rotating speed of the variable pitch motor and calculating to obtain the angle of the blade;

the three-way acceleration sensor is integrated in the variable pitch driver and used for feeding back acceleration signals in the XYZ three directions to the variable pitch driver in real time;

the variable pitch driver is internally provided with a variable pitch system control program and has a position operation mode and a brake inspection mode;

when a variable pitch motor braking torque test enabling signal sent by the master control of the fan is received, the variable pitch driver is switched to a brake test mode, and a variable pitch motor braking torque test logic is executed; otherwise, the variable pitch driver is in a position operation mode, and the brake torque test logic of the variable pitch motor is not executed;

when the variable pitch driver is in a position operation mode, the variable pitch driver operates according to the gear ratio required by the whole machine; when switching to the brake checking mode, operation is performed in a checking set gear ratio.

The invention further comprises the following preferred embodiments:

preferably, the position operation mode is as follows: the variable pitch system receives a master control instruction of the fan or the working state according to the self fault and the maintenance requirement;

the brake test mode is as follows: only the motor brake checking function is executed, the fan master control angle or speed instruction is not received, and the motor brake is in a closed state in the whole process.

The application also discloses another invention, namely an online detection method for the braking torque of the variable pitch motor of the wind turbine generator, which is based on the online detection device for the braking torque of the variable pitch motor of the wind turbine generator, and the method comprises the following steps:

step 1: the method comprises the following steps that a fan master control sends a variable pitch motor braking torque detection enabling signal;

step 2: the variable pitch driver receives a variable pitch motor braking torque test enabling signal and initializes a variable pitch braking torque detection result and a variable pitch system alarm state;

and step 3: checking whether the current blade is in a stop position, if so, executing the step 4, otherwise, alarming by a variable pitch system;

and 4, step 4: judging whether the motor brake is in a brake state, if so, executing the step 5, otherwise, alarming by a variable pitch system;

and 5: the variable pitch driver judges the position of the corresponding blade according to the received feedback information of the three-way acceleration sensor; when the position of the blade reaches a set range, the variable pitch driver enters a brake inspection mode, the variable pitch driver is divided into two times, forward and reverse moments are sequentially output, and the brake torque of the variable pitch motor is inspected;

in the whole process of testing the braking torque of the variable pitch motor, if the feedback rotating speed of the motor is greater than the set upper limit of the rotating speed or the angular deviation before and after the motor test is greater than the upper limit of the angular deviation, judging that the braking torque of the variable pitch motor is unqualified, and exiting the brake test mode; otherwise, the braking torque of the variable pitch motor is judged to be qualified, and the design requirement is met.

Preferably, the braking torque verification enabling signal of the pitch motor in the step 1 is a boolean value.

Preferably, the positive moment in the step 5 is in the opening direction, and is in the direction of 90-0 degrees;

the reverse moment is in the feathering direction and is in the direction from 0 degree to 90 degrees.

Preferably, the step 5 of checking the braking torque of the pitch motor specifically comprises the following steps:

step a: b, applying a positive torque by the variable pitch driver, judging whether the speed of the corresponding variable pitch motor is smaller than a set upper limit of the rotating speed in the process of applying the positive torque, if so, executing the step b, otherwise, stopping torque output by the variable pitch driver and giving an alarm by a variable pitch system;

step b: judging whether the angle deviation of the corresponding blade before and after the application of the positive torque is smaller than the upper limit of the angle deviation, if so, executing the step c, otherwise, stopping torque output of the variable pitch driver and giving an alarm to a variable pitch system;

step c: b, applying a reverse torque by the variable pitch driver, judging whether the speed of the corresponding variable pitch motor is smaller than a set upper limit of the rotating speed in the process of applying the reverse torque, if so, executing the step d, otherwise, stopping torque output by the variable pitch driver and giving an alarm by a variable pitch system;

step d: and judging whether the angle deviation of the corresponding blade before and after the application of the reverse torque is smaller than the upper limit of the angle deviation, if so, testing is qualified, and a testing qualified signal is fed back to the main control of the fan, otherwise, the variable pitch driver stops torque output and the variable pitch system gives an alarm.

Preferably, the test pass signal is a boolean value.

Preferably, after the pitch control driver enters the brake inspection mode in step 5, the detection device does not receive the fan master control angle or speed instruction any more until the test is completed or the pitch control side of the fan cancels the brake torque inspection enabling signal of the pitch control motor.

The beneficial effect that this application reached:

by the device and the method, the wind turbine generator can periodically perform online detection on the braking torque of the variable pitch motor in the service stage, the interference of related factors such as the dead weight of the blades is avoided as much as possible, whether the braking torque of the variable pitch motor is qualified is accurately detected, early warning is provided for whether the motor brake needs to be replaced, and the safety of the whole wind turbine generator is guaranteed

Drawings

FIG. 1 is a schematic structural diagram of an online detection device for braking torque of a pitch motor of a wind turbine generator set according to the present application;

FIG. 2 is a flow chart of an online detection method for the braking torque of a pitch motor of a wind turbine generator.

Detailed Description

The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.

The device and the method for detecting the braking torque of the variable-pitch motor of the wind turbine generator are mainly applied to the detection of the braking torque of the variable-pitch motor during service, and as shown in figure 1, the device comprises the variable-pitch motor, a three-way acceleration sensor and a variable-pitch driver;

the variable pitch motor comprises a motor body, a motor brake and a rotary transformer, wherein the motor body, the motor brake and the rotary transformer (rotary transformer) are respectively connected with a variable pitch driver through a motor power cable, a motor rotary transformer cable and a motor brake cable, and the rotary transformer is used for feeding back the rotating speed of the variable pitch motor and calculating to obtain the angle of the blade;

the three-way acceleration sensor is integrated in the variable pitch driver and used for feeding back acceleration signals in the XYZ three directions to the variable pitch driver in real time;

the variable pitch driver is internally provided with a variable pitch system control program and has a position operation mode and a brake inspection mode;

when a variable pitch motor braking torque test enabling signal sent by the master control of the fan is received, the variable pitch driver is switched to a brake test mode, and a variable pitch motor braking torque test logic is executed; otherwise, the variable pitch driver is in a position operation mode, and the brake torque test logic of the variable pitch motor is not executed;

when the variable pitch driver is in a position operation mode, the variable pitch driver operates according to the gear ratio required by the whole machine; when the brake test mode is switched, the motor is operated in a test set gear ratio, so that the motor is ensured to have the same test standard and the test precision is improved.