阅读说明：本技术 用于风电机组的变桨系统的超级电容的自检分析方法 (Self-checking analysis method for super capacitor of variable pitch system of wind turbine generator ) 是由 杨德亮 刘昊 高菊辉 于 2019-11-06 设计创作，主要内容包括：本发明公开了用于风电机组的变桨系统的超级电容的自检分析方法,包括：处理单元向风电机组发送超级电容自检指令；风电机组接收指令,进入轴1,轴2和轴3的自检状态；处理单元在自检状态下采集轴1,轴2及轴3的测试数据；处理单元将轴1,轴2及轴3的测试数据分别与正常值比较,若在正常值的允许范围内,则复位安全链,复位故障信息,机组进入待机状态,若超过正常值的允许范围,则认定轴1,轴2或轴3的超级电容故障,需要检查更换轴1,轴2或轴3的超级电容,测试方法安全可靠,能够有效提高变桨超级电容故障诊断的速度和故障诊断的精度,减少超级电容的故障停机时间。(The invention discloses a self-checking analysis method for a super capacitor of a variable pitch system of a wind turbine generator, which comprises the following steps: the processing unit sends a super capacitor self-checking instruction to the wind turbine generator system; the wind turbine generator receives the instruction and enters a self-checking state of the shaft 1, the shaft 2 and the shaft 3; the processing unit collects the test data of the shaft 1, the shaft 2 and the shaft 3 in a self-checking state; the processing unit respectively compares the test data of the shaft 1, the shaft 2 and the shaft 3 with normal values, if the test data are within an allowable range of the normal values, the safety chain is reset, fault information is reset, the unit enters a standby state, if the test data exceed the allowable range of the normal values, the super capacitor fault of the shaft 1, the shaft 2 or the shaft 3 is determined, the super capacitor of the shaft 1, the shaft 2 or the shaft 3 needs to be checked and replaced, the test method is safe and reliable, the speed of fault diagnosis of the variable-pitch super capacitor and the precision of the fault diagnosis can be effectively improved, and the fault downtime of the super capacitor is reduced.)

1. A self-checking analysis method for a super capacitor of a variable pitch system of a wind turbine generator is characterized by comprising the following steps:

step 1, a processing unit sends a super capacitor self-checking instruction to a wind turbine generator system;

step 2: the wind turbine generator receives the super capacitor self-checking instruction, a super capacitor self-checking program is called, and the wind turbine generator enters a super capacitor self-checking mode and enters a shaft 1 self-checking state;

the self-checking state of the shaft 1 specifically includes:

the variable-pitch system automatically drives the shaft 1 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 1 from commercial power to a super capacitor for power supply, and the shaft 1 emergently retracts to the safety position;

the method comprises the steps that a processing unit acquires first information of a shaft 1, wherein the first information comprises capacitance voltage, a variable pitch angle, variable pitch speed, a safety chain and on-off conditions of a charger, and first test data comprising capacitance voltage drop, feathering time and blade position are obtained from the first information;

and step 3: and the processing unit compares the first test data with a normal value, resets the safety chain and the fault information if the first test data of the shaft 1 is within an allowable range of the normal value, and determines that the super capacitor of the shaft 1 is in fault if the first test data of the shaft 1 exceeds the allowable range of the normal value, so that the super capacitor of the shaft 1 needs to be checked and replaced.

2. The self-test analysis method for the supercapacitor of the pitch system of the wind turbine according to claim 1,

when the first test data of the shaft 1 is within the allowable range of the normal value, resetting the safety chain, and after resetting the fault information, entering a self-checking state of the shaft 2;

the self-checking state of the shaft 2 specifically includes:

the variable-pitch system automatically drives the shaft 2 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 2 from mains supply to super capacitor power supply, and the shaft 2 emergently retracts to a safety position;

the processing unit acquires second information of the shaft 2, including capacitance voltage, a variable pitch angle, a variable pitch speed, a safety chain and the on-off condition of the charger, and acquires second test data including capacitance voltage drop, feathering time and blade position from the second information;

and the processing unit compares the second test data with a normal value, resets the safety chain and the fault information if the second test data of the shaft 2 is within an allowable range of the normal value, and determines that the super capacitor of the shaft 2 has a fault if the second test data of the shaft 2 exceeds the allowable range of the normal value, so that the super capacitor of the shaft 2 needs to be checked and replaced.

3. The self-test analysis method for the supercapacitor of the pitch system of the wind turbine according to claim 2,

when the second test data of the shaft 2 is within the allowable range of the normal value, resetting the safety chain, and after resetting the fault information, entering a self-checking state of the shaft 3;

the self-checking state of the shaft 3 specifically includes:

the variable-pitch system automatically drives the shaft 3 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 3 from mains supply to super capacitor power supply, and the shaft 3 emergently retracts to a safety position;

the processing unit acquires third information of the shaft 3, including capacitance voltage, a variable pitch angle, a variable pitch speed, a safety chain and the on-off condition of the charger, and acquires third test data including capacitance voltage drop, feathering time and blade position from the third information;

and the processing unit compares the third test data with a normal value, resets the safety chain and the fault information if the third test data of the shaft 3 is within an allowable range of the normal value, and determines that the super capacitor of the shaft 3 has a fault if the third test data of the shaft 3 exceeds the allowable range of the normal value, and the super capacitor of the shaft 3 needs to be checked and replaced.

4. The self-test analysis method for the supercapacitor of the pitch system of the wind turbine according to claim 3,

further comprising the step 0: and the processing unit remotely sends a self-checking test instruction of the super capacitor to the wind turbine generator set through network communication.

5. The self-checking analysis method for the supercapacitor of the pitch system of the wind turbine generator according to claim 4, wherein after the processing unit sends the self-checking test instruction of the supercapacitor to the wind turbine generator remotely through network communication, the wind turbine generator judges whether the self-checking condition of the supercapacitor is met, and the self-checking instruction of the supercapacitor is executed under the condition that the self-checking condition of the supercapacitor is met.

6. The self-test analysis method for the supercapacitor of the pitch system of the wind turbine according to claim 5,

the condition information that the wind turbine generator meets the self-checking condition of the super capacitor comprises:

the running mode of the fan is in a standby state and in a non-untwisting state;

the fan has no global fault and no safety chain fault;

the 10-minute average wind speed of the fan is less than 5 m/s;

the pitch angles of the variable pitch blades are all in safe positions.

7. The self-inspection analysis method for the supercapacitor of the pitch system of the wind turbine generator set according to claim 3, wherein the first test data, the second test data and the third test data collected by the processing unit are stored for query and archiving.

Technical Field

The invention relates to the field of self-checking of a super capacitor of a wind turbine generator, in particular to a self-checking analysis method of a super capacitor of a variable pitch system of the wind turbine generator.

Background

The backup power supply of the wind turbine generator is the last barrier for ensuring the safe operation of the wind turbine generator, and plays an important role in the safe, stable and efficient operation of the wind turbine generator.

A variable pitch system of the wind turbine generator is powered by a power grid under the condition that the power grid normally supplies power, and when the power grid fails, a backup power supply provides energy to carry out emergency feathering or realize low-voltage ride through.

The backup power source of the variable pitch system of the wind turbine generator mainly comprises a storage battery and a super capacitor, wherein the super capacitor is more and more widely applied to the variable pitch system due to the characteristics of high power density, long service life, wide working temperature, no maintenance and the like.

In the past, the mode of monitoring voltage is mainly adopted on a variable pitch system of a wind turbine generator to feed back the quality of a super capacitor in real time, specifically including the monitoring of the voltage of the capacitor, the voltage of a middle point, the voltage unbalance and the like, but the mode of monitoring the voltage cannot comprehensively reflect the health state of the capacitor, and for better detection of the performance of the super capacitor, the commonly used method at present is a blade loaded discharge test, but has the defects of complex operation, time and labor waste, slow detection speed and low detection efficiency of a detection method, so that the wind turbine generator is high in runaway risk, high in manual operation and maintenance cost, low in unit operation safety, low in power generation efficiency and poor in economic benefit.

Disclosure of Invention

The invention aims to solve the problems and provide a self-checking analysis method for a unit of an intelligent diagnosis variable pitch super capacitor.

The invention realizes the purpose through the following technical scheme:

the self-checking analysis method for the super capacitor of the variable pitch system of the wind turbine generator comprises the following steps:

step 1, a processing unit sends a super capacitor self-checking instruction to a wind turbine generator system;

step 2: the wind turbine generator receives the super capacitor self-checking instruction, a super capacitor self-checking program is called, and the wind turbine generator enters a super capacitor self-checking mode and enters a shaft 1 self-checking state;

the self-checking state of the shaft 1 specifically includes:

the variable-pitch system automatically drives the shaft 1 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 1 from commercial power to a super capacitor for power supply, and the shaft 1 emergently retracts to the safety position;

the method comprises the steps that a processing unit acquires first information of a shaft 1, wherein the first information comprises capacitance voltage, a variable pitch angle, variable pitch speed, a safety chain and on-off conditions of a charger, and first test data comprising capacitance voltage drop, feathering time and blade position are obtained from the first information;

and step 3: and the processing unit compares the first test data with a normal value, resets the safety chain and the fault information if the test result of the shaft 1 is within the allowable range of the normal value, and determines that the super capacitor of the shaft 1 has a fault if the test result of the shaft 1 exceeds the allowable range of the normal value, so that the super capacitor of the shaft 1 needs to be checked and replaced.

Further, when the test result of the shaft 1 is within the allowable range of the normal value, resetting the safety chain, and after resetting the fault information, entering a self-checking state of the shaft 2;

the self-checking state of the shaft 2 specifically includes:

the variable-pitch system automatically drives the shaft 2 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 2 from mains supply to super capacitor power supply, and the shaft 2 emergently retracts to a safety position;

the processing unit acquires second information of the shaft 2, including capacitance voltage, a variable pitch angle, a variable pitch speed, a safety chain and the on-off condition of the charger, and analyzes the second information to obtain second test data including capacitance voltage drop, feathering time and position;

the processing unit compares the second test data with a normal value, if the test result of the shaft 2 is within the allowable range of the normal value, the safety chain is reset, the fault information is reset, if the test result of the shaft 2 exceeds the allowable range of the normal value, the super capacitor of the shaft 2 is determined to be in fault, and the super capacitor of the shaft 2 needs to be checked and replaced;

further, when the test result of the shaft 2 is within the allowable range of the normal value, resetting the safety chain, and after resetting the fault information, entering a self-checking state of the shaft 3;

the self-checking state of the shaft 3 specifically includes:

the variable-pitch system automatically drives the shaft 3 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 3 from mains supply to super capacitor power supply, and the shaft 3 emergently retracts to a safety position;

the processing unit acquires third information of the shaft 3, including capacitance voltage, a variable pitch angle, a variable pitch speed, a safety chain and the on-off condition of a charger, and acquires third test data including capacitance voltage drop, feathering time and blade position from the third information;

and the processing unit compares the third test data with a normal value, resets the safety chain and the fault information if the test result of the shaft 3 is within the allowable range of the normal value, and determines that the super capacitor of the shaft 3 has a fault and needs to check and replace the super capacitor of the shaft 3 if the test result of the shaft 3 exceeds the allowable range of the normal value.

Further, the method also comprises the step 0: and the processing unit remotely sends a self-checking test instruction of the super capacitor to the wind turbine generator set through network communication.

Further, after the processing unit sends the self-checking test instruction of the super capacitor to the wind turbine generator remotely through network communication, the wind turbine generator judges whether the self-checking condition of the super capacitor is met, and the self-checking instruction of the super capacitor is executed under the condition that the self-checking condition of the super capacitor is met.

Further, the condition information that the wind turbine generator meets the self-checking condition of the super capacitor includes:

the running mode of the fan is in a standby state and in a non-untwisting state;

the fan has no global fault and no safety chain fault;

the 10-minute average wind speed of the fan is less than 5 m/s;

the pitch angles of the variable pitch blades are all in safe positions.

Furthermore, the first test data, the second test data and the third test data collected by the processing unit are stored for query and archiving.

The invention has the beneficial effects that:

1. the detection method automatically detects the super capacitor of the variable pitch system of the wind turbine generator, the shaft 1, the shaft 2 and the shaft 3 are sequentially driven to feather, the test method is safe and reliable, and the health state of the super capacitor is automatically identified after the test is finished;

2. the detection method automatically detects the super capacitor of the pitch system of the wind turbine generator, and can effectively improve the speed of fault diagnosis and the precision of fault diagnosis of the pitch super capacitor; the fault downtime of the super capacitor is reduced, the runaway risk of the unit is reduced, the safety of the unit is improved, the manual operation and maintenance cost is reduced, and the power generation rate and the economic benefit are improved.

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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flowchart of a self-inspection analysis method for a supercapacitor of a pitch system of a wind turbine generator according to the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, the self-inspection analysis method for the super capacitor of the pitch system of the wind turbine includes the following steps:

a, a processing unit remotely sends a self-checking test instruction of a super capacitor to a wind turbine generator system through network communication;

b, the wind turbine generator receives a super capacitor self-checking instruction, and the wind turbine generator judges whether the super capacitor self-checking condition is met;

the condition information that the wind turbine generator meets the self-checking condition of the super capacitor comprises the following steps:

the running mode of the fan is in a standby state and in a non-untwisting state;

the fan has no global fault and no safety chain fault;

the 10-minute average wind speed of the fan is less than 5 m/s;

the pitch angles of the variable pitch blades are all in safe positions.

c, if the wind turbine generator does not meet the self-checking condition of the super capacitor, the wind turbine generator enters other modes, if the wind turbine generator meets the self-checking condition of the super capacitor, a self-checking instruction of the super capacitor is executed, a self-checking program of the super capacitor is called, and the wind turbine generator enters the self-checking mode of the super capacitor and enters a self-checking state of a shaft 1;

the self-checking state of the shaft 1 specifically includes:

the variable-pitch system automatically drives the shaft 1 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 1 from commercial power to a super capacitor for power supply, and the shaft 1 emergently retracts to the safety position;

the method comprises the steps that a processing unit acquires first information of a shaft 1, wherein the first information comprises capacitance voltage, a variable pitch angle, variable pitch speed, a safety chain and the on-off condition of a charger, and first test data comprising capacitance voltage drop, feathering time and blade position are obtained from the first information;

d, comparing the first test data with a normal value by the processing unit, if the first test data of the shaft 1 exceeds the allowable range of the normal value, determining that the super capacitor of the shaft 1 is in fault, and giving an alarm by the processing unit to remind that the super capacitor of the shaft 1 needs to be checked and replaced; if the first test data of the shaft 1 is within the allowable range of the normal value, the super capacitor of the shaft 1 is determined to be in a healthy state, then a super capacitor self-checking test report of the shaft 1 is generated, a safety chain is reset, fault information is reset, and the shaft 2 self-checking state is entered;

the self-checking state of the e-axis 2 specifically comprises the following steps:

the variable-pitch system automatically drives the shaft 2 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 2 from mains supply to super capacitor power supply, and the shaft 2 emergently retracts to a safety position;

the processing unit acquires second information of the shaft 2, including capacitance voltage, a variable pitch angle, a variable pitch speed, a safety chain and the on-off condition of the charger, and acquires second test data including capacitance voltage drop, feathering time and blade position from the second information;

the processing unit compares the second test data with a normal value, if the second test data of the shaft 2 exceeds the allowable range of the normal value, the super capacitor of the shaft 2 is determined to be in a fault state, the processing unit sends an alarm to remind that the super capacitor of the shaft 2 needs to be checked and replaced, if the second test data of the shaft 2 is within the allowable range of the normal value, the super capacitor of the shaft 2 is determined to be in a healthy state, a super capacitor self-detection test report of the shaft 2 is generated, a safety chain is reset, fault information is reset, and then the shaft 3 self-detection state is entered;

the self-checking state of the g-axis 3 specifically comprises the following steps:

the variable-pitch system automatically drives the shaft 3 to a 0-degree position, the safety chain is arranged in the false, the variable-pitch system charger is arranged in the false, the variable-pitch system switches the shaft 3 from mains supply to super capacitor power supply, and the shaft 3 emergently retracts to a safety position;

the processing unit acquires third information of the shaft 3, including capacitance voltage, a variable pitch angle, a variable pitch speed, a safety chain and the on-off condition of the charger, and acquires third test data including capacitance voltage drop, feathering time and blade position from the third information;

and the h processing unit compares the third test data with a normal value, if the third test data of the shaft 3 is within an allowable range of the normal value, the super capacitor of the shaft 3 is determined to be in a healthy state, a self-checking test report of the super capacitor of the shaft 3 is generated, the safety chain is reset, fault information is reset, the unit enters a standby state, if the third test data of the shaft 3 exceeds the allowable range of the normal value, the super capacitor of the shaft 3 is determined to be in a fault state, and an alarm is given to remind that the super capacitor of the shaft 3 needs to be checked and replaced.

In a preferred embodiment, the first test data, the second test data and the third test data collected by the processing unit are stored for query and archiving.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.