CN110700997A - Method for monitoring rotating speed of impeller of wind power pitch control system - Google Patents
Method for monitoring rotating speed of impeller of wind power pitch control system Download PDFInfo
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- CN110700997A CN110700997A CN201911074120.5A CN201911074120A CN110700997A CN 110700997 A CN110700997 A CN 110700997A CN 201911074120 A CN201911074120 A CN 201911074120A CN 110700997 A CN110700997 A CN 110700997A
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- Prior art keywords
- impeller
- acceleration
- control system
- pitch control
- rotating speed
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001133 acceleration Effects 0.000 claims abstract description 106
- 230000005484 gravity Effects 0.000 claims abstract description 24
- 238000001514 detection method Methods 0.000 claims description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/0256—Stall control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/304—Spool rotational speed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a method for monitoring the rotating speed of an impeller of a wind power variable pitch control system, which comprises the following steps: s1: three acceleration sensors are arranged in the variable-pitch control system, and the three acceleration sensors are respectively arranged aiming at the same positions of the three blades; s2: the center of a circle where the three acceleration sensors are located is defined as an origin, and a vertical downward direction passing through the origin is defined as a Z axis; detecting the time period when the gravity acceleration of the three acceleration sensors passing through the Z axis is the same value; s3: calculating the rotating speed S of the impeller; s4: and comparing the rotating speed S of the impeller with an overspeed limit value Smax of the impeller, and when S is larger than Smax, disconnecting a safety chain of a variable pitch control system and executing a feathering action. The impeller rotating speed can be monitored, the monitoring real-time performance, the reliability and the response speed are improved, and the safety performance of the fan is improved.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a method for monitoring the rotating speed of an impeller of a wind power pitch control system.
Background
The pitch control system is one of core components of the wind generating set, and the reliable operation of the pitch control system is a powerful guarantee for the normal operation of the wind generating set. The traditional fan impeller rotating speed detection is carried out on the engine room side of a fan, a rotating speed detection device such as an encoder or a rotating speed sensor is arranged on a low-speed shaft for monitoring, monitoring data are uploaded to a main control system, the rotating speed of the impeller is judged in an overspeed mode, and the rotating speed is transmitted to a variable pitch control system through a sliding ring.
However, the encoder is easily interfered, so that the machine set is shut down due to frequent false alarm of impeller overspeed, the stability of the machine set is influenced, the encoder is expensive, the maintenance cost is high, and the test error of the encoder is large when the rotating speed is low; moreover, the slip ring is used for transmitting the signals to the variable-pitch control system, and when the slip ring goes wrong, the variable-pitch control system cannot judge the overspeed fault of the impeller, so that the safety of the fan is affected.
Disclosure of Invention
To the deficiency of the prior art, the technical problem to be solved by the present patent application is: how to provide a method for monitoring the rotating speed of an impeller of a wind power variable pitch control system, which is used for monitoring the rotating speed of the impeller, improving the real-time performance, reliability and response speed of monitoring, and improving the safety performance of a fan.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for monitoring the rotating speed of an impeller of a wind power variable pitch control system comprises the following steps:
s1: three acceleration sensors are arranged in the variable-pitch control system, and the three acceleration sensors are respectively arranged aiming at the same positions of the three blades;
s2: the center of a circle where the three acceleration sensors are located is defined as an origin, and a vertical downward direction passing through the origin is defined as a Z axis; detecting the time period when the gravity acceleration of the three acceleration sensors passing through the Z axis is the same value;
s3: calculating the rotating speed S of the impeller;
s4: and comparing the rotating speed S of the impeller with an overspeed limit value Smax of the impeller, and when S is larger than Smax, disconnecting a safety chain of a variable pitch control system and executing a feathering action.
Further, in step S2, the gravity acceleration is g ± 2%.
Further, in step S2, the time period is located as: the time elapsed between the time when the acceleration sensor of one of the blades detects the value of the gravitational acceleration and the time when the acceleration sensor of the next blade in the rotational direction of the blades detects the value of the gravitational acceleration.
Further, in step S3, the following equation is used to calculate the impeller rotation speed S:
wherein, tnComprises the following steps: when the detection is initial, firstly, the time when the acceleration sensor of the Z axis detects the gravity acceleration is passed;
tn+1comprises the following steps: the time when the second acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
tn+2comprises the following steps: the time when the third acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
Further, the acceleration sensor is an acceleration sensor arranged in a driver of the pitch control system.
Further, the acceleration sensor is an acceleration sensor arranged in a controller of the pitch control system.
The invention has the following beneficial effects:
1. the variable pitch control system can directly judge the overspeed fault of the impeller so as to carry out feathering action, ensure the safety of the fan, and ensure quicker response, safer and more reliable.
2. The variable-pitch control system can be used for realizing the operation without adding hardware equipment, and has the advantages of simple structure, strong operability and low cost.
3. The method can complete the monitoring of the rotating speed of the impeller on the impeller side, and is more direct and more time-efficient.
4. The problem that the impeller overspeed fault cannot be judged by the variable-pitch control system when the slip ring fails can be effectively avoided, and the safety and reliability performance are improved.
Drawings
In FIG. 1, a is a time t when the acceleration sensor of 1# blade passing through the Z axis first detects the gravitational acceleration at the initial detectionn(ii) a b is expressed as the time t when the acceleration sensor of 2# blade passing through the Z axis detects the gravity acceleration along the rotation direction of the impellern+1(ii) a c is expressed as the time t when the acceleration sensor of the 3# blade passing through the Z axis detects the acceleration of gravity along the rotation direction of the impellern+2(ii) a d is the time when the acceleration of gravity is detected when the 1# blade passes the acceleration sensor of the Z axis and rotates again to the Z axis direction along the rotation direction of the impeller
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The first embodiment is as follows:
referring to the attached figure 1 of the specification, the method for monitoring the rotating speed of the impeller of the wind power pitch control system comprises the following steps:
s1: the three acceleration sensors are arranged on a driver in a control cabinet in the variable-pitch control system and are respectively arranged aiming at the same positions of the three blades;
s2: the center of a circle where the three acceleration sensors are located is defined as an origin, and a vertical downward direction passing through the origin is defined as a Z axis; detecting the time period when the gravity acceleration of the three acceleration sensors passing through the Z axis is the same value, namely g +/-2%; the time period is located as: the time elapsed between the moment when the acceleration sensor of one of the blades detects the value of the gravitational acceleration and the moment when the acceleration sensor of the next blade in the rotation direction of the blades detects the value of the gravitational acceleration;
s3: calculating the rotating speed S of the impeller; using the following formula:
wherein, tnComprises the following steps: when the detection is initial, firstly, the time when the acceleration sensor of the Z axis detects the gravity acceleration is passed;
tn+1comprises the following steps: the time when the second acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
tn+2comprises the following steps: the time when the third acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
comprises the following steps: along the impeller rotating directionAnd the time when the acceleration sensor passing through the Z axis rotates to the Z axis direction again and the gravity acceleration is detected.
S4: and comparing the rotating speed S of the impeller with an overspeed limit value Smax of the impeller, and when S is larger than Smax, disconnecting a safety chain of a variable pitch control system and executing a feathering action.
Example two:
referring to the attached figure 1 of the specification, the method for monitoring the rotating speed of the impeller of the wind power pitch control system comprises the following steps:
s1: the three acceleration sensors are arranged in a controller in the variable pitch control system and are respectively arranged aiming at the same positions of the three blades;
s2: the center of a circle where the three acceleration sensors are located is defined as an origin, and a vertical downward direction passing through the origin is defined as a Z axis; detecting the time period when the gravity acceleration of the three acceleration sensors passing through the Z axis is the same value, namely g +/-2%; the time period is located as: the time elapsed between the moment when the acceleration sensor of one of the blades detects the value of the gravitational acceleration and the moment when the acceleration sensor of the next blade in the rotation direction of the blades detects the value of the gravitational acceleration;
s3: calculating the rotating speed S of the impeller; using the following formula:
wherein, tnComprises the following steps: when the detection is initial, firstly, the time when the acceleration sensor of the Z axis detects the gravity acceleration is passed;
tn+1comprises the following steps: the time when the second acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
tn+2comprises the following steps: the time when the third acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
S4: and comparing the rotating speed S of the impeller with an overspeed limit value Smax of the impeller, and when S is larger than Smax, disconnecting a safety chain of a variable pitch control system and executing a feathering action.
Specifically, the acceleration sensor needs to be arranged in the variable pitch control system and rotates along with the impeller, and the specific installation position is not limited.
Example three:
an acceleration sensor is arranged in a driver of the variable pitch control system, and the acceleration in the Z-axis direction can be monitored. The driver is installed in a control cabinet of a variable pitch control system, the driver rotates along with the impeller in the operation process of the wind generating set, when one blade rotates to a position where the blade is vertical to the ground, namely an acceleration sensor passes through a Z axis, the acceleration of the driver driving the blade in the Z axis direction is just equal to the gravity acceleration or meets the gravity acceleration, namely g +/-2%, when the fan is installed, the acceleration of the driver in the Z axis direction when each blade is in the position vertical to the ground is calibrated, and three blades are named as a 1# blade, a 2# blade and a 3# blade respectively; and recording that the Z-axis acceleration is g1 when the 1# blade is vertical to the ground, the Z-axis acceleration is g2 when the 2# blade is vertical to the ground, the Z-axis acceleration is g3 when the 3# blade is vertical to the ground, and storing g1, g2 and g3 in a power-down maintaining unit of the variable pitch control system controller.
When the fan is in operation, when the acceleration a1 of the Z axis of the 1# blade is monitored to be g1 ± 2% (considering a certain error in the rotation process), the time is recorded as t1, when the acceleration a2 of the Z axis of the 2# blade is monitored to be g2 ± 2%, the time is recorded as t2, when the acceleration a3 of the Z axis of the 3# blade is monitored to be g3 ± 2%, the time is recorded as t3, when the acceleration a1 of the Z axis of the 1# blade is monitored to be g1 ± 2%, the time is recorded as t 1' (when the impeller just rotates one circle), and the impeller speed is calculated:
when the Z-axis acceleration of the 2# blade is detected again at a1 ═ g1 ± 2%, the time at this time is recorded as t 2', and the impeller speed is calculated:
when the Z-axis acceleration of the 3# blade is detected again at a1 ═ g1 ± 2%, the time at this time is recorded as t 3', and the impeller speed is calculated:
the rotation speed of the impeller can be calculated in real time through circulation, and rotation speed monitoring is achieved.
When the variable pitch control system monitors that S is larger than the impeller rotating speed overspeed limit value Smax, the safety chain of the variable pitch control system is disconnected, feathering is executed, and unit safety is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A method for monitoring the rotating speed of an impeller of a wind power variable pitch control system is characterized by comprising the following steps:
s1: three acceleration sensors are arranged in the variable-pitch control system, and the three acceleration sensors are respectively arranged aiming at the same positions of the three blades;
s2: the center of a circle where the three acceleration sensors are located is defined as an origin, and a vertical downward direction passing through the origin is defined as a Z axis; detecting the time period when the gravity acceleration of the three acceleration sensors passing through the Z axis is the same value;
s3: calculating the rotating speed S of the impeller;
s4: and comparing the rotating speed S of the impeller with an overspeed limit value Smax of the impeller, and when S is larger than Smax, disconnecting a safety chain of a variable pitch control system and executing a feathering action.
2. The method for monitoring the rotating speed of the impeller of the wind power pitch control system according to claim 1, wherein in the step S2, the value of the gravitational acceleration is g ± 2%.
3. The method for monitoring the rotating speed of the impeller of the wind power pitch control system according to claim 1, wherein in step S2, the time period is located as follows: the time elapsed between the time when the acceleration sensor of one of the blades detects the value of the gravitational acceleration and the time when the acceleration sensor of the next blade in the rotational direction of the blades detects the value of the gravitational acceleration.
4. The method for monitoring the rotating speed of the impeller of the wind power pitch control system according to claim 1, wherein in the step S3, when the rotating speed S of the impeller is calculated, the following formula is used for performing:
wherein, tnComprises the following steps: when the detection is initial, firstly, the time when the acceleration sensor of the Z axis detects the gravity acceleration is passed;
tn+1comprises the following steps: the time when the second acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
tn+2comprises the following steps: the time when the third acceleration sensor passing through the Z axis detects the gravity acceleration along the rotation direction of the impeller;
5. The method for monitoring the rotating speed of the impeller of the wind power pitch control system according to claim 1, wherein the acceleration sensor is an acceleration sensor arranged in a driver of the pitch control system.
6. The method for monitoring the rotating speed of the impeller of the wind power pitch control system according to claim 1, wherein the acceleration sensor is an acceleration sensor arranged in a controller of the pitch control system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911074120.5A CN110700997A (en) | 2019-11-06 | 2019-11-06 | Method for monitoring rotating speed of impeller of wind power pitch control system |
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| CN201911074120.5A CN110700997A (en) | 2019-11-06 | 2019-11-06 | Method for monitoring rotating speed of impeller of wind power pitch control system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112761872A (en) * | 2021-01-25 | 2021-05-07 | 三一重能股份有限公司 | Wind power variable pitch overspeed protection method and device and wind power variable pitch system |
| CN112855465A (en) * | 2021-01-29 | 2021-05-28 | 陕西中科启航科技有限公司 | Impeller rotating speed fault-tolerant monitoring method and system based on flange gap sensor |
| CN112855433A (en) * | 2021-01-29 | 2021-05-28 | 陕西中科启航科技有限公司 | Method for measuring rotating speed and rotation angle position of impeller by using acceleration sensor |
| CN113153631A (en) * | 2021-04-09 | 2021-07-23 | 北京国电思达科技有限公司 | Overspeed prevention system and method for impeller of wind turbine generator |
| CN113482862A (en) * | 2021-07-07 | 2021-10-08 | 陕西中科启航科技有限公司 | Wind turbine generator running state monitoring method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113153631A (en) * | 2021-04-09 | 2021-07-23 | 北京国电思达科技有限公司 | Overspeed prevention system and method for impeller of wind turbine generator |
| CN113482862A (en) * | 2021-07-07 | 2021-10-08 | 陕西中科启航科技有限公司 | Wind turbine generator running state monitoring method and system |
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