Unlock instant, AI-driven research and patent intelligence for your innovation.

On-line estimation device and method for impeller fatigue life based on torque real-time observation

A technology of fatigue life and real-time observation, which is applied in the direction of control of electromechanical transmission, control of generators, electronic commutation motor control, etc., and can solve the problems of inapplicable evaluation of impeller fatigue life, etc.

Inactive Publication Date: 2018-06-19
STATE GRID CORP OF CHINA +5
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the existing technology is not suitable for evaluating the fatigue life of the impeller, thereby providing an online estimation device and method for observing the fatigue life of the impeller based on torque in real time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • On-line estimation device and method for impeller fatigue life based on torque real-time observation
  • On-line estimation device and method for impeller fatigue life based on torque real-time observation
  • On-line estimation device and method for impeller fatigue life based on torque real-time observation

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0081] Specific implementation mode one: combine Figure 1 to Figure 3 Describe this embodiment in detail, the online estimation device based on torque real-time observation of impeller fatigue life described in this embodiment, the device includes a voltage sensor 1, a current sensor 2, a two-phase stationary coordinate converter 3, a first torque observer 9. Motor input torque calculator 11, impeller torque calculator 12, impeller load spectrum generator 13, impeller fatigue life estimator 14 and rotational speed sensor 15;

[0082] The voltage sensor 1 senses the three-phase voltage on the stator side and the three-phase voltage on the rotor side, and the current sensor 2 senses the three-phase current on the stator side and the three-phase current on the rotor side;

[0083] The output terminal of the voltage sensor 1 is connected with the voltage input terminal of the two-phase stationary coordinate converter 3, and the output terminal of the current sensor 2 is connected...

specific Embodiment approach 2

[0091] Specific implementation mode two: combination figure 2 with Figure 4 Specifically explain this embodiment, the online estimation device based on torque real-time observation of impeller fatigue life described in this embodiment, the device includes a voltage sensor 1, a current sensor 2, a rotary coordinate converter 4, a phase-locked loop 5, a photoelectric encoder 6. Integrator 7, subtractor 8, second matrix observer 10, motor input torque calculator 11, impeller torque calculator 12, impeller load spectrum generator 13 and impeller fatigue life estimator 14;

[0092] The voltage sensor 1 senses the three-phase voltage on the stator side, and the current sensor 2 senses the three-phase current on the stator side and the three-phase current on the rotor side;

[0093] The output terminal of the current sensor 2 is connected with the current input terminal of the rotary coordinate converter 4;

[0094] The stator three-phase voltage output terminal of the voltage se...

specific Embodiment approach 3

[0106] Specific implementation mode three: combination figure 1 Specifically explain this embodiment, according to the online estimation method of the online estimation device based on the torque-based real-time observation of impeller fatigue life described in the first specific embodiment,

[0107] The method includes the following steps:

[0108] Step 1: The voltage sensor 1 senses the three-phase voltage on the stator side and the three-phase voltage on the rotor side, the current sensor 2 senses the three-phase current on the stator side and the three-phase current on the rotor side; the speed sensor 15 senses the generator speed ω g ;

[0109] Step 2. The two-phase stationary coordinate converter 3 converts the three-phase voltage on the stator side into the stator side voltage u in the stationary coordinate system sα and stator side voltage u sβ , transform the three-phase current on the stator side into the stator side current i in the stationary coordinate system ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An online estimating device and method of observing impeller fatigue service life real-timely based torques relates to an intelligent health state estimation technology of a doubly-fed wind turbine, and are used for solving the problem that the conventional technology is not suitable for estimating the impeller fatigue service life. According to the present invention, an impeller actual moment of inertia obtained by software simulation analysis is transformed into an impeller equivalent moment of inertia, an input torque of a generator is obtained by a generator electromagnetic torque obtained based on the rotating coordinate transformation or the electromagnetic power calculation, a generator rotating speed obtained by a rotating speed sensor is combined to obtain an impeller pneumatic torque, an impeller load spectrum is obtained by a rain flow method and according to the impeller pneumatic torque, and the impeller fatigue service life is estimated according to the impeller load spectrum and an impeller reference load spectrum. The method is simple and easy to realize, does not need the additional sensors, and enables the cost to be reduced and the reliability to be improved. The online estimating device and method of the present invention is suitable for the impeller fatigue service life online estimation.

Description

technical field [0001] The invention relates to an intelligent health state evaluation technology of a doubly-fed wind turbine. Background technique [0002] Wind turbines work in the field environment for a long time and run under load. How to monitor and analyze the status of the turbine is an important aspect to improve the intelligence level of the turbine. Among them, the impeller is an important part of the unit. When the unit is working, the wind energy will generate a huge aerodynamic torque on the impeller, and the mechanical energy generated by this torque will be converted into electrical energy by the generator and sent to the grid. Transfer to the top of the tower, causing the top load. The aerodynamic torque of the impeller reflects the change of the load on the impeller and the top of the tower, and the change of the load will cause the fatigue damage of the material. Therefore, the fatigue life of the impeller can be evaluated according to the monitoring of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/13H02P21/14
CPCH02P21/13H02P21/14
Inventor 杨荣峰苏勋文张学广徐殿国张磊孙运涛
Owner STATE GRID CORP OF CHINA