Digital twinning method for monitoring operation state of tower of wind turbine generator system online

A digital twinning method for monitoring an operation state of a tower of a wind turbine generator system online, comprising:

• step 1, obtaining a simplified physical model of the tower of the wind turbine generator system according to geometrical characteristics of the tower of the wind turbine generator system, and analyzing an actual stress condition of the tower to construct a finite element model of the tower;
• step 2, carrying out order reduction analysis on the finite element model constructed in step 1 according to proper orthogonal decomposition (POD), comparing precision of a reduced-order model under different orders, and determining a final reduced order, wherein the final reduced order satisfies engineering requirements of the reduced model under the order;
• and
• step 3, designing and constructing upper computer software in a computer, and deploying the reduced-order model of the tower to the upper computer software;
• building a physical entity of the tower, installing a strain sensor and an inclination sensor, reading sensor data and uploading the data to an upper computer through a single chip microcomputer, so as to convert the data into a displacement boundary condition, and then inputting the displacement boundary condition into the reduced-order model for calculation;
• and determining accuracy of the digital twinning method for monitoring the operation state of the tower by calculating an error between a measured strain value of the strain sensor and a calculated strain value of the reduced-order model in the upper computer.