Milling stability analysis with simultaneously considering the structural mode coupling effect and regenerative effect

Impedance-based stability analysis is an effective method for addressing a new type of SSO accidents that have occurred in recent years, especially those caused by the control interaction between a DFIG and the power grid. However, the existing impedance modeling of DFIGs is mostly focused on a single converter, such as the GSC or RSC, and the influence between the RSC and GSC, as well as the frequency coupling effect inside the converter are usually overlooked, reducing the accuracy of DFIG stability analysis. Hence, the entire impedance is proposed in this paper for the DFIG-based WECS, taking coupling factors into account (e.g., DC bus voltage dynamics, asymmetric current regulation in the dq frame, and PLL). Numerical calculations and HIL simulations on RT-Lab were used to validate the proposed model. The results indicate that the entire impedance model with frequency coupling is more accurate, and it is capable of accurately predicting the system’s possible resonance points.

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On the Effect and Analysis of Fluid-Structural Mode Coupling

10.1115/1.0003319v ◽

2021 ◽

Author(s):

Mani Sadeghi ◽

Huan-Min Shang ◽

Ming-Ta Yang ◽

Eric Grover

Keyword(s):

Mode Coupling ◽

Structural Mode

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Two novel prediction methods for milling stability analysis based on piecewise polynomial interpolations

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-020-05692-1 ◽

2020 ◽

Vol 109 (7-8) ◽

pp. 2113-2132

Author(s):

Anmin Liu ◽

Yi Wu ◽

Bin Deng ◽

Tuo Ye

Keyword(s):

Stability Analysis ◽

Prediction Methods ◽

Piecewise Polynomial ◽

Milling Stability

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Mode coupling effect in infrared spectra of Tl-based cuprates

Physica C Superconductivity ◽

10.1016/j.physc.2007.03.412 ◽

2007 ◽

Vol 460-462 ◽

pp. 908-911

Author(s):

Y.C. Ma ◽

N.L. Wang

Keyword(s):

Infrared Spectra ◽

Mode Coupling ◽

Coupling Effect

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Stability Analysis of Tunnel Surrounding Rock Based on Coupled Fluid-Solid Theory

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.1900 ◽

2011 ◽

Vol 90-93 ◽

pp. 1900-1903

Author(s):

Fu Ming Wang ◽

Xiao Long Li ◽

Yan Hui Zhong ◽

Xiao Guang Chen

Keyword(s):

Stability Analysis ◽

Plastic Zone ◽

Coupling Effect ◽

Plastic Zone Size ◽

Wall Rock ◽

Surrounding Rock ◽

Maximum Deformation ◽

Calculation Results ◽

The Stability ◽

Tunnel Depth

Taking Chaijiazhuang Tunnel of Lingnan Expressway as project background, the stability analysis of surrounding rock was performed based on the coupled fluid-solid theory. The distributions of stress field, displacement field and plastic zone of rock mass after excavation of tunnel were discussed considering coupled effect between flow and stress under the condition of different rock level and tunnel depth. Compared with the calculation results of not considering coupling effect, the maximum deformation, maximum principle stress and plastic zone size of wall rock were obviously increased when considering coupling effect, which showed a remarkable influence of coupled fluid-solid effect on the stability of tunnel surrounding rock. Some conclusions were drawn and may provide some guidance to the design and construction of tunnels in water-rich strata.

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