1.College of Civil Engineering,Hunan University,Changsha 410082,China
2.State Key Laboratory of Bridge Safety and Resilience,Hunan University,Changsha 410082,China
3.Institute of Disaster Prevention and Reduction Technology for Power Grid Facilities,State Grid Electric Power;Engineering Research Institute,Beijing 100069,China
4.Electric Power Research Institute,State Grid Inner Mongolia Eastern Electric Power Co. ,Ltd. ,Hohhot 010010,China
The icing of transmission conductors alters their aerodynamic characteristics, potentially leading to conductor galloping. Addressing the limitations of traditional wind tunnel tests—such as high costs and narrow variable coverage—as well as the low accuracy and long computation time of computational fluid dynamics (CFD) simulations, this study establishes a multi-parameter database based on existing wind tunnel data, incorporating factors such as ice thickness, conductor diameter, wind attack angle, and turbulence intensity. Using algorithms including multiple nonlinear regression (MNR), decision tree regression (DTR), and Gaussian process regression (GPR), high-precision prediction models for the aerodynamic coefficients of iced conductors under multi-parameter coupling effects are developed, overcoming the limitations of traditional single-variable polynomial fitting methods. Comparative analysis in MATLAB shows that the GPR model achieves the highest accuracy (R2>0.98) with slightly lower computational efficiency, the DTR model achieves R2>0.96 with optimal efficiency, and the MNR model achieves R2>0.908 but with a complex expression. Galloping simulations of iced conductors, based on aerodynamic coefficients predicted by the GPR and DTR models, reveal multi-modal coupled vibrations dominated by low-frequency oscillations. The amplitudes of vertical and horizontal galloping increase with ice thickness, while comparisons with wind tunnel data indicate that errors in galloping amplitude and frequency are both below 10%. Using the established aerodynamic coefficient prediction models and simulation procedures, galloping simulations of practical engineering cases effectively reproduce field-observed galloping amplitudes, frequencies, and vibration modes. This demonstrates the practical application value of the proposed methodology for predicting galloping in engineering contexts.
新月形覆冰单导线的气动力系数随特征参数的变化呈现显著非线性特征,且在某些特定攻角范围内存在局部尖峰现象,如图1(a)(c)所示. 针对此类多参数的非线性关系建模,现有方法可分为两类:显式回归算法与隐式回归算法. 本文采用上述两类方法进行覆冰导线气动力系数的建模,其中显式回归算法采用多元非线性回归模型,其原理是通过构建多项式函数实现参数化表达,优点在于可以构建明确的函数表达式,便于解析应用;隐式回归算法采用高斯过程回归(Gaussian process regression,GPR)与决策树回归(decision tree regression,DTR),此类模型通过数据驱动方式建立特征参数与目标变量的映射关系,虽缺乏具体的函数关系式,但具有更强的非线性拟合能力与泛化性能.
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基金资助
国家电网公司总部科技项目(5108-202218280A-2-352-XG)
Science and Technology Project of State Grid Corporation of China(5108-202218280A-2-352-XG)