基于本征正交分解和克里金代理模型的油浸式变压器绕组温度场快速计算方法

doi:10.19595/j.cnki.1000-6753.tces.240544

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Abstract

In order to quickly obtain the temperature distribution and hot spots of the windings of oil immersed power transformers under various operating conditions, this paper proposes a fast calculation method based on the combination of the proper orthogonal decomposition (POD) and Kriging surrogate model (KSM). Firstly, based on the POD reduction method, the discrete equation system of the transformer temperature field was reduced. Through eigenvector decomposition, a set of orthogonal eigenvectors and corresponding eigenvalues were obtained, and these eigenvectors were arranged in descending order according to the size of the eigenvalues. A small number of optimal modes were selected to approximate the full order model, thereby reducing the model order and accelerating the solution speed; Secondly, analyzed the factors affecting the hot spot temperature of transformer windings, determined important operating parameters, and formed an operating parameter matrix or sample space through Latin hypercube sampling; Then, taking the operating parameters as input and modal coefficients as output, 50 sets are taken as the training set in the sample space. Based on the KSM method, a surrogate model was constructed for the sample space and corresponding modal coefficients. Equ.(13) in the text is the specific function expression of the surrogate model. This method uses the Kriging function to describe the correlation between data points by constructing a covariance function, which can accurately predict the data values of unknown points. Faced with the temperature field problem of windings under new operating conditions, the corresponding POD modal coefficients can be obtained through a surrogate model, and the full field data can be quickly obtained through modal reconstruction, bypassing the complex nonlinear calculation of the full order model and achieving rapid calculation of transformer winding temperature. Finally, to verify the effectiveness of the method, an eight zone numerical heat transfer model for the winding of a 110 kV oil immersed transformer was established, and the algorithm was compared with the calculation results of the simulation software Fluent. The results show that for the selected 50 test conditions, the maximum average absolute error is 1.19℃ and the maximum relative error is 2.79%. In terms of computational efficiency, the method proposed in this paper improves the computational efficiency to 13.39 times that of the full order model. If preprocessing time is not considered, it only takes 0.006 seconds to calculate the corresponding results for a certain condition. To verify the engineering application value of the method proposed in this paper, a temperature rise experimental platform based on product level oil immersed transformer winding structure was constructed. The temperature rise of the winding under certain operating conditions was measured and recorded, and the algorithm calculation results were compared with the experimental results. The calculation errors were all within an acceptable range, verifying the engineering application value of the POD-KSM reduced order model. At the same time, to demonstrate the superiority of the proposed method compared to existing methods, error analysis was conducted on the simulation and experimental results. The results showed that the proposed method outperformed existing methods in terms of computational accuracy and efficiency. The calculation method for steady-state temperature field of transformers proposed in this article can provide technical support for digital operation and maintenance of transformers.

Key words： Oil immersed power transformer temperature field proper orthogonal decomposition Kriging surrogate model

Received: 08 April 2024

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TM411

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	Zhang Zhiyu
	Kou Jiajun
	Zhang Zhongyuan
	Du Zhenbin
	Liu Gang

Cite this article:

Zhang Zhiyu,Kou Jiajun,Zhang Zhongyuan等. A Fast Calculation Method for Temperature Field of Oil Immersed Transformer Windings Based on Proper Orthogonal Decomposition and Kriging Surrogate Model[J]. Transactions of China Electrotechnical Society, 0, (): 2492931-2492931.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.240544 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/2492931

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