The residual life prediction of power grid transformers based on GA-ELM computational model and digital twin data

Xiangshang Wang; Chunlin Li; Jianguang Zhang

doi:10.4108/ew.4896

Authors

Xiangshang Wang Beijing North-Star Technology Development CO., LTD
Chunlin Li Beijing North-Star Technology Development CO., LTD
Jianguang Zhang Beijing North-Star Technology Development CO., LTD

DOI:

https://doi.org/10.4108/ew.4896

Keywords:

Transformer, Power grid, Digital twin, Genetic algorithm, Extreme learning machine

Abstract

As one of the core equipment of the power grid, the operation status of transformers directly affects the stability and reliability of the power system. To accurately evaluate the remaining life of power grid transformers, a genetic algorithm is applied to optimize the Extreme Learning Machine based on digital twin technology. Then, considering changes in load rate, a residual life prediction model for power grid transformers is constructed. From the results, the error of the research method was within 2℃, with a maximum error of only 1.76℃. The research model converged with a fitness value of 0.04 at 150 iterations. It showed good predictive performance for hot spot temperatures under different load rates, with an average accuracy of 99.97%. Compared with backpropagation models and extreme learning machine models, the research method improved accuracy by 2.85% and 1.01%, respectively, with small and stable prediction errors. It verified the superiority of the research model, indicating that the research method can improve the accuracy of predicting the remaining life for power grid transformers. By monitoring the operation status of transformers in real-time, potential faults can be detected in a timely manner. The maintenance and replacement can be carried out in advance to avoid power outages caused by equipment damage. In addition, the research can provide reference for the planning and design of power systems, and support the stability and reliability of power systems.

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