In order to evaluate the impact of wind farm and photovoltaic (PV) power station on the operation risk of output transformer,
the joint probability density distribution of wind power and load, PV and load as well as wind power, PV and load are
established by Copula theory. Based on Susa model, the probability density distribution of characteristic temperature of
transformers is derived. For the assessment of the operational risk of transformer, this paper constructs IDP, IFP, ELOIL
indexes. Finally, a sending grid with renewable energy base is taken as an example. of which the relevant risk assessment
indexes are analysed to verify the accuracy of the proposed method. Moreover, the results can provide guidance for the
selection and operation of transformers.
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