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positive- and zero-sequence impedance estimation of YNyn0+d-Connected Main Power Transformers in Wind Power Applications

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 57-65页

作者： Franklin L.Quilumba Robert E.Jimerson Ken Swift Rafael Garc´ıa with Oncor Electric Delivery Fort WorthTX 76102 USA

With the increased penetration of non-conventionalrenewable energy resources, such as wind power plants (WPPs),into the power system, a lot of interest has been placed on studyingtheir impact for system protection, planning and operationsto ensure continued reliability of the electric grid. The impactof WPPs on the grid is typically identified during generationinterconnection studies. One of the challenges faced by protectionand planning engineers, at an early stage in this process, isthat many of the studies involving these power plants must beperformed without specific data available because the equipmentis not built yet. Among all the needed data, a particular interest inthis study is placed on the positive- and zero-sequence impedancesof the main power transformer (MPT) that interconnects a windpower plant to the transmission system due to its contribution toshort-circuit current during ground faults. The most commonlyfound in practice MPT winding configurations is a high-voltagewinding in wye with neutral bushing;a low-voltage windingin wye with neutral bushing without phase shift between thesewindings, and a stabilizing tertiary winding connected in deltathat is not designed for external loading designated as YNyn0+***, this paper proposes a methodology to estimate the sequenceimpedances of YNyn0+d transformers from a statistical point ofview applying clustering and regression analyses on existing MPTtest report data.

关键词： positive-and zero-sequence impedance estimation power transformers short-circuit analysis threewinding transformer with buried tertiary wind power integration

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