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Calculation of Short-Circuit Current of Doubly-Fed Variable-Speed Pumped Storage Unit
ID：127 View Protection：ATTENDEE Updated Time：2022-05-17 09:05:11 Hits：324 Poster Presentation

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Abstract
The calculation of short-circuit current of doubly-fed variable-speed pumped storage unit (DFVSPSU) is studied, this paper studies the analytical expression of short-circuit current from the flux transient process. Based on the transient analysis method of three-phase short-circuit current of DFVSPSU, this paper firstly establishes the mathematical model of DFVSPSU and the transient equivalent circuits of stator and rotor when three-phase short-circuit fault occurs in the grid. The transient process of stator and rotor flux faults is analyzed, and then the expressions of steady-state and transient components of stator flux after faults are obtained. On this basis, the expression of three-phase short-circuit current of DFVSPSU is derived. Simulation verifies the accuracy of the three-phase current expression proposed in this paper. This paper studies the influence of the distance between the short-circuit point and DFVSPSU on the feedback short-circuit current under pumping operation mode, and proposes the distance of short-circuit point that can ignore the influence of feedback short-circuit current, which provides technical support for safe and stable operation of pumped storage power station.
 
Keywords
Doubly-fed variable-speed pumped storage unit;different working conditions;feedback current;three-phase short-circuit current;voltage drop
Speaker
DaiTao
河海大学

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Important Date

  • Conference Date

    May 27

    2022

    to

    May 29

    2022

  • Feb 28 2022

    Draft paper submission deadline

  • May 29 2022

    Registration deadline

  • Jun 22 2022

    Contribution Submission Deadline

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