Electric Power ›› 2018, Vol. 51 ›› Issue (7): 61-67.DOI: 10.11930/j.issn.1004-9649.201703046

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Study on ABB UNITROL 6800 Excitation System Field Test and Modeling

JIANG Wei   

  1. State Grid Fujian Electric Power Research Institute, Fuzhou 350007, China
  • Received:2017-03-23 Revised:2018-03-14 Online:2018-07-05 Published:2018-07-31
  • Supported by:
    This work is supported by the Science and Technology Project of Fujian Provincial People's Government (No.2015H0023) and the Science and Technology Project of State Grid Fujian Electric Power Company (No.52130417000J).

Abstract: An exact mathematic model of generator excitation system is proposed for ABB UNITROL 6800 excitation system transient stability simulation, which considers the gain error caused by thyristor phase-shifting. In addition, a field test method based on small signal step is proposed to measure the open-loop static gains of excitation systems. A formula is also given to calculate this gain. An actual generator excitation field test shows that the gain of the UNITROL 6800 excitation system caused by phase-shifting is related to the set of air gap magnetic field current, and is proportional to the voltage magnitude of the thyristor anode.

Key words: UNITROL 6800, excitation system modeling, cosine phase-shift, open-loop static gain

CLC Number: