A Research on Generators with Constant of Active Power and Variation of Excitation Current in Thermal Power Plant

Nguyen Thi Thu Huong
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Nguyen Thi Thu Huong: Electrical Faculty, Thai Nguyen University of Technology, Thai Nguyen, Viet Nam

International Journal of Research and Scientific Innovation, 2021, vol. 8, issue 9, 01-05

Abstract: This paper presents a method to determine critical points to adjust operating parameters for a thermal generator in case of constant of active power and variation of excitation current. Operating thresholds corresponding to above points are defined by maximum reactive power generating to the power system (positive), zero reactive power and maximum reactive power absorbing from the power system (negative). Curves representing the relation between power factors, angle of electromotive cross force and reactive power are also created in this paper corresponding to above operating points. Due to exactly determining critical points in this case, an algorithm is also proposed to help the controller have correct thresholds to adjust the excitation current for parallel couple of a thermal generator and the power system. This paper also presents a detailed calculation for a thermal generator having 57.5 MW rated active power to illustrate the proposed method. Calculation results showed the meaning of the proposed method to create a full and clear profile for any thermal generator that helps to control and dispatch power systems.

Date: 2021
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