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Energies 2017, 10(4), 449; doi:10.3390/en10040449

Enhancement of Power System Stability Using a Novel Power System Stabilizer with Large Critical Gain

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Academic Editor: Akhtar Kalam
Received: 2 February 2017 / Revised: 15 March 2017 / Accepted: 23 March 2017 / Published: 1 April 2017
(This article belongs to the Section Electrical Power and Energy System)
View Full-Text   |   Download PDF [4663 KB, uploaded 1 April 2017]   |  

Abstract

Power system stabilizers (PSSs) are widely used for suppressing low frequency oscillations in practical power systems. However, according to the requirement of the “guide for setting test of power system stabilizer” of China, PSS gain is limited to no more than 1/3 of its critical gain. As a result, PSSs may not provide enough damping to the inter-area mode oscillations. Through analyzing the Heffron-Phillips (H-P) model of the generator with PSS, it is found that exciter mode will become unstable when PSS exceeds its critical gain. This exciter mode is formed by the natural characteristic of the exciter-PSS loop. To address this problem, a novel PSS with a parallel component added to the conventional PSS is proposed to improve its critical gain. Therefore, large gain can be chosen for the proposed PSS to meet the critical gain requirements of the guide and provide enough damping to the inter-area modes simultaneously. Simulation results on the Ximeng coal power station of China verify the effectiveness of the proposed PSS. View Full-Text
Keywords: low frequency oscillation; exciter mode; critical gain; power system stabilizer; excitation system low frequency oscillation; exciter mode; critical gain; power system stabilizer; excitation system
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Liu, Z.; Yao, W.; Wen, J. Enhancement of Power System Stability Using a Novel Power System Stabilizer with Large Critical Gain. Energies 2017, 10, 449.

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