Nonlinear modal interaction in HVDC/AC power systems with DC power modulation

1996 ◽  
Vol 11 (4) ◽  
pp. 2011-2017 ◽  
Author(s):  
Y.-X. Ni ◽  
V. Vittal ◽  
W. Kliemann ◽  
A.A. Fouad
Keyword(s):  
Power Systems ◽  
Modal Interaction ◽  
Power Modulation ◽  
Dc Power ◽  
Ac Power ◽  
Nonlinear Modal Interaction

scholarly journals Fast Heuristic AC Power Flow Analysis with Data-Driven Enhanced Linearized Model

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3308
Author(s):  
Xingpeng Li
Keyword(s):  
Power Systems ◽  
Power System ◽  
Power Flow ◽  
Flow Model ◽  
Reactive Power ◽  
Unit Commitment ◽  
Flow Analysis ◽  
Data Driven ◽  
Dc Power ◽  
Ac Power

Though the full AC power flow model can accurately represent the physical power system, the use of this model is limited in practice due to the computational complexity associated with its non-linear and non-convexity characteristics. For instance, the AC power flow model is not incorporated in the unit commitment model for practical power systems. Instead, an alternative linearized DC power flow model is widely used in today’s power system operational and planning tools. However, DC power flow model will be useless when reactive power and voltage magnitude are of concern. Therefore, a linearized AC (LAC) power flow model is needed to address this issue. This paper first introduces a traditional LAC model and then proposes an enhanced data-driven linearized AC (DLAC) model using the regression analysis technique. Numerical simulations conducted on the Tennessee Valley Authority (TVA) system demonstrate the performance and effectiveness of the proposed DLAC model.

scholarly journals Fundamental Study of Oscillations in the Nigerian Power System

2021 ◽  
Author(s):  
Nnaemeka Sunday UGWUANYI ◽  
Uma Uzubi Uma ◽  
Arthur Obiora Ekwue
Keyword(s):  
Power Systems ◽  
Power System ◽  
Low Frequency ◽  
Modal Interaction ◽  
Modal Interactions ◽  
Fundamental Study ◽  
Power Stations ◽  
Nonlinear Modal Interaction ◽  
Stability Limits ◽  
Comprehensive Study

The power systems in developing countries are usually stressed and operated near their stability limits. Consequently, accurate sources of oscillations and their controls can present a challenge. This paper reports a comprehensive study of the oscillations in the Nigerian 48-bus power system. The dominant modes, sensitive locations for faults, and the most responsible generators were identified by modal analysis. Uniquely, the potential for nonlinear modal interaction of these modes was carefully investigated. The low-frequency modes identified are 1 Hz, 1.14 Hz, and 1.37 Hz, and they are associated mainly with the generators at Kainji, Afam, and Delta power stations. The results indicate the existence of inter-area phenomena and nonlinear modal interactions among these modes. Also, the analysis revealed that the generator at the Kainji power station is most affected by the nonlinear interactions.<br>

Research on Stator Winding Leakage Reactance Calculation of Double-Winding AC-DC Generator

2011 ◽  
Vol 383-390 ◽  
pp. 6861-6867
Author(s):  
Xu Sheng Wu ◽  
Wei Gao
Keyword(s):  
Power Systems ◽  
Electrical Power ◽  
Magnetic Potential ◽  
Stator Winding ◽  
Test Results ◽  
Electrical Power Systems ◽  
Dc Power ◽  
Ac Power ◽  
Three Phase ◽  
Bridge Rectifier

Double-winding AC-DC Generator are being widely used in self-contained electrical power systems for their obvious virtues. On their stator, two separate windings are distributed, one three-phase winding delivers AC power and the other twelve-phase winding, termed DC windings, are connected to the bridge rectifier to supply DC power. Unlike ordinary three-phase machines, there are four layers winding in each stator slot of the Double-winding AC-DC Generator and the total gap magnetic potential produced by the twelve-phase winding is more complex than 3-phase machines. By analyzing the leakage magnetic flux and the magnetic potential, relevant formulas are derived to calculate the leakage reactance of the machines. All the stator leakage reactance of a realistic Double-winding AC-DC Generator was calculated through the methods presented and the simulation of a sudden shortcut test of the machine was carried out with the parameters calculated. The simulation and test results agree quite well, and show that the formulas presented are correct.

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