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Dynamic voltage stability analysis is mainly based on the time-domain solution of power system differential and algebraic equations. The modeling of each power element has a great influence on the correctness and complexity of stability analyzing. It is significant to model appropriately for simplifying calculation and drawing out principal contradiction. In this paper, the dynamical mechanism of...
Dynamic voltage stability analysis is mainly based on the time-domain solution of power system differential equations. The modeling of each power element has a great influence on the correctness and complexity of stability analyzing. It is a significant work to model appropriately for simplifying calculation and drawing out principal contradiction. Firstly, the dynamical mechanism of voltage stability...
Voltage stability is one of the aspects of the power system stability. Since regulating transformers are more and more used in modern power system, tap change has often been considered as a principal mechanism that may lead to voltage collapse, but tap change can also rescue a would-be collapse system by extending the power transfer limit. Using time domain medium-and-long term voltage stability simulation...
The conventional dynamic phasor models of HVDC systems based on Damping Trapezoidal Integration technique are liable to numerical oscillations occurred when the network architecture changes. In order to solve this problem, this paper firstly conducts theoretical analysis on the causes of numerical oscillations resulted from the use of the conventional dynamic phasor models of HVDC systems. Secondly,...
Appropriate modeling of dynamic loads is of primary importance in voltage stability studies, especially increasing use of induction machines in both consumption and generation. This paper is mainly related to short-term voltage instability depending on time domain simulation. The actuality of voltage instability research is summarized, and the mechanisms of short- term voltage stability are explained...
Centralized control using the wide-area information has been suggested to enhance the dynamic performance of large interconnected power systems. According to the inverse system method and LQR optimal control theory, this paper presents a nonlinear hierarchical global controller based on the wide-area information including the on-line measured center of rotor angle and total unbalanced power. Moreover,...
A novel and effective technique for discriminating fault current from inrush current based on wavelet de-noising is presented in the paper. Internal fault current, external fault current and inrush current exhibit distinct characteristics through the detecting of fault skips. Based on these, a criterion which proved to provide to be reliable, fast, and computationally efficient has been developed...
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