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Subharmonic resonance occurrence in power system more frequently. This paper used mathematical analysis method for solving the nonlinear differential equations based on the system equivalent diagram, and deduced the mathematical expression of the subharmonic resonance, derived the relevant affective factors of subharmonic resonance overvoltage amplitude, and analyzed the influence of all relevant...
This paper mainly study on the coordinated voltage control scheme with model predictive control (MPC). As the decomposition-coordination technology and the auxiliary problem principle is employed into the MPC based voltage control problem, a distributed voltage control model and structure can be obtained, and the global centralized optimization problem is decomposed into some sub-problems. All sub-problems...
With the continue increases in power system voltage level, more and more complex wiring has resulted in the more frequently occurrence of the subharmonic resonance. To address this issue, this paper deduces the mathematical expression of the subharmonic resonance and uses mathematical analysis method to solve the nonlinear differential equations based on the system equivalent diagram. The relevant...
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,...
An advanced method for improving the sensitivity of the digital differential protection is presented in this paper. The new approach based on adaptive adjustment of the percentage differential protection takes into account the tap position of the power transformer with on-load tap changer. The digital differential protection can be more sensitive to the faults of transformer by reducing the unbalance...
Modeling study provides a more effective and flexible way for research of high impedance fault (HIF) detection. An accurate model which can reveal most features of HIF is very important. In this paper, based on extensive investigation into documented test results, a set of most common and agreeable features of HIF has been summarized: the arc features, the non-linearity, the time-varied resistance...
This paper studies the modeling and simulation of Scott Transformer to investigate the transient behaviors of traction system. The paper presents an equivalent model of Scott Transformer, which can be used to simulate normal operation, internal fault and excitation inrush of the transformer. The model combines both the Scott Transformer and the Auto transformer, which are widely used in AT power supply...
The principles of the equivalent circuit principle and the magnetic property theory are not affected by the inrush current and over-excitation, which enable protection to act rapidly and reliably and implement ideas different from differential protection. However, the leakage inductance and resistance of each winding are required as priori parameters. At present, there is no accurate measurement method...
The study of various stability-control methods for a transmission system indicates that the reclosing time of a transmission line has a distinct influence on system stability. And there is an optimal reclosing time (ORT) for all transmission line faults. Utilizing the transient energy function (TEF) with classical models considered, the ORT setting computation method is proposed. This paper shows...
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