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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...
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...
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...
Self-adaptive system islanding refers to the separation of an interconnected power system into electrically isolated islands automatically based on the identification of unstable mode. A fast searching algorithm for self-adaptive power system islanding, which is called multilevel reduced graph partitioning (MLRGP) algorithm, is presented in this paper. The aim of this algorithm is that the generation...
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...
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