Using ambient excited data under PMU measurements to identify the low frequency oscillation mode and oscillation modes parameter information corresponding, has good prospects in power system analysis and control. This article discusses the applicability by using the natural excitation technique (NExT) in conjunction with the eigensystem realization algorithm for low frequency oscillation modes ...

Electric field induced by charge oscillation has been investigated by simulation of the electric field distribution using the finite-difference frequency-domain method. In addition, the electric field was induced by spatial oscillation of a sample to which a DC voltage was applied. The simulation and evaluation of the electric field verified that the efficiency for inducing the electric field h...

A physiological membrane-receptor agonist typically stimulates oscillations, of varying frequencies, in cytosolic Ca2+ concentration ([Ca2+]i). Whether and how [Ca2+]i oscillation frequency regulates agonist-stimulated downstream events, such as gene expression, in non-excitable cells remain unknown. By precisely manipulating [Ca2+]i oscillation frequency in histamine-stimulated vascular endoth...

The analysis of low-frequency noise in solar cells is a very useful tool for defect characterization or understanding fluctuation mechanisms photodiodes. This type can however be limited by the presence an undesired peak frequency spectra, caused oscillation measured current. It shown this work that phenomenon originates interaction between measurement system and test structures cells, which us...

The low-frequency oscillation (LFO) problem of photovoltaic (PV) grid-connected systems has been a critical concern for safe operation, whereas the impact dc-side components PV plants are always ignored and single-stage plant is used. This paper performs comprehensive analysis LFOs in two-stage system. complete small-signal model system built. On this basis, LFO modes high-frequency (HFO) calcu...

Abstract The low frequency pressure oscillation in an aeroacoustic wind-tunnel seriously affects the flow quality and acoustic measurement. At present, there are many measures to suppress oscillation, but due lack of in-depth understanding its generation mechanism, these methods not general significance. In this paper, based on open-source software OpenFOAM, SA-DDES method is used for unsteady ...

This paper proposes a high frequency ring oscillator with low power consumption. The proposed ring oscillator is based on Gated Ring Oscillator (GRO) by applying boot strap technique. Simulation results indicate that the FoM (Power Consumption /Oscillation Frequency) of the proposed ring oscillator is greater than that of the conventional ring oscillator. Figure 1 shows delay element using boot...