The interaction between the voltage source converter (VSC) and weak grid causes a negatively damped or diverging oscillation (DVO). generally evolves into sustained (STO) when governed by nonlinearities in VSC's control system, such as saturation of pulse width modulation (PWM). conventional small-signal impedance/admittance modelling (SSIM/SSAM) stability analysis methods are not suitable for ...

This paper presents the characterization of illuminated high-frequency active devices using a time domain physical simulation model. The model is based on Boltztnann’s Transport Equation (BTE), which accurately accounts for carrier transport in microwave and millimeter wave devices with sub-micrometer gate lengths. Illumination effects are accommodated in the model to represent camer density ch...

We examine the perturbations of the modes of an acoustic thermometer caused by circular ducts used either for gas flow or as acoustic waveguides coupled to remote transducers. We calculate the acoustic admittance of circular ducts using a model based on transmission line theory. The admittance is used to calculate the perturbations to the resonance frequencies and half-widths of the modes of sp...

The characteristics of high frequency (1000 Hz) acoustic admittance results obtained from normal neonates were described in this study. Participants were 170 healthy neonates (96 boys and 74 girls) aged between 1 and 6 days (mean = 3.26 days, SD = 0.92). Transient evoked otoacoustic emissions (TEOAEs), and 226 Hz and 1000 Hz probe tone tympanograms were obtained from the participants using a Ma...

A multimodal method based on a generalization of the admittance matrix is used to analyze wave propagation in heterogeneous two-dimensional anisotropic media. The heterogeneity of the medium can be due to the presence of anisotropic inclusions with arbitrary shapes, to a succession of anisotropic media with complex interfaces between them, or both. Using a modal expansion of the wave field, the...

Comprehensive unified power flow controller ( UPFC ) technology can calculate voltage control parameters of UPFC, but it increases the nonlinearity Newton calculation. When comprehensive is combined with intelligent algorithm, only be optimized through active and reactive on branch, which makes optimization convergence worse. Therefore, an optimal calculation method for distribution network bas...

Electrochemical microelectrodes are commonly used to record amperometric spikes of current that result from oxidation of transmitter released from individual vesicles during exocytosis. Whereas the exquisite sensitivity of these measurements is well appreciated, a better understanding of the noise sources that limit the resolution of the technique is needed to guide the design of next-generatio...