Summary This paper presents experimental results on a grid‐connected inverter. The control of the inverter is based virtual synchronous generator model algebraic type. When using type, there no evidence for satisfactory operation with unbalanced load and nonlinear load, because models are constructed under assumption that linear balanced. By choosing feedback loop gain appropriately, achieved even if an connected. Experimental show power controls, active reactive, preferably in...

Abstract Calculation methods for the single-stage permeation of a multicomponent gas mixture are presented five flow patterns: cocurrent flow, countercurrent cross perfect mixing, and one-side mixing. The derivations cast in form suitable computer calculation. calculation appropriate systems with any number components. results shown separations NH3, H2, N2 gaseous by means polyethylene membrane, CH4, CO, N2, CO2 through microporous glass membrane.

This paper presents an algorithm for the solution of optimal control problems with constraints on control, but without trajectory or terminal state. In this algorithm, reduction a cost at each iteration is guaranteed. Global convergence conditions are investigated and example worked out.

A diffusion equation for gas permeation through microporous media in the Knudsen regime was obtained theoretically, considering potential energy between a molecule and solid surface of pores. The as function temperature contains four parameters, all which have physical meanings. most significant these parameters is effective ε*, by characterized. Permeabilities He, H2, CO, N2, O2, Ar, CO2 Vycor glass membrane were measured range from 300 K to 950 K. validity verified experimentally shown...

A novel model order reduction method for efficient analysis of linear eddy-current problems is proposed in which the quasi-static electromagnetic fields are expressed by a weighted sum sequence static electric- and magnetic-field modes. The modes calculated sequentially electric magnetic computations using conventional finite-element method, time-dependent weights voltages currents an equivalent Cauer ladder network problem. In this paper, formulation numerical test problem presented,...

A membrane reactor, which is a double-tubular reactor equipped with selective tube as the inner tube, was proposed. Such makes it possible to obtain product yield of reversible reaction beyond its equilibrium value by continuous removal products during reaction. microporous glass employed membrane, through gases permeate almost according Knudsen''s law. Experiments in dehydrogenation cyclohexane benzene model were carried out, using under atmospheric pressure range 453-493 K. It shown...

This paper presents the experimental results of a grid connected inverter. The control inverter is based on virtual synchronous generator model algebraic type. In case using type, there no evidence for satisfactory operation with unbalanced load and nonlinear load, because are constructed under assumption that linear balanced. By choosing feedback loop gain appropriately, achieved even if connected. Experimental show power controls, active reactive, preferably in connecting mode. Smooth...

Abstract This article proposes a mechanism of CO 2 hydrate formation taking into account both diffusion and reaction, gives an analysis its kinetics. The most important assumptions on the model are that water dissolves liquid reacts to form hydrate, blocks dissolution water. Computational simulations were conducted, proposed explains well many observations in previous articles. It is concluded disposed deep ocean will very thin film this greatly control ocean. © 1993 John Wiley & Sons, Inc.

Using the Legendre expansion of magnetic field distribution, we derive standard Cauer circuit representation frequency-dependent properties sheets and discuss its physical meaning. The non-linear inductors is derived so as to apply in dynamic hysteresis modeling silicon steel. This accurately reconstructs hysteretic property under pulsewidth modulation excitation using only one or two elements.

Simulation models of magnetic sheets are proposed. The partial fraction decomposition for trigonometric functions is used to obtain the in form Foster I and II realizations, while formulas Bessel Cauer I. It shown that convergence speed realization much faster than Foster's. implies circuit behaviors with wide frequency range can be evaluated by using small number circuits components. obtained transforming impedance given flux properly estimated models. wires also presented methods mentioned...

When distributed generators are connected to the grid, it is required that system withstand voltage dip caused by grid failure. This known as low ride through (LVRT). One of effective choices realize LVRT a inverter with virtual synchronous generator (VSG). paper present VSG control capability for LVRT. By using this control, operation can be continued even if severe at has happened.

Several virtual synchronous generator (VSG) controls for three-phase inverters have been proposed in order to extend the advantages of generators inverters. The VSG facilitate smooth transitions between grid-connected mode and island mode. governor automatic voltage regulator (AVR) realized stabilize frequency respectively In addition, they can control active reactive power inverter objective this paper is these useful properties single-phase with a based on two d-q reference frames, i.e.,...

ABSTRACT This paper studies the fracture behaviour of cracked carbon nanotube (CNT)‐based polymer composites by a combined numerical–experimental approach. Tensile tests were conducted on single‐edge plate specimens CNT/polycarbonate at room temperature and liquid nitrogen (77 K), critical loads for instabilities determined. Elastic–plastic finite element simulations then performed to evaluate J ‐integrals corresponding experimentally determined loads. Scanning electron microscopy...