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The problem of model reduction by moment matching for multimachine power systems is addressed and solved using the recently introduced notion of moment for nonlinear systems. It is shown that the reduced order model can be used to construct asymptotic estimates for the unmeasured states. The theory is illustrated by means of simulation on a 2-machine power system.
In the actual operation of distribution grid with DG, the traditional islanding proection methods do not consider the requirement of low voltage ride through (LVRT) and the cooperation of recloser control. Therefore, the paper proposes a novel islanding protection scheme. Using the position information of the related circuit breakers and the electrical information of PCC of DG, a new islanding detection...
In this paper, a accuracy large-signal model based on agilentHBT model for InP dou-ble heterojunction bipolar transistors (DHBTs) is implemented as symbolically defined device (SDD) in Agilent ADS. The model accounts for most physical phenomena including the Kirk effect, soft knee effect, base collector capacitance and collector transit time. The validity and the accuracy of the large-signal model...
After the fourth passive circuit element (Memristor) came to existence in 2008 its tremendous potential to be used as a replacement for MOSFETS made its mathematical modeling very imperative. Various device models for the memristor had been proposed earlier such as the linear ion drift model, non linear ion drift model, tunnel barrier model, and a recently proposed TEAM model. In case of linear ion...
Power-hardware-in-the-loop (PHIL) simulation technique allows part of the simulation circuit to be realized using a physical hardware. It has a real-time software component and a hardware component which work like one unit. A power amplifier is one of the most fundamental interface blocks in a PHIL simulation. It converts a low power signals received from the software simulator to a high power signal...
The ever-increasing clock speeds of printed circuit board (PCB) have imposed many challenges on the circuit designers, one of which is to pass the electromagnetic compatibility compliance testing for radiated emissions. It is essential to predict PCB radiated emissions prior to a compliance test with the aim to save cost and time. For high-speed PCBs, their traces are electrically long and thus making...
This paper presents an investigative work about the application of State Space Model-Based Predictive Control in a three-phase Permanent Magnet Synchronous Motor with trapezoidal back-electromotive force, for speed control. Such motor is utilized in the white goods appliances industry and also in automotive and medical applications, among others, especially due to its high effiency and long life cycle...
This paper demonstrates some fundamentals concerning the study of the Fractional order Transmission Line (FTL) operation. A numerical algorithm applied to study the transient analysis is shown describing the abnormal diffusion that appears in the operation of the TL. According to the steady state analysis of the FTL operation, the superior advantages over the conventional domain of imposing the fractional...
Oceanic energies and Oceanic wave energy in particular is one of the most reliable sources of renewable. There has been several methods introduced regarding harnessing this type of energy and as a consequence there are various mechanisms designed, each aims to convert the energy of the Oceanic wave to a useful type of energy. The gap found in the literature survey is that the current mechanisms do...
Mem-element based synaptic bridge is very promising topic due to its learning capability where the synaptic bridge can be build using either memristors or memcapacitors. In this paper, the detailed mathematical analysis of memcapacitor bridge circuit is introduced. This mathematical analysis is build when a current input signal is applied to excite the bridge. Closed form expressions for the required...
Even though the power systems for the last century have been running on ac, with the emerging dc technologies such as solar photovoltaic (PV), LED lights, electric vehicles (EVs) and so on the interest for dc networks are also increasing. Rather than the traditional practice of inverting the dc power output of PVs to ac, it would be efficient if the dc power is used without inverting. With the development...
Day to day rising power demand makes our present technology lean towards non-conventional resources like solar energy. In this paper, it is focused on optimization of solar energy in PV module by servo mechanical tracking system at variable irradiation and temperature conditions. Here the particular time of day and location of PV module is also considered. Focus has been given to make better use of...
In this paper, we propose to study the inversion of multivariable linear time varying systems modelled by bond-graph approach. Thus, an analysis method based on non-commutative differential algebra concepts is presented. The inverse and the reduced inverse models are studied in function of the decouplability of multivariable LTV system. To show the interest of this new method, several applications...
Modeling and analysis of low frequency noise in circuit simulators with time-varying bias conditions is a long-standing open problem. In this paper, we offer a definite solution for this problem and present a model for low-frequency noise that captures the internal, stochastic dynamics of the individual noise sources via dedicated internal pseudo nodes that are coupled with the rest of the circuit...
This paper proposes a new modeling method for buck converter. The new modeling method, named bi-switching status method (BSM), for buck converter is obtained via the propositional calculus and linear constrain. Based on the mixed logical dynamical (MLD) model, BSM model of buck converter is obtained. Compared with other modeling methods, such as MLD method and state-space averaging method, streamlined...
A fuel cell is usually a low-voltage with hybrid voltage/current source characteristics. So that their output voltage must be increased to approximately a few hundred volts to be suitable for vehicles power trains or for any industrial application. Therefore a dc-dc power converter is required to set up the fuel cell voltage to high voltage DC bus. In this paper, analysis, implementation and control...
A new hysteretic control strategy with output capacitor equivalent series resistance (ESR) ripple compensation is presented. With such compensation, the effect of output capacitor ESR ripple voltage is enhanced. When step load change occurs, feedback of the output ripple adjusts the duty ratio promptly. In result, the proposed control scheme gains faster transient response speed and better steady...
In this study, we investigate synchronization phenomena in coupled polygonal oscillatory networks with strong frustrations. We focus on the amplitude of each oscillator when the coupling strength is increased. By using the computer simulations, we confirm that the amplitude of the oscillators decreases by increasing the coupling strength and oscillation death frustrated oscillators is occurred. Furthermore,...
With increasing error-proneness of nano-circuits, a number of fault-tolerance approaches are presented in the literature to enhance circuit reliability. The evaluation of the effectiveness of fault-tolerant circuit structures remains a challenge. An analytical model is required to provide exact figures of reliability of a circuit design, to be able to locate error-sensitive parts of the circuit as...
Triple-layer piezoelectric composite cantilevers possess good electromechanical conversion behavior with characteristics suitable for diverse applications, especially at low frequency. Thus, the use of such cantilevers has been extensively attempted in fabricating piezoelectric devices. This study reports on the accurate determination methods for the equivalent circuit parameters derived from the...
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