Experimental and mathematical studies in immunology have revealed that the dynamics of the programmed T cell response to vigorous infection can be conveniently modelled using a sigmoidal or a discontinuous immune response function. This paper hypothesizes strong synergies between this existing work and the dynamical behaviour of engineering systems with a variable structure control (VSC) law. T...

This paper proposes a hybrid discontinuous control methodology for a voltage source converter (VSC), which is used in an uninterrupted power supply (UPS) application. The UPS controls the voltage at the point of common coupling (PCC). An LC filter is connected at the output of the VSC to bypass switching harmonics. With the help of both filter inductor current and filter capacitor voltage contr...

This paper presents performance evaluation of an asymmetrical parameter type two-phase induction machine drive using two-phase three-leg voltage source converter (VSC) operating in motoring and generating modes. A system is simulated using MATLAB/SIMULINK. The proposed converter system includes a machine side converter using a three-leg VSC and a front end converter using a single-phase full br...

Voltage source converter based high-voltage direct current (VSC-HVDC) transmission technology has been extensively employed in power systems with a high penetration of renewable energy resources. However, connecting voltage (VSC) to an AC weak grid may cause the system become unstable. In this paper, phase-shift phase-locked loop (PS-PLL) is proposed wherein back electromotive force (BEMF) obse...

This paper presents an integrated methodology applied to photovoltaic (PV) plants for improving the dynamic performance of electric power systems. The proposed is based on primary frequency control, which adds ancillary signal voltage reference DC-link source converter (VSC) in order reduce oscillations. computed by relating energy stored VSC and synchronous machine’s shaft. In addition, consid...

Abstract This paper proposes a switched-capacitor voltage buck converter (SC-VBC) with variable step-down controller (VSC) and switching frequency (SFC). The VSC SFC change the ratio of SC-VBC in accordance input load current, respectively, enabling to operate efficiently wide-ranging current. Measurements prototype chip demonstrated that our achieved wide range high efficiency 1.3–2.6 V 69%, r...

Abstract As the use of renewable resources increases transfer power from remote area to consumer is a big challenge. Therefore, Voltage Source Converter High Direct Current (VSC-HVDC) transmission gaining more popularity for integration energy generators consumers using smart grid. Even after many advantages HVDC system it not used popularly due unexpected instability in system. However recent ...

In order to solve the problem that voltage source converter based multi-terminal direct current (VSC-MTDC) system cannot provide inertia and participate in frequency modulation after connecting AC power grid under traditional control strategy, an adaptive strategy on virtual is proposed. First, relationship between DC was established by a control, allowing VSC-MTDC side. Second, address limited...

<p>Planning of high voltage direct current (HVDC) grids requires inclusion reliability assessment alternatives under study. This paper proposes a methodology to evaluate the adequacy source converter/VSC-HVDC networks. The analyses performance system using N-1 and N-2 contingencies in order detect weaknesses DC network evaluates two types remedial actions keep entire acceptable operating ...

Adipose tissue-derived stem cells (ADSC) are routinely isolated from the stromal vascular fraction (SVF) of homogenized adipose tissue. Similar to other types of mesenchymal stem cells (MSC), ADSC remain difficult to define due to the lack of definitive cellular markers. Still, many types of MSC, including ADSC, have been shown to reside in a perivascular location, and increasing evidence shows...