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This paper presents a transient analysis of various configurations of DC distribution systems. A combination of theoretical and practical methods were used to investigate the behavior of the system's variables after the occurrence of faults and the protection operation. A number of networks of varying complexity were built with detailed cable models using the EMTP/ATP software package in order to...
Connecting large dc distribution grids on the same voltage level can allow superior utilization of infrastructure. Selective ground fault protection is necessary and can be done using low impedance grounding. Distributed energy resources would allow for higher resilience of the grid if islanding operation of dc microgrids is allowed. For safety, grounding is essential in these islanded microgrids...
Due to low inertia and constant power loads, stability is a major issue for dc distribution grids. Previous research focuses mostly on the (mathematical) analysis of the stability, but does not provide any guidelines to ensure stability. This paper presents four guidelines that ensure the existence of an appropriate equilibrium and stability around that equilibrium. From a linearized model of the...
A mathematical model of series-parallel compensation topology for contactless power transfer system is proposed in this paper. The effect of harmonics is considered to model the system parameter. A fourier series analysis is used in mathematical modeling. An experimental set-up of series-parallel compensated contactless power transfer system is built in the laboratory to verify the proposed model...
Unplugging of energized loads in dc microgrids can cause safety concerns to users in residential areas. Sustained series arcs are more relevant in dc systems than in ac due to absence of current zero crossing. In this paper, the series arcs are detected from the load side, wherein, the proposed algorithm monitors the drop in load capacitor voltage associated with the intial electrode dependent series...
A complicating aspect in the control design of resonant inductive power transfer systems is the absence of a direct communication link between primary and (multiple) secondary system sides. This paper introduces a new adaptive sliding-mode control surface, which continuously adapts the inductive system's input power to the required, but unknown, variable load power. As a result, an indirect communication...
Smart materials used as generators have received considerable attention lately and several prototypes were built to demonstrate the process. The focus of this paper is to show how the dielectric elastomers can be used as variable capacitor generator, how the maximum energy gain can be withdrawn from the system by realizing an innovative current waveform to charge and discharge the polymer. The paper...
Dielectric elastomers used as generators have received considerable attention lately and several prototypes were built to demonstrate the process. The aim of the paper is to show how an innovative energy harvesting cycle can be realized to use the DEs as an efficient generator. It investigates the effects of (dis)charging instants, the current amplitude and how the parasitics of the material influences...
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