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There is an increasing demand for more detailed and accurate modeling techniques for predicting transient response of power systems caused in particular by high impedance arcing faults (HIF). This is particularly so in relation to the design and development of improved equipment and new protection techniques. Accurate prediction of fault transients requires detailed and comprehensive representation...
This paper analyzes the influence of the photovoltaic (PV) inverter on photovoltaic simulator based on the small signal model for the purpose of improving the performance of the photovoltaic simulator. Since the photovoltaic simulator works cascading photovoltaic inverter, the input impedance of the inverter could change the characteristic of the simulator. Hence, some special requirements should...
In order to research the influence of the transport demand distribution on the transport capacity. This paper predicts the transport demand by introducing the gravity model, and explains how the impedance of distance affect the transport capacity. Our numerical study indicates that the distance distribution between vertices with transport demand follows exponential decay, furthermore the distribution...
A desired islanding detection method applied in microgrid not only can detect islanding correctly within acceptable duration as same as that in distributed generation system, but also ensures the smooth transition from grid-connected mode to islanded mode. In the paper an islanding detection method is presented, which considers the characteristics of system equivalent impedance that varies with the...
This paper proposes a novel transmission line protection scheme based on frequency-domain model identification method with distributed parameter. Integrated impedance is defined by voltages and currents of two end terminals of transmission line. By analyzing the frequency-domain expressions of integrated impedance in internal and external fault states, the amplitude-frequency characteristics of the...
Eddy current testing is an important and widely used method in non-destructive testing and evaluation. In this paper, an impedance analysis model of eddy current testing based on mutual inductance equivalent circuit is established using transmission line theory, and an analytical expression of impedance of the testing workpiece is obtained. Then the changes of impedance plane of ECT sensor affected...
Basing on the distributed circuit theory, a simple and convenient method for power distribution planes (PDP) impedance calculation has been proposed, which can be utilized for power impedance analysis and capacitor decoupling design of PCB. Firstly, the power distribution plane is meshed non-uniformly and then the circuit netlist is automatically generated using MATLAB script. Secondly, the SPICE...
In Microgrids, the traditional droop characteristic may result in control errers, because of the output impedance and line impedance. In this paper, the active and reactive circulating current of the parallel system model and the traditional droop characteristic are analyzed. Considering of the output impedance and line impedance, the reactive power sharing improperly is analyzed. Because of the improper...
Lithium-ion battery impedance measurement using high-precision measuring instruments we have done, which spend much time on testing and cost high on equipments. In this paper, the studying on the lithium-ion battery, we analysis that the parameters of battery impedance model has a relation with the performance and state of battery, propose a simple detection method of internal resistance and ohm internal...
Current mode (CM) scheme provides suitable alternative for the high speed on-chip interconnect signaling. This paper presents a energy-delay optimization methodology for the current-mode (CM) signaling scheme. Optimization for the CM circuits for on-chip interconnects requires a joint optimization of driver and receiver device sizes, as their parameters which affect the energy-delay performance depend...
Microstrip Antennas (MSAs) consist of a metallic radiating patch on one side of thin dielectric substrate and other side is ground plane. Most important advantages of MSAs are low profile, light weight and compatibility with integrated circuit technology. MSAs are used in mobile communication, satellite communication, radar, direct broadcasting, global positioning systems and remote sensing. The major...
The major limitations of microstrip antennas (MSAs) are their narrow impedance bandwidth, small gain and low power handling capability. A half U-slot MSA with shorting wall has been designed and experimentally verified. Its center frequency is observed at 2.66 GHz. The bandwidth is 688 MHz and percentage bandwidth is 25.6% has been obtained while radiation efficiency is above 94% for the operating...
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