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Yongfeng Feng - IEEE Xplore Author Profile

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High short-circuit currents can cause equipment failures that conventional protective devices may not avoid. Alternatively, solid-state fault current limiters (SSFCL) are designed to limit high levels of short circuit currents, in particular, within quarter cycle. However, the SSFCL may cause sensor and protection equipment malfunction; this may lead to mis-coordination and false tripping between ...Show More
The fault current limiter (FCL) is considered as the ideal solution to limit the fault current in integrated electrical power systems with distributed energy resources because of its speed of response. However, there are some practical application issues for FCL in commercial industrial deployments. In this paper, the coordination issue of FCL with the other protective devices is discussed making ...Show More
Power Electronic Module (PEM) design requires simultaneous analysis of thermal, electrical, and mechanical parameters to design an optimal layout. The current design process being used by package designers involves a sequential procedure instead of a simultaneous process. Each design step involves the analysis of the thermal, electrical or mechanical aspects of the design. As a result, the designe...Show More
Multi-chip power module design requires simultaneous analysis of thermal, electrical, and mechanical parameters to design an optimal layout. The current design process being used by package designers involves a sequential procedure that is time-consuming and requires multiple design runs. The existing Power-CAD methodology that automates the module design process and optimizes the layout has been ...Show More
Solid-state fault current limiters (SSFCLs) offer a number of benefits when incorporated within transmission and distribution systems. SSFCLs can limit the magnitude of a fault current seen by a system using different methods, such as inserting a large impedance in the current path or controlling the voltage applied to the fault. However, these two methods can introduce a few problems when SSFCLs ...Show More
A novel algorithm for automatic behavioral model topology formulation (MTF) is described in this paper. Several new terms are defined to support this formulation approach. The algorithms for determining the controllability and equivalence of branches are developed. The identification of differential pairs and current mirror structures is implemented automatically. Some other algorithms identify a ...Show More
The growth of demand invariably lead to higher and higher fault currents, and as a consequence protection devices must have higher ratings. The integration of distributed energy resources further complicates protection schemes, especially those that assume a radial distribution scheme and power flowing in only one direction. These conditions generate an increasing demand for fault current limiters...Show More
This paper describes a new fully automated, behavioral modeling tool, Ascend, which starts from the netlist description of the circuit and generates differential algebraic equation (DAE) based behavioral models. The physical modeling methodology in Ascend makes it possible to represent the nonlinear behavior of circuits. A modeling example is given for a better illustration of the behavioral model...Show More
This paper presents a brief on the current state-of-the-art in circuit modeling techniques that abstract reduced-order, higher-level models from the circuit or transistor level. The methods are reviewed in the context of the classes of circuits for which they have been demonstrated.Show More