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Transformer parasitics such as leakage inductance and self-capacitance are rarely calculated in advance during the design phase, because of the complexity and huge analytical error margins caused by practical winding implementation issues. Thus, choosing one transformer architecture over another for a given design is usually based on experience or a trial and error approach. This paper presents analytical...
The dual active bridge (DAB) converter is an isolated bidirectional dc-dc topology which is the most critical part for the power conversion systems such as solid-state transformers (SST). This paper focuses on analysis and design of high frequency ac inductors which are the power interfacing component in DAB converters or DAB's derivative topologies for transferring energy between the primary and...
The single-stage photovoltaic grid-connected system uses only once energy conversion to complete two functions: Maximum power point tracking (MPPT)and grid connected, so it has a large advantage of cost and efficiency. This paper research the Single Stage Three-phase Grid-connected Photovoltaic Inverter. Against the slow response of the DC bus voltage for the control of the traditional double-loop,...
Transformer parameters such as leakage inductance and self-capacitance are rarely calculated in advance during the design phase, because of the complexity and huge analytical error margins caused by practical winding implementation issues. Thus, choosing one transformer architecture over another for a given design is usually based on experience or a trial and error approach. This work presents equations...
Phase change memory (PCM) is a promising technology to solve energy and performance bottlenecks for memory and storage systems. To help understand the reliability characteristics of PCM devices, we present a simple fault model to categorize four types of PCM errors. Based on our proposed fault model, we conduct extensive experiments on real PCM devices at the memory module level. Numerical results...
In this paper an analysis of two planar transformers designed for high-current switching applications is presented. Typical converter application is represented by fuel and electrolyser cell converters. The transformer designs are based on E+I and ER+I planar cores while the analysis focuses on winding resistance and leakage inductances which represent the main concerns related to low-voltage high-current...
Based on the transient circuit model of series compensated line, a new method for identifying the fault location relative to series capacitor (SC) is proposed. Comparing the transient model of series compensated line when fault occurs before the SC and the one when fault occurs after the SC, it is found that the only difference is the value of a model-parameter: it respectively equals 0 and a large...
It was exposed to excessive drought from winter in 2009 to spring in 2010 at Southwest China. Regional sensitive evaluation system of biological invasion was built up with indexes such as ratio of invasion area, diffusing distance, spreading manner and resistance of local biological community. And then the impact of excessive drought on regional sensitivity of Eupatorium adenophorum invasion in Yunnan...
A novel wide area backup protection based on multi-agent technique for series compensated lines is proposed in this paper. The principle of conventional distance protection could be remained normally, and the operating procedure of relaying devices in adjacent substations would be coordinated by each agent within protected area. The simulation tests of practical series compensation project based on...
This paper proposes a new partition principle based on bus sequence voltage distribution characteristic for wide area protection system. The influence of short lines, multiple fault and high resistance ground faults are analyzed. Information from multiple points within wide area network is supervised by central station of protection system. Then, suspected faulty zone can be detected according to...
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