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For grid-connected renewable energy equipment, asymmetrical high voltage swell threatens the grid-side converter (GSC) and the dc-link capacitor. Asymmetrical high voltage swell may cause significant fluctuations across the dc-link voltage, and energy reflux of the GSC, even result in the runaway of the GSC. To cope with this situation, the control strategy of the GSC has to be improved. Firstly,...
That using of the simplest normal form theory, derives the second-order simplest normal form of the power system original differential equation model at the saddle-node bifurcation point, by transforming the higher order solves the problem of resonance coefficient singular, Analysis the system instable phenomenon that is caused by saddle-node bifurcation in use of approximate analytical solution of...
This paper implements and compares four speed identification schemes for Permanent Magnetic Synchronous Generator (PMSG) based direct driven Wind Energy Conversion System (WECS). The application issues and the performance of different schemes are discussed in details. The identification accuracy, algorithm complexity and parameter dependency of those schemes are compared by simulation and experimental...
With the rapid growth of web services, web services discovery becomes exceedingly important and challenging. Currently, many discovery approaches have been proposed such as keyword-based or VSM-based syntactic matching and ontology-based semantic matching. Syntactic matching approaches are clearly insufficient due to absence of semantic information. Although ontology-based semantic matching approaches...
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