The relationship between the calculated charged-particle densities in positive corona, the rate of streamer production, and the photon count from the corona were investigated and found to be closely related. Both the densities of electrons and positive ions peaked at 11.8 kV, near the corona inception voltage; they then fell rapidly before slowly rising again. This behavior was exactly matched by the measured photon count. The calculation of the charged-particle density in a positive corona was achieved by means of a fluid model.

The power system small signal stability analysis considering wind generation intermittence is studied comprehensively in this paper. The modelling of doubly‐fed induction generator (DFIG) involving the converters with application of stator flux‐oriented vector control strategy is addressed briefly. In order to reveal how the intermittent nature of wind power affects the operating behaviour of an existing power system, a probabilistic small signal stability analysis method based on Monte Carlo simulation technique is proposed to explore and exploit the impact of intermittent grid‐connected wind power on small signal stability. The IEEE New England test system is applied as benchmark to verify the proposed model and approach. Total 3 scenarios are elaborately designed to figure out the potential relationship between the small signal stability indices and the wind generation intermittence. Finally, some preliminary conclusions and comments were drawn based on the numerical simulation results. Copyright © 2010 John Wiley & Sons, Ltd.

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Accurate and rapid prediction of dielectric constant (ε) for polymer-based dielectrics at various frequencies remains challenging. We construct a dataset of dielectrics with an easily attainable numerical representation scheme. We propose an interval support vector regression with a particle swarm optimization to accelerate the ε prediction, discovery, and design of polymer dielectrics at various frequencies (spanning from 100 Hz to 1015 Hz). The key features affecting dielectric constant could be identified, and this is highly valuable to target the discovering of polymer dielectrics as high-throughput screening and tailor the desirable property.