'Neutral line' diaporamas de présentation

Magnetic Reconnection: Recent Developments and Connections with CMSO Research

Magnetic Reconnection: Recent Developments and Connections with CMSO Research. A. Bhattacharjee, K. Germaschewski, J. Dorelli, J. Greene, C. S. Ng, S. Hu, and P. Zhu Space Science Center Institute for the Study of Earth, Oceans, and Space University of New Hampshire

657 views • 56 slides

Winter Sun

Winter Sun. ????? ??????????? ? ?????? ??????? ????????? ???????. My friend Eric. ?.?. ?????????, ?.?. ????????, ?.?. ????? ????? ?????? ??????. ISR, Febr 8 , 2009. Analytical models of magnetic reconnection

659 views • 47 slides

The Earliest Phases of Solar Eruptions

The Earliest Phases of Solar Eruptions. Alphonse C. Sterling 1 NASA/MSFC. 1 Currently at JAXA/ISAS, Sagamihara, Japan. Introduction. What happens at the start of solar eruptions? Preflare phase. Hints about the trigger mechanism?

587 views • 46 slides

On the Extrapolation of the Sun to the Heliosphere

On the Extrapolation of the Sun to the Heliosphere. R. A. Howard ACE / SOHO / STEREO / WIND Workshop 8-10 June 2010. Outline. PFSS Modeling Long-term brightness of corona Long-term mass of CMEs Use of HI-type of imaging to see solar wind context. Potential Field Source Surface. PFSS.

376 views • 28 slides

On Coronal Mass Ejections and Configurations of the Ambient Magnetic Field

431 views • 27 slides

Interaction of coronal mass ejections with large-scale structures

360 views • 20 slides

Evidence for chromospheric heating in the late phase of solar flares

301 views • 17 slides

Example : The 4-wire Y-Y system below has a balanced generator with 720 V RMS and an acb phase sequence. Determine I aA , V an , V AN , and the power loss in each line. a. A. +. +. +. j2. j3. 1. 2. 5. +. j10. -. n. N. -. -. +. +. j10. j10. b. B. +. +. +. j2. j3. 1. 2.

235 views • 12 slides

A New Hybrid Power Conditioner for Suppressing Harmonics and Neutral-Line Current in Three-Phase Four-Wire Distribution

In this paper, a new hybrid power conditioner is proposed for suppressing harmonic currents and neutral-line current in three-phase four-wire distribution power systems. The proposed hybrid power conditioner is composed of a neutral-line current attenuator and a hybrid power filter. The hybrid power filter, configured by a three-phase power converter and a three-phase tuned power filter, is utilized to filter the nonzero-sequence harmonic currents in the three-phase four-wire distribution power system. The three-phase power converter is connected to the inductors of the three-phase tuned power filter in parallel, and its power rating can thus be reduced effectively. The tuned frequency of the three-phase tuned power filter is set at the fifth harmonic frequency. The neutral- line current suppressor is connected between the power capacitors of the three-phase tuned power filter and the neutral line to suppress the neutral-line current in the three-phase four-wire distribution power system. With the major fundamental voltage of the utility dropping across the power capacitors of the three-phase tuned power filter, the power rating of the neutral-line current suppressor can thus be reduced. Hence, the proposed hybrid power conditioner can effectively reduce the power rating of passive and active elements. A hardware prototype is developed to verify the performance of the proposed hybrid power conditioner. Experimental results show that the proposed hybrid power conditioner achieves expected performance.

158 views • 11 slides