scholarly journals Off-line PWM control with a three phases relaxed symmetry applied to a two-level inverter

Author(s):  
Bourgeade Adrien ◽  
Malek Ghanes ◽  
Fadel Maurice ◽  
Bouarfa Abdelkader ◽  
Barbot Jean-Pierre
Keyword(s):  
2015 ◽  
Vol 74 ◽  
pp. 1061-1070 ◽  
Author(s):  
K. Hemici ◽  
A. Zegaoui ◽  
A. Aissa Bokhtache ◽  
M.O. Mahmoudi ◽  
M. Aillerie

1988 ◽  
Vol 15 (1) ◽  
pp. 23-51 ◽  
Author(s):  
R McCullagh ◽  
M Andrews ◽  
Anne Clarke ◽  
G Collins ◽  
E Halpin ◽  
...  

Summary Excavations at Newton have revealed three phases of land use. Mesolithic activity was restricted to small flint working and domestic sites. A Neolithic phase appears to relate to a fragile soil resource which rapidly declined in quality. The final phase, possibly related to a Christian Irish presence on the island, occurs late in the sequence.


2015 ◽  
Vol 32 (1) ◽  
pp. 40-77
Author(s):  
Peter Mercer-Taylor

The notion that there might be autobiographical, or personally confessional, registers at work in Mendelssohn’s 1846 Elijah has long been established, with three interpretive approaches prevailing: the first, famously advanced by Prince Albert, compares Mendelssohn’s own artistic achievements with Elijah’s prophetic ones; the second, in Eric Werner’s dramatic formulation, discerns in the aria “It is enough” a confession of Mendelssohn’s own “weakening will to live”; the third portrays Elijah as a testimonial on Mendelssohn’s relationship to the Judaism of his birth and/or to the Christianity of his youth and adulthood. This article explores a fourth, essentially untested, interpretive approach: the possibility that Mendelssohn crafts from Elijah’s story a heartfelt affirmation of domesticity, an expression of his growing fascination with retiring to a quiet existence in the bosom of his family. The argument unfolds in three phases. In the first, the focus is on that climactic passage in Elijah’s Second Part in which God is revealed to the prophet in the “still small voice.” The turn from divine absence to divine presence is articulated through two clear and powerful recollections of music that Elijah had sung in the oratorio’s First Part, a move that has the potential to reconfigure our evaluation of his role in the public and private spheres in those earlier passages. The second phase turns to Elijah’s own brief sojourn into the domestic realm, the widow’s scene, paying particular attention to the motivations that may have underlain the substantial revisions to the scene that took place between the Birmingham premiere and the London premiere the following year. The final phase explores the possibility that the widow and her son, the “surrogate family” in the oratorio, do not disappear after the widow’s scene, but linger on as “para-characters” with crucial roles in the unfolding drama.


2015 ◽  
Vol 9 (1) ◽  
pp. 553-559
Author(s):  
HU Xin-xin ◽  
Chen Chun-lan

In order to optimize the electric energy quality of HVDC access point, a modular multilevel selective harmonic elimination pulse-width modulation (MSHE-PWM) method is proposed. On the basis of keeping the minimum action frequency of the power device, MSHE-PWM method can meet the requirement for accurately eliminating low-order harmonics in the output PWM waveform. Firstly, establish the basic mathematical model of MMC topology and point out the voltage balance control principle of single modules; then, analyze offline gaining principle and realization way of MSHEPWM switching angle; finally, verify MSHE-PWM control performance on the basis of MMC reactive power compensation experimental prototype. The experimental result shows that the proposed MSHE-PWM method can meet such performance indexes as low switching frequency and no lower-order harmonics, and has verified the feasibility and effectiveness thereof for optimizing the electric energy quality of HVDC access point.


Author(s):  
Michael P. DeJonge

With this chapter, the book transitions from a presentation of Bonhoeffer’s political thinking to an account of his resistance thinking in action. This chapter also begins the presentation of the first of the three phases of resistance, which lasts from 1932 until 1935. The chapter focuses on “The Church and the Jewish Question” (1933), the central text of this first phase, identifying in it the first two of Bonhoeffer’s six types of resistance: individual and humanitarian resistance to state injustice (type 1) and the church’s resistance through diaconal service to the victims of state injustice (type 2). These set the stage for Chapters 6–8’s considerations of resistance through the church’s preaching office, which is the central agent of resistance in the first phase.


Author(s):  
Michael P. DeJonge

The Introduction begins by noting the frequency and ease with which Bonhoeffer is mentioned in contemporary conversations about political resistance. Nonetheless, it would be difficult to derive from these appeals to Bonhoeffer any clear sense of the legacy of his political resistance. This raises the question: What did Bonhoeffer actually say about political resistance? Noting that Bonhoeffer spoke about political life primarily as a Christian pastor and Lutheran theologian, the Introduction sets forth the task of the book, which is a presentation of Bonhoeffer’s resistance thinking in the broader context of his theology. As summarized in the Introduction, this book presents Bonhoeffer’s resistance thinking chronologically according to three phases of development and systematically according to a sixfold typology of resistance.


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