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2018 | OriginalPaper | Buchkapitel

7. Rectifier

verfasst von : Jan A Melkebeek

Erschienen in: Electrical Machines and Drives

Verlag: Springer International Publishing

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Abstract

This chapter mainly discusses the classical rectifier. Starting from the diode rectifier, next the controlled rectifier is treated (both mainly for inductive loads). A section also is devoted to operation on capacitive loads. Much attention is paid to reactive power requirements and to harmonics in the grid (and load as well).

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Fußnoten
1
This infinite short-circuit current only flows during an infinitely short interval; in reality the DC inductance is finite and the short-circuit current is also finite and flows during a finite time interval.
 
2
What would be a suitable connection for the multiphase transformer?
 
3
Calculate from Fourier analysis the mean DC voltage and harmonic content for this two-phase rectifier. Do this directly, without using Eq. 7.3; because of the mid-tapped transformer, m \(=\) 2.
 
4
For a bridge rectifier a transformer between grid and rectifier is not strictly required, however.
 
5
Explain why p determines the harmonics, referring to Eq. 7.2.
 
6
As an exercise, prove that for a three-phase bridge \(V_{do}=(3/\pi )\hat{V}_{l}\) (with \(\hat{V}_{l}\) the secondary line-to-line voltage). Calculate the line current for the three-phase bridge from Eq. 7.5 and verify whether power is indeed preserved.
 
7
Nevertheless, the current must remain positive; what does this imply? (see also below).
 
8
Why not?
 
9
Draw the complete locus for the complex power in that case: how do the circles (b) and (c) transform if the delay angles are limited to \(5\pi /6\).
 
Metadaten
Titel
Rectifier
verfasst von
Jan A Melkebeek
Copyright-Jahr
2018
DOI
https://doi.org/10.1007/978-3-319-72730-1_7