29.06.2013 Aufrufe

Wechselrichter mit eingeprägter Spannung (U–Wechselrichter)

Wechselrichter mit eingeprägter Spannung (U–Wechselrichter)

Wechselrichter mit eingeprägter Spannung (U–Wechselrichter)

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<strong>Wechselrichter</strong> <strong>mit</strong> <strong>eingeprägter</strong> <strong>Spannung</strong> (U–Wechserichter) 1<br />

<strong>Wechselrichter</strong> <strong>mit</strong> <strong>eingeprägter</strong> <strong>Spannung</strong><br />

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(U–<strong>Wechselrichter</strong>)<br />

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¢<br />

£ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ £ <br />

¤ £ ¤ £ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ £ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¤ ¥<br />

¤ ¤ ¤<br />

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Zeichnen Sie für den gegebenen U–<strong>Wechselrichter</strong> (Zweipunkt–<strong>Wechselrichter</strong>) <strong>mit</strong> symmetrischer<br />

dreiphasiger Last und sinusförmigen Lastströmen die Zeitverläufe der folgenden Größen<br />

für Dreieck–Sinus–Modulation:<br />

– die Ausgangsspannungen ua0, ub0, uc0 (bezogen auf den Mittelpunkt 0),<br />

– die verkettete <strong>Spannung</strong> uab,<br />

– die Lastspannung ua (bezogen auf den Mittelpunkt M der Last),<br />

– die <strong>Spannung</strong> uM0 (zwischen den Mittelpunkten M und 0),<br />

– den Zwischenkreisstrom id<br />

für die folgenden vier Betriebsfälle:<br />

a) Grundfrequenztaktung, Laststrom in Phase (ϕ1 = 0),<br />

b) Grundfrequenztaktung, Laststrom um ϕ1 = 90 ◦ nacheilend,<br />

c) Dreifachtaktung, Zwischenpulsweite 2α = 30 ◦ , ϕ1 = 0,<br />

d) Dreifachtaktung, Zwischenpulsweite 2α = 60 ◦ , ϕ1 = 0.<br />

Er<strong>mit</strong>teln Sie jeweils den Mittelwert des Zwischenkreisstroms Id , die vom Zwischenkreis abgegebene<br />

Wirkleistung Pd sowie die von der Last aufgenommene Wirkleistung PL (Verluste<br />

vernachlässigt).<br />

Leistungselektronik SS 2000 8. Übung<br />

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<strong>Wechselrichter</strong> <strong>mit</strong> <strong>eingeprägter</strong> <strong>Spannung</strong> (U–Wechserichter) 2<br />

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Leistungselektronik SS 2000 8. Übung


<strong>Wechselrichter</strong> <strong>mit</strong> <strong>eingeprägter</strong> <strong>Spannung</strong> (U–Wechserichter) 3<br />

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Leistungselektronik SS 2000 8. Übung


<strong>Wechselrichter</strong> <strong>mit</strong> <strong>eingeprägter</strong> <strong>Spannung</strong> (U–Wechserichter) 4<br />

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Leistungselektronik SS 2000 8. Übung


<strong>Wechselrichter</strong> <strong>mit</strong> <strong>eingeprägter</strong> <strong>Spannung</strong> (U–Wechserichter) 5<br />

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Leistungselektronik SS 2000 8. Übung

Hurra! Ihre Datei wurde hochgeladen und ist bereit für die Veröffentlichung.

Erfolgreich gespeichert!

Leider ist etwas schief gelaufen!