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 />
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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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§ § <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