GATE EE 2016 Set 2 — Question 55
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Power Electronics → AC-DC Converters → Semi & Full Converters (1φ)
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Question
A full-bridge converter supplying an RLE load is shown in figure. The firing angle of the bridge converter is 120º. The supply voltage V, R=20 , E=800 V. The inductor L is large enough to make the output current a smooth dc current. Switches are lossless. The real power fed back to the source, in kW, is __________.
Correct answer
5.9 to 6.1
Solution
1.Calculate the average output voltage of the converter ():
For a single-phase full-bridge converter:Given and :
V.
2.Determine the average load current ():
The load equation for the RLE circuit is:(where is the back EMF aiding or opposing based on polarity).
From the diagram, the battery is connected such that its positive terminal is at the bottom relative to the bridge output. Thus, V.
A.
3.Calculate the power fed back to the source ():
Power delivered by the converter is W.The negative sign indicates that power is being fed back from the load to the AC source.
Power fed back = W = kW.The real power fed back to the source is 6 kW.
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