GATE EE 2017 Set 1 — Question 25
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Power Electronics → Inverters → 180° & 120° Conduction
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Question
A 3-phase voltage source inverter is supplied from a 600V DC source as shown in the figure below. For a star connected resistive load of per phase, the load power for device conduction, in kW, is ________.
Correct answer
8.5 to 9.5
Solution
In conduction mode of a 3-phase voltage source inverter (VSI) with a star-connected resistive load:
V
per phaseCalculation:Converting to kW:The load power is 9 kW.
1.Each switch conducts for in a cycle.
2.At any given instant, exactly two switches are ON (one from the upper group and one from the lower group).
3.This means two phases of the star-connected load are connected in series across the DC source , while the third phase is open-circuited.
4.The equivalent resistance across the DC source is .
5.The instantaneous power delivered to the load is .
6.Since this power is constant for all six intervals in a cycle, the average power is also .
Given:V
per phaseCalculation:Converting to kW:The load power is 9 kW.
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