GATE EE 2020 Set 1 — Question 23
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Power Electronics → Harmonics & AC-AC Converters → AC Voltage Controllers
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Question
Thyristor is triggered at an angle (in degree), and at angle , in each cycle of the sinusoidal input voltage. Assume both thyristors to be ideal. To control the load power over the range 0 to 2 kW, the minimum range of variation in is:
Correct answer
(C) 60^ to 120^
Solution
The load impedance is . The load phase angle is . The maximum power that can be delivered to the load is W = 2 kW. This maximum power is achieved when the thyristors are triggered at . To reduce the power to zero, the triggering angle must be increased. For this specific load, the power becomes zero when . Thus, the range of to control power from 2 kW to 0 is to .
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