A 3-phase voltage source inverter is supplied from a 600 V DC source as shown in the figure below. For a star connected resistive load of 20 Ω per pha - Electrical Engineering NAT PYQs Based test 23: Power Electronics | ExamTest.live

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A 3-phase voltage source inverter is supplied from a 600 V DC source as shown in the figure below. For a star connected resistive load of 20 Ω per phase, the load power for 120° device conduction, in kW, is ____________.

Correct Answer

8.5-9.5

Solution & Step-by-step Explanation

Concept: Parameter 180° conduction mode 120° conduction mode Phase voltage (Vph) \frac{2}{3} V_{s} \frac{V _{s}}{6} Line voltage (VL) \frac{2}{3} V_{s} \frac{V _{s}}{2} RMS load current (Ior) \frac{2}{3 R} V_{s} \frac{V _{s}}{6 R} RMS thyristor current (ITr) \frac{V _{s}}{3 R} \frac{V _{s}}{2 3 R} Calculation : Given that, V_{oc} = 600 V R_{L} = 20 Ω/ph RMS value of phase voltage (Vₚₕ) = \frac{V _{s}}{6} = 0.4082 V_{d c} Vph = 0.4082 \times 600 Vph = 244.92 V Load power = \frac{3 V _{ph}^{2}}{R} = \frac{3 \times ( 244.92 ) ^{2}}{20} = 8.99 kW

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A 3-phase voltage source inverter is supplied from a 600 V DC source as shown in the figure below. For a star connected resistive load of 20 Ω per phase, the load power for 120° device conduction, in kW, is ____________.

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