1.2. 2.1. 2.2. 2.3. 2.4. 2.5. To obtain the output waveforms of a three-phase full wave full-controlled rectifier for different firing angles. To analyse the output waveforms and determine output values for different firing angles. Answer the following questions: a) What is a three-phase controlled rectifier? b) What are the advantages of three-phase controlled rectifier over three-phase uncontrolled rectifier? c) What are the effects of source inductance in the controlled rectifiers? In PSIM, build a three phase fully controlled rectifier circuit as shown in Figure 1, where Vs = 460 V at 50 Hz, Ls = 1 mH, and Id = 10 A. $15 Figure 1: Three phase fully controlled rectifier List the conditions needed for a thyristor to start conducting. What are the conditions for it to stop conducting? Draw and analyze the following waveforms in separate windows for a = 30 and a = 120 using the circuit built in 2.2: a) Supply voltage (vs), b) Supply Current (is), c) Voltages (Vpn) and (VNn) d) Output voltage across the load (va), Calculate the AC power passing through the rectifier when the firing angle, a = 30. [3] [5] [3] [7] [4] 6666 [6] [6] [6] [6] [4]