1) In a single phase half controlled bridge rectifier circuit shown in figure 3. Vp=240V at 50Hz, and Id=10A.. Neglect voltage drop in thyristors. Thyristors Specifications (On-State Voltage drop Vdrop=1.84V, Allowable Current Irms=15A, I"t=2.25A"? s) a) Calculate the DC output voltage Vout and output power Pd at ?=90°. [8Marks] b) What is the percentage voltage drop in Vout due to delay in firing switching device by ?=45°? [16Marks] c) What is the expected fuse allowable current Ia and clearing time tc to protect the Thyristors? [8Marks] d) With aid of diagram state possible location for the fuse in a converter in figure below? [16Marks] e) Draw both the input and output waveforms for the rectifier, for ?=30°. [4Marks] 2) A 110? DC load is connected to a peak supply of 240V through a fully controlled half wave rectifier. The load power is to be varied from 200W to 300W. What is the angular firing control range required? Neglect forward voltage drop of the Switching device. [20 Marks] 3) Design and draw an electric circuit diagram of converter used to supply a 1? AC variable speed Motor from a Photovoltaic Source. The circuit should consists of; 3?-1? Bridge cycloconverter and 3? Inverter. [20 Marks] 4) Name any four applications of cycloconverters. [8 Marks] Total [100Marks]
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Neglect voltage drop in thyristors. Thyristors Specifications (On-State Voltage drop Varop=1.84V,Allowable Current Irms=15A, I2t=2.25A2 s) Show more…
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Adi S.
In a three-phase four-wire distribution system with a three-phase VSI with a stepped wave AC line voltage output of 415 V (rms) at 50 Hz (quasi-square wave phase voltage), three single-phase loads (connected between phases and neutral) have a single-phase 230 V, 50 Hz thyristor bridge converter drawing equal 30 A constant DC current at 30° firing angle of its thyristors. A three-phase universal active power conditioner (consisting of a four-leg VSC as a shunt APF and a three-leg VSC as a series APF with a common bus capacitor as shown in Figure E11.15) is designed for this critical nonlinear load. Calculate (a) the voltage rating of the shunt element of the UAPC, (b) the current rating of the shunt element of the UAPC, (c) the VA rating of the shunt element of the UAPC, (d) the voltage rating of the series element of the UAPC, (e) the current rating of the series element of the UAPC, and (f) the VA rating of the series element of the UAPC to provide harmonic and reactive power compensation for unity power factor at the AC mains and zero neutral current by the shunt element of the UAPC and constant regulated sine wave voltage of 415 V (line rms) at 50 Hz across the load by the series element of the UAPC.
Madhur L.
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