Let us work via an example below (ckt attached below). This example came from nptel lecture series (Lecture 13) by Professor Fernandes of Bombay University.
Problem Content: Triggering angle is maintained at 110 degrees. Current becomes zero at 50 degrees beyond the zero crossing of the positive half cycle. Sketch the load current and applied average voltage waveform. Find the average output voltage.
Givens: Iavg. = 1.8Adc, R = 6 ohm.
Notes from Professor:
<SCR, T1, is triggered at ωt=110° or 11π/18
<At ωt=230° or π+π/18 or 50° passed the zero crossing, current becomes zero.
<Remember, as long as SCR conducts, output voltage follows the input voltage.
<Output voltage follows the input voltage from ωt=110° to ωt=180°
<From ωt=180° to ωt=230° free-wheeling diodes are conducting. At ωt=180°^+, the potential of point B is higher than potential of point A. This means T1 turns off and D3 starts conducting. Until T4 is triggered, current free-wheels through D3 and D2.
<Output voltage from ωt=180° to ωt=230° is zero.
<At ωt=230° current dies down and reaches zero.
<From ωt=230° to ωt=110°+180°=290° output voltage is equal to E.
<<If we had an RLE load, output voltage would be zero and not E.
<Source current is same as the load current in the powering mode (T1 and D2 conduct) and when (D3 and T4 conduct).
<At ωt=180°^+, T1 turns off and if we assume source inductance to be zero, immediately source current becomes zero.
Going Back to My Initial Question:
Since load is not highly inductive, load current is discontinuous. This non-sinusoidal function may be approximated via Fourier Series representation? Likewise, because output voltage function is non-sinusoidal it, also, may be approximated via Fourier Series? Please correct me if I'm wrong.
Based on lecture, inductance on load side plays a huge, very important role. Is this true, or should I change the source of where I get my lectures? Please let me know.