Power Electronics: SPWM Inverter

Discussion in 'The Projects Forum' started by gemini1989, May 19, 2012.

  1. gemini1989

    Thread Starter New Member

    May 19, 2012
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    0
    Recently i had done a project of single phase inverter. I found that when the output load is increasing, the voltage THD is increasing. What is the reason behind? My inverter is 120W, load is R=20 Ohm to 60 Ohm. Input DC voltage around 40V. The resistive load used is not purely resistive but contain some inductance since it is a high current rheostat with winding construction and moving slider. But it can be consider as linear load.
    Question:
    1. I found that when the output load is increasing, voltage regulation improve and the voltage THD is increasing. What is the reason behind?

    2.My load increase, current reduced, but current THD increase. What is the reason behind?
     
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