It is strange dynaquest4 how some people want to show their lack of knowledge. I guess I am just here to help them .. probably would have been smart for them to find out how I spent a good part of my career. Oh well.
https://www.allaboutcircuits.com/technical-articles/understanding-thd-total-harmonic-distortion-in-p...
Read this article again. It proves you still have it totally wrong about THD.
Figure 1 shows a 60 Hz sine wave under a resistive load. The voltage swings from positive to negative and the current (i ac) tracks it. This has a power factor of one. That means you don’t waste any power. 100% of the power you put in can be used for "work". There is also no noise / harmonics being fed back to the grid so it won’t pollute the power grid with noise.
Figure 6 shows how a linear power supply works. It is a non-linear load. The 60 Hz voltage still goes up and down but the current
(i ac)
is drawn mostly at the peaks. This distorts the current and generates harmonics that are fed back into the grid (back to the plug).
Figure 7
Harmonics of current flowing into a linear power supply shows what the power looks like flowing in to the AC/DC converter. The harmonics you see were not in the original clean 60 Hz power supply but they were generated by the AC/DC converter and fed back to the grid polluting it. This caused a lot of distortion in the current and causes 280% THD. But (again) everything other than the 60 Hz signal is considered distortion and is not used for any work. The power factor for this AC/DC converter is only 0.33 showing the harmonics are just wasted power. Approximately 70% of the power you feed in is wasted and gets sent back to the grid as harmonics polluting the rest of your (and your neighbors) power.
If you have too many non linear loads on a grid this distortion can be a big problem to other electronics (look it up). One thing they can do is make transformers buzz and overheat. This distortion is what you want to filter out by using a power cord. Or even better a power conditioner that removes the harmonics and feeds your system a clean 60 Hz sine wave.
