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nonlinear loads can be classified in to three categories. the first is voltage stiff loads such as diode rectifier with capacitive filter at DC link feeding VSI-based AC motor drive, computer's power supplies etc. these loads draw nonsinusoidal currents from grid. the second category is current stiff loads such as thyristor-converter-fed DC motor drives or CSI based AC drives or HVDC systems. the third category is a mix of these two type. neither stiff voltage nor stiff current.
Dear eagle1989
Hi
It is simple ! a diode can be considered as a non linear load . or an inductor , or a capacitor too . also a resistor in some range of frequencies can be a nonlinear element !
On the other hands when your load can't follow from the function Y=(x) . it means it is non linear .
Best Wishes
Goldsmith
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