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This paper presents a shunt active power filter performances based on threelevel (NPC) inverter using conventional pulse width modulation (PWM) and Ann's controllers to mitigate current harmonics generated by non-linear loads. Shunt APF is the best solution to eliminate harmonics drawn from nonlinear load especially for low power system, the conventional scheme based on the two level inverter controlled by hysteresis controller presents several drawbacks such us high inverse voltage applied todoi:10.15676/ijeei.2014.6.1.15 fatcat:6kxn5eoqzbf4bnbbw3ng4peow4