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This paper presents the three – level neutral point diode clamped inverter is used in a distribution static compensator (DSTATCOM), making use of the multi advantages of low harmonics distortion and reduced switching losses. The pulse width modulation (PWM) inverter is employed as DSTATCOM compensating reactive power and eliminates the harmonics drawn from a non-linear load. A fuzzy gain scheduled proportional and integral (FGPI) dc voltage proposed for inverter dc voltage control to improve the performances of three – levels DSTATCOM and fuzzy logic current controller is proposed to reduce harmonic supply currents for DSTATCOM. The D-Q reference frame theory is generate the reference compensating currents for three DSTATCOM. The three-level DSTATCOM with control schemes is implemented in Matlab/Simulink platform. The simulation results show that the system with proposed control schemes provides a good inverter dc voltage regulation, reduced harmonics distortion in supply current and in phase with line voltage.

Neutral Point Diode Clamped Multi-Level Control of Dstatcom by Using Fuzzy Gain Scheduling PI and Fuzzy Logic Controllers