A CONTROL STRATEGY TO ELIMINATE INJECTION OF DISTORTED CURRENTS INTO POWER GRID

This paper proposes a brand new control technique of doubly given induction machines (DFIGs) under unbalanced grid current conditions. The suggested controller features a model predictive direct power control (MPDPC) method along with a power compensation plan. In MPDPC, the right current vector is chosen based on an optimization cost function, therefore, the immediate active and reactive forces are controlled directly within the stator stationary reference frame without the advantages of coordinate transformation, PI government bodies, switching table, or PWM modulators. Additionally, the behavior from the DFIG under unbalanced grid current is investigated. Next, an electrical compensation plan with no need of removing negative stator current sequence is developed. An unbalanced three- phase system could be discomposed to 3 balanced symmetric three- phase system, i.e., the zero sequence, positive sequence, and negative sequence. The 3-phase system considered within this analysis is really a three-wire connection system without neutral point connection. By mixing the suggested MPDPC strategy and also the power compensation plan, altered power injected in to the power company through the DFIGs could be removed effectively. Consequently, apparent harmonic components are presented both in stator and rotor power