High performance decoupled active and reactive power control for three-phase grid-tied inverters using model predictive control

Abstract Finite control set-model predictive (FCS-MPC) is employed in this paper to the operation of a three-phase grid-connected string inverter based on direct PQ scheme. The main objective achieve high-performance decoupled active and reactive powers injected grid from distributed energy resources (DER). FCS-MPC scheme instantaneously searches for applies optimum switching state that can certain goals, such as minimum deviation between reference actual power; so both power components (P Q) are well controlled their values. In addition, an effective method attenuate undesired cross coupling P Q loops, which occurs only during transient operation, investigated. proposed variation weight factors terms cost function, higher factor assigned function term exposed greater disturbance. Empirical formulae functions signals mathematically derived. investigated incorporated with LVRT support voltage fulfilling accomplishing up-to-date codes. algorithm modification references instantaneous suitable values sag. performance elaborated studied under various operating scenarios, including steady-state conditions. Results demonstrate validity effectiveness regard achievement quick response grid-tied inverters normal fault modes.