Active Cancelation of Equivalent Grid Impedance for Improving Stability and Injected Power Quality of Grid-Connected Inverter Under Variable Grid Condition

An active grid impedance cancelator using the concept of series active filter to suppress the effect of the grid disturbance and stabilize the single-phase grid-connected inverters with an inductive-capacitive-inductive filter operating under variable grid condition is presented. Harmonic interaction between the inverter and the grid is thereby avoided owing to the cancelation of equivalent grid i...