Strategy analysis of photovoltaic grid based on input-output feedback linearization

For the instabilities and nonlinear problems of photovoltaic (PV) system, this paper proposes a new control strategy basing on the state-space description of PV. The nonlinear PV system is decomposed into two equivalent linear system which makes DC voltage and AC-side power factor decoupled through using the technology of input-output feedback linearization. Pole placement technique is used for making closed-loop system pole placed in the desired location so that the satisfied quality and stability of the dynamic can be got. In addition, improved incremental conductance used for the maximum power point tracking so that system has a good dynamic and steady-state performance in accordance with the requirements of grid-connected PV system.