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.