A new method for the photovoltaic grid-connected inverter control

Conventional photovoltaic grid-connected using PI current loop control, there are some shortcomings: low precision control system, on the system parameters perturbation robustness is not strong, rapid, no static error, and strong anti-disturbance load capacity is limited and so on. In order to improve the dynamic performance of the grid-connected PV inverter control system, reduce the hardware and software cost of inverter control design, in view of grid-connected inverter non-linear mathematical model, this paper proposes the design of grid-connected inverter control system using the Exponential Sliding Mode Control. Theory testify of the Exponential Sliding Mode Approach Law applied in the grid-connected inverter is completed, and system stability was proven using Lyapunov theorem. The unit continuous of control method is used to solve the buffeting. Compared with the conventional control system, the result of the proposed control strategy had proven accurate, and the system has a good control precision and followed characteristic. Finally, the THD Harmonic Analysis is completed, proved the validity of the theory.