Grid-Connected of Photovoltaic Module Using Inverse Optimal Control

Abstract

Switching converters and photovoltaic panels are nonlinear models, but existing PV inverter control methods are mostly based on the linearization control methods. The traditional linear methods are often difficult to eliminate static errors and the dynamic responses are not very satisfactory. In this paper, on the basis of nonlinear methods to control the switching converter, a mathematical model of discrete rotating coordinate system is given and an inverse optimal control method for single-phase grid-connected inverter control is proposed at the same time. This method achieved independent power control purposes due to implementing active and reactive power decomposition; and it is easier to use a microcontroller digital implementation for the discrete method. Simulation results show that this method can eliminate the static errors, and have a good dynamic response.