In this paper, modeling of one type of grid
connected single phase inverter commercially available in
Thailand is carried out. An inverter of a grid-connected
photovoltaic system has been tested and its model determined.
The inverter operates in six steady state conditions and its
modeling is done using nonlinear system identification
approach with Hammerstein Wiener Model. The models with
no cross validation and cross validation data of six steady state
conditions have been experimented. The results comparison on
modeling by using cross validation and no cross validation data
has been analyzed by model order, model accuracies and
model error. The average percentage accuracy of system
identification with cross validation data and no cross
validation is 81.89 and 63.83 respectively