Formal grid integration of photovoltaic and wind power using the model reference control approach

In this paper, a model-reference control scheme for nonlinear systems in the Takagi-Sugeno form is proposed for formal grid integration of photovoltaic and wind power. Formal in terms of a structural model-based design of grid-integrated wind and photovoltaic systems as demand-oriented power sources. The proposed scheme is applied to a generic Type-4 wind turbine for the partial and full-load region and a photovoltaic power plant with two stages separated into an aggregated PV array and a DC/DC converter. Using the wind turbine as an example, the coefficients of the model controller are calculated using a set of proposed LMI conditions. The design process is described in detail, including a controller performance test under different wind speed conditions.