Effect of photovoltaic generator on a typical VSI-based three-phase grid-connected photovoltaic inverter dynamics

The input source whether voltage or current type determines the dynamics of a converter. A common practice in the VSI-based inverter analysis is the assumption of a constant voltage type input source even in case of renewable energy sources. An input-voltage-controlled converter, as usually in PV applications, is always a current-fed topology. This paper reveals that in order to analyse the dynamic properties of three-phase inverters with scientific accuracy, the true nature of the input source is of utmost importance to be taken into account.