Event Management Layer for Distributed Generation Photovoltaic Inverters

This paper proposes a multi layer management approach for power inverter control of grid connected photovoltaic systems. Initially, an event management model is derived from the photovoltaic inverter unit, in which the set of uncontrollable events is accounted for as perturbed terms added to the controllable nominal set model. Then, a discrete-event approach design procedure that guarantees the PV system stability under irradiance solar uncertainties and disturbances at the grid side is presented in detail. It is demonstrated that a very fast dynamic behavior can be obtained with the proposed inverter management layer, which improves the transient response of the grid connected PV system, especially under conditions of fast changes of the solar irradiance and voltage dips resulting from network faults, which can be helpful to match the new grid codes. Experimental results in Hardware-in-the-loop are given to support the theoretical analysis and to illustrate the performance of grid connected PV inverter with the proposed management approach.