Modeling and design of photovoltaic inverters for island mode operation within a microgrid

This paper presents the Modeling, design and implementation of single phase inverters for operation in island mode within a microgrid. Photovoltaic inverter model is obtained in small signal, and its calculation will allow to obtain the transfer functions of different control loops. In island mode operation, it is important that several inverters can be connected in parallel, having for these different control strategies. With the purpose of achieve this objective; a control configuration is implemented having as reference the output voltage of droop scheme. This controller is proportional integral-proportional controller plus resonant controller. With this control configuration is intended maintain the amplitude, waveform and frequency of the inverter output voltage and attend increases linear and nonlinear load in island mode operation of a single phase inverter.