Intentional islanded operation of converter fed microgrids

This paper develops a dynamic model of a converter fed islanded microgrid and proposes a control scheme to regulate its voltage and frequency. The model, which is formulated in an instantaneously synchronized reference frame, shows that the microgrid voltage depends on the real power balance between the converter and the load while reactive power balance determines the frequency. These results are used to synthesize a microgrid voltage and frequency control scheme that allow converters with standard inductor interface and dq frame current control to operate in intentional islanding model without using a frequency generator in the controller