Control Strategy and Stability Assessment of Microgrid-based Flexible Loads

As a kind of flexible load with bi-directional energy interaction, microgrid (MG) can deliver power when power converters operate in grid-feeding mode. Grid-feeding inverters can be controlled as a current source. This paper analyses the control strategy of grid-feeding power converters in an MG, develops an impedance model of the system with multiple parallel current-source-based inverters(VSIs). Further, an impedance reshaping approach is proposed to enhance the stability of MGs as flexible loads. The approach is validated by simulation results.