Dynamic performance analysis of DC microgrid with a proposed control strategy for single-phase VCVSI

This paper presents the dynamic performance analysis of a “dc microgrid”, under islanded mode, considering the impact of dc cable drops, and a control strategy developed for the single-phase Voltage Controlled Voltage Source Inverter (VCVSI) under various operating scenarios. The DC Microgrid (DCMG) consists of wind turbine, solar photo-voltaic, fuel cell, Distributed Generations (DGs), battery energy storage system, and various dc and ac loads. The dc cable has been used for connecting each of the DGs and loads to the DCMG. The control strategy of single-phase VCVSI, using the combination of “feedback” and “feed-forward” control loops, has been suggested and implemented in d-q rotating reference frame. The developed control scheme has been used to connect single-phase ac loads to the DCMG, which maintains desired sinusoidal load-voltage waveform with low total harmonic voltage distortion and required power flow from the DCMG to single-phase ac loads.