Source Inverter Voltage and Frequency Control for AC Isolated Microgrid Applications

A novel control strategy is proposed in this paper, which implements a Hierarchical Control (HC) and Space Vector Pulse Width Modulation (SVPWM). The paper outline includes the method design and its micro-grid performance, which has three parallel-connected inverters. Thus, the HC implements inner, primary, and secondary control. The first, inner control loop, regulates the inverter output voltage using the stationary reference frame. On one hand, the primary control implements the universal droop control, which is in charge of active and reactive power share between inverters. On the other hand, the secondary control restores the voltage and frequency deviations because of the primary control. Finally, the results validate the advantages strategy in power inverters. The proposed control scheme effectiveness has an excellent performance, as it applied in micro-grids in the event of abrupt changes or parameter variations.