Voltage and frequency regulation in high power AC islanded microgrid with static converter interfaced generators

Abstract

In this paper a conservative approach to build a Power Electronic Power Distribution System (PEPDS) has been used, introducing into an existing islanded AC system a Static Converter Interfaced Generator (SCIG). The paper tries to assess the power quality issues (in terms of v/f regulation) that can possibly arise when integrating conventional mechanical-based generators with new ones in an islanded power system, using a mathematical modelling approach. Two different phase regulators for the SCIG output voltage vector have been evaluated and compared, depending on the operative requirements of the SCIG prime mover (frequency regulation or fixed power injection). Finally, a set of simulations has been performed to assess the effect of the SCIG grid-side regulators parametric variations on the system's v/f regulation performance.