Blackstart of an induction motor in an autonomous microgrid

Starting of large induction motors may produce voltage dip in a weak microgrid because of high current and reactive power demand in transient period. This paper develops a solution for black start issue of an Induction Motor (IM) using Voltage-Sourced Converter (VSC) interfaced source in an autonomous microgrid. This paper provides procedures and techniques for controlling the VSC. First, a dynamic model of a microgrid is analyzed to provide a designing criteria of VSC´s controller. Vector control is implemented to control the voltage and frequency of the VSC at autonomous mode. Second, the issue of black start of IM is investigated and analyzed. A proposed technique is presented in order to solve the overcurrent and voltage dip due to black start of IM. Finally, a microgrid is modeled and simulated in PSCAD/EMTDC to validate the proposed technique on black start.